Add 3d-files for case

Add arrow keys and move F-keys

.cargo/config

@@ -1,35 +0,0 @@
-#
-# Cargo Configuration for the https://github.com/rp-rs/rp-hal.git repository.
-#
-# Copyright (c) The RP-RS Developers, 2021
-#
-# You might want to make a similar file in your own repository if you are
-# writing programs for Raspberry Silicon microcontrollers.
-#
-# This file is MIT or Apache-2.0 as per the repository README.md file
-#
-
-[build]
-# Set the default target to match the Cortex-M0+ in the RP2040
-target = "thumbv6m-none-eabi"
-
-# Target specific options
-[target.thumbv6m-none-eabi]
-# Pass some extra options to rustc, some of which get passed on to the linker.
-#
-# * inline-threshold=5 makes the compiler more aggressive and inlining functions
-# * no-vectorize-loops turns off the loop vectorizer (seeing as the M0+ doesn't
-#   have SIMD)
-rustflags = [
-    "-C", "linker=flip-link",
-    "-C", "inline-threshold=5",
-    "-C", "no-vectorize-loops",
-]
-
-# This runner will make a UF2 file and then copy it to a mounted RP2040 in USB
-# Bootloader mode:
-runner = "elf2uf2-rs -d"
-
-# This runner will find a supported SWD debug probe and flash your RP2040 over
-# SWD:
-# runner = "probe-run --chip RP2040"

.cargo/config.toml

@@ -0,0 +1,12 @@
+[build]
+#target = "thumbv6m-none-eabi"
+
+[target.thumbv6m-none-eabi]
+rustflags = [
+    "-C", "linker=flip-link",
+    "-C", "inline-threshold=5", # inline functions more aggressively
+    "-C", "no-vectorize-loops",
+]
+
+#runner = "elf2uf2-rs -d"
+runner = "probe-rs run --chip RP2040"

.gitignore

@@ -1 +1,2 @@
-/target
+target
+*.pc

Cargo.toml

@@ -1,41 +1,10 @@
-[package]
+[workspace]
-name = "tangentbord1"
+members = [
-version = "0.1.0"
+    "lib",
-authors = ["Joakim Hulthe <joakim@hulthe.net>"]
+    "left",
-description = "Keyboard firmware"
+    "right",
-edition = "2021"
+    "editor",
+]
 
-[dependencies]
+resolver = "2"
-tgnt = { git = "https://git.nubo.sh/hulthe/tgnt.git", default-features = false }
-cortex-m = "0.7.6"
-cortex-m-rt = "0.7"
-embedded-hal = "0.2.5"
-#panic-halt = "0.2.0"
-usb-device = "0.2.9"
-usbd-hid = "0.6.1"
-static_cell = "1.0.0"
-embedded-io = { version = "*", features = ["async"] }
-futures = { version = "0.3", default-features = false }
-embassy-executor = { git = "https://github.com/embassy-rs/embassy.git", features = ["log", "nightly", "integrated-timers" ] }
-embassy-sync = { git = "https://github.com/embassy-rs/embassy.git", features = ["log", "nightly"] }
-embassy-time = { git = "https://github.com/embassy-rs/embassy.git", features = ["log"] }
-embassy-futures = { git = "https://github.com/embassy-rs/embassy.git", features = ["log"] }
-embassy-usb = { git = "https://github.com/embassy-rs/embassy.git", features = ["usbd-hid"] }
-embassy-usb-logger = { git = "https://github.com/embassy-rs/embassy.git", features = [] }
-embassy-usb-driver = { git = "https://github.com/embassy-rs/embassy.git", features = [] }
-embassy-rp = { git = "https://github.com/embassy-rs/embassy.git", features = ["log", "nightly", "unstable-traits", "unstable-pac", "time-driver", "pio", "critical-section-impl"] }
-log = "0.4.17"
-pio = "0.2.1"
-pio-proc = "0.2.1"
-smart-leds = "0.3.0"
-embedded-alloc = "0.5.0"
-postcard = { version = "1.0.4", features = ["alloc"] }
 
-[build-dependencies]
-tgnt = { git = "https://git.nubo.sh/hulthe/tgnt.git", default-features = false }
-ron = "0.8.0"
-postcard = { version = "1", features = ["use-std"] }
-
-[features]
-default = ["n-key-rollover"]
-n-key-rollover=[]

editor/.gitignore

@@ -0,0 +1,2 @@
+/target
+/Cargo.lock

editor/Cargo.toml

@@ -0,0 +1,22 @@
+[package]
+name = "editor"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies.tangentbord1]
+path = "../lib"
+package = "tangentbord1-lib"
+features = ["std"]
+
+[dependencies]
+clap = { version = "4.5.1", features = ["derive"] }
+eframe = { version = "0.26.2", features = ["persistence", "ron", "serde"] }
+egui = { version = "0.26.2", features = ["persistence", "ron", "serde"] }
+egui_extras = { version = "0.26.2" }
+msgpck = { version = "0.2.8", features = ["alloc"] }
+eyre = "0.6.12"
+log = "0.4.20"
+pretty_env_logger = "0.5.0"
+ron = { version = "0.8.0" }
+serde = { version = "1.0.156", features = ["derive"] }
+tokio = { version = "1.36.0", features = ["full"] }

editor/README.md

@@ -0,0 +1,3 @@
+# tgnt
+
+Keyboard configuration library and editor.

editor/src/default_layer.ron

@@ -0,0 +1,25 @@
+Layer(
+	buttons: [
+		Keycode(0x04),
+		Keycode(0x05),
+		Keycode(0x06),
+		Keycode(0x07),
+		Keycode(0x08),
+
+		Keycode(0x09),
+		Keycode(0x0A),
+		Keycode(0x0B),
+		Keycode(0x0C),
+		Keycode(0x0D),
+
+		Keycode(0x0E),
+		Keycode(0x0F),
+		Keycode(0x10),
+		Keycode(0x11),
+		ModTap( keycode: 0x12, modifier: LMod),
+
+		Modifier(LShift),
+		Modifier(LCtrl),
+		NextLayer,
+	],
+)

editor/src/default_layout.ron

@@ -0,0 +1,25 @@
+Layout(
+	buttons: [
+		(x: 0.0, y: 0.4),
+		(x: 1.0, y: 0.2),
+		(x: 2.0, y: 0.0),
+		(x: 3.0, y: 0.2),
+		(x: 4.0, y: 0.4),
+
+		(x: 0.0, y: 1.4),
+		(x: 1.0, y: 1.2),
+		(x: 2.0, y: 1.0),
+		(x: 3.0, y: 1.2),
+		(x: 4.0, y: 1.4),
+
+		(x: 0.0, y: 2.4),
+		(x: 1.0, y: 2.2),
+		(x: 2.0, y: 2.0),
+		(x: 3.0, y: 2.2),
+		(x: 4.0, y: 2.4),
+
+		(x: 3.0, y: 3.2),
+		(x: 4.0, y: 3.4),
+		(x: 5.0, y: 3.6),
+	]
+)

editor/src/main.rs

@@ -0,0 +1,395 @@
+mod mat;
+mod serial;
+
+use clap::Parser;
+use egui::{Button, Color32, Frame, Rect, ScrollArea, Slider, TextEdit, Vec2};
+use eyre::eyre;
+use mat::Mat;
+use serde::{Deserialize, Serialize};
+use serial::{connect_to_serial, scan_for_serial};
+use std::{collections::VecDeque, path::PathBuf};
+use tangentbord1::{
+    layer::Layer,
+    layout::Layout,
+    serial_proto::owned::{ChangeLayer, DeviceMsg, LogRecord},
+};
+use tokio::{
+    runtime::Runtime,
+    sync::{
+        mpsc::{self, Receiver},
+        oneshot::{self, error::TryRecvError},
+    },
+    task::spawn_blocking,
+};
+
+#[derive(Parser)]
+struct Opt {
+    /// Path to device serial port
+    device: Option<PathBuf>,
+}
+
+fn main() -> eyre::Result<()> {
+    let _opt = Opt::parse();
+
+    pretty_env_logger::init();
+
+    let rt = Runtime::new().unwrap();
+    let _enter_rt = rt.enter();
+
+    log::info!("starting application");
+    let native_options = eframe::NativeOptions::default();
+    eframe::run_native(
+        "tgnt keyboard editor",
+        native_options,
+        Box::new(|cc| Box::new(App::new(cc))),
+    )
+    .map_err(|e| eyre!("Failed to run program: {e:?}"))?;
+
+    rt.shutdown_background();
+
+    Ok(())
+}
+
+/// We derive Deserialize/Serialize so we can persist app state on shutdown.
+#[derive(Deserialize, Serialize)]
+#[serde(default)] // if we add new fields, give them default values when deserializing old state
+pub struct App {
+    layout: RonEdit<Layout>,
+
+    layers: Mat<RonEdit<Layer>>,
+
+    u1: f32,
+    margin: f32,
+
+    #[serde(skip)]
+    serial: SerialState,
+}
+
+struct SerialState {
+    scan_task: Option<oneshot::Receiver<Result<Option<PathBuf>, String>>>,
+    dev: Result<Option<PathBuf>, String>,
+    reader: Option<Receiver<DeviceMsg>>,
+    logs: VecDeque<LogRecord>,
+    active_layer: Option<(u16, u16)>,
+}
+
+#[derive(Deserialize, Serialize, Clone)]
+struct RonEdit<T> {
+    pub t: T,
+    pub ron: String,
+    pub error: String,
+}
+
+impl<T: Serialize> RonEdit<T> {
+    pub fn new(t: T) -> Self {
+        RonEdit {
+            ron: ron::ser::to_string_pretty(&t, Default::default()).unwrap(),
+            error: String::new(),
+            t,
+        }
+    }
+}
+
+impl<T: Default + Serialize> Default for RonEdit<T> {
+    fn default() -> Self {
+        RonEdit::new(Default::default())
+    }
+}
+
+impl Default for App {
+    fn default() -> Self {
+        Self {
+            layers: Default::default(),
+            layout: Default::default(),
+            u1: 75.0,
+            margin: 0.05,
+
+            serial: Default::default(),
+        }
+    }
+}
+
+impl Default for SerialState {
+    fn default() -> Self {
+        Self {
+            scan_task: Default::default(),
+            dev: Ok(None),
+            reader: Default::default(),
+            logs: Default::default(),
+            active_layer: None,
+        }
+    }
+}
+
+impl App {
+    /// Called once before the first frame.
+    pub fn new(cc: &eframe::CreationContext<'_>) -> Self {
+        // This is also where you can customize the look and feel of egui using
+        // `cc.egui_ctx.set_visuals` and `cc.egui_ctx.set_fonts`.
+
+        // Load previous app state (if any).
+        // Note that you must enable the `persistence` feature for this to work.
+        if let Some(storage) = cc.storage {
+            return eframe::get_value(storage, eframe::APP_KEY).unwrap_or_default();
+        }
+
+        let layer_str = include_str!("default_layer.ron");
+        let layer: Layer = ron::from_str(&layer_str).expect("Failed to deserialize default layer");
+
+        let layout_str = include_str!("default_layout.ron");
+        let layout: Layout =
+            ron::from_str(&layout_str).expect("Failed to deserialize default layout");
+
+        let mut layers = Mat::default();
+        layers.push_row(RonEdit::new(layer));
+
+        Self {
+            layers,
+            layout: RonEdit::new(layout),
+            ..Self::default()
+        }
+    }
+}
+
+impl eframe::App for App {
+    /// Called by the frame work to save state before shutdown.
+    fn save(&mut self, storage: &mut dyn eframe::Storage) {
+        eframe::set_value(storage, eframe::APP_KEY, self);
+    }
+
+    /// Called each time the UI needs repainting, which may be many times per second.
+    /// Put your widgets into a `SidePanel`, `TopPanel`, `CentralPanel`, `Window` or `Area`.
+    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
+        let Self {
+            margin,
+            u1,
+            layout,
+            layers,
+            serial:
+                SerialState {
+                    scan_task: scan_serial_task,
+                    dev: serial_devs,
+                    reader: serial_reader,
+                    logs: serial_logs,
+                    active_layer,
+                },
+        } = self;
+
+        while let Some(rx) = scan_serial_task {
+            match rx.try_recv() {
+                Ok(r) => {
+                    *serial_devs = r;
+                    *scan_serial_task = None;
+                }
+                Err(TryRecvError::Empty) => break,
+                Err(TryRecvError::Closed) => {
+                    *scan_serial_task = None;
+                    break;
+                }
+            }
+        }
+
+        while let Some(rx) = serial_reader {
+            match rx.try_recv() {
+                Ok(DeviceMsg::Log(record)) => {
+                    serial_logs.push_back(record);
+                    if serial_logs.len() > 10 {
+                        serial_logs.pop_front();
+                    }
+                }
+                Ok(DeviceMsg::ChangeLayer(ChangeLayer { x, y })) => {
+                    *active_layer = Some((x, y));
+                }
+                Ok(_) => {}
+                Err(mpsc::error::TryRecvError::Empty) => break,
+                Err(mpsc::error::TryRecvError::Disconnected) => {
+                    *serial_reader = None;
+                    break;
+                }
+            }
+        }
+
+        #[cfg(not(target_arch = "wasm32"))] // no File->Quit on web pages!
+        egui::TopBottomPanel::top("top_panel").show(ctx, |ui| {
+            // The top panel is often a good place for a menu bar:
+            egui::menu::bar(ui, |ui| {
+                ui.menu_button("File", |ui| {
+                    if ui.button("Quit").clicked() {
+                        todo!("implement quit")
+                    }
+                });
+            });
+        });
+
+        egui::SidePanel::left("side_panel")
+            .resizable(true)
+            .width_range(250.0..=500.0)
+            .show(ctx, |ui| {
+                ScrollArea::vertical().show(ui, |ui| {
+                    ui.heading("Side Panel");
+
+                    ui.collapsing("Serial", |ui| {
+                        match serial_devs {
+                            Ok(Some(dev)) => {
+                                if serial_reader.is_none()
+                                    && ui.button(format!("Connect to {dev:?}")).clicked()
+                                {
+                                    *serial_reader =
+                                        Some(connect_to_serial(dev.clone(), ctx.clone()));
+                                };
+                            }
+                            Ok(None) => {
+                                ui.label("No devices found.");
+                            }
+                            Err(e) => {
+                                ui.code_editor(e);
+                            }
+                        }
+
+                        if ui.button("scan for serial device").clicked()
+                            && scan_serial_task.is_none()
+                        {
+                            let (tx, rx) = oneshot::channel();
+                            let ctx = ctx.clone();
+                            spawn_blocking(move || {
+                                let r = scan_for_serial().map_err(|e| e.to_string());
+                                let _ = tx.send(r);
+                                ctx.request_repaint();
+                            });
+
+                            *scan_serial_task = Some(rx);
+                        }
+
+                        if scan_serial_task.is_some() {
+                            ui.label("Scanning...");
+                        }
+
+                        ScrollArea::both().show(ui, |ui| {
+                            for log in &*serial_logs {
+                                ui.group(|ui| {
+                                    ui.horizontal(|ui| {
+                                        ui.label(&log.level);
+                                        ui.label(&log.message);
+                                    });
+                                });
+                            }
+                        })
+                    });
+
+                    ui.label("u1");
+                    ui.add(Slider::new(u1, 20.0..=150.0));
+                    ui.label("margin");
+                    ui.add(Slider::new(margin, 0.0..=0.4));
+
+                    ui.collapsing("Layout", |ui| {
+                        if ui
+                            .add(TextEdit::multiline(&mut layout.ron).code_editor())
+                            .changed()
+                        {
+                            layout.error.clear();
+                            match ron::from_str(&layout.ron) {
+                                Ok(new) => layout.t = new,
+                                Err(e) => layout.error = e.to_string(),
+                            }
+                        }
+
+                        if !layout.error.is_empty() {
+                            ui.add(
+                                TextEdit::multiline(&mut layout.error)
+                                    .interactive(false)
+                                    .text_color(Color32::RED),
+                            );
+                        }
+                    });
+
+                    for x in 0..layers.width() {
+                        for y in 0..layers.height() {
+                            let layer = layers.get_mut(x, y).unwrap();
+                            ui.collapsing(format!("Layer {x},{y}"), |ui| {
+                                if ui
+                                    .add(TextEdit::multiline(&mut layer.ron).code_editor())
+                                    .changed()
+                                {
+                                    layer.error.clear();
+                                    match ron::from_str(&layer.ron) {
+                                        Ok(new) => layer.t = new,
+                                        Err(e) => layer.error = e.to_string(),
+                                    }
+                                }
+
+                                if !layer.error.is_empty() {
+                                    ui.add(
+                                        TextEdit::multiline(&mut layer.error)
+                                            .interactive(false)
+                                            .text_color(Color32::RED),
+                                    );
+                                }
+                            });
+                        }
+                    }
+
+                    if ui.button("Add layer row").clicked() {
+                        layers.push_row(RonEdit::default());
+                    }
+
+                    ui.menu_button("Delete layer row", |ui| {
+                        for r in 0..layers.height() {
+                            if ui.button(format!("row {r}")).clicked() {
+                                layers.remove_row(r);
+                            }
+                        }
+                    });
+
+                    if ui.button("Add layer column").clicked() {
+                        layers.push_col(RonEdit::default());
+                    }
+
+                    ui.menu_button("Delete layer column", |ui| {
+                        for c in 0..layers.width() {
+                            if ui.button(format!("column {c}")).clicked() {
+                                layers.remove_col(c);
+                            }
+                        }
+                    });
+                });
+            });
+
+        egui::CentralPanel::default().show(ctx, |ui| {
+            ScrollArea::both().show(ui, |ui| {
+                for (i, layer) in layers.iter_cf().enumerate() {
+                    let x = (i / layers.height()) as u16;
+                    let y = (i % layers.height()) as u16;
+
+                    if Some((x, y)) == *active_layer {
+                        ui.visuals_mut().widgets.inactive.bg_stroke =
+                            (1.0, Color32::DARK_GREEN).into();
+                    }
+
+                    Frame::none().show(ui, |ui| {
+                        for (i, geometry) in layout.t.buttons.iter().enumerate() {
+                            let margin = *margin * *u1;
+                            let size = Vec2::new(
+                                *u1 * geometry.w - margin * 2.0,
+                                *u1 * geometry.h - margin * 2.0,
+                            );
+                            let offset =
+                                Vec2::new(*u1 * geometry.x + margin, *u1 * geometry.y + margin);
+                            let rect = Rect::from_min_size(ui.min_rect().min + offset, size);
+
+                            let button = if let Some(button) = layer.t.buttons.get(i) {
+                                Button::new(button.to_string())
+                            } else {
+                                Button::new("")
+                            };
+
+                            ui.put(rect, button);
+                        }
+                    });
+
+                    ui.visuals_mut().widgets = Default::default();
+                    ui.separator();
+                }
+            })
+        });
+    }
+}

editor/src/mat.rs

@@ -0,0 +1,98 @@
+use serde::{Deserialize, Serialize};
+
+/// 2-dimensional dynamically sized matrix
+#[derive(Default, Deserialize, Serialize)]
+pub struct Mat<T> {
+    rows: Vec<Vec<T>>,
+}
+
+#[allow(dead_code)]
+impl<T> Mat<T> {
+    /// Iterater over entries, rows first.
+    pub fn iter_rf(&self) -> impl Iterator<Item = &T> {
+        todo!();
+        #[allow(unreachable_code)]
+        [].into_iter()
+    }
+
+    /// Iterater over entries, columns first.
+    pub fn iter_cf(&self) -> impl Iterator<Item = &T> {
+        let height = self.height();
+        (0..self.width())
+            .flat_map(move |x| (0..height).map(move |y| (x, y)))
+            .map(|(x, y)| &self.rows[y][x])
+    }
+
+    pub fn get_mut(&mut self, x: usize, y: usize) -> Option<&mut T> {
+        if x >= self.width() || y >= self.height() {
+            return None;
+        }
+
+        Some(&mut self.rows[y][x])
+    }
+
+    /// Get the width & height of the matrix
+    pub fn height(&self) -> usize {
+        self.rows.len()
+    }
+
+    /// Get the width & height of the matrix
+    pub fn width(&self) -> usize {
+        self.rows.get(0).map(|row| row.len()).unwrap_or(0)
+    }
+
+    /// Get the width & height of the matrix
+    pub fn size(&self) -> (usize, usize) {
+        (self.width(), self.height())
+    }
+
+    pub fn push_row(&mut self, t: T)
+    where
+        T: Clone,
+    {
+        let width = self.width();
+        if width == 0 {
+            self.rows.push(vec![t]);
+        } else {
+            self.rows.push(vec![t; width])
+        }
+    }
+
+    pub fn push_col(&mut self, t: T)
+    where
+        T: Clone,
+    {
+        let height = self.height();
+        if height == 0 {
+            self.rows.push(vec![t]);
+        } else {
+            self.rows.iter_mut().for_each(|row| row.push(t.clone()));
+        }
+    }
+
+    pub fn remove_row(&mut self, y: usize) {
+        if y >= self.height() {
+            panic!("row {y} out of matrix bounds");
+        }
+
+        if self.height() == 1 {
+            self.rows.clear();
+        } else {
+            self.rows.remove(y);
+        }
+    }
+
+    pub fn remove_col(&mut self, x: usize) {
+        if x >= self.width() {
+            panic!("col {x} out of matrix bounds");
+        }
+
+        if self.width() == 1 {
+            self.rows.clear();
+        } else {
+            for row in self.rows.iter_mut() {
+                row.remove(x);
+            }
+        }
+    }
+}

editor/src/serial.rs

@@ -0,0 +1,5 @@
+mod port;
+mod scan;
+
+pub use port::connect_to_serial;
+pub use scan::scan_for_serial;

editor/src/serial/port.rs

@@ -0,0 +1,144 @@
+use std::{future::pending, path::PathBuf, time::Duration};
+
+use egui::Context;
+use eyre::{bail, Context as EyreContext};
+use msgpck::{MsgPack, MsgUnpack, UnpackErr};
+use tangentbord1::serial_proto::owned::{DeviceMsg, HostMsg};
+use tokio::{
+    fs::File,
+    io::{AsyncReadExt, AsyncWriteExt},
+    process::Command,
+    select,
+    sync::mpsc::{self, Receiver, Sender},
+    time::{sleep, Instant},
+};
+
+const MAX_MESSAGE_SIZE: usize = 16 * 1024;
+const MESSAGE_TIMEOUT: Duration = Duration::from_millis(30);
+
+pub fn connect_to_serial(dev: PathBuf, ctx: Context) -> Receiver<DeviceMsg> {
+    let (tx, rx) = mpsc::channel(12);
+    tokio::spawn(async {
+        if let Err(e) = read_serial(dev, tx, ctx).await {
+            log::error!("serial read task exited with error: {e:#?}");
+        }
+    });
+    rx
+}
+
+async fn read_serial(dev: PathBuf, tx: Sender<DeviceMsg>, ctx: Context) -> eyre::Result<()> {
+    log::debug!("configuring keyboard serial device");
+    let out = Command::new("stty")
+        .arg("-F")
+        .arg(&dev)
+        .args(["115200", "raw", "-clocal", "-echo"])
+        .output()
+        .await
+        .wrap_err("failed to configure serial device, couldn't execute stty")?;
+
+    if !out.status.success() {
+        bail!("failed to configure serial device");
+    }
+
+    log::debug!("opening keyboard serial device");
+    let mut file = File::options()
+        .create(false)
+        .read(true)
+        .append(true)
+        .open(dev)
+        .await?;
+
+    log::debug!("requesting keyboard layers");
+    for p in HostMsg::GetLayers.pack() {
+        log::debug!("packing {:x?}", p);
+        file.write_all(p.as_bytes()).await?;
+    }
+
+    let mut buf = Vec::with_capacity(MAX_MESSAGE_SIZE);
+    let mut last_read = Instant::now();
+
+    loop {
+        // if buffer is not empty, this future will sleep until the pending message times out
+        let timeout = async {
+            if buf.is_empty() {
+                pending().await
+            } else {
+                let timeout_at = last_read + MESSAGE_TIMEOUT;
+                sleep(Instant::now() - timeout_at).await;
+            }
+        };
+
+        // try to read some bytes from the file
+        let mut tmp = [0u8; 1024];
+        let n = select! {
+            n = file.read(&mut tmp) => n?,
+
+            // need to continuously poll read if nothing is happening
+            _ = sleep(Duration::from_millis(20)) => continue,
+
+            _ = timeout => {
+                log::warn!("message timeout, clearing buffer");
+                buf.clear();
+                continue;
+            }
+        };
+
+        // exit on eof
+        if n == 0 {
+            break;
+        }
+
+        last_read = Instant::now();
+        buf.extend_from_slice(&tmp[..n]);
+
+        // make sure we're not just reading garbage forever
+        if buf.len() > MAX_MESSAGE_SIZE {
+            log::warn!("max message size exceeded");
+            buf.clear();
+            continue;
+        }
+
+        // try to parse messages from the read bytes
+        loop {
+            let mut reader = &mut &buf[..];
+            let record = match DeviceMsg::unpack(&mut reader) {
+                Ok(r) => r,
+
+                // we probably have not gotten the entire message yet, go back to reading bytes.
+                // if the message is corrupted, we will eventually hit MESSAGE_TIMEOUT or
+                // MAX_MESSAGE_SIZE.
+                Err(UnpackErr::UnexpectedEof) => break,
+
+                // on any other error, the message is corrupt. clear the buffer.
+                Err(e) => {
+                    log::warn!("corrupt message: {e:?}");
+                    buf.clear();
+                    break;
+                }
+            };
+
+            // remove the decoded bytes from buf
+            if reader.is_empty() {
+                buf.clear();
+            } else {
+                let bytes_read = buf.len() - reader.len();
+                buf.rotate_left(bytes_read);
+                buf.truncate(buf.len() - bytes_read);
+            }
+
+            if let Err(_) = tx.send(record).await {
+                log::info!("channel closed, closing serial thingy");
+                return Ok(());
+            }
+
+            // if there are no more bytes, stop trying to decode messages.
+            if buf.is_empty() {
+                break;
+            }
+        }
+
+        ctx.request_repaint();
+    }
+
+    Ok(())
+}

editor/src/serial/scan.rs

@@ -0,0 +1,141 @@
+use std::{
+    collections::HashMap,
+    fs::read_dir,
+    path::{Path, PathBuf},
+    process::Command,
+    str,
+};
+
+use eyre::Context;
+
+/// Scan for the keyboard serial device
+pub fn scan_for_serial() -> eyre::Result<Option<PathBuf>> {
+    log::info!("scanning for keyboard serial device");
+
+    let mut syspaths = vec![];
+
+    // Reqursively scan all "/sys/bus/usb/devices/usb*" folders for files called "dev"
+    // and get the paths to the parent folders of those "dev" files.
+    for f in read_dir("/sys/bus/usb/devices/")? {
+        let f = f?;
+        let file_name = f.file_name();
+        let Some(name) = file_name.to_str() else {
+            continue;
+        };
+
+        if !name.starts_with("usb") {
+            continue;
+        }
+
+        let mut paths = scan_usb_for_devs(&f.path())?;
+        syspaths.append(&mut paths);
+    }
+
+    log::debug!("checking these devices: {syspaths:#?}");
+
+    for syspath in syspaths {
+        let syspath = syspath.to_string_lossy();
+        let devname = Command::new("udevadm")
+            .args(["info", "-q", "name", "-p", &syspath])
+            .output()
+            .wrap_err("failed to run udevadmn to query dev name")?;
+
+        let devname = str::from_utf8(&devname.stdout)
+            .wrap_err("failed to parse udevadm output as utf-8")?
+            .trim();
+
+        let devname = Path::new(devname);
+
+        // Ignore USB hubs and such
+        if devname.starts_with("bus/") {
+            continue;
+        }
+
+        let devpath = Path::new("/dev").join(devname);
+
+        let properties = Command::new("udevadm")
+            .args(["info", "-q", "property", "--export", "-p", &syspath])
+            .output()
+            .wrap_err("failed to run udevadmn to query properities")?;
+
+        let properties = str::from_utf8(&properties.stdout)
+            .wrap_err("failed to parse udevadm output as utf-8")?;
+
+        let properties = parse_env(properties);
+        let Some(properties) = parse_properties(&properties) else {
+            continue;
+        };
+
+        log::debug!("{devpath:?}: {properties:#?}");
+
+        let is_serial_device = [
+            properties.model == "Tangentbord1",
+            properties.vendor == "Tux",
+            properties.vendor_id == "b00b",
+            properties.usb_type == "generic",
+            properties.usb_driver == "cdc_acm",
+        ]
+        .into_iter()
+        .all(|b| b);
+
+        if is_serial_device {
+            return Ok(Some(devpath));
+        }
+    }
+
+    Ok(None)
+}
+
+#[allow(dead_code)]
+#[derive(Debug)]
+struct Properties<'a> {
+    model: &'a str,
+    serial: &'a str,
+    serial_short: &'a str,
+    vendor: &'a str,
+    vendor_id: &'a str,
+    usb_type: &'a str,
+    usb_driver: &'a str,
+}
+
+fn parse_properties<'a>(properties: &HashMap<&'a str, &'a str>) -> Option<Properties<'a>> {
+    Some(Properties {
+        model: *properties.get("ID_MODEL")?,
+        serial: *properties.get("ID_SERIAL")?,
+        serial_short: *properties.get("ID_SERIAL_SHORT")?,
+        vendor: *properties.get("ID_VENDOR")?,
+        vendor_id: *properties.get("ID_VENDOR_ID")?,
+        usb_type: *properties.get("ID_USB_TYPE")?,
+        usb_driver: *properties.get("ID_USB_DRIVER")?,
+    })
+}
+
+fn parse_env(s: &str) -> HashMap<&str, &str> {
+    s.lines()
+        .filter_map(|line| {
+            let (key, val) = line.split_once('=')?;
+            let val = val.trim_matches('\'');
+            Some((key, val))
+        })
+        .collect()
+}
+
+fn scan_usb_for_devs(p: &Path) -> eyre::Result<Vec<PathBuf>> {
+    let mut out = vec![];
+
+    for f in read_dir(p)? {
+        let f = f?;
+        let meta = f.metadata()?;
+        let path = f.path();
+        if meta.is_dir() {
+            let mut results = scan_usb_for_devs(&path)?;
+            out.append(&mut results);
+        } else if meta.is_file() && f.file_name() == "dev" {
+            if let Some(parent) = path.parent() {
+                out.push(parent.to_owned());
+            }
+        }
+    }
+
+    Ok(out)
+}

layers-left.ron

@@ -1,31 +0,0 @@
-[
-	Layer(
-		buttons: [
-			// Row 1
-			Key(Apostrophe),
-			Key(Comma),
-			Key(Period),
-			Key(P),
-			Key(Y),
-
-			// Row 2
-			Key(A),
-			Key(O),
-			Key(E),
-			Key(U),
-			Key(I),
-
-			// Row 3
-			Key(Colon),
-			Key(Q),
-			Key(J),
-			Key(K),
-			Key(X),
-
-			// Thumbpad
-			Mod(LShift),
-			Mod(LCtrl),
-			NextLayer,
-		],
-	)
-]

layers-right.ron

@@ -1,31 +0,0 @@
-[
-	Layer(
-		buttons: [
-			// Row 1
-			Key(F),
-			Key(G),
-			Key(C),
-			Key(R),
-			Key(L),
-
-			// Row 2
-			Key(D),
-			Key(H),
-			Key(T),
-			Key(N),
-			Key(S),
-
-			// Row 3
-			Key(B),
-			Key(M),
-			Key(W),
-			Key(V),
-			Key(Z),
-
-			// Thumbpad
-			PrevLayer,
-			Mod(RAlt),
-			Mod(RMod),
-		],
-	)
-]

left/.cargo/config.toml

@@ -0,0 +1,2 @@
+[build]
+target = "thumbv6m-none-eabi"

left/Cargo.toml

@@ -0,0 +1,28 @@
+[package]
+name = "tangentbord1-left"
+version = "0.1.0"
+authors = ["Joakim Hulthe <joakim@hulthe.net>"]
+description = "Keyboard firmware"
+edition = "2021"
+
+[dependencies.tangentbord1]
+path = "../lib"
+package = "tangentbord1-lib"
+
+[dependencies]
+cortex-m-rt = "0.7"
+embassy-rp = { version = "0.1.0", features = ["time-driver", "critical-section-impl"] }
+embassy-executor = { version = "0.5.0", features = ["nightly", "executor-thread", "integrated-timers", "arch-cortex-m"] }
+embassy-sync = "0.5.0"
+embassy-time = "0.3.0"
+embassy-futures = "0.1.1"
+log = "0.4.17"
+postcard = { version = "1.0.4", features = ["alloc"] }
+
+[build-dependencies]
+ron = "0.8.0"
+postcard = { version = "1", features = ["use-std"] }
+
+[build-dependencies.tangentbord1]
+path = "../lib"
+package = "tangentbord1-lib"

left/build.rs

@@ -13,12 +13,11 @@ use std::io::Write;
 use std::path::PathBuf;
 use std::{env, fs};
 
-use tgnt::layer::Layer;
+use tangentbord1::layer::Layer;
 
 fn main() {
     memory();
-    serialize_layout("./layers-left.ron", "./src/bin/layers-left.pc");
+    serialize_layout("./layers.ron", "./src/layers.pc");
-    serialize_layout("./layers-right.ron", "./src/bin/layers-right.pc");
 }
 
 fn memory() {
@@ -27,7 +26,7 @@ fn memory() {
     let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
     File::create(out.join("memory.x"))
         .unwrap()
-        .write_all(include_bytes!("memory.x"))
+        .write_all(include_bytes!("../memory.x"))
         .unwrap();
     println!("cargo:rustc-link-search={}", out.display());
 
@@ -35,7 +34,7 @@ fn memory() {
     // any file in the project changes. By specifying `memory.x`
     // here, we ensure the build script is only re-run when
     // `memory.x` is changed.
-    println!("cargo:rerun-if-changed=memory.x");
+    println!("cargo:rerun-if-changed=../memory.x");
 
     // --nmagic turns off page alignment of sections (which saves flash space)
     println!("cargo:rustc-link-arg-bins=--nmagic");
@@ -47,9 +46,10 @@ fn memory() {
 
 fn serialize_layout(ron_path: &str, postcard_path: &str) {
     println!("cargo:rerun-if-changed={ron_path}");
+    println!("cargo:rerun-if-changed={postcard_path}");
 
     let layers = fs::read_to_string(ron_path).expect("Failed to read .ron");
-    let layers: Vec<Layer> = ron::from_str(&layers).expect("Failed to deserialize .ron");
+    let layers: Vec<Vec<Layer>> = ron::from_str(&layers).expect("Failed to deserialize .ron");
 
     let serialized = postcard::to_stdvec(&layers).expect("Failed to serialize layers");
 

left/layers.ron

@@ -0,0 +1,180 @@
+[
+	[
+		Layer(
+			buttons: [
+				// Row 1
+				Key(Escape),
+				Key(Comma),
+				Key(Period),
+				Key(P),
+				Key(Y),
+
+				// Row 2
+				ModTap(A, LAlt),
+				ModTap(O, LMod),
+				ModTap(E, LShift),
+				ModTap(U, LCtrl),
+				Key(I),
+
+				// Row 3
+				Key(Colon),
+				Key(Q),
+				Key(J),
+				Key(K),
+				Key(X),
+
+				// Thumbpad
+				Key(Backspace),
+				Key(Space),
+				Layer(Peek, Right, 1),
+			],
+		),
+		Layer(
+			buttons: [
+				// Row 1
+				Key(Escape),
+				Key(Slash),
+				Key(Equal),
+				Key(Accent),
+				Key(Period),
+
+				// Row 2
+				ModTap(BackslashPipe, LAlt),
+				ModTap(Dash, LMod),
+				ModTap(LBracket, LShift),
+				ModTap(RBracket, LCtrl),
+				Key(Tab),
+
+				// Row 3
+				None,
+				None,
+				None,
+				Key(Apostrophe),
+				None,
+
+				// Thumbpad
+				Key(Backspace),
+				Key(Space),
+				Layer(Peek, Right, 1),
+			],
+		),
+		Layer(
+			buttons: [
+				// Row 1
+				Key(F1),
+				Key(F4),
+				Key(F7),
+				Key(F10),
+				None,
+
+				// Row 2
+				Key(F2),
+				Key(F5),
+				Key(F8),
+				Key(F11),
+				None,
+
+				// Row 3
+				Key(F3),
+				Key(F6),
+				Key(F9),
+				Key(F12),
+				None,
+
+				// Thumbpad
+				Key(Backspace),
+				Key(Space),
+				Layer(Peek, Right, 1),
+			],
+		),
+	],
+	[ // gaming row
+		Layer(
+			buttons: [
+				// Row 1
+				Key(Escape),
+				Key(Q),
+				Key(W),
+				Key(E),
+				Key(R),
+
+				// Row 2
+				Mod(LShift),
+				Key(A),
+				Key(S),
+				Key(D),
+				Key(F),
+
+				// Row 3
+				Mod(LCtrl),
+				Key(Z),
+				Key(X),
+				Key(C),
+				Key(V),
+
+				// Thumbpad
+				Key(Backspace),
+				Key(Space),
+				Layer(Peek, Right, 1),
+			],
+		),
+		Layer(
+			buttons: [
+				// Row 1
+				Key(D1),
+				Key(D2),
+				Key(D3),
+				Key(D4),
+				Key(D5),
+
+				// Row 2
+				Key(D6),
+				Key(D7),
+				Key(D8),
+				Key(D9),
+				Key(D0),
+
+				// Row 3
+				None,
+				None,
+				None,
+				None,
+				None,
+
+				// Thumbpad
+				Key(Backspace),
+				Key(Space),
+				Layer(Peek, Right, 1),
+			],
+		),
+		Layer(
+			buttons: [
+				// Row 1
+				None,
+				None,
+				None,
+				None,
+				None,
+
+				// Row 2
+				None,
+				None,
+				None,
+				None,
+				None,
+
+				// Row 3
+				None,
+				None,
+				None,
+				None,
+				None,
+
+				// Thumbpad
+				Key(Backspace),
+				Key(Space),
+				Layer(Peek, Right, 1),
+			],
+		),
+	],
+]

left/src/main.rs

@@ -0,0 +1,117 @@
+//! Firmware for Tangentbord1, left half.
+
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+#![cfg(target_arch = "arm")]
+
+extern crate alloc;
+extern crate cortex_m_rt;
+
+use alloc::vec::Vec;
+use embassy_executor::Spawner;
+use embassy_rp::gpio::{Level, Output, Pin};
+use embassy_time::Timer;
+use log::error;
+use tangentbord1::{
+    board::Board,
+    event::Half,
+    interrupts::Irqs,
+    keyboard::KeyboardConfig,
+    layer::Layer,
+    logger::LogMultiplexer,
+    rgb::Rgb,
+    util::stall,
+    ws2812::Ws2812,
+    {allocator, rtt, uart, usb},
+};
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let half = Half::Left;
+
+    let rtt_write = rtt::init_rtt_logger();
+
+    allocator::init();
+
+    let p = embassy_rp::init(Default::default());
+    let board = Board::from(p);
+
+    let _neopixel_power = Output::new(board.neopixel_power, Level::High);
+
+    let mut neopixel = Ws2812::new(board.PIO0, Irqs, board.DMA_CH0, board.neopixel);
+    let neopixels_d5 = Ws2812::new(board.PIO1, Irqs, board.DMA_CH1, board.d5);
+
+    neopixel.write(&[Rgb::new(0xFF, 0x00, 0x00)]).await;
+
+    let layers = include_bytes!("layers.pc");
+    let Ok(layers): Result<Vec<Vec<Layer>>, _> = postcard::from_bytes(layers) else {
+        log::error!("Failed to deserialize layer config");
+        stall().await
+    };
+
+    let keyboard = KeyboardConfig {
+        half,
+        pins: [
+            // row 1
+            board.d24.degrade(),
+            board.a3.degrade(),
+            board.a2.degrade(),
+            board.a1.degrade(),
+            board.a0.degrade(),
+            // row 2
+            board.d25.degrade(),
+            board.sck.degrade(),
+            board.mosi.degrade(),
+            board.miso.degrade(),
+            board.d2.degrade(),
+            // row 3
+            board.d12.degrade(),
+            board.d11.degrade(),
+            board.d10.degrade(),
+            board.d9.degrade(),
+            board.d3.degrade(),
+            // thumbpad
+            board.d7.degrade(),
+            board.scl.degrade(),
+            board.sda.degrade(),
+        ],
+        // the index of the LEDs is different than the switch index.
+        // each number is the index of the LED for the switch of that index.
+        led_map: [4, 3, 2, 1, 0, 5, 6, 7, 8, 9, 14, 13, 12, 11, 10, 15, 16, 17],
+        led_driver: neopixels_d5,
+        layers,
+    };
+
+    let Some([events1, events2]) = keyboard.create().await else {
+        error!("failed to create keyboard");
+        return;
+    };
+
+    uart::start(board.tx, board.rx, board.UART0, half, events2).await;
+
+    neopixel.write(&[Rgb::new(0x00, 0x99, 0x99)]).await;
+
+    let usb_logger = usb::setup_logger_and_keyboard(board.USB, events1).await;
+
+    let logger = LogMultiplexer {
+        outputs: [rtt_write, usb_logger],
+    };
+    logger.init();
+
+    log::error!("log_level: error");
+    log::warn!("log_level: warn");
+    log::info!("log_level: info");
+    log::debug!("log_level: debug");
+    log::trace!("log_level: trace");
+
+    neopixel.write(&[Rgb::new(0x00, 0x00, 0xFF)]).await;
+    Timer::after_secs(5).await;
+
+    for b in (0u8..0xff).rev() {
+        neopixel.write(&[Rgb::new(0, 0, b)]).await;
+        Timer::after_millis(10).await;
+    }
+
+    stall().await
+}

lib/.cargo/config.toml

@@ -0,0 +1,2 @@
+[build]
+target = "thumbv6m-none-eabi"

lib/Cargo.toml

@@ -0,0 +1,62 @@
+[package]
+name = "tangentbord1-lib"
+version = "0.1.0"
+authors = ["Joakim Hulthe <joakim@hulthe.net>"]
+description = "Keyboard firmware"
+edition = "2021"
+
+[dependencies]
+#tgnt = { git = "https://git.nubo.sh/hulthe/tgnt.git", default-features = false }
+cortex-m = "0.7.6"
+cortex-m-rt = "0.7"
+embedded-hal = "0.2.5"
+static_cell = "1.0.0"
+embedded-io-async = "*"
+futures = { version = "0.3", default-features = false, features = ["async-await"] }
+embassy-executor = { version = "0.5.0", features = ["nightly", "nightly", "executor-thread", "integrated-timers"] }
+embassy-sync = "0.5.0"
+embassy-time = "0.3.0"
+embassy-futures = "0.1.1"
+log = "0.4.17"
+pio = "0.2.1"
+pio-proc = "0.2.1"
+smart-leds = "0.3.0"
+embedded-alloc = "0.5.0"
+postcard = { version = "1.0.4", features = ["alloc"] }
+fixed = "1.23.1"
+rtt-target = "0.4.0"
+heapless = "0.7.16"
+once_cell = { version = "1.17.1", default-features = false }
+critical-section = "1.1.1"
+crc-any = "2.4.3"
+serde = { version = "1.0.163", default-features = false, features = ["derive"] }
+bytemuck = { version = "1.13.1", features = ["derive"] }
+libm = "0.2.8"
+glam = { version = "0.25.0", default-features = false, features = ["libm"] }
+msgpck = { version = "0.2.8", features = ["alloc"] }
+#atomic-polyfill = "1.0.2"
+portable-atomic = { version = "1.6.0", default-features = false }
+
+[target.'cfg(target_arch = "x86_64")'.dependencies]
+embassy-executor = { version = "0.5.0", features = ["arch-std"] }
+embassy-time = { version = "0.3.0", features = ["std", "generic-queue"] }
+simple_logger = "4"
+
+[target.thumbv6m-none-eabi.dependencies]
+embassy-rp = { version = "0.1.0", features = ["time-driver", "critical-section-impl"] }
+embassy-executor = { version = "0.5.0", features = ["arch-cortex-m"] }
+embassy-usb = { version = "0.1.0", features = ["usbd-hid"] }
+embassy-usb-logger = "0.1.0"
+embassy-usb-driver = "0.1.0"
+usb-device = "0.2.9"
+usbd-hid = "0.6.1"
+
+[build-dependencies]
+#tgnt = { git = "https://git.nubo.sh/hulthe/tgnt.git", default-features = false }
+ron = "0.8.0"
+postcard = { version = "1", features = ["use-std"] }
+
+[features]
+std = []
+default = ["n-key-rollover"]
+n-key-rollover=[]

lib/memory.x

@@ -0,0 +1,15 @@
+MEMORY {
+    BOOT2 : ORIGIN = 0x10000000, LENGTH = 0x100
+    FLASH : ORIGIN = 0x10000100, LENGTH = 2048K - 0x100
+    RAM   : ORIGIN = 0x20000000, LENGTH = 256K
+}
+
+EXTERN(BOOT2_FIRMWARE)
+
+SECTIONS {
+    /* ### Boot loader */
+    .boot2 ORIGIN(BOOT2) :
+    {
+        KEEP(*(.boot2));
+    } > BOOT2
+} INSERT BEFORE .text;

lib/src/allocator.rs

@@ -4,11 +4,12 @@ use core::mem::MaybeUninit;
 
 use embedded_alloc::Heap;
 
+pub const HEAP_SIZE: usize = 4096;
+
 #[global_allocator]
 static HEAP: Heap = Heap::empty();
 
 pub fn init() {
-    const HEAP_SIZE: usize = 4096;
     static mut HEAP_MEM: [MaybeUninit<u8>; HEAP_SIZE] = [MaybeUninit::uninit(); HEAP_SIZE];
     unsafe { HEAP.init(HEAP_MEM.as_ptr() as usize, HEAP_SIZE) }
 }

lib/src/atomics.rs

@@ -0,0 +1,28 @@
+use portable_atomic::{AtomicU32, Ordering};
+
+pub struct AtomicCoord {
+    inner: AtomicU32,
+}
+
+impl AtomicCoord {
+    pub const fn new() -> Self {
+        AtomicCoord {
+            inner: AtomicU32::new(0),
+        }
+    }
+
+    pub fn load(&self, ordering: Ordering) -> (u16, u16) {
+        let [a, b, c, d] = self.inner.load(ordering).to_ne_bytes();
+        let x = u16::from_ne_bytes([a, b]);
+        let y = u16::from_ne_bytes([c, d]);
+
+        (x, y)
+    }
+
+    pub fn store(&self, x: u16, y: u16, ordering: Ordering) {
+        let [a, b] = x.to_ne_bytes();
+        let [c, d] = y.to_ne_bytes();
+        let xy = u32::from_ne_bytes([a, b, c, d]);
+        self.inner.store(xy, ordering);
+    }
+}

lib/src/button.rs

@@ -0,0 +1,107 @@
+use core::fmt::{self, Debug, Display};
+use msgpck::{MsgPack, MsgUnpack};
+use serde::{Deserialize, Serialize};
+
+use crate::keys::Key;
+
+#[repr(u8)]
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize, MsgPack, MsgUnpack)]
+pub enum Modifier {
+    LCtrl = 0x01,
+    LShift = 0x02,
+    LAlt = 0x04,
+    LMod = 0x08,
+    RCtrl = 0x10,
+    RShift = 0x20,
+    RAlt = 0x40,
+    RMod = 0x80,
+}
+
+impl From<Modifier> for u8 {
+    fn from(modifier: Modifier) -> Self {
+        modifier as u8
+    }
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize, MsgPack, MsgUnpack)]
+#[non_exhaustive]
+pub enum Button {
+    Mod(Modifier),
+    Key(Key),
+    ModTap(Key, Modifier),
+    Compose2(CompShift, Key, CompShift, Key),
+    Compose3(CompShift, Key, CompShift, Key, CompShift, Key),
+    Layer(LayerShift, LayerDir, u16),
+    None,
+}
+
+/// Whether a key should be shift modified as part of a compose chain.
+#[derive(
+    Clone, Copy, Debug, Default, PartialEq, Eq, Serialize, Deserialize, MsgPack, MsgUnpack,
+)]
+pub enum CompShift {
+    /// Do not shift the key. [Key::A] becomes 'a'.
+    #[default]
+    Lower,
+
+    /// Shift the key. [Key::A] becomes 'A'.
+    Upper,
+
+    /// Shift the key if shift is being held down. [Key::A] becomes 'a' or 'A' depending.
+    Variable,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize, MsgPack, MsgUnpack)]
+pub enum LayerDir {
+    Left,
+    Right,
+    Up,
+    Down,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize, MsgPack, MsgUnpack)]
+pub enum LayerShift {
+    Move,
+    Peek,
+}
+
+impl Display for Button {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let cs = |cs: &CompShift| match cs {
+            CompShift::Lower => "",
+            CompShift::Upper => "⇧",
+            CompShift::Variable => "⇧?",
+        };
+
+        match self {
+            Button::Mod(modifier) => Debug::fmt(&modifier, f),
+            Button::Key(key) => write!(f, "{key:?}"),
+            Button::ModTap(key, modifier) => write!(f, "{key:?}/{modifier}"),
+            Button::Compose2(cs1, k1, cs2, k2) => {
+                write!(f, "⎄ {}{k1:?} {}{k2:?}", cs(cs1), cs(cs2))
+            }
+            Button::Compose3(cs1, k1, cs2, k2, cs3, k3) => {
+                write!(f, "⎄ {}{k1:?} {}{k2:?} {}{k3:?}", cs(cs1), cs(cs2), cs(cs3))
+            }
+            Button::Layer(..) => write!(f, "Lr"),
+            Button::None => write!(f, "Ø"),
+        }
+    }
+}
+
+impl Display for Modifier {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let s = match self {
+            Modifier::LCtrl => "⎈",
+            Modifier::LShift => "⇧",
+            Modifier::LAlt => "⎇",
+            Modifier::LMod => "◆",
+            Modifier::RCtrl => "⎈",
+            Modifier::RShift => "⇧",
+            Modifier::RAlt => "⎇",
+            Modifier::RMod => "◆",
+        };
+
+        write!(f, "{s}")
+    }
+}

lib/src/event.rs

@@ -0,0 +1,59 @@
+use crate::{button::Button, keys::Key};
+use core::time::Duration;
+use serde::{Deserialize, Serialize};
+
+pub mod switch {
+    use super::*;
+
+    #[derive(Clone, Debug, Serialize, Deserialize, PartialEq, Eq)]
+    /// A switch was pressed or released
+    ///
+    /// This event is triggered by tasks that monitor switches.
+    pub struct Event {
+        /// The keyboard half that triggered the event.
+        pub source: Half,
+
+        /// The index of the button that triggered the event.
+        pub source_button: usize,
+
+        pub kind: EventKind,
+    }
+
+    #[derive(Clone, Debug, Serialize, Deserialize, PartialEq, Eq)]
+    pub enum EventKind {
+        Press {
+            button: Button,
+        },
+        Release {
+            button: Button,
+
+            /// The duration that the button was held down for
+            after: Duration,
+        },
+    }
+}
+
+pub mod button {
+    use super::*;
+    use crate::button::Modifier;
+
+    /// A usb keyboard button was pressed or released.
+    ///
+    /// This is a lower-level event than a [switch::Event], as things like ModTap and Compose are
+    /// converted to Presses and Releases.
+    #[derive(Clone, Debug, PartialEq, Eq)]
+    pub enum Event {
+        PressKey(Key),
+        ReleaseKey(Key),
+        PressMod(Modifier),
+        ReleaseMod(Modifier),
+        Wait,
+    }
+}
+
+/// A keyboard half.
+#[derive(Copy, Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub enum Half {
+    Left,
+    Right,
+}

lib/src/interrupts.rs

@@ -0,0 +1,13 @@
+use embassy_rp::{
+    bind_interrupts,
+    peripherals::{PIO0, PIO1, UART0, USB},
+};
+
+bind_interrupts! {
+    pub struct Irqs {
+        UART0_IRQ => embassy_rp::uart::BufferedInterruptHandler<UART0>;
+        USBCTRL_IRQ => embassy_rp::usb::InterruptHandler<USB>;
+        PIO0_IRQ_0 => embassy_rp::pio::InterruptHandler<PIO0>;
+        PIO1_IRQ_0 => embassy_rp::pio::InterruptHandler<PIO1>;
+    }
+}

lib/src/keyboard.rs

@@ -0,0 +1,358 @@
+mod lights;
+
+use core::sync::atomic::Ordering;
+
+use alloc::vec::Vec;
+use embassy_executor::Spawner;
+use embassy_rp::{
+    gpio::{AnyPin, Input, Pin, Pull},
+    peripherals::PIO1,
+};
+use embassy_sync::pubsub::{ImmediatePublisher, PubSubChannel, Subscriber};
+use embassy_time::{Duration, Instant, Timer};
+use log::{debug, error, info, warn};
+use static_cell::StaticCell;
+
+use crate::{
+    atomics::AtomicCoord,
+    button::{Button, LayerDir, LayerShift},
+    event::{
+        switch::{Event, EventKind},
+        Half,
+    },
+    layer::{Layer, Layers},
+    lights::Lights,
+    serial_proto::{
+        borrowed::DeviceMsg,
+        owned::{ChangeLayer, SwitchPress, SwitchRelease},
+    },
+    usb::serial::serial_send,
+    util::{SwapCell, SwapCellRead, CS},
+    ws2812::Ws2812,
+};
+
+pub struct KeyboardConfig {
+    /// Which board is this.
+    pub half: Half,
+    /// Array of input pins of each switch
+    pub pins: [AnyPin; SWITCH_COUNT],
+    /// Array of LED indices of each switch
+    pub led_map: [usize; SWITCH_COUNT],
+    pub led_driver: Ws2812<PIO1>,
+    /// Matrix of layers. Stored as rows of columns.
+    pub layers: Vec<Vec<Layer>>,
+}
+
+struct State {
+    /// Which board is this.
+    half: Half,
+    current_layer: AtomicCoord,
+    layer_cols: usize,
+    layer_rows: usize,
+    layers: SwapCellRead<Layers>,
+    /// Array of LED indices of each switch
+    led_map: [usize; SWITCH_COUNT],
+    lights: Lights<PIO1, SWITCH_COUNT>,
+}
+
+/// Number of [KbEvents] returned by [KeyboardConfig::create].
+pub const KB_SUBSCRIBERS: usize = 2;
+
+/// Max number of subscribers for [KB_EVENTS]. Equals [KB_SUBSCRIBERS] plus the two used by
+/// [layer_switch_task] and [lights::task].
+const ACTUAL_KB_SUBSCRIBERS: usize = KB_SUBSCRIBERS + 2;
+
+const KB_EVENT_CAP: usize = 128;
+static KB_EVENTS: PubSubChannel<CS, Event, KB_EVENT_CAP, ACTUAL_KB_SUBSCRIBERS, 0> =
+    PubSubChannel::new();
+pub struct KbEvents {
+    pub subscriber: Subscriber<'static, CS, Event, KB_EVENT_CAP, ACTUAL_KB_SUBSCRIBERS, 0>,
+    pub publisher: ImmediatePublisher<'static, CS, Event, KB_EVENT_CAP, ACTUAL_KB_SUBSCRIBERS, 0>,
+}
+
+pub struct KbEventsTx<'a> {
+    publisher:
+        &'a mut ImmediatePublisher<'static, CS, Event, KB_EVENT_CAP, ACTUAL_KB_SUBSCRIBERS, 0>,
+}
+
+pub struct KbEventsRx<'a> {
+    subscriber: &'a mut Subscriber<'static, CS, Event, KB_EVENT_CAP, ACTUAL_KB_SUBSCRIBERS, 0>,
+}
+
+impl KeyboardConfig {
+    pub async fn create(self) -> Option<[KbEvents; KB_SUBSCRIBERS]> {
+        let spawner = Spawner::for_current_executor().await;
+
+        if self.layers.is_empty() {
+            error!("no layers defined");
+            return None;
+        }
+
+        info!(
+            "setting up keyboard layout with {} layer(s)",
+            self.layers.len()
+        );
+
+        for (y, row) in self.layers.iter().enumerate() {
+            for (x, layer) in row.iter().enumerate() {
+                if layer.buttons.len() != SWITCH_COUNT {
+                    warn!(
+                        "layer ({x}, {y}) defines {} buttons, but there are {SWITCH_COUNT} switches",
+                        layer.buttons.len(),
+                    )
+                }
+            }
+        }
+
+        let layer_cols = self.layers.iter().map(|row| row.len()).max().unwrap_or(0);
+        let layer_rows = self.layers.len();
+
+        static LAYERS: StaticCell<SwapCell<Layers>> = StaticCell::new();
+        let layers = LAYERS.init_with(|| SwapCell::new(self.layers));
+        let (layers_read, layers_write) = layers.split();
+
+        static STATE: StaticCell<State> = StaticCell::new();
+        let state = STATE.init_with(|| State {
+            half: self.half,
+            current_layer: AtomicCoord::new(),
+            layer_cols,
+            layer_rows,
+            layers: layers_read,
+            lights: Lights::new(self.led_driver),
+            led_map: self.led_map,
+        });
+
+        for (i, pin) in self.pins.into_iter().enumerate() {
+            if spawner.spawn(switch_task(i, pin, state)).is_err() {
+                error!("failed to spawn switch task, pool_size mismatch?");
+                break;
+            }
+        }
+
+        spawner.must_spawn(layer_switch_task(
+            KbEvents {
+                publisher: KB_EVENTS.immediate_publisher(),
+                subscriber: KB_EVENTS
+                    .subscriber()
+                    .expect("Not enough KbEvents allocated"),
+            },
+            state,
+        ));
+
+        spawner.must_spawn(lights::task(
+            KbEvents {
+                publisher: KB_EVENTS.immediate_publisher(),
+                subscriber: KB_EVENTS
+                    .subscriber()
+                    .expect("Not enough KbEvents allocated"),
+            },
+            state,
+        ));
+
+        Some([(); KB_SUBSCRIBERS].map(|_| {
+            KbEvents {
+                publisher: KB_EVENTS.immediate_publisher(),
+                subscriber: KB_EVENTS
+                    .subscriber()
+                    .expect("Not enough KbEvents allocated"),
+            }
+        }))
+    }
+}
+
+impl KbEvents {
+    pub async fn send(&mut self, event: Event) {
+        self.publisher.publish_immediate(event);
+    }
+
+    pub async fn recv(&mut self) -> Event {
+        self.subscriber.next_message_pure().await
+    }
+
+    pub fn split(&mut self) -> (KbEventsRx, KbEventsTx) {
+        let tx = KbEventsTx {
+            publisher: &mut self.publisher,
+        };
+        let rx = KbEventsRx {
+            subscriber: &mut self.subscriber,
+        };
+        (rx, tx)
+    }
+}
+
+impl KbEventsRx<'_> {
+    pub async fn recv(&mut self) -> Event {
+        self.subscriber.next_message_pure().await
+    }
+}
+
+impl KbEventsTx<'_> {
+    pub fn send(&mut self, event: Event) {
+        self.publisher.publish_immediate(event);
+    }
+}
+
+pub const MOD_TAP_TIME: Duration = Duration::from_millis(200);
+pub const SWITCH_COUNT: usize = 18;
+pub const DEBOUNCE_THRESHOLD: Duration = Duration::from_millis(15);
+
+/// Task for monitoring a single switch pin, and handling button presses.
+#[embassy_executor::task(pool_size = 18)]
+async fn switch_task(switch_num: usize, pin: AnyPin, state: &'static State) -> ! {
+    let _pin_nr = pin.pin();
+    let mut pin = Input::new(pin, Pull::Up);
+    let events = KB_EVENTS.immediate_publisher();
+    loop {
+        // pins are pull-up, so when the switch is pressed they are brought low.
+        pin.wait_for_low().await;
+        let pressed_at = Instant::now();
+
+        // TODO: do we need debouncing?
+
+        // get current layer
+        let (x, y) = state.current_layer.load(Ordering::Relaxed);
+
+        let layers = state.layers.read();
+        let Some(Layer { buttons }) = layers
+            .get(usize::from(y))
+            .and_then(|row| row.get(usize::from(x)))
+        else {
+            // currently layer is null, do nothing
+            pin.wait_for_high().await;
+            continue;
+        };
+
+        let button = buttons.get(switch_num).cloned();
+        drop(layers);
+
+        // and current button
+        let Some(button) = button else {
+            warn!("no button defined for switch {switch_num}");
+            pin.wait_for_high().await;
+            continue;
+        };
+
+        debug!("switch {switch_num} button {button:?} pressed");
+        serial_send(&DeviceMsg::SwitchPress(SwitchPress(switch_num as u16)));
+
+        let ev = |kind| Event {
+            source: state.half,
+            source_button: switch_num,
+            kind,
+        };
+
+        events.publish_immediate(ev(EventKind::Press {
+            button: button.clone(),
+        }));
+
+        Timer::after(DEBOUNCE_THRESHOLD).await;
+        pin.wait_for_high().await;
+        let released_after = pressed_at.elapsed();
+
+        debug!("switch {switch_num} button {button:?} released");
+        serial_send(&DeviceMsg::SwitchRelease(SwitchRelease(switch_num as u16)));
+
+        events.publish_immediate(ev(EventKind::Release {
+            button: button.clone(),
+            after: released_after.into(),
+        }));
+
+        Timer::after(DEBOUNCE_THRESHOLD).await;
+    }
+}
+
+#[embassy_executor::task]
+async fn layer_switch_task(mut events: KbEvents, state: &'static State) {
+    let col_count = state.layer_cols as u16;
+    let row_count = state.layer_rows as u16;
+    let Some(last_row) = row_count.checked_sub(1) else {
+        error!("no layers specified");
+        return;
+    };
+
+    let Some(last_col) = col_count.checked_sub(1) else {
+        error!("no layers specified");
+        return;
+    };
+
+    loop {
+        use LayerDir::*;
+        use LayerShift::*;
+
+        let event = events.recv().await;
+        let (x, y) = state.current_layer.load(Ordering::Relaxed);
+        let (nx, ny) = match event.kind {
+            EventKind::Press { button } => match button {
+                Button::Layer(_, Up, n) => (x, y.checked_sub(n).unwrap_or(last_row)),
+                Button::Layer(_, Down, n) => (x, y.wrapping_add(n) % row_count),
+                Button::Layer(_, Left, n) => (x.checked_sub(n).unwrap_or(last_col), y),
+                Button::Layer(_, Right, n) => (x.wrapping_add(n) % col_count, y),
+                _ => continue,
+            },
+            EventKind::Release { button, .. } => match button {
+                Button::Layer(Peek, Up, n) => (x, y.wrapping_add(n) % row_count),
+                Button::Layer(Peek, Down, n) => (x, y.checked_sub(n).unwrap_or(last_row)),
+                Button::Layer(Peek, Left, n) => (x.wrapping_add(n) % col_count, y),
+                Button::Layer(Peek, Right, n) => (x.checked_sub(n).unwrap_or(last_col), y),
+                _ => continue,
+            },
+        };
+
+        state.current_layer.store(nx, ny, Ordering::Relaxed);
+        serial_send(&DeviceMsg::ChangeLayer(ChangeLayer { x: nx, y: ny }));
+        debug!("switched to layer ({nx}, {ny})");
+    }
+}
+
+/// Random functions for testing
+#[allow(dead_code)]
+pub mod test {
+    use crate::{button::Button, keys::Key};
+
+    pub fn letter_to_key(c: char) -> Button {
+        if !c.is_ascii() {
+            return Button::None;
+        }
+
+        let c = c.to_ascii_uppercase();
+
+        let key = match c {
+            'A' => Key::A,
+            'B' => Key::B,
+            'C' => Key::C,
+            'D' => Key::D,
+            'E' => Key::E,
+            'F' => Key::F,
+            'G' => Key::G,
+            'H' => Key::H,
+            'I' => Key::I,
+            'J' => Key::J,
+            'K' => Key::K,
+            'L' => Key::L,
+            'M' => Key::M,
+            'N' => Key::N,
+            'O' => Key::O,
+            'P' => Key::P,
+            'Q' => Key::Q,
+            'R' => Key::R,
+            'S' => Key::S,
+            'T' => Key::T,
+            'U' => Key::U,
+            'V' => Key::V,
+            'W' => Key::W,
+            'X' => Key::X,
+            'Y' => Key::Y,
+            'Z' => Key::Z,
+            ' ' => Key::Space,
+            '\n' => Key::Return,
+            _ => {
+                log::info!("char {c:?} -> None");
+                return Button::None;
+            }
+        };
+
+        log::info!("char {c:?} -> {key:?}");
+
+        Button::Key(key)
+    }
+}

lib/src/keyboard/lights.rs

@@ -0,0 +1,247 @@
+use core::future::pending;
+
+use embassy_time::{Duration, Instant, Timer};
+use futures::{select_biased, FutureExt};
+
+use crate::{
+    button::Button,
+    lights::shaders::{PowerOffAnim, PowerOnAnim, Shader, Shaders},
+    rgb::Rgb,
+    usb::{UsbEvent, USB_EVENTS},
+};
+
+use super::{Event, EventKind, KbEvents, State, SWITCH_COUNT};
+
+/// Duration until the keyboard starts the idle animation
+const UNTIL_IDLE: Duration = Duration::from_secs(30);
+
+/// DUration between each animation frame.
+const FRAMETIME: Duration = Duration::from_millis(16);
+
+const IDLE_ANIM: Shaders = Shaders::OrthoRainbow;
+
+#[derive(Default)]
+enum LightsState {
+    Active {
+        keys: [KeyLedState; SWITCH_COUNT],
+        next_frame: Instant,
+        idle_at: Instant,
+    },
+    PoweringOff(PowerOffAnim),
+    PoweringOn(PowerOnAnim),
+    #[default]
+    PoweredOff,
+    Idle(Shaders),
+}
+
+impl LightsState {
+    pub fn active_default() -> Self {
+        let now = Instant::now();
+        LightsState::Active {
+            keys: Default::default(),
+            next_frame: now,
+            idle_at: now + UNTIL_IDLE,
+        }
+    }
+}
+
+#[derive(Clone, Copy, Default)]
+enum KeyLedState {
+    #[default]
+    None,
+    Solid(Rgb),
+    FadeBy(f32),
+}
+
+#[embassy_executor::task]
+pub(super) async fn task(mut events: KbEvents, state: &'static State) {
+    let mut lights = LightsState::default();
+    let mut usb_events = USB_EVENTS
+        .dyn_subscriber()
+        .expect("USB_EVENTS: out of subscribers");
+
+    loop {
+        match &mut lights {
+            LightsState::Active {
+                keys,
+                next_frame,
+                idle_at,
+            } => {
+                select_biased! {
+                    event = events.recv().fuse() => {
+                        *idle_at = Instant::now() + UNTIL_IDLE;
+                        handle_event(event, state, keys).await;
+                    }
+                    ev = usb_events.next_message_pure().fuse() => {
+                        *idle_at = Instant::now() + UNTIL_IDLE;
+                        handle_usb_event(ev, &mut lights).await;
+                    }
+                    _ = Timer::at(*idle_at).fuse() => lights = LightsState::Idle(IDLE_ANIM),
+                    _ = Timer::at(*next_frame).fuse() => {
+                        keypress_tick(state, keys).await;
+                        *next_frame = Instant::now() + FRAMETIME;
+                    }
+                }
+            }
+            LightsState::PoweringOff(anim) => {
+                select_biased! {
+                    ev = usb_events.next_message_pure().fuse() => handle_usb_event(ev, &mut lights).await,
+                    _ = play_shader(state, anim).fuse() => lights = LightsState::PoweredOff,
+                }
+            }
+            LightsState::PoweringOn(anim) => {
+                select_biased! {
+                    ev = usb_events.next_message_pure().fuse() => handle_usb_event(ev, &mut lights).await,
+                    _ = play_shader(state, anim).fuse() => lights = LightsState::active_default(),
+                }
+            }
+            LightsState::PoweredOff => {
+                let ev = usb_events.next_message_pure().await;
+                handle_usb_event(ev, &mut lights).await;
+            }
+            LightsState::Idle(anim) => {
+                select_biased! {
+                    ev = usb_events.next_message_pure().fuse() => handle_usb_event(ev, &mut lights).await,
+                    event = events.recv().fuse() => {
+                        let now = Instant::now();
+                        let mut keys = Default::default();
+                        handle_event(event, state, &mut keys).await;
+                        lights = LightsState::Active { keys, next_frame: now, idle_at: now + UNTIL_IDLE};
+                    }
+                    _ = play_shader(state, anim).fuse() => {}
+                }
+            }
+        };
+    }
+}
+
+async fn play_shader(state: &'static State, shader: &impl Shader) {
+    const SWITCH_COORDS: [(u16, u16); SWITCH_COUNT] = [
+        (0, 1),
+        (1, 1),
+        (2, 1),
+        (3, 1),
+        (4, 1),
+        (4, 2),
+        (3, 2),
+        (2, 2),
+        (1, 2),
+        (0, 2),
+        (0, 3),
+        (1, 3),
+        (2, 3),
+        (3, 3),
+        (4, 3),
+        (2, 4),
+        (3, 4),
+        (4, 4),
+    ];
+
+    const BRIGHTNESS: f32 = 1.00;
+
+    let switch_coords = SWITCH_COORDS.map(|(x, y)| (f32::from(x) / 4.0, f32::from(y) / 4.0));
+
+    let animate_shader = async {
+        loop {
+            let now = Instant::now();
+
+            state
+                .lights
+                .update(|rgbs| {
+                    (switch_coords.into_iter().zip(rgbs.iter_mut()))
+                        .for_each(|(uv, rgb)| *rgb = shader.sample(now, uv) * BRIGHTNESS)
+                })
+                .await;
+
+            Timer::after(FRAMETIME).await;
+        }
+    };
+
+    let end_animation = async {
+        match shader.end_time() {
+            Some(end_time) => Timer::at(end_time).await,
+            None => pending().await,
+        };
+    };
+
+    select_biased! {
+        _ = animate_shader.fuse() => {}
+        _ = end_animation.fuse() => {}
+    }
+}
+
+async fn keypress_tick(state: &'static State, lights: &mut [KeyLedState; SWITCH_COUNT]) {
+    state
+        .lights
+        .update(|rgbs| {
+            for (button, light) in lights.iter_mut().enumerate() {
+                let Some(&led_id) = state.led_map.get(button) else {
+                    continue;
+                };
+                let Some(rgb) = rgbs.get_mut(led_id) else {
+                    continue;
+                };
+
+                match &*light {
+                    KeyLedState::None => *rgb = Rgb::new(0, 0, 0),
+                    KeyLedState::FadeBy(fade) => {
+                        let [r, g, b] = rgb
+                            .components()
+                            .map(|c| ((c as f32) * fade.clamp(0.0, 1.0)) as u8);
+                        *rgb = Rgb::new(r, g, b);
+                        if *rgb == Rgb::new(0, 0, 0) {
+                            *light = KeyLedState::None;
+                        }
+                    }
+                    &KeyLedState::Solid(color) => *rgb = color,
+                }
+            }
+        })
+        .await;
+}
+
+async fn handle_event(
+    event: Event,
+    state: &'static State,
+    lights: &mut [KeyLedState; SWITCH_COUNT],
+) {
+    let rgb = match event.kind {
+        EventKind::Press { button } => match button {
+            Button::Key(..) => KeyLedState::Solid(Rgb::new(0, 150, 0)),
+            Button::Mod(..) => KeyLedState::Solid(Rgb::new(0, 0, 150)),
+            Button::ModTap(..) => KeyLedState::Solid(Rgb::new(0, 0, 150)),
+            Button::Compose2(..) | Button::Compose3(..) => {
+                KeyLedState::Solid(Rgb::new(0, 100, 100))
+            }
+            Button::Layer(..) => KeyLedState::Solid(Rgb::new(120, 0, 120)),
+            _ => KeyLedState::Solid(Rgb::new(150, 0, 0)),
+        },
+        EventKind::Release { .. } => KeyLedState::FadeBy(0.85),
+    };
+
+    if event.source != state.half {
+        return;
+    }
+
+    let Some(light) = lights.get_mut(event.source_button) else {
+        return;
+    };
+    *light = rgb;
+}
+
+async fn handle_usb_event(event: UsbEvent, state: &mut LightsState) {
+    let usb_enabled = match event {
+        UsbEvent::Suspended(false) | UsbEvent::Configured(true) => true,
+        UsbEvent::Configured(false) | UsbEvent::Suspended(true) | UsbEvent::Reset => false,
+        _ => return,
+    };
+
+    let start = Instant::now();
+    *state = match (&state, usb_enabled) {
+        (LightsState::PoweringOn(..), true) => return,
+        (LightsState::PoweringOff(..), false) => return,
+        (LightsState::PoweredOff, false) => return,
+        (_, true) => LightsState::PoweringOn(PowerOnAnim { start }),
+        (_, false) => LightsState::PoweringOff(PowerOffAnim { start }),
+    };
+}

lib/src/keypress_handler.rs

@@ -0,0 +1,505 @@
+use core::future::pending;
+
+use crate::{
+    button::{Button, CompShift, Modifier},
+    event::{button, switch, Half},
+    keys::Key,
+};
+use embassy_sync::pubsub::{publisher::Pub, subscriber::Sub, PubSubBehavior, WaitResult};
+use embassy_time::{Duration, Instant, Timer};
+use futures::FutureExt;
+use heapless::Deque;
+use log::{debug, error};
+
+/// The time a ModTap button takes to resolve as a Mod while being held down.
+const MOD_TAP_TIME: Duration = Duration::from_millis(150);
+
+/// The number of switches on this keyboard half.
+const SWITCH_COUNT: usize = 18;
+
+/// The usb keycode mapped to Compose.
+const COMPOSE_KEY: Key = Key::Application;
+
+/// This function perpetually converts between [switch::Event]s and [button::Event]s.
+///
+/// Call it from a dedicated task.
+pub async fn keypress_handler(
+    input: &mut Sub<'_, impl PubSubBehavior<switch::Event>, switch::Event>,
+    output: &mut Pub<'_, impl PubSubBehavior<button::Event>, button::Event>,
+) -> ! {
+    type SwitchIndex = usize;
+
+    #[derive(Debug)]
+    struct PressEvent {
+        source_button: SwitchIndex,
+        source_half: Half,
+        button: Button,
+        time: Instant,
+    }
+
+    #[derive(Default)]
+    struct ShiftHeld {
+        left: bool,
+        right: bool,
+    }
+
+    impl ShiftHeld {
+        pub fn either(&self) -> bool {
+            self.left || self.right
+        }
+    }
+
+    async fn slow_press(
+        output: &mut Pub<'_, impl PubSubBehavior<button::Event>, button::Event>,
+        shift_held: &mut ShiftHeld,
+        button: &Button,
+    ) {
+        let do_compose = |keys: &[(CompShift, Key)]| {
+            for &(comp_shift, key) in keys {
+                match comp_shift {
+                    // Release any pressed shift keys
+                    CompShift::Lower => {
+                        if shift_held.left {
+                            output.publish_immediate(button::Event::ReleaseMod(Modifier::LShift));
+                        }
+                        if shift_held.right {
+                            output.publish_immediate(button::Event::ReleaseMod(Modifier::RShift));
+                        }
+                    }
+
+                    // Press shift if not already pressed
+                    CompShift::Upper if !shift_held.either() => {
+                        output.publish_immediate(button::Event::PressMod(Modifier::LShift));
+                    }
+                    _ => {}
+                }
+                output.publish_immediate(button::Event::PressKey(key));
+                output.publish_immediate(button::Event::ReleaseKey(key));
+                output.publish_immediate(button::Event::Wait);
+
+                match comp_shift {
+                    // Re-press any shift keys we released
+                    CompShift::Lower => {
+                        if shift_held.left {
+                            output.publish_immediate(button::Event::PressMod(Modifier::LShift));
+                        }
+                        if shift_held.right {
+                            output.publish_immediate(button::Event::PressMod(Modifier::RShift));
+                        }
+                    }
+
+                    // Release the shift keys we pressed
+                    CompShift::Upper if !shift_held.either() => {
+                        output.publish_immediate(button::Event::ReleaseMod(Modifier::LShift));
+                    }
+                    _ => {}
+                }
+            }
+        };
+
+        let event = match button {
+            &Button::Mod(m) | &Button::ModTap(_, m) => {
+                match m {
+                    Modifier::LShift => shift_held.left = true,
+                    Modifier::RShift => shift_held.right = true,
+                    _ => {}
+                }
+
+                button::Event::PressMod(m)
+            }
+            &Button::Key(k) => button::Event::PressKey(k),
+            &Button::Compose2(csa, a, csb, b) => {
+                do_compose(&[(CompShift::Variable, COMPOSE_KEY), (csa, a), (csb, b)]);
+                return;
+            }
+            &Button::Compose3(csa, a, csb, b, csc, c) => {
+                do_compose(&[
+                    (CompShift::Variable, COMPOSE_KEY),
+                    (csa, a),
+                    (csb, b),
+                    (csc, c),
+                ]);
+                return;
+            }
+            _ => return,
+        };
+        output.publish_immediate(event);
+    }
+
+    async fn slow_release(
+        output: &mut Pub<'_, impl PubSubBehavior<button::Event>, button::Event>,
+        shift_held: &mut ShiftHeld,
+        button: &Button,
+    ) {
+        let event = match button {
+            &Button::Mod(m) | &Button::ModTap(_, m) => {
+                match m {
+                    Modifier::LShift => shift_held.left = false,
+                    Modifier::RShift => shift_held.right = false,
+                    _ => {}
+                }
+
+                button::Event::ReleaseMod(m)
+            }
+            &Button::Key(k) => button::Event::ReleaseKey(k),
+            _ => return,
+        };
+        output.publish_immediate(event);
+    }
+
+    // queue of button presses that are waiting for ModTap
+    let mut queue = Deque::<PressEvent, { 2 * SWITCH_COUNT }>::new();
+    let queue = &mut queue;
+
+    // tracks whether a shift-key is being held down.
+    // required to properly play compose macros.
+    let mut shift_held = ShiftHeld::default();
+
+    loop {
+        // create a future that waits for the next ModTap to time out
+        let modtap_timeout = async {
+            loop {
+                if let Some(event) = queue.front() {
+                    let Button::ModTap(..) = event.button else {
+                        error!("first element in queue wasn't a modtap, wtf?");
+                        let _ = queue.pop_front();
+                        continue;
+                    };
+
+                    let timeout = event.time + MOD_TAP_TIME;
+                    Timer::at(timeout).await;
+                    return queue.pop_front().unwrap();
+                } else {
+                    // if the queue is empty, never return.
+                    return pending().await;
+                }
+            }
+        };
+
+        let event = futures::select_biased! {
+            event = input.next_message().fuse() => event,
+            event = modtap_timeout.fuse() => {
+                // first element in queue timed out, and will be treated as a Mod
+                let &Button::ModTap(..) = &event.button else {
+                    error!("first element in queue wasn't a modtap, wtf?");
+                    continue;
+                };
+                debug!("modtap resolved as mod: {:?}", event.button);
+                slow_press(output, &mut shift_held, &event.button).await;
+
+                loop {
+                    let Some(event) = queue.pop_front() else { break };
+
+                    // resolve events until we encounter another ModTap,
+                    // then put it back in the queue and stop
+                    if let Button::ModTap(..) = &event.button {
+                        queue.push_front(event).expect("we just popped, the queue can't be full");
+                        break;
+                    }
+                    slow_press(output, &mut shift_held, &event.button).await;
+                }
+
+                continue;
+            },
+        };
+
+        let WaitResult::Message(event) = event else {
+            error!("lagged");
+            continue;
+        };
+
+        let time = Instant::now();
+        debug!("event: {:?}", event.kind);
+        match event.kind {
+            switch::EventKind::Press { button } => {
+                let insert = |queue: &mut Deque<_, 36>, button| {
+                    if let Some(_queued) = queue
+                        .iter()
+                        .find(|queued: &&PressEvent| queued.source_button == event.source_button)
+                        .filter(|queued| queued.source_half == event.source)
+                    {
+                        error!("tried to add PressEvent to queue twice");
+                    } else if queue
+                        .push_back(PressEvent {
+                            source_half: event.source,
+                            source_button: event.source_button,
+                            button,
+                            time,
+                        })
+                        .is_err()
+                    {
+                        error!("button queue full. this shouldn't happen.");
+                    }
+                };
+
+                match button {
+                    Button::ModTap(..) => {
+                        debug!("adding modtap to queue");
+                        // add event to queue
+                        insert(queue, button);
+                    }
+                    Button::Mod(..)
+                    | Button::Key(..)
+                    | Button::Compose2(..)
+                    | Button::Compose3(..) => {
+                        if queue.is_empty() {
+                            debug!("sending key now");
+                            // otherwise, send immediately
+                            slow_press(output, &mut shift_held, &button).await;
+                        } else {
+                            debug!("adding key to queue");
+                            // if events in queue, also add to queue
+                            insert(queue, button);
+                        }
+                    }
+                    _ => {}
+                }
+            }
+            switch::EventKind::Release { button, .. } => {
+                let position_in_queue = queue
+                    .iter()
+                    .enumerate()
+                    .filter(|(_, queued)| queued.source_half == event.source)
+                    .find(|(_, queued)| queued.source_button == event.source_button)
+                    .map(|(i, _)| i);
+
+                match button {
+                    Button::ModTap(k, _) => {
+                        // check if modtap in queue
+                        if let Some(position_in_queue) = position_in_queue {
+                            // If the modtap was still in the queue, it hasn't been resolved as a mod
+                            // yet. Therefore, it is a Tap. Resolve all ModTaps before this one as Mods
+                            debug!("modtap was still in queue: {k:?}");
+                            for _ in 0..position_in_queue {
+                                let prev_event = queue.pop_front().unwrap();
+                                debug!("pressing earlier event {:?}", prev_event);
+                                slow_press(output, &mut shift_held, &prev_event.button).await;
+                            }
+                            let _ = queue.pop_front();
+                            debug!("pressing modtap as key");
+                            slow_press(output, &mut shift_held, &Button::Key(k)).await;
+                            slow_release(output, &mut shift_held, &Button::Key(k)).await;
+                        } else {
+                            // If the ModTap wasn't in the queue, it has already been resolved as a Mod.
+                            debug!("modtap wasn't in queue, releasing");
+                            slow_release(output, &mut shift_held, &button).await;
+                        };
+                    }
+                    Button::Mod(..)
+                    | Button::Key(..)
+                    | Button::Compose2(..)
+                    | Button::Compose3(..) => {
+                        // if this press event was in queue, resolve all ModTaps before in queue as Mods
+                        // otherwise, just resolve this
+                        if let Some(position_in_queue) = position_in_queue {
+                            debug!(
+                                "key was in queue, pressing all events up to and including this"
+                            );
+                            for _ in 0..=position_in_queue {
+                                let prev_event = queue.pop_front().unwrap();
+                                debug!("pressing {prev_event:?}");
+                                slow_press(output, &mut shift_held, &prev_event.button).await;
+                            }
+                        }
+                        debug!("releasing key {button:?}");
+                        slow_release(output, &mut shift_held, &button).await;
+                    }
+                    _ => {}
+                }
+            }
+        }
+    }
+}
+
+#[cfg(all(target_arch = "x86_64", test))]
+mod tests {
+    use core::time;
+
+    use super::*;
+
+    use alloc::vec;
+    use alloc::vec::Vec;
+    use embassy_futures::{
+        join::join,
+        select::{select, Either},
+    };
+    use embassy_sync::{blocking_mutex::raw::NoopRawMutex, pubsub::PubSubChannel};
+    use embassy_time::with_timeout;
+    use tgnt::{button::Modifier, keys::Key};
+
+    struct Test {
+        // button index, pressed, delay
+        input: Vec<(usize, bool, Duration)>,
+        expected: Vec<button::Event>,
+    }
+
+    macro_rules! timing_test {
+        ($name:ident, $test:expr) => {
+            #[test]
+            fn $name() {
+                let test: Test = $test;
+                run_test(test);
+            }
+        };
+    }
+
+    const SHORT: Duration = Duration::from_millis(1);
+    const LONG: Duration = Duration::from_millis(160);
+
+    timing_test! {
+        modtap_mod,
+        Test {
+            input: vec![
+                (0, true, SHORT),
+                (1, true, SHORT),
+                (1, false, SHORT),
+                (0, false, SHORT),
+            ],
+            expected: vec![
+                button::Event::PressMod(Modifier::LShift),
+                button::Event::PressKey(Key::B),
+                button::Event::ReleaseKey(Key::B),
+                button::Event::ReleaseMod(Modifier::LShift),
+            ],
+        }
+    }
+    timing_test! {
+        modtap_tap,
+        Test {
+            input: vec![
+                (0, true, SHORT),
+                (1, true, SHORT),
+                (0, false, SHORT),
+                (1, false, SHORT),
+            ],
+            expected: vec![
+                button::Event::PressKey(Key::A),
+                button::Event::ReleaseKey(Key::A),
+                button::Event::PressKey(Key::B),
+                button::Event::ReleaseKey(Key::B),
+            ],
+        }
+    }
+
+    timing_test! { modtap_tap_2x, Test {
+        input: vec![
+            (0, true, SHORT),
+            (2, true, SHORT),
+            (2, false, SHORT),
+            (0, false, SHORT),
+            (0, true, SHORT),
+            (2, true, SHORT),
+            (2, false, SHORT),
+            (0, false, SHORT),
+        ],
+        expected: vec![
+            button::Event::PressMod(Modifier::LShift),
+            button::Event::PressKey(Key::C),
+            button::Event::ReleaseKey(Key::C),
+            button::Event::ReleaseMod(Modifier::LShift),
+            button::Event::PressMod(Modifier::LShift),
+            button::Event::PressKey(Key::C),
+            button::Event::ReleaseKey(Key::C),
+            button::Event::ReleaseMod(Modifier::LShift),
+        ],
+    }}
+
+    timing_test! { modtap_double_shift, Test {
+        input: vec![
+            (0, true, LONG),
+            (3, true, SHORT),
+            (0, false, LONG),
+            (3, false, SHORT),
+        ],
+        expected: vec![
+            button::Event::PressMod(Modifier::LShift),
+            button::Event::ReleaseMod(Modifier::LShift),
+            button::Event::PressMod(Modifier::RShift),
+            button::Event::ReleaseMod(Modifier::RShift),
+        ],
+    }}
+
+    fn run_test(test: Test) {
+        let _ = simple_logger::SimpleLogger::new().init();
+
+        let switch_events = PubSubChannel::<NoopRawMutex, switch::Event, 10, 1, 1>::new();
+        let button_events = PubSubChannel::<NoopRawMutex, button::Event, 10, 1, 1>::new();
+        let mut button_sub = button_events.subscriber().unwrap();
+
+        let buttons = [
+            Button::ModTap(Key::A, Modifier::LShift),
+            Button::ModTap(Key::B, Modifier::LCtrl),
+            Button::Key(Key::C),
+            Button::ModTap(Key::D, Modifier::RShift),
+        ];
+
+        // future that iterates over the test input and sends switch events.
+        let clicker = async {
+            for &(i, pressed, delay) in &test.input {
+                let kind = if pressed {
+                    switch::EventKind::Press {
+                        button: buttons[i].clone(),
+                    }
+                } else {
+                    switch::EventKind::Release {
+                        button: buttons[i].clone(),
+                        after: time::Duration::ZERO, // ignore
+                    }
+                };
+
+                let event = switch::Event {
+                    source: Half::Left,
+                    source_button: i,
+                    kind,
+                };
+
+                switch_events.publish_immediate(event);
+
+                Timer::after(delay).await;
+            }
+        };
+        let output_listener = async {
+            let mut got = Vec::new();
+            for _expected in &test.expected {
+                let timeout = LONG + Duration::from_millis(50);
+                let event = match with_timeout(timeout, button_sub.next_message()).await {
+                    Ok(WaitResult::Message(event)) => event,
+                    Ok(WaitResult::Lagged(_)) => return Err(("lagged", got)),
+                    Err(_) => return Err(("timeout", got)),
+                };
+
+                got.push(event.clone());
+            }
+
+            for (event, expected) in got.iter().zip(test.expected.iter()) {
+                if event != expected {
+                    return Err(("unexpected event", got));
+                }
+            }
+
+            Ok(())
+        };
+
+        embassy_futures::block_on(async {
+            let r = select(
+                join(clicker, output_listener),
+                keypress_handler(
+                    &mut *switch_events.subscriber().unwrap(),
+                    &mut *button_events.publisher().unwrap(),
+                ),
+            )
+            .await;
+
+            match r {
+                Either::First(((), Ok(()))) => {}
+                Either::First(((), Err((msg, got)))) => panic!(
+                    "timing test failed due to {msg}.\nexpected={:#?} got={:#?}",
+                    test.expected, got
+                ),
+                Either::Second(never) => never,
+            }
+        });
+
+        panic!();
+    }
+}

lib/src/keys.rs

@@ -0,0 +1,269 @@
+use msgpck::{MsgPack, MsgUnpack};
+use serde::{Deserialize, Serialize};
+
+#[repr(u8)]
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize, MsgPack, MsgUnpack)]
+#[non_exhaustive]
+// https://usb.org/sites/default/files/hut1_3_0.pdf
+pub enum Key {
+    A = 0x04,
+    B = 0x05,
+    C = 0x06,
+    D = 0x07,
+    E = 0x08,
+    F = 0x09,
+    G = 0x0A,
+    H = 0x0B,
+    I = 0x0C,
+    J = 0x0D,
+    K = 0x0E,
+    L = 0x0F,
+    M = 0x10,
+    N = 0x11,
+    O = 0x12,
+    P = 0x13,
+    Q = 0x14,
+    R = 0x15,
+    S = 0x16,
+    T = 0x17,
+    U = 0x18,
+    V = 0x19,
+    W = 0x1A,
+    X = 0x1B,
+    Y = 0x1C,
+    Z = 0x1D,
+
+    /// Keyboard 1 and !
+    D1 = 0x1E,
+    /// Keyboard 2 and @
+    D2 = 0x1F,
+    /// Keyboard 3 and #
+    D3 = 0x20,
+    /// Keyboard 4 and $
+    D4 = 0x21,
+    /// Keyboard 5 and %
+    D5 = 0x22,
+    /// Keyboard 6 and ∧
+    D6 = 0x23,
+    /// Keyboard 7 and &
+    D7 = 0x24,
+    /// Keyboard 8 and *
+    D8 = 0x25,
+    /// Keyboard 9 and (
+    D9 = 0x26,
+    /// Keyboard 0 and )
+    D0 = 0x27,
+
+    Return = 0x28,
+    Escape = 0x29,
+    /// Keyboard DELETE (Backspace)
+    Backspace = 0x2A,
+    Tab = 0x2B,
+
+    /// Keyboard Spacebar
+    Space = 0x2C,
+    /// Keyboard - and (underscore)
+    Dash = 0x2D,
+    /// Keyboard = and +2
+    Equal = 0x2E,
+    /// Keyboard [ and {
+    LBracket = 0x2F,
+    /// Keyboard ] and }
+    RBracket = 0x30,
+    /// Keyboard \and |
+    BackslashPipe = 0x31,
+    /// Keyboard Non-US # and  ̃
+    Pound = 0x32,
+    /// Keyboard ; and :
+    Colon = 0x33,
+    /// Keyboard ‘ and “
+    Apostrophe = 0x34,
+    /// Keyboard Grave Accent and Tilde
+    Accent = 0x35,
+    /// Keyboard , and <
+    Comma = 0x36,
+    /// Keyboard . and >
+    Period = 0x37,
+    /// Keyboard / and ?
+    Slash = 0x38,
+    CapsLock = 0x39,
+
+    F1 = 0x3A,
+    F2 = 0x3B,
+    F3 = 0x3C,
+    F4 = 0x3D,
+    F5 = 0x3E,
+    F6 = 0x3F,
+    F7 = 0x40,
+    F8 = 0x41,
+    F9 = 0x42,
+    F10 = 0x43,
+    F11 = 0x44,
+    F12 = 0x45,
+
+    /// Keyboard PrintScreen
+    PrintScreen = 0x46,
+    /// Keyboard Scroll Lock
+    ScrollLock = 0x47,
+    /// Keyboard Pause
+    Pause = 0x48,
+    /// Keyboard Insert
+    Insert = 0x49,
+    /// Keyboard Home
+    Home = 0x4A,
+    /// Keyboard PageUp
+    PageUp = 0x4B,
+    /// Keyboard Delete Forward
+    Delete = 0x4C,
+    /// Keyboard End
+    End = 0x4D,
+    /// Keyboard PageDown
+    PageDown = 0x4E,
+    /// Keyboard RightArrow
+    RightArrow = 0x4F,
+    /// Keyboard LeftArrow
+    LeftArrow = 0x50,
+    /// Keyboard DownArrow
+    DownArrow = 0x51,
+    /// Keyboard UpArrow
+    UpArrow = 0x52,
+    /// Keypad Num Lock and Clear
+    KeypadNumLock = 0x53,
+    /// Keypad /
+    KeypadSlash = 0x54,
+    /// Keypad *
+    KeypadAsterisk = 0x55,
+    /// Keypad -
+    KeypadMinus = 0x56,
+    /// Keypad +
+    KeypadPlus = 0x57,
+    /// KeypadEnter
+    KeypadEnter = 0x58,
+    /// Keypad 1 and End
+    Keypad1 = 0x59,
+    /// Keypad 2 and Down Arrow
+    Keypad2 = 0x5A,
+    /// Keypad 3 and PageDn
+    Keypad3 = 0x5B,
+    /// Keypad 4 and Left Arrow
+    Keypad4 = 0x5C,
+    /// Keypad 5
+    Keypad5 = 0x5D,
+    /// Keypad 6 and Right Arrow
+    Keypad6 = 0x5E,
+    /// Keypad 7 and Home
+    Keypad7 = 0x5F,
+    /// Keypad 8 and Up Arrow
+    Keypad8 = 0x60,
+    /// Keypad 9 and PageUp
+    Keypad9 = 0x61,
+    /// Keypad 0 and Insert
+    Keypad0 = 0x62,
+
+    /// Keypad . and Delete
+    KbPeriod = 0x63,
+    /// Keyboard Non-US \ and |
+    NonUsBackslashPipe = 0x64,
+    Application = 0x65,
+    Power = 0x66,
+    /// Keypad =
+    KpEqual = 0x67,
+    F13 = 0x68,
+    F14 = 0x69,
+    F15 = 0x6A,
+    F16 = 0x6B,
+    F17 = 0x6C,
+    F18 = 0x6D,
+    F19 = 0x6E,
+    F20 = 0x6F,
+    F21 = 0x70,
+    F22 = 0x71,
+    F23 = 0x72,
+    F24 = 0x73,
+    Execute = 0x74,
+    Help = 0x75,
+    Menu = 0x76,
+    Select = 0x77,
+    Stop = 0x78,
+    Again = 0x79,
+    Undo = 0x7A,
+    Cut = 0x7B,
+    Copy = 0x7C,
+    Paste = 0x7D,
+    Find = 0x7E,
+    Mute = 0x7F,
+    VolumeUp = 0x80,
+    VolumeDown = 0x81,
+    /// Keyboard Locking Caps Lock
+    LockingCapsLock = 0x82,
+    /// Keyboard Locking Num Lock
+    LockingNumLock = 0x83,
+    /// Keyboard Locking Scroll Lock
+    LockingScrollLock = 0x84,
+    /// Keypad ,
+    KpComma = 0x85,
+    /// Keypad Equal Sign
+    KpEqualSIgn = 0x86,
+
+    International1 = 0x87,
+    International2 = 0x88,
+    International3 = 0x89,
+    International4 = 0x8A,
+    International5 = 0x8B,
+    International6 = 0x8C,
+    International7 = 0x8D,
+    International8 = 0x8E,
+    International9 = 0x8F,
+    Lang1 = 0x90,
+    Lang2 = 0x91,
+    Lang3 = 0x92,
+    Lang4 = 0x93,
+    Lang5 = 0x94,
+    Lang6 = 0x95,
+    Lang7 = 0x96,
+    Lang8 = 0x97,
+    Lang9 = 0x98,
+    /// Keyboard Alternative Erase
+    AltErase = 0x99,
+    /// Keyboard SysReq/Attention
+    SysReq = 0x9A,
+    Cancel = 0x9B,
+    Clear = 0x9C,
+    Prior = 0x9D,
+    /// Keyboard Return
+    Return2 = 0x9E,
+    /// Keyboard Separator
+    Separator = 0x9F,
+
+    /// Keyboard Out
+    Out = 0xA0,
+    /// Keyboard Oper
+    Oper = 0xA1,
+    /// Keyboard Clear/Again
+    ClearAgain = 0xA2,
+    /// Keyboard CrSel/Props
+    CrSel = 0xA3,
+    /// Keyboard ExSel
+    ExSel = 0xA4,
+    //
+    // NOTE: the usb keyboard/keypad page allegedly har characters in the rage above A4,
+    // like the ones below, but they don't seem to work
+    ///// Keypad {
+    //LCurly = 0xB8,
+    ///// Keypad }
+    //RCurly = 0xB9,
+    //
+    // NOTE: Not sure if these are required
+    //LCtrl = 0xE0,
+    //LShift = 0xE1,
+    //LAlt = 0xE2,
+    //RCtrl = 0xE4,
+    //RShift = 0xE5,
+    //RAlt = 0xE6,
+}
+
+impl From<Key> for u8 {
+    fn from(key: Key) -> u8 {
+        key as u8
+    }
+}

lib/src/layer.rs

@@ -0,0 +1,12 @@
+use alloc::vec::Vec;
+use msgpck::{MsgPack, MsgUnpack};
+use serde::{Deserialize, Serialize};
+
+use crate::button::Button;
+
+#[derive(Default, Debug, Serialize, Deserialize, Clone, MsgPack, MsgUnpack)]
+pub struct Layer {
+    pub buttons: Vec<Button>,
+}
+
+pub type Layers = Vec<Vec<Layer>>;

lib/src/layout.rs

@@ -0,0 +1,36 @@
+use alloc::vec::Vec;
+use serde::{Deserialize, Serialize};
+
+#[derive(Default, Debug, Serialize, Deserialize)]
+pub struct Layout {
+    pub buttons: Vec<Rect>,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct Rect {
+    pub x: f32,
+    pub y: f32,
+
+    #[serde(default = "default_width")]
+    pub w: f32,
+    #[serde(default = "default_height")]
+    pub h: f32,
+}
+
+impl Default for Rect {
+    fn default() -> Self {
+        Self {
+            x: 0.0,
+            y: 0.0,
+            w: default_width(),
+            h: default_height(),
+        }
+    }
+}
+
+fn default_width() -> f32 {
+    1.0
+}
+fn default_height() -> f32 {
+    1.0
+}

lib/src/lib.rs

@@ -0,0 +1,37 @@
+#![cfg_attr(not(feature = "std"), no_std)]
+#![feature(type_alias_impl_trait)]
+#![feature(split_array)]
+
+extern crate alloc;
+
+#[cfg(target_arch = "arm")]
+pub mod allocator;
+#[cfg(target_arch = "arm")]
+pub mod board;
+#[cfg(target_arch = "arm")]
+pub mod interrupts;
+#[cfg(target_arch = "arm")]
+pub mod keyboard;
+#[cfg(target_arch = "arm")]
+pub mod lights;
+#[cfg(target_arch = "arm")]
+pub mod panic_handler;
+#[cfg(target_arch = "arm")]
+pub mod uart;
+#[cfg(target_arch = "arm")]
+pub mod usb;
+#[cfg(target_arch = "arm")]
+pub mod ws2812;
+
+pub mod atomics;
+pub mod button;
+pub mod event;
+pub mod keypress_handler;
+pub mod keys;
+pub mod layer;
+pub mod layout;
+pub mod logger;
+pub mod rgb;
+pub mod rtt;
+pub mod serial_proto;
+pub mod util;

lib/src/lights.rs

@@ -0,0 +1,43 @@
+pub mod shaders;
+
+use crate::ws2812::Ws2812;
+use embassy_rp::pio;
+use embassy_sync::mutex::Mutex;
+
+use crate::{rgb::Rgb, util::CS};
+
+pub struct Lights<P: pio::Instance + 'static, const N: usize> {
+    state: Mutex<CS, State<P, N>>,
+}
+
+struct State<P: pio::Instance + 'static, const N: usize> {
+    colors: [Rgb; N],
+    driver: Ws2812<P>,
+}
+
+impl<P: pio::Instance, const N: usize> Lights<P, N> {
+    pub const fn new(driver: Ws2812<P>) -> Self {
+        Lights {
+            state: Mutex::new(State {
+                colors: [Rgb::new(0, 0, 0); N],
+                driver,
+            }),
+        }
+    }
+
+    pub fn colors_mut(&mut self) -> &[Rgb; N] {
+        &self.state.get_mut().colors
+    }
+
+    /// Run a function to update the colors, and then immediately refresh the LEDs.
+    pub async fn update(&self, f: impl FnOnce(&mut [Rgb; N])) {
+        let State { colors, driver } = &mut *self.state.lock().await;
+        f(colors);
+        driver.write(colors).await
+    }
+
+    /// Update the LEDs with the currently set colors.
+    pub async fn refresh(&self) {
+        self.update(|_| ()).await;
+    }
+}

lib/src/lights/shaders.rs

@@ -0,0 +1,117 @@
+use core::f32::consts::PI;
+
+use embassy_time::{Duration, Instant};
+use glam::{vec2, vec3, Vec3};
+use libm::cosf;
+
+use crate::rgb::Rgb;
+
+/// A fragment shader.
+pub trait Shader {
+    /// Sample a normalized coordinate (0 to 1) using the shader function and return a color.
+    fn sample(&self, time: Instant, uv: (f32, f32)) -> Rgb;
+
+    fn end_time(&self) -> Option<Instant> {
+        None
+    }
+}
+
+pub enum Shaders {
+    OrthoRainbow,
+    LsdHyperspace,
+}
+
+impl Shader for Shaders {
+    fn sample(&self, time: Instant, uv: (f32, f32)) -> Rgb {
+        match self {
+            Shaders::OrthoRainbow => OrthoRainbow.sample(time, uv),
+            Shaders::LsdHyperspace => LsdHyperspace.sample(time, uv),
+        }
+    }
+}
+
+pub struct OrthoRainbow;
+impl Shader for OrthoRainbow {
+    fn sample(&self, time: Instant, (x, y): (f32, f32)) -> Rgb {
+        let time = time.as_millis() as f32 / 1000.0;
+        let r = 0.5 + 0.5 * cosf(time + x + 0.0);
+        let g = 0.5 + 0.5 * cosf(time + y + 2.0);
+        let b = 0.5 + 0.5 * cosf(time + x + 4.0);
+
+        Rgb::from_f32s(r, g, b)
+    }
+}
+
+pub struct LsdHyperspace;
+impl Shader for LsdHyperspace {
+    fn sample(&self, time: Instant, uv: (f32, f32)) -> Rgb {
+        let time = time.as_millis() as f32 / 1000.0 * 3.0;
+        let uv = vec2(uv.0, uv.1);
+
+        let center = vec2(0.5, 0.5);
+
+        let dist = (uv - center).length();
+
+        let fac = dist * PI + vec3(0.0, 1.0, 4.0) - time;
+        let col = cos3(fac) * cos3(fac * 0.5);
+
+        Rgb::from_f32s(col.x, col.y, col.z)
+    }
+}
+
+pub struct PowerOffAnim {
+    /// Animation starting time.
+    pub start: Instant,
+}
+
+impl PowerOffAnim {
+    const FADE_FACTOR: f32 = 0.5;
+
+    /// Animation duration, in seconds.
+    const DURATION_SEC: u16 = 5;
+}
+
+impl Shader for PowerOffAnim {
+    fn sample(&self, time: Instant, (_, y): (f32, f32)) -> Rgb {
+        let time = time.as_millis().saturating_sub(self.start.as_millis());
+        let time = time as f32 / 1000.0;
+
+        let duration: f32 = Self::DURATION_SEC.into();
+        let r = Self::FADE_FACTOR * (duration - time - 1.0 + y);
+        Rgb::from_f32s(r, 0.0, 0.0)
+    }
+
+    fn end_time(&self) -> Option<Instant> {
+        Some(self.start + Duration::from_secs(Self::DURATION_SEC.into()))
+    }
+}
+
+pub struct PowerOnAnim {
+    /// Animation starting time.
+    pub start: Instant,
+}
+
+impl PowerOnAnim {
+    const FADE_FACTOR: f32 = 1.0;
+
+    /// Animation duration, in seconds.
+    const DURATION_SEC: u16 = 1;
+}
+
+fn cos3(v: Vec3) -> Vec3 {
+    vec3(cosf(v.x), cosf(v.y), cosf(v.z))
+}
+
+impl Shader for PowerOnAnim {
+    fn sample(&self, time: Instant, (_, y): (f32, f32)) -> Rgb {
+        let time = time.as_millis().saturating_sub(self.start.as_millis());
+        let time = time as f32 / 1000.0;
+
+        let duration: f32 = Self::DURATION_SEC.into();
+        let g = Self::FADE_FACTOR * (duration - time - y);
+        Rgb::from_f32s(0.0, g, 0.0)
+    }
+    fn end_time(&self) -> Option<Instant> {
+        Some(self.start + Duration::from_secs(Self::DURATION_SEC.into()))
+    }
+}

lib/src/logger.rs

@@ -0,0 +1,81 @@
+use core::{fmt::Arguments, sync::atomic::Ordering};
+
+use embassy_time::Instant;
+use log::{Level, Metadata, Record};
+use portable_atomic::AtomicBool;
+use static_cell::StaticCell;
+
+pub const LOGGER_OUTPUTS: usize = 2;
+
+/// A logger which timestamps logs and forwards them to mutiple other loggers.
+pub struct LogMultiplexer {
+    pub outputs: [&'static dyn LogOutput; LOGGER_OUTPUTS],
+}
+
+pub struct TimestampedRecord<'a> {
+    pub record: Record<'a>,
+
+    /// Timestamp
+    pub timestamp: Instant,
+}
+
+impl LogMultiplexer {
+    /// Set this as the global logger.
+    ///
+    /// Calling this function more than once does nothing.
+    pub fn init(self) {
+        // guard against calling this multiple times
+        static INITIALIZED: AtomicBool = AtomicBool::new(false);
+        if INITIALIZED.fetch_or(true, Ordering::SeqCst) {
+            return;
+        }
+
+        static LOGGER: StaticCell<LogMultiplexer> = StaticCell::new();
+        let logger = LOGGER.init(self);
+        unsafe {
+            log::set_logger_racy(logger).unwrap();
+            log::set_max_level_racy(log::LevelFilter::Debug);
+        }
+    }
+}
+
+impl log::Log for LogMultiplexer {
+    fn enabled(&self, _metadata: &Metadata) -> bool {
+        true
+    }
+
+    fn log(&self, record: &Record) {
+        if self.enabled(record.metadata()) {
+            let timestamp = Instant::now();
+
+            let record = TimestampedRecord {
+                timestamp,
+                record: record.clone(),
+            };
+
+            for output in &self.outputs {
+                output.log(&record);
+            }
+        }
+    }
+
+    fn flush(&self) {}
+}
+
+pub trait LogOutput: Send + Sync {
+    fn log(&self, record: &TimestampedRecord);
+}
+
+impl TimestampedRecord<'_> {
+    pub fn args(&self) -> &Arguments<'_> {
+        self.record.args()
+    }
+
+    pub fn level(&self) -> Level {
+        self.metadata().level()
+    }
+
+    pub fn metadata(&self) -> &Metadata<'_> {
+        self.record.metadata()
+    }
+}

lib/src/panic_handler.rs

@@ -0,0 +1,29 @@
+use core::{fmt::Write, panic::PanicInfo};
+
+use cortex_m::asm;
+use embassy_rp::gpio::{Level, Output};
+
+use crate::rtt::rtt_write;
+
+#[panic_handler]
+fn panic_blink(info: &PanicInfo) -> ! {
+    cortex_m::interrupt::disable();
+
+    let _ = write!(&mut Writer, "{info}");
+
+    // SAFETY: we panicked, so no other code will be running.
+    let p = unsafe { embassy_rp::Peripherals::steal() };
+    let _led = Output::new(p.PIN_11, Level::High);
+
+    asm::udf()
+}
+
+/// Write to RTT
+struct Writer;
+
+impl core::fmt::Write for Writer {
+    fn write_str(&mut self, s: &str) -> Result<(), core::fmt::Error> {
+        rtt_write(s);
+        Ok(())
+    }
+}

lib/src/rgb.rs

@@ -0,0 +1,85 @@
+use bytemuck::{cast_slice, Pod, Zeroable};
+use core::{
+    fmt::{self, Debug},
+    ops::{Div, Mul},
+};
+
+/// An Rgb value that can be safely transmuted to u32 for use with Ws2812.
+#[repr(transparent)]
+#[derive(Clone, Copy, PartialEq, Eq, Pod, Zeroable)]
+pub struct Rgb(u32);
+
+impl Rgb {
+    #[inline(always)]
+    pub const fn new(r: u8, g: u8, b: u8) -> Self {
+        Self(u32::from_be_bytes([g, r, b, 0]))
+    }
+
+    pub fn from_f64s(r: f64, g: f64, b: f64) -> Self {
+        let r = r.clamp(0.0, 1.0) * 255.0;
+        let g = g.clamp(0.0, 1.0) * 255.0;
+        let b = b.clamp(0.0, 1.0) * 255.0;
+        Self::new(r as u8, g as u8, b as u8)
+    }
+
+    pub fn from_f32s(r: f32, g: f32, b: f32) -> Self {
+        let r = r.clamp(0.0, 1.0) * 255.0;
+        let g = g.clamp(0.0, 1.0) * 255.0;
+        let b = b.clamp(0.0, 1.0) * 255.0;
+        Self::new(r as u8, g as u8, b as u8)
+    }
+
+    /// Get the red, green, and blue components of this Rgb.
+    #[inline(always)]
+    pub const fn components(&self) -> [u8; 3] {
+        let [g, r, b, _] = self.0.to_be_bytes();
+        [r, g, b]
+    }
+
+    #[inline(always)]
+    pub fn slice_as_u32s(rgbs: &[Rgb]) -> &[u32] {
+        cast_slice(rgbs)
+    }
+}
+
+impl Debug for Rgb {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let [r, g, b] = self.components();
+        f.debug_tuple("Rgb").field(&r).field(&g).field(&b).finish()
+    }
+}
+
+impl Div<u8> for Rgb {
+    type Output = Rgb;
+
+    fn div(self, d: u8) -> Self::Output {
+        let [r, g, b] = self.components();
+        Rgb::new(r / d, g / d, b / d)
+    }
+}
+
+impl Mul<f32> for Rgb {
+    type Output = Rgb;
+
+    fn mul(self, factor: f32) -> Self::Output {
+        let [r, g, b] = self.components();
+        Rgb::new(
+            ((r as f32) * factor) as u8,
+            ((g as f32) * factor) as u8,
+            ((b as f32) * factor) as u8,
+        )
+    }
+}
+
+#[cfg(all(target_arch = "x86_64", test))]
+mod tests {
+    use super::*;
+    use bytemuck::cast;
+
+    #[test]
+    fn test_rgb_as_u32() {
+        let rgb = Rgb::new(0x11, 0x22, 0xCC);
+        let rgb_u32: u32 = cast(rgb);
+        assert_eq!(rgb_u32, 0x2211CC00);
+    }
+}

lib/src/rtt.rs

@@ -0,0 +1,64 @@
+use core::{cell::RefCell, fmt::Write};
+
+use critical_section::Mutex;
+use rtt_target::{rtt_init, UpChannel};
+
+use crate::logger::{LogOutput, TimestampedRecord};
+
+pub type RttWriteFn = fn(&str);
+
+static CHANNEL: Mutex<RefCell<Option<UpChannel>>> = Mutex::new(RefCell::new(None));
+
+/// Write directly to the rtt output. Must call [init_rtt_logger] first.
+pub fn rtt_write(s: &str) {
+    critical_section::with(|cs| {
+        let mut slot = CHANNEL.borrow_ref_mut(cs);
+        if let Some(channel) = slot.as_mut() {
+            channel.write(s.as_bytes());
+        };
+    });
+}
+
+pub fn init_rtt_logger() -> &'static RttLogger {
+    let channels = rtt_init! {
+        up: {
+            0: {
+                size: 1024
+                mode: NoBlockSkip
+                name: "Terminal"
+            }
+        }
+    };
+
+    critical_section::with(|cs| {
+        let mut slot = CHANNEL.borrow_ref_mut(cs);
+
+        if slot.is_none() {
+            *slot = Some(channels.up.0);
+        }
+
+        static RTT_LOGGER: RttLogger = RttLogger;
+        &RTT_LOGGER
+    })
+}
+
+pub struct RttLogger;
+
+impl LogOutput for RttLogger {
+    fn log(&self, record: &TimestampedRecord) {
+        let s = record.timestamp.as_secs();
+        let ms = record.timestamp.as_millis() % 1000;
+        let level = record.level();
+        let mut w = &mut Writer;
+        let _ = writeln!(&mut w, "[{s}.{ms:04}] ({level}) {}", record.args());
+    }
+}
+
+struct Writer;
+
+impl Write for Writer {
+    fn write_str(&mut self, s: &str) -> Result<(), core::fmt::Error> {
+        rtt_write(s);
+        Ok(())
+    }
+}

lib/src/serial_proto.rs

@@ -0,0 +1,71 @@
+pub mod owned {
+    use alloc::string::String;
+    use msgpck::{MsgPack, MsgUnpack};
+
+    use crate::layer::Layers;
+
+    #[derive(Debug, MsgPack, MsgUnpack)]
+    pub struct LogRecord {
+        /// Milliseconds since boot
+        pub timestamp: u64,
+
+        pub level: String,
+
+        pub message: String,
+    }
+
+    /// Press the switch with the provided index.
+    #[derive(Debug, MsgPack, MsgUnpack)]
+    pub struct SwitchPress(pub u16);
+
+    /// Release the switch with the provided index.
+    #[derive(Debug, MsgPack, MsgUnpack)]
+    pub struct SwitchRelease(pub u16);
+
+    /// Change to the layer at the provided coordinates in the layer matrix.
+    #[derive(Debug, MsgPack, MsgUnpack)]
+    pub struct ChangeLayer {
+        pub x: u16,
+        pub y: u16,
+    }
+
+    #[derive(Debug, MsgPack, MsgUnpack)]
+    pub enum DeviceMsg {
+        Log(LogRecord),
+        SwitchPress(SwitchPress),
+        SwitchRelease(SwitchRelease),
+        ChangeLayer(ChangeLayer),
+        Layers(Layers),
+    }
+
+    #[derive(Debug, MsgPack, MsgUnpack)]
+    pub enum HostMsg {
+        GetLayers,
+    }
+}
+
+pub mod borrowed {
+    use msgpck::MsgPack;
+
+    use super::owned::*;
+    use crate::{layer::Layers, util::DisplayPack};
+
+    #[derive(Debug, MsgPack)]
+    pub struct LogRecord<'a> {
+        /// Milliseconds since boot
+        pub timestamp: u64,
+
+        pub level: DisplayPack<log::Level>,
+
+        pub message: DisplayPack<&'a core::fmt::Arguments<'a>>,
+    }
+
+    #[derive(Debug, MsgPack)]
+    pub enum DeviceMsg<'a> {
+        Log(LogRecord<'a>),
+        SwitchPress(SwitchPress),
+        SwitchRelease(SwitchRelease),
+        ChangeLayer(ChangeLayer),
+        Layers(&'a Layers),
+    }
+}

lib/src/uart.rs

@@ -0,0 +1,189 @@
+use core::mem::size_of;
+
+use bytemuck::{cast, AnyBitPattern, NoUninit};
+use crc_any::CRCu16;
+use embassy_executor::Spawner;
+use embassy_rp::peripherals::{PIN_0, PIN_1, UART0};
+use embassy_rp::uart::{self, BufferedUart, DataBits, Parity, StopBits};
+use embassy_sync::channel::Channel;
+use embassy_sync::pubsub::PubSubBehavior;
+use embedded_io_async::{Read, Write};
+use futures::{select_biased, FutureExt};
+use heapless::Vec;
+use serde::{Deserialize, Serialize};
+use static_cell::StaticCell;
+
+use crate::event::{switch, Half};
+use crate::interrupts::Irqs;
+use crate::keyboard::KbEvents;
+use crate::usb::{UsbEvent, USB_EVENTS};
+use crate::util::CS;
+
+/// Channel for [UsbEvent]s to be sent on the uart line.
+pub static UART_USB_EVENTS_OUT: Channel<CS, UsbEvent, 8> = Channel::new();
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+enum Message {
+    KeyboardEvent(switch::Event),
+    UsbEvent(UsbEvent),
+}
+
+pub async fn start(tx: PIN_0, rx: PIN_1, uart: UART0, board: Half, events: KbEvents) {
+    static TX_BUF: StaticCell<[u8; 256]> = StaticCell::new();
+    static RX_BUF: StaticCell<[u8; 256]> = StaticCell::new();
+
+    let mut config = uart::Config::default();
+    config.baudrate = 115200;
+    config.data_bits = DataBits::DataBits8;
+    config.stop_bits = StopBits::STOP1;
+    config.parity = Parity::ParityNone;
+
+    let uart = embassy_rp::uart::BufferedUart::new(
+        uart,
+        Irqs,
+        tx,
+        rx,
+        TX_BUF.init_with(|| [0u8; 256]),
+        RX_BUF.init_with(|| [0u8; 256]),
+        config,
+    );
+
+    Spawner::for_current_executor()
+        .await
+        .must_spawn(uart_task(uart, board, events))
+}
+
+#[embassy_executor::task]
+async fn uart_task(uart: BufferedUart<'static, UART0>, this_half: Half, mut events: KbEvents) {
+    let (mut rx, mut tx) = uart.split();
+    let (mut events_rx, mut events_tx) = events.split();
+
+    /// The header of a UART packet.
+    #[repr(C)]
+    #[derive(Clone, Copy, Debug, NoUninit, AnyBitPattern)]
+    struct Header {
+        /// The length of the payload.
+        len: u8,
+
+        /// An arbitrary value to feed the crc, should be different for each message.
+        random: u8,
+
+        /// A little-endian crc16.
+        crc: [u8; 2],
+    }
+
+    const HEADER_LEN: usize = size_of::<Header>();
+
+    let rx_task = async {
+        let mut buf: heapless::Vec<u8, 1024> = Vec::new();
+        loop {
+            if buf.len() >= HEADER_LEN {
+                let (&header, rest) = buf.split_first_chunk::<HEADER_LEN>().unwrap();
+                let header: Header = cast(header);
+                let crc = u16::from_le_bytes(header.crc);
+                let mut calculated_crc = CRCu16::crc16();
+                calculated_crc.digest(&[header.len, header.random]);
+                let calculated_crc = calculated_crc.get_crc();
+
+                if calculated_crc != crc {
+                    log::error!("invalid uart header crc: {header:x?}");
+                    buf.remove(0); // drop the first byte and hope we find a good packet header
+                    continue;
+                }
+
+                log::trace!(
+                    "reading from uart, header={header:?}, bytes_received={}",
+                    rest.len()
+                );
+
+                let len = usize::from(header.len);
+                if rest.len() >= len {
+                    let r = postcard::from_bytes(&rest[..len]);
+
+                    // drop packet from buffer
+                    buf.rotate_left(len + HEADER_LEN);
+                    buf.truncate(buf.len() - len - HEADER_LEN);
+
+                    let message: Message = match r {
+                        Ok(v) => v,
+                        Err(e) => {
+                            log::error!("failed to deserialize message: {e}");
+                            continue;
+                        }
+                    };
+
+                    match &message {
+                        Message::KeyboardEvent(event) => events_tx.send(event.clone()),
+                        &Message::UsbEvent(event) => USB_EVENTS.publish_immediate(event),
+                    }
+
+                    log::info!("got msg: {:?}", message);
+                }
+            }
+
+            let mut chunk = [0u8; 128];
+            let n = match rx.read(&mut chunk).await {
+                Ok(n) => n,
+                Err(e) => {
+                    log::error!("uart error: {:?}", e);
+                    continue;
+                }
+            };
+            if buf.extend_from_slice(&chunk[..n]).is_err() {
+                log::error!("uart buffer full");
+                buf.clear();
+            }
+        }
+    };
+
+    let tx_task = async {
+        let mut buf = [0u8; 256 + HEADER_LEN];
+        let mut counter = 0u8;
+
+        // forward messages to the other keyboard half
+        loop {
+            let message = select_biased! {
+                event = events_rx.recv().fuse() => {
+                    if event.source != this_half {
+                        continue; // do not forward messages from the other half back to it
+                    }
+                    Message::KeyboardEvent(event)
+                }
+                event = UART_USB_EVENTS_OUT.receive().fuse() => Message::UsbEvent(event),
+            };
+
+            let (buf_header, body) = buf.split_array_mut();
+            let serialized = match postcard::to_slice(&message, body) {
+                Ok(s) => s,
+                Err(e) => {
+                    log::error!("failed to serialize uart message: {e}");
+                    continue;
+                }
+            };
+
+            // add a "random" value to feed the crc
+            counter = counter.wrapping_add(1);
+            let random = counter;
+
+            let len = serialized.len() as u8;
+
+            let mut crc = CRCu16::crc16();
+            crc.digest(&[len, random]);
+            let header = Header {
+                len: serialized.len() as u8,
+                random,
+                crc: crc.get_crc().to_le_bytes(),
+            };
+            let header: [u8; HEADER_LEN] = cast(header);
+            *buf_header = header;
+
+            let package = &buf[..HEADER_LEN + usize::from(len)];
+            tx.write_all(package).await.ok();
+        }
+    };
+
+    select_biased! {
+        _ = tx_task.fuse() => log::error!("uart tx_task exited"),
+        _ = rx_task.fuse() => log::error!("eart rx_task exited"),
+    }
+}

lib/src/usb.rs

@@ -0,0 +1,136 @@
+use embassy_executor::Spawner;
+use embassy_rp::{peripherals::USB, usb::Driver};
+use embassy_sync::pubsub::{PubSubBehavior, PubSubChannel};
+use embassy_usb::{Builder, Config, Handler, UsbDevice};
+use serde::{Deserialize, Serialize};
+use static_cell::StaticCell;
+
+use crate::{interrupts::Irqs, keyboard::KbEvents, uart::UART_USB_EVENTS_OUT, util::CS};
+
+use self::serial::UsbSerial;
+
+pub mod keyboard;
+pub mod serial;
+
+pub const MAX_PACKET_SIZE: u8 = 64;
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub enum UsbEvent {
+    Enabled(bool),
+    Suspended(bool),
+    Configured(bool),
+    Addressed(u8),
+    Reset,
+}
+
+pub type UsbEventChannel = PubSubChannel<CS, UsbEvent, 8, 24, 0>;
+pub static USB_EVENTS: UsbEventChannel = UsbEventChannel::new();
+
+struct State {
+    device_descriptor: [u8; 256],
+    config_descriptor: [u8; 256],
+    bos_descriptor: [u8; 256],
+    msos_descriptor: [u8; 256],
+    control_buf: [u8; 64],
+    handler: UsbHandler,
+}
+
+static STATE: StaticCell<State> = StaticCell::new();
+
+pub async fn setup_logger_and_keyboard(usb: USB, events: KbEvents) -> &'static UsbSerial {
+    let mut builder = builder(usb);
+
+    let usb_serial = serial::setup(&mut builder).await;
+    keyboard::setup(&mut builder, events).await;
+
+    log::info!("building usb device");
+    let usb = builder.build();
+    log::info!("spawning usb task");
+    Spawner::for_current_executor().await.must_spawn(run(usb));
+
+    usb_serial
+}
+
+pub fn builder(usb: USB) -> Builder<'static, Driver<'static, USB>> {
+    // calling init here can't panic because this function can't be called
+    // twice since we are taking ownership of the only USB peripheral.
+    let state = STATE.init_with(|| State {
+        device_descriptor: [0; 256],
+        config_descriptor: [0; 256],
+        bos_descriptor: [0; 256],
+        msos_descriptor: [0; 256],
+        control_buf: [0; 64],
+        handler: UsbHandler,
+    });
+
+    // Create embassy-usb Config
+    let mut config = Config::new(0xb00b, 0x1355);
+    config.manufacturer = Some("Tux");
+    config.product = Some("Tangentbord1");
+    config.serial_number = Some("42069");
+    config.max_power = 100;
+    config.max_packet_size_0 = MAX_PACKET_SIZE;
+
+    // Required for windows compatiblity.
+    // https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.9.1/kconfig/CONFIG_CDC_ACM_IAD.html#help
+    config.device_class = 0xEF;
+    config.device_sub_class = 0x02;
+    config.device_protocol = 0x01;
+    config.composite_with_iads = true;
+
+    let driver = Driver::new(usb, Irqs);
+
+    let mut builder = Builder::new(
+        driver,
+        config,
+        &mut state.device_descriptor,
+        &mut state.config_descriptor,
+        &mut state.bos_descriptor,
+        &mut state.msos_descriptor,
+        &mut state.control_buf,
+    );
+
+    builder.handler(&mut state.handler);
+
+    builder
+}
+
+#[embassy_executor::task]
+pub async fn run(mut device: UsbDevice<'static, Driver<'static, USB>>) {
+    log::info!("running usb device");
+    device.run().await
+}
+
+struct UsbHandler;
+
+impl Handler for UsbHandler {
+    fn enabled(&mut self, enabled: bool) {
+        USB_EVENTS.publish_immediate(UsbEvent::Enabled(enabled));
+        let _ = UART_USB_EVENTS_OUT.try_send(UsbEvent::Enabled(enabled));
+        log::debug!("usb enabled({enabled})");
+    }
+
+    fn reset(&mut self) {
+        USB_EVENTS.publish_immediate(UsbEvent::Reset);
+        let _ = UART_USB_EVENTS_OUT.try_send(UsbEvent::Reset);
+        log::debug!("usb reset()");
+    }
+
+    fn addressed(&mut self, addr: u8) {
+        USB_EVENTS.publish_immediate(UsbEvent::Addressed(addr));
+        let _ = UART_USB_EVENTS_OUT.try_send(UsbEvent::Addressed(addr));
+        log::debug!("usb addressed({addr})");
+    }
+
+    fn configured(&mut self, configured: bool) {
+        USB_EVENTS.publish_immediate(UsbEvent::Configured(configured));
+        let _ = UART_USB_EVENTS_OUT.try_send(UsbEvent::Configured(configured));
+        log::debug!("usb configured({configured})");
+    }
+
+    fn suspended(&mut self, suspended: bool) {
+        USB_EVENTS.publish_immediate(UsbEvent::Suspended(suspended));
+        let _ = UART_USB_EVENTS_OUT.try_send(UsbEvent::Suspended(suspended));
+        log::debug!("usb suspended({suspended})");
+    }
+}

lib/src/usb/keyboard.rs

@@ -0,0 +1,242 @@
+pub mod report;
+
+use embassy_executor::Spawner;
+use embassy_futures::select::{select, Either};
+use embassy_rp::{peripherals::USB, usb::Driver};
+use embassy_sync::{
+    blocking_mutex::raw::NoopRawMutex,
+    mutex::Mutex,
+    pubsub::{subscriber::Sub, PubSubBehavior, PubSubChannel, WaitResult},
+    signal::Signal,
+};
+use embassy_time::{Duration, Timer};
+use embassy_usb::{
+    class::hid::{self, HidReaderWriter, ReadError, ReportId, RequestHandler},
+    control::OutResponse,
+    Builder,
+};
+use embassy_usb_driver::EndpointError;
+use log::error;
+use static_cell::StaticCell;
+use usbd_hid::descriptor::SerializedDescriptor;
+
+use crate::{
+    event::button,
+    keyboard::KbEvents,
+    keypress_handler::keypress_handler,
+    usb::keyboard::report::{KeyboardReport, EMPTY_KEYBOARD_REPORT},
+    util::CS,
+};
+
+use super::MAX_PACKET_SIZE;
+
+struct Handler;
+
+struct Reports {
+    /// The report to be sent to the host machine.
+    actual: KeyboardReport,
+
+    /// Key presses which hasn't been sent yet.
+    unsent: KeyboardReport,
+}
+
+struct Context {
+    reports: Mutex<CS, Reports>,
+
+    /// Signalled by [report_task] when a report is sent.
+    report_signal: Signal<CS, ()>,
+
+    handler: Handler,
+}
+
+/// Set up a USB HID keyboard. This function panics if called more than once.
+pub async fn setup(builder: &mut Builder<'static, Driver<'static, USB>>, events: KbEvents) {
+    log::info!("setting up usb hid");
+
+    let context = {
+        static CONTEXT: StaticCell<Context> = StaticCell::new();
+        // this panics if the functon is called twice
+        CONTEXT.init(Context {
+            reports: Mutex::new(Reports {
+                actual: EMPTY_KEYBOARD_REPORT,
+                unsent: EMPTY_KEYBOARD_REPORT,
+            }),
+            report_signal: Signal::new(),
+            handler: Handler,
+        })
+    };
+
+    let hid_state = {
+        static HID_STATE: StaticCell<hid::State<'static>> = StaticCell::new();
+        // this panics if the functon is called twice
+        HID_STATE.init(hid::State::new())
+    };
+
+    let config = hid::Config {
+        //report_descriptor: MouseReport::desc(),
+        report_descriptor: KeyboardReport::desc(),
+        request_handler: Some(&context.handler),
+        poll_ms: 2,
+        max_packet_size: MAX_PACKET_SIZE as u16,
+    };
+
+    let stream = HidStream::new(builder, hid_state, config);
+
+    let spawner = Spawner::for_current_executor().await;
+
+    spawner.must_spawn(report_task(stream, context));
+    spawner.must_spawn(event_listener_task(events, context));
+
+    log::info!("done setting up usb keyboard");
+}
+
+impl RequestHandler for Handler {
+    fn get_report(&self, id: ReportId, buf: &mut [u8]) -> Option<usize> {
+        log::info!("get_report({id:?}, {buf:?})");
+        let _ = (id, buf);
+        None
+    }
+
+    fn set_report(&self, id: ReportId, data: &[u8]) -> embassy_usb::control::OutResponse {
+        log::info!("set_report({id:?}, {data:?})");
+        let _ = (id, data);
+        OutResponse::Rejected
+    }
+
+    fn get_idle_ms(&self, id: Option<ReportId>) -> Option<u32> {
+        log::info!("get_idle_ms({id:?})");
+        let _ = id;
+        None
+    }
+
+    fn set_idle_ms(&self, id: Option<ReportId>, duration_ms: u32) {
+        log::info!("set_idle_ms({id:?}, {duration_ms})");
+        let _ = (id, duration_ms);
+    }
+}
+type HidStream = HidReaderWriter<'static, Driver<'static, USB>, 256, 256>;
+
+/// Capacity of the [button::Event] buffer in [event_listener_task]. A too small capacity may cause
+/// events to be dropped.
+pub const BUTTON_EVENT_BUF_LEN: usize = 32;
+
+#[embassy_executor::task]
+async fn event_listener_task(mut events: KbEvents, ctx: &'static Context) -> ! {
+    let button_events =
+        PubSubChannel::<NoopRawMutex, button::Event, BUTTON_EVENT_BUF_LEN, 1, 1>::new();
+    let mut button_pub = button_events.publisher().unwrap();
+    let mut button_sub = button_events.subscriber().unwrap();
+
+    let r = select(
+        button_events_to_report(ctx, &mut *button_sub),
+        keypress_handler(&mut *events.subscriber, &mut *button_pub),
+    )
+    .await;
+
+    // match hack because rust isn't smart enough.
+    match r {
+        Either::First(never) | Either::Second(never) => match never {},
+    }
+}
+
+/// Listen for [button::Event]s and add them to the keyboard [Reports].
+async fn button_events_to_report(
+    ctx: &'static Context,
+    button_sub: &mut Sub<'_, impl PubSubBehavior<button::Event>, button::Event>,
+) -> ! {
+    loop {
+        let WaitResult::Message(event) = button_sub.next_message().await else {
+            error!("lagged");
+            continue;
+        };
+
+        loop {
+            let mut r = ctx.reports.lock().await;
+            match event {
+                button::Event::PressKey(k) => {
+                    r.actual.press_key(k);
+                    r.unsent.press_key(k);
+                }
+                button::Event::PressMod(m) => {
+                    r.actual.press_modifier(m);
+                    r.unsent.press_modifier(m);
+                }
+
+                // we got a key release, but if the key press hasn't been sent yet, we
+                // wait for a bit until it has.
+                button::Event::ReleaseKey(k) if r.unsent.key_pressed(k) => {
+                    ctx.report_signal.reset();
+                    drop(r);
+                    ctx.report_signal.wait().await;
+                    continue;
+                }
+                button::Event::ReleaseMod(m) if r.unsent.modifier_pressed(m) => {
+                    ctx.report_signal.reset();
+                    drop(r);
+                    ctx.report_signal.wait().await;
+                    continue;
+                }
+
+                button::Event::ReleaseKey(k) => r.actual.release_key(k),
+                button::Event::ReleaseMod(m) => r.actual.release_modifier(m),
+
+                button::Event::Wait => {
+                    ctx.report_signal.reset();
+                    drop(r);
+                    ctx.report_signal.wait().await;
+                }
+            }
+            break;
+        }
+    }
+}
+
+#[embassy_executor::task]
+async fn report_task(stream: HidStream, ctx: &'static Context) {
+    if let Err(e) = write_reports(stream, ctx).await {
+        log::error!("keyboard error: {e:?}");
+    }
+}
+
+/// Write keyboard reports.
+async fn write_reports(mut stream: HidStream, ctx: &'static Context) -> Result<(), Error> {
+    stream.ready().await;
+    loop {
+        Timer::after(Duration::from_millis(2)).await;
+
+        let report = {
+            let mut reports = ctx.reports.lock().await;
+            ctx.report_signal.signal(());
+            reports.unsent = EMPTY_KEYBOARD_REPORT;
+            reports.actual
+        };
+
+        if report.keycodes != EMPTY_KEYBOARD_REPORT.keycodes {
+            log::trace!("keys: {:x?}", report.keycodes);
+        }
+
+        #[cfg(feature = "n-key-rollover")]
+        stream.write(report.as_bytes()).await?;
+
+        #[cfg(not(feature = "n-key-rollover"))]
+        stream.write_serialize(&report).await?;
+    }
+}
+
+#[derive(Debug)]
+#[allow(dead_code)]
+enum Error {
+    Read(ReadError),
+    Endpoint(EndpointError),
+}
+
+impl From<ReadError> for Error {
+    fn from(value: ReadError) -> Self {
+        Error::Read(value)
+    }
+}
+impl From<EndpointError> for Error {
+    fn from(value: EndpointError) -> Self {
+        Error::Endpoint(value)
+    }
+}

lib/src/usb/keyboard/report.rs

@@ -1,11 +1,15 @@
 #![allow(dead_code)]
 
+use crate::{button::Modifier, keys::Key};
+use bytemuck::{cast_ref, Pod, Zeroable};
+use core::mem::size_of;
+
 /// KeyboardReport describes a report and its companion descriptor that can be
 /// used to send keyboard button presses to a host and receive the status of the
 /// keyboard LEDs.
 ///
 /// Unlike usbd_hids KeyboardReport, this one supports N-key rollover.
-#[derive(Clone, PartialEq, Eq)]
+#[derive(Clone, Copy, PartialEq, Eq, Zeroable, Pod)]
 #[cfg(feature = "n-key-rollover")]
 #[repr(C, packed)]
 pub struct KeyboardReport {
@@ -15,9 +19,6 @@ pub struct KeyboardReport {
     pub keycodes: [u8; 27],
 }
 
-use core::mem::{size_of, transmute};
-use tgnt::{button::Modifier, keys::Key};
-
 #[cfg(not(feature = "n-key-rollover"))]
 pub use ::usbd_hid::descriptor::KeyboardReport;
 
@@ -35,23 +36,30 @@ pub const EMPTY_KEYBOARD_REPORT: KeyboardReport = KeyboardReport {
     keycodes: [0; 6],
 };
 
+/// Get the byte index, and the mask for that byte, in the keycode bitmap.
+fn key_to_byte_mask(key: Key) -> (usize, u8) {
+    let keycode = u8::from(key);
+    let byte = keycode >> 3;
+    let bit = keycode & 0b111;
+    let mask = 1 << bit;
+
+    (usize::from(byte), mask)
+}
+
 #[cfg(feature = "n-key-rollover")]
 impl KeyboardReport {
     #[inline(always)]
     pub fn set_key(&mut self, key: Key, pressed: bool) {
-        let keycode = u8::from(key);
+        let (byte_i, mask) = key_to_byte_mask(key);
-        let byte = keycode >> 3;
-        let bit = keycode & 0b111;
-        let mask = 1 << bit;
 
-        if let Some(k) = self.keycodes.get_mut(byte as usize) {
+        if let Some(k) = self.keycodes.get_mut(byte_i) {
             if pressed {
                 *k |= mask;
             } else {
                 *k &= !mask;
             }
         } else {
-            log::warn!("Tried to set out-of-range keycode: 0x{keycode:x}");
+            log::warn!("Tried to set out-of-range keycode: 0x{:x}", u8::from(key));
         }
     }
 
@@ -65,6 +73,17 @@ impl KeyboardReport {
         self.set_key(key, false)
     }
 
+    #[inline(always)]
+    pub fn key_pressed(&mut self, key: Key) -> bool {
+        let (byte_i, mask) = key_to_byte_mask(key);
+        if let Some(k) = self.keycodes.get_mut(byte_i) {
+            (*k & mask) != 0
+        } else {
+            log::warn!("Tried to get out-of-range keycode: 0x{:x}", u8::from(key));
+            false
+        }
+    }
+
     #[inline(always)]
     pub fn set_modifier(&mut self, modifier: Modifier, pressed: bool) {
         if pressed {
@@ -84,10 +103,14 @@ impl KeyboardReport {
         self.set_modifier(modifier, false)
     }
 
+    #[inline(always)]
+    pub fn modifier_pressed(&mut self, modifier: Modifier) -> bool {
+        (self.modifier & u8::from(modifier)) != 0
+    }
+
     #[inline(always)]
     pub fn as_bytes(&self) -> &[u8; size_of::<KeyboardReport>()] {
-        // SAFETY: KeyboardReport is repr(C, packed) and contains only u8s.
+        cast_ref(self)
-        unsafe { transmute(self) }
     }
 }
 

lib/src/usb/serial.rs

@@ -0,0 +1,219 @@
+use crate::{
+    logger::{LogOutput, TimestampedRecord},
+    serial_proto::borrowed::{DeviceMsg, LogRecord},
+    serial_proto::owned::HostMsg,
+    util::{DisplayPack, CS},
+};
+
+use super::MAX_PACKET_SIZE;
+use core::future::pending;
+use embassy_executor::Spawner;
+use embassy_rp::{peripherals::USB, usb::Driver};
+use embassy_sync::{channel::Channel, pipe::Pipe};
+use embassy_time::{Duration, Timer};
+use embassy_usb::{
+    class::cdc_acm::{self, CdcAcmClass},
+    Builder,
+};
+use embassy_usb_driver::EndpointError;
+use futures::{select_biased, FutureExt};
+use msgpck::{MsgPack, MsgUnpack, PackErr, UnpackErr};
+use static_cell::StaticCell;
+
+pub const BUFFER_SIZE: usize = 16 * 1024;
+static OUT: Pipe<CS, BUFFER_SIZE> = Pipe::new();
+pub static IN: Channel<CS, HostMsg, 16> = Channel::new(); // TODO: read from this guy
+
+#[derive(Clone)]
+pub struct UsbSerial;
+
+pub async fn setup(usb_builder: &mut Builder<'static, Driver<'static, USB>>) -> &'static UsbSerial {
+    let spawner = Spawner::for_current_executor().await;
+
+    static STATE: StaticCell<cdc_acm::State<'static>> = StaticCell::new();
+    let state = STATE.init(cdc_acm::State::new());
+
+    let class = CdcAcmClass::new(usb_builder, state, MAX_PACKET_SIZE as u16);
+
+    spawner.must_spawn(serial_task(class));
+
+    static USB_SERIAL: UsbSerial = UsbSerial;
+    &USB_SERIAL
+}
+
+async fn wait_connection(class: &mut CdcAcmClass<'static, Driver<'static, USB>>) {
+    class.wait_connection().await;
+    OUT.clear();
+}
+
+#[embassy_executor::task]
+async fn serial_task(mut class: CdcAcmClass<'static, Driver<'static, USB>>) {
+    let mut write_buf = [0u8; MAX_PACKET_SIZE as usize];
+    let mut read_buf = [0u8; 1024 as usize];
+    let mut message_parser = MessageParser::new(&mut read_buf);
+
+    class.wait_connection().await;
+    loop {
+        select_biased! {
+            n = OUT.read(&mut write_buf).fuse() => {
+                let write = async {
+                    class.write_packet(&write_buf[..n]).await?;
+
+                    // if we send a packet containing exactly MAX_PACKET_SIZE bytes, we need to send another
+                    // packet to "flush" the buffer.
+                    if OUT.len() == 0 && n == usize::from(MAX_PACKET_SIZE) {
+                        let _ = class.write_packet(&[]).await?;
+                    }
+
+                    Ok(())
+                };
+
+                match write.await {
+                    Ok(()) => {}
+                    Err(EndpointError::Disabled) => wait_connection(&mut class).await,
+                    Err(EndpointError::BufferOverflow) => {
+                        // not much we can do if this happens, just ignore the error
+                    }
+                }
+            }
+            //r = class.read_packet(&mut read_buf).fuse() => {
+            r = message_parser.read(&mut class).fuse() => {
+                match r {
+                    Ok(Some(message)) => {
+                        log::info!("Got message!!!: {:?}", message);
+                        if IN.try_send(message).is_err() {
+                            log::error!("USB serial in buffer is full");
+                        }
+                    }
+                    Ok(None) |
+                    Err(EndpointError::Disabled) => wait_connection(&mut class).await,
+                    Err(EndpointError::BufferOverflow) => {
+                        // wtf, this shouldn't happen?
+                        panic!("usb serial buffer overflow on read");
+                    }
+                }
+            }
+        }
+    }
+}
+
+/// Send a [DeviceMsg] over the serial connection.
+///
+/// If the OUT buffer is full, the message may be partially dropped.
+///
+/// If no serial connection is active, the message may not be ever be sent.
+pub fn serial_send(message: &DeviceMsg<'_>) {
+    struct UsbWriter;
+    impl msgpck::Write for UsbWriter {
+        fn write_all(&mut self, bytes: &[u8]) -> Result<(), PackErr> {
+            OUT.try_write(bytes).map_err(|_| PackErr::BufferOverflow)?;
+            Ok(())
+        }
+    }
+
+    let _ = message.pack_with_writer(&mut UsbWriter);
+}
+
+impl LogOutput for UsbSerial {
+    fn log(&self, record: &TimestampedRecord) {
+        let ms = record.timestamp.as_millis();
+        let level = record.metadata().level();
+
+        let record = LogRecord {
+            timestamp: ms,
+            level: DisplayPack(level),
+            message: DisplayPack(record.args()),
+        };
+
+        serial_send(&DeviceMsg::Log(record));
+    }
+}
+
+pub struct MessageParser<'a> {
+    pub buf: &'a mut [u8],
+    pub len: usize,
+}
+
+impl<'buf> MessageParser<'buf> {
+    pub fn new(buf: &'buf mut [u8]) -> Self {
+        Self { buf, len: 0 }
+    }
+
+    pub async fn read(
+        &mut self,
+        class: &mut CdcAcmClass<'static, Driver<'static, USB>>,
+    ) -> Result<Option<HostMsg>, EndpointError> {
+        loop {
+            // try to parse messages from the buffer
+            if self.len > 0 {
+                log::debug!("buf: {:x?}", &self.buf[..self.len]);
+            }
+            let mut reader = &mut &self.buf[..self.len];
+            match HostMsg::unpack(&mut reader) {
+                Ok(r) => {
+                    // remove the decoded bytes from buf
+                    if reader.is_empty() {
+                        self.len = 0;
+                    } else {
+                        let bytes_read = self.len - reader.len();
+                        self.buf.rotate_left(bytes_read);
+                        self.len -= bytes_read;
+                    }
+
+                    log::debug!("received message: {r:?}");
+
+                    return Ok(Some(r));
+                }
+
+                // we probably have not gotten the entire message yet, go back to reading bytes.
+                // if the message is corrupted, we will eventually hit MESSAGE_TIMEOUT or
+                // max buffer size.
+                Err(UnpackErr::UnexpectedEof) => {}
+
+                // on any other error, the message is corrupt. clear the buffer.
+                Err(_e) => {
+                    log::error!("{:?}", _e);
+                    self.len = 0;
+                }
+            };
+
+            // if buffer is not empty, this future will sleep until the pending message times out
+            let buf_is_empty = self.len == 0;
+            let timeout = async {
+                if buf_is_empty {
+                    pending().await
+                } else {
+                    const MESSAGE_TIMEOUT: Duration = Duration::from_millis(30);
+                    Timer::after(MESSAGE_TIMEOUT).await
+                }
+            };
+
+            // try to read some bytes from the file
+            let n = select_biased! {
+                n = class.read_packet(&mut self.buf[self.len..]).fuse() => n?,
+                _ = timeout.fuse() => {
+                    log::debug!("clearing buffer");
+                    self.len = 0;
+                    continue;
+                }
+            };
+
+            // make sure we're not just reading garbage forever
+            if self.len >= self.buf.len() {
+                log::debug!("max message size exceeded");
+                self.len = 0;
+                continue;
+            }
+
+            self.len += n;
+
+            log::info!("read {} bytes, buf: {:x?}", n, &self.buf[..self.len]);
+
+            // exit on eof
+            if n == 0 {
+                log::error!("read 0 bytes, fuck.");
+                return Ok(None);
+            }
+        }
+    }
+}

lib/src/util.rs

@@ -0,0 +1,214 @@
+use core::{
+    cell::UnsafeCell,
+    fmt::{self, Debug, Display, Write},
+    mem::MaybeUninit,
+    ops::Deref,
+};
+
+use embassy_futures::yield_now;
+use embassy_sync::blocking_mutex::raw::CriticalSectionRawMutex;
+use embassy_time::{Duration, Timer};
+use msgpck::{Marker, MsgPack, PackErr, Piece};
+use portable_atomic::{AtomicU32, Ordering};
+
+use crate::rgb::Rgb;
+
+pub type CS = CriticalSectionRawMutex;
+
+#[derive()]
+pub struct SwapCell<T> {
+    // active_slot: 1 bit
+    // readers: 31 bits
+    entries: AtomicU32,
+    exits: AtomicU32,
+
+    slot0: UnsafeCell<MaybeUninit<T>>,
+    slot1: UnsafeCell<MaybeUninit<T>>,
+}
+
+pub struct SwapCellWrite<T: 'static> {
+    cell: &'static SwapCell<T>,
+}
+
+#[derive(Clone)]
+pub struct SwapCellRead<T: 'static> {
+    cell: &'static SwapCell<T>,
+}
+
+pub struct SwapCellGuard<'a, T> {
+    cell: &'a SwapCell<T>,
+    slot: &'a T,
+}
+
+const SLOT_MASK: u32 = 0x80000000;
+const ENTRIES_MASK: u32 = 0x7FFFFFFF;
+
+impl<T> SwapCell<T> {
+    pub const fn new(initial: T) -> Self {
+        SwapCell {
+            entries: AtomicU32::new(0),
+            exits: AtomicU32::new(0),
+            slot0: UnsafeCell::new(MaybeUninit::new(initial)),
+            slot1: UnsafeCell::new(MaybeUninit::uninit()),
+        }
+    }
+
+    pub fn split(&'static mut self) -> (SwapCellRead<T>, SwapCellWrite<T>) {
+        (SwapCellRead { cell: self }, SwapCellWrite { cell: self })
+    }
+}
+
+impl<T> SwapCellWrite<T> {
+    pub async fn write(&mut self, t: T) {
+        let x = self.cell.entries.load(Ordering::SeqCst);
+        let active_slot = (x & SLOT_MASK).rotate_left(1) as usize;
+
+        let mut slots = [&self.cell.slot0, &self.cell.slot1];
+        slots.rotate_left(active_slot);
+        let [active_slot, inactive_slot] = slots;
+
+        // SAFETY: no one elase is allowed to touch the inactive slot.
+        unsafe { inactive_slot.get().write(MaybeUninit::new(t)) };
+
+        // swap active/inactive slots
+        let x = self.cell.entries.fetch_xor(SLOT_MASK, Ordering::SeqCst);
+        let (_active_slot, inactive_slot) = (inactive_slot, active_slot);
+
+        // wait until there are no more readers in the previously active slot
+        let entries = x & ENTRIES_MASK;
+        loop {
+            let exits = self.cell.exits.load(Ordering::SeqCst);
+            if exits >= entries {
+                break;
+            }
+
+            yield_now().await;
+        }
+
+        // drop the now inactive slot
+        // SAFETY: we waited until everyone else stopped using this slot.
+        unsafe { inactive_slot.get().drop_in_place() };
+    }
+}
+
+impl<T> SwapCellRead<T> {
+    pub fn read(&self) -> SwapCellGuard<'_, T> {
+        let x = self.cell.entries.fetch_add(1, Ordering::SeqCst);
+
+        let entries = x & ENTRIES_MASK;
+        debug_assert!(entries < ENTRIES_MASK, "SwapCell overflowed");
+
+        let slot = (x & SLOT_MASK).rotate_left(1) as usize;
+        let slot = [&self.cell.slot0, &self.cell.slot1][slot];
+        let slot = unsafe { &*slot.get() };
+        let slot = unsafe { slot.assume_init_ref() };
+
+        SwapCellGuard {
+            cell: self.cell,
+            slot,
+        }
+    }
+}
+
+impl<T> Drop for SwapCellGuard<'_, T> {
+    fn drop(&mut self) {
+        self.cell.exits.fetch_add(1, Ordering::SeqCst);
+    }
+}
+
+impl<T> Deref for SwapCellGuard<'_, T> {
+    type Target = T;
+
+    fn deref(&self) -> &Self::Target {
+        self.slot
+    }
+}
+
+pub async fn stall() -> ! {
+    loop {
+        Timer::after(Duration::from_secs(1)).await;
+    }
+}
+
+/// Input a value 0 to 255 to get a color value
+// The colours are a transition r - g - b - back to r.
+pub fn wheel(mut wheel_pos: u8) -> Rgb {
+    wheel_pos = 255 - wheel_pos;
+    if wheel_pos < 85 {
+        Rgb::new(255 - wheel_pos * 3, 0, wheel_pos * 3)
+    } else if wheel_pos < 170 {
+        wheel_pos -= 85;
+        Rgb::new(0, wheel_pos * 3, 255 - wheel_pos * 3)
+    } else {
+        wheel_pos -= 170;
+        Rgb::new(wheel_pos * 3, 255 - wheel_pos * 3, 0)
+    }
+}
+
+/// Calculate the length of the formatted string of a type that impls Display.
+pub fn display_len(t: &impl Display) -> usize {
+    // impl fmt::Write for a dummy struct that just increments a length
+    struct Write<'a>(&'a mut usize);
+    impl fmt::Write for Write<'_> {
+        fn write_str(&mut self, s: &str) -> fmt::Result {
+            *self.0 += s.len();
+            Ok(())
+        }
+    }
+
+    let mut n = 0;
+
+    let mut w = Write(&mut n);
+    write!(&mut w, "{}", t).expect("Write impl is infallible");
+
+    n
+}
+
+/// Wrapper type that impls [MsgPack] for `T: Display`, by serializing `T` as a msgpck string.
+pub struct DisplayPack<T>(pub T);
+impl<T: Display> MsgPack for DisplayPack<T> {
+    fn pack(&self) -> impl Iterator<Item = msgpck::Piece<'_>> {
+        "TODO".pack()
+        //let len = display_len(&self.0) as u32;
+
+        //[msgpck::Marker::Str32.into(), len.into()]
+        //    .into_iter()
+        //    .chain(iter::from_fn(move || None)) // TODO
+    }
+
+    fn pack_with_writer(&self, w: &mut dyn msgpck::Write) -> Result<usize, PackErr> {
+        let mut n = 0;
+
+        let str_len = display_len(&self.0);
+
+        for bytes in [
+            Piece::from(Marker::Str32).as_bytes(),
+            Piece::from(str_len as u32).as_bytes(),
+        ] {
+            w.write_all(bytes)?;
+            n += bytes.len();
+        }
+
+        // this is advanced stupid.
+        struct Write<'a>(&'a mut dyn msgpck::Write);
+        impl fmt::Write for Write<'_> {
+            fn write_str(&mut self, s: &str) -> fmt::Result {
+                self.0
+                    .write_all(s.as_bytes())
+                    .map_err(|_| fmt::Error::default())?;
+                Ok(())
+            }
+        }
+
+        write!(&mut Write(w), "{}", self.0).map_err(|_| PackErr::BufferOverflow)?;
+        n += str_len;
+
+        Ok(n)
+    }
+}
+
+impl<T: Debug> Debug for DisplayPack<T> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        Debug::fmt(&self.0, f)
+    }
+}

lib/src/ws2812.rs

@@ -0,0 +1,92 @@
+use embassy_rp::dma::{self, AnyChannel};
+use embassy_rp::interrupt::typelevel::Binding;
+use embassy_rp::pio::{self, FifoJoin, Instance, Pio, PioPin, ShiftConfig, ShiftDirection};
+use embassy_rp::{Peripheral, PeripheralRef};
+use fixed::FixedU32;
+
+use crate::rgb::Rgb;
+
+pub struct Ws2812<P: pio::Instance + 'static> {
+    sm: pio::StateMachine<'static, P, 0>,
+    dma: PeripheralRef<'static, AnyChannel>,
+}
+
+impl<P: Instance> Ws2812<P> {
+    pub fn new(
+        pio: impl Peripheral<P = P> + 'static,
+        irqs: impl Binding<P::Interrupt, pio::InterruptHandler<P>>,
+        dma: impl dma::Channel,
+        pin: impl PioPin,
+    ) -> Self {
+        let mut pio = Pio::new(pio, irqs);
+        let mut sm = pio.sm0;
+        // prepare the PIO program
+        let side_set = ::pio::SideSet::new(false, 1, false);
+        let mut a: ::pio::Assembler<32> = ::pio::Assembler::new_with_side_set(side_set);
+
+        const T1: u8 = 2; // start bit
+        const T2: u8 = 5; // data bit
+        const T3: u8 = 3; // stop bit
+        const CYCLES_PER_BIT: u32 = (T1 + T2 + T3) as u32;
+
+        let mut wrap_target = a.label();
+        let mut wrap_source = a.label();
+        let mut do_zero = a.label();
+        a.set_with_side_set(::pio::SetDestination::PINDIRS, 1, 0);
+        a.bind(&mut wrap_target);
+        // Do stop bit
+        a.out_with_delay_and_side_set(::pio::OutDestination::X, 1, T3 - 1, 0);
+        // Do start bit
+        a.jmp_with_delay_and_side_set(::pio::JmpCondition::XIsZero, &mut do_zero, T1 - 1, 1);
+        // Do data bit = 1
+        a.jmp_with_delay_and_side_set(::pio::JmpCondition::Always, &mut wrap_target, T2 - 1, 1);
+        a.bind(&mut do_zero);
+        // Do data bit = 0
+        a.nop_with_delay_and_side_set(T2 - 1, 0);
+        a.bind(&mut wrap_source);
+
+        let prg = a.assemble_with_wrap(wrap_source, wrap_target);
+
+        //let relocated_prg = RelocatedProgram::new(&prg);
+        let loaded_prg = pio.common.load_program(&prg);
+
+        // Clock config
+        // TODO CLOCK_FREQ should come from embassy_rp
+        const CLOCK_FREQ: u32 = 125_000_000;
+        const WS2812_FREQ: u32 = 800_000;
+
+        let bit_freq = WS2812_FREQ * CYCLES_PER_BIT;
+        let mut int = CLOCK_FREQ / bit_freq;
+        let rem = CLOCK_FREQ - (int * bit_freq);
+        let frac = (rem * 256) / bit_freq;
+        // 65536.0 is represented as 0 in the pio's clock divider
+        if int == 65536 {
+            int = 0;
+        }
+
+        let mut config = pio::Config::default();
+        config.clock_divider = FixedU32::from_bits((int << 8) | frac);
+        config.fifo_join = FifoJoin::TxOnly;
+        config.shift_out = ShiftConfig {
+            threshold: 24,
+            direction: ShiftDirection::Left,
+            auto_fill: true,
+        };
+        let out_pin = pio.common.make_pio_pin(pin);
+        config.set_set_pins(&[&out_pin]);
+        config.use_program(&loaded_prg, &[&out_pin]);
+
+        sm.set_config(&config);
+        sm.set_enable(true);
+
+        Self {
+            sm,
+            dma: PeripheralRef::new(dma.degrade()),
+        }
+    }
+
+    pub async fn write(&mut self, colors: &[Rgb]) {
+        let colors = Rgb::slice_as_u32s(colors);
+        self.sm.tx().dma_push(self.dma.reborrow(), colors).await;
+    }
+}

right/.cargo/config.toml

@@ -0,0 +1,2 @@
+[build]
+target = "thumbv6m-none-eabi"

right/Cargo.toml

@@ -0,0 +1,28 @@
+[package]
+name = "tangentbord1-right"
+version = "0.1.0"
+authors = ["Joakim Hulthe <joakim@hulthe.net>"]
+description = "Keyboard firmware"
+edition = "2021"
+
+[dependencies.tangentbord1]
+path = "../lib"
+package = "tangentbord1-lib"
+
+[dependencies]
+cortex-m-rt = "0.7"
+embassy-rp = { version = "0.1.0", features = ["time-driver", "critical-section-impl"] }
+embassy-executor = { version = "0.5.0", features = ["nightly", "executor-thread", "integrated-timers", "arch-cortex-m"] }
+embassy-sync = "0.5.0"
+embassy-time = "0.3.0"
+embassy-futures = "0.1.1"
+log = "0.4.17"
+postcard = { version = "1.0.4", features = ["alloc"] }
+
+[build-dependencies]
+ron = "0.8.0"
+postcard = { version = "1", features = ["use-std"] }
+
+[build-dependencies.tangentbord1]
+path = "../lib"
+package = "tangentbord1-lib"

right/build.rs

@@ -0,0 +1,59 @@
+//! This build script copies the `memory.x` file from the crate root into
+//! a directory where the linker can always find it at build time.
+//! For many projects this is optional, as the linker always searches the
+//! project root directory -- wherever `Cargo.toml` is. However, if you
+//! are using a workspace or have a more complicated build setup, this
+//! build script becomes required. Additionally, by requesting that
+//! Cargo re-run the build script whenever `memory.x` is changed,
+//! updating `memory.x` ensures a rebuild of the application with the
+//! new memory settings.
+
+use std::fs::File;
+use std::io::Write;
+use std::path::PathBuf;
+use std::{env, fs};
+
+use tangentbord1::layer::Layer;
+
+fn main() {
+    memory();
+    serialize_layout("./layers.ron", "./src/layers.pc");
+}
+
+fn memory() {
+    // Put `memory.x` in our output directory and ensure it's
+    // on the linker search path.
+    let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
+    File::create(out.join("memory.x"))
+        .unwrap()
+        .write_all(include_bytes!("../memory.x"))
+        .unwrap();
+    println!("cargo:rustc-link-search={}", out.display());
+
+    // By default, Cargo will re-run a build script whenever
+    // any file in the project changes. By specifying `memory.x`
+    // here, we ensure the build script is only re-run when
+    // `memory.x` is changed.
+    println!("cargo:rerun-if-changed=../memory.x");
+
+    // --nmagic turns off page alignment of sections (which saves flash space)
+    println!("cargo:rustc-link-arg-bins=--nmagic");
+
+    println!("cargo:rustc-link-arg-bins=-Tlink.x");
+    println!("cargo:rustc-link-arg-bins=-Tlink-rp.x");
+    //println!("cargo:rustc-link-arg-bins=-Tdefmt.x");
+}
+
+fn serialize_layout(ron_path: &str, postcard_path: &str) {
+    println!("cargo:rerun-if-changed={ron_path}");
+
+    let layers = fs::read_to_string(ron_path).expect("Failed to read .ron");
+    let layers: Vec<Vec<Layer>> = ron::from_str(&layers).expect("Failed to deserialize .ron");
+
+    let serialized = postcard::to_stdvec(&layers).expect("Failed to serialize layers");
+
+    File::create(postcard_path)
+        .expect("Failed to create .pc")
+        .write_all(&serialized)
+        .expect("Failed to write .pc");
+}

right/layers.ron

@@ -0,0 +1,181 @@
+[
+	[
+		Layer(
+			buttons: [
+				// Row 1
+				Key(F),
+				Key(G),
+				Key(C),
+				Key(R),
+				Key(L),
+
+				// Row 2
+				Key(D),
+				ModTap(H, RCtrl),
+				ModTap(T, RShift),
+				ModTap(N, RMod),
+				ModTap(S, RAlt),
+
+				// Row 3
+				Key(B),
+				Key(M),
+				Key(W),
+				Key(V),
+				Key(Z),
+
+				// Thumbpad
+				Layer(Peek, Right, 1),
+				Key(Return),
+				Key(Delete),
+			],
+		),
+		Layer(
+			buttons: [
+				// Row 1
+				Compose2(Lower, O, Variable, A), // å
+				Key(D7),
+				Key(D8),
+				Key(D9),
+				Key(D0),
+
+				// Row 2
+				Compose2(Upper, Apostrophe, Variable, A), // ä
+				ModTap(D4, RCtrl),
+				ModTap(D5, RShift),
+				ModTap(D6, RMod),
+				//ModTap(, RAlt),
+				Mod(RAlt),
+
+				// Row 3
+				Compose2(Upper, Apostrophe, Variable, O), // ö
+				Key(D1),
+				Key(D2),
+				Key(D3),
+				None,
+
+				// Thumbpad
+				Layer(Peek, Right, 1),
+				Key(Return),
+				Key(Delete),
+			],
+		),
+		Layer(
+			buttons: [
+				// Row 1
+				None,
+				Key(Mute),
+				Key(VolumeDown),
+				Key(VolumeUp),
+				Layer(Move, Down, 1),
+
+				// Row 2
+				Key(LeftArrow),
+				Key(DownArrow),
+				Key(UpArrow),
+				Key(RightArrow),
+				None,
+
+				// Row 3
+				Key(Home),
+				Key(PageDown),
+				Key(PageUp),
+				Key(End),
+				None,
+
+				// Thumbpad
+				Layer(Peek, Right, 1),
+				Key(Return),
+				Key(Delete),
+			],
+		),
+	],
+	[ // gaming row
+		Layer(
+			buttons: [
+				// Row 1
+				Key(Y),
+				Key(U),
+				Key(I),
+				Key(O),
+				Key(P),
+
+				// Row 2
+				Key(H),
+				Key(J),
+				Key(K),
+				Key(L),
+				Key(G),
+
+				// Row 3
+				Key(B),
+				Key(N),
+				Key(M),
+				Key(Comma),
+				Key(Period),
+
+				// Thumbpad
+				Layer(Peek, Right, 1),
+				Key(Return),
+				Key(Delete),
+			],
+		),
+		Layer(
+			buttons: [
+				// Row 1
+				None,
+				None,
+				Key(CapsLock),
+				Key(Tab),
+				None,
+
+				// Row 2
+				None,
+				None,
+				None,
+				None,
+				None,
+
+				// Row 3
+				None,
+				None,
+				None,
+				None,
+				None,
+
+				// Thumbpad
+				Layer(Peek, Right, 1),
+				Key(Return),
+				Key(Delete),
+			],
+		),
+		Layer(
+			buttons: [
+				// Row 1
+				None,
+				None,
+				None,
+				None,
+				Layer(Move, Up, 1),
+
+				// Row 2
+				None,
+				None,
+				None,
+				None,
+				None,
+
+				// Row 3
+				None,
+				None,
+				None,
+				None,
+				None,
+
+				// Thumbpad
+				Layer(Peek, Right, 1),
+				Key(Return),
+				Key(Delete),
+			],
+		),
+	],
+]

right/src/main.rs

@@ -0,0 +1,113 @@
+//! Firmware for Tangentbord1, right half.
+
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+extern crate alloc;
+extern crate cortex_m_rt;
+
+use alloc::vec::Vec;
+use embassy_executor::Spawner;
+use embassy_rp::gpio::{Level, Output, Pin};
+use embassy_time::Timer;
+use log::error;
+use tangentbord1::{
+    board::Board,
+    event::Half,
+    interrupts::Irqs,
+    keyboard::KeyboardConfig,
+    layer::Layer,
+    logger::LogMultiplexer,
+    rgb::Rgb,
+    util::stall,
+    ws2812::Ws2812,
+    {allocator, rtt, uart, usb},
+};
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let half = Half::Right;
+
+    let rtt_logger = rtt::init_rtt_logger();
+
+    allocator::init();
+
+    let p = embassy_rp::init(Default::default());
+    let board = Board::from(p);
+
+    let _neopixel_power = Output::new(board.neopixel_power, Level::High);
+
+    let mut neopixel = Ws2812::new(board.PIO0, Irqs, board.DMA_CH0, board.neopixel);
+    let neopixels_d5 = Ws2812::new(board.PIO1, Irqs, board.DMA_CH1, board.d5);
+
+    neopixel.write(&[Rgb::new(0xFF, 0x00, 0x00)]).await;
+
+    let layers = include_bytes!("layers.pc");
+    let Ok(layers): Result<Vec<Vec<Layer>>, _> = postcard::from_bytes(layers) else {
+        log::error!("Failed to deserialize layer config");
+        stall().await
+    };
+
+    let keyboard = KeyboardConfig {
+        half,
+        pins: [
+            // row 1
+            board.d12.degrade(),
+            board.d11.degrade(),
+            board.d10.degrade(),
+            board.d9.degrade(),
+            board.d7.degrade(),
+            // row 2
+            board.a2.degrade(),
+            board.a1.degrade(),
+            board.a0.degrade(),
+            board.sda.degrade(),
+            board.scl.degrade(),
+            // row 3
+            board.mosi.degrade(),
+            board.sck.degrade(),
+            board.d25.degrade(),
+            board.d24.degrade(),
+            board.a3.degrade(),
+            // thumbpad
+            board.d3.degrade(),
+            board.d2.degrade(),
+            board.miso.degrade(),
+        ],
+        led_map: [0, 1, 2, 3, 4, 9, 8, 7, 6, 5, 10, 11, 12, 13, 14, 15, 16, 17],
+        led_driver: neopixels_d5,
+        layers,
+    };
+
+    let Some([events1, events2]) = keyboard.create().await else {
+        error!("failed to create keyboard");
+        return;
+    };
+
+    uart::start(board.tx, board.rx, board.UART0, half, events2).await;
+
+    // TODO: delaying the logger until here is not ideal
+    let usb_logger = usb::setup_logger_and_keyboard(board.USB, events1).await;
+
+    let logger = LogMultiplexer {
+        outputs: [rtt_logger, usb_logger],
+    };
+    logger.init();
+
+    log::error!("log_level: error");
+    log::warn!("log_level: warn");
+    log::info!("log_level: info");
+    log::debug!("log_level: debug");
+    log::trace!("log_level: trace");
+
+    neopixel.write(&[Rgb::new(0x00, 0x00, 0xFF)]).await;
+    Timer::after_secs(5).await;
+
+    for b in (0u8..0xff).rev() {
+        neopixel.write(&[Rgb::new(0, 0, b)]).await;
+        Timer::after_millis(10).await;
+    }
+
+    stall().await
+}

run

@@ -1,19 +1,26 @@
-#!/bin/sh
+#!/usr/bin/env nu
 
-set -e
+# Build, flash, and run the firmware.
+#
+# Will also attach to serial logs
+def main [
+	bin: string # Which firmware to run, 'left' or 'right'.
+	--serial (-s): string # The serial device to get logs from.
+	--probe (-p): bool # Flash & run using probe-run instead of elf2uf2
+] {
+	if $probe == true {
+		cargo build --bin $bin
+		probe-run --chip RP2040 --speed 4000 ("./target/thumbv6m-none-eabi/debug/" + $bin)
+	} else {
+		cargo run --bin $bin
+	}
 
-cargo run --bin $1
+	let log_script = ($env.FILE_PWD | path join "serial-logs")
 
-printf "waiting for serial log"
+	if $serial == null {
+		nu $log_script
+	} else {
+		nu $log_script --serial $serial
+	}
+}
 
-SERIAL=/dev/ttyACM0
-while [ ! -e $SERIAL ]
-do
-	printf "."
-	sleep 1
-done
-echo
-
-sleep 1
-
-cat $SERIAL

rust-toolchain.toml

@@ -1,4 +1,4 @@
 [toolchain]
-channel = "nightly-2023-02-01"
+channel = "nightly-2024-02-01"
 components = ["rust-std", "rust-src", "rustfmt", "cargo", "clippy"]
 targets = ["thumbv6m-none-eabi"]

schematic/.gitignore

@@ -17,6 +17,12 @@ _autosave-*
 *-save.kicad_pcb
 fp-info-cache
 
+# Gerber- & Drillfiles
+*.gbr
+*.gbrjob
+*.drl
+*.zip
+
 # Netlist files (exported from Eeschema)
 *.net
 

schematic/pcb_right/tangentbord1-right.kicad_pcb

@@ -1589,9 +1589,9 @@
     (pad "" np_thru_hole circle (at -4.75 0) (size 1.6 1.6) (drill 1.6) (layers "F&B.Cu" "*.Mask") (tstamp 4ef9163a-607f-4c16-ba07-039ed3c9a178))
     (pad "" np_thru_hole circle (at 2.25 0) (size 1.6 1.6) (drill 1.6) (layers "F&B.Cu" "*.Mask") (tstamp 4d5d0edd-f7c9-4099-8b76-1fe6539cd315))
     (pad "R1" smd rect (at -0.15 -3.25) (size 1.2 2.5) (layers "F.Cu" "F.Paste" "F.Mask")
-      (net 28 "/RX") (pintype "passive") (tstamp c1f0e596-c9ea-4fc4-94cb-42bfcdbf078f))
+      (net 29 "/TX") (pintype "passive") (tstamp c1f0e596-c9ea-4fc4-94cb-42bfcdbf078f))
     (pad "R2" smd rect (at -3.15 -3.25) (size 1.2 2.5) (layers "F.Cu" "F.Paste" "F.Mask")
-      (net 29 "/TX") (pintype "passive") (tstamp b5ea9e55-dd5f-4fd9-824b-933f1a2993cc))
+      (net 28 "/RX") (pintype "passive") (tstamp b5ea9e55-dd5f-4fd9-824b-933f1a2993cc))
     (pad "S" smd rect (at 4.95 3.25) (size 1.2 2.5) (layers "F.Cu" "F.Paste" "F.Mask")
       (net 1 "GND") (pintype "passive") (tstamp b272ec82-9723-4dde-bb98-36cdd8b785f6))
     (pad "T" smd rect (at 3.85 -3.25) (size 1.2 2.5) (layers "F.Cu" "F.Paste" "F.Mask")
@@ -5847,30 +5847,31 @@
   (segment (start 77.136396 45) (end 80.636396 41.5) (width 0.25) (layer "B.Cu") (net 27) (tstamp 96085405-d09c-4171-af0f-7c144dec03cf))
   (segment (start 132 40.5) (end 139.142 47.642) (width 0.25) (layer "B.Cu") (net 27) (tstamp a094ca3f-357b-4f11-b63a-18a36964edb4))
   (segment (start 101 38) (end 117 38) (width 0.25) (layer "B.Cu") (net 27) (tstamp c657351f-21db-4a82-9d4e-a4b18388e41b))
-  (segment (start 34.6 72.75) (end 35.25 72.75) (width 0.25) (layer "F.Cu") (net 28) (tstamp 2aecbfc7-ff0a-4003-b8bb-0af4755158e1))
+  (segment (start 32.75 71.6) (end 31.6 72.75) (width 0.25) (layer "F.Cu") (net 28) (tstamp 257d91be-ba3e-4c65-a2dc-d0b8c6ff460e))
-  (segment (start 35.25 72.75) (end 36 72) (width 0.25) (layer "F.Cu") (net 28) (tstamp 92911de8-3a23-4b4f-96b9-46b91c3bce7f))
+  (segment (start 32.75 71) (end 32.75 71.6) (width 0.25) (layer "F.Cu") (net 28) (tstamp c611b538-e729-44f3-8bca-31f31edb2fd3))
   (segment (start 48.74 70.76) (end 48.5 71) (width 0.25) (layer "F.Cu") (net 28) (tstamp de259030-01a2-4071-94bc-39f7ef7d2749))
   (segment (start 48.74 63.52) (end 48.74 70.76) (width 0.25) (layer "F.Cu") (net 28) (tstamp e48b1469-3af2-4118-9bc5-9e5c37c94163))
-  (via (at 36 72) (size 0.8) (drill 0.4) (layers "F.Cu" "B.Cu") (net 28) (tstamp 878bff88-e36a-4f24-a538-a4b52aa7d7e0))
+  (via (at 32.75 71) (size 0.8) (drill 0.4) (layers "F.Cu" "B.Cu") (net 28) (tstamp 0a82a331-2d2b-4f04-9dcf-9a403b395a28))
   (via (at 48.5 71) (size 0.8) (drill 0.4) (layers "F.Cu" "B.Cu") (net 28) (tstamp ebcacad5-955c-4c4f-8978-1a135b18c83f))
-  (segment (start 36 72) (end 37 71) (width 0.25) (layer "B.Cu") (net 28) (tstamp 32b66a24-bed2-40ca-8c77-fc574ad69eb9))
   (segment (start 46.5 71) (end 37 71) (width 0.25) (layer "B.Cu") (net 28) (tstamp 4a5a63b9-3924-4d58-9b5d-a611ce3e3167))
   (segment (start 47.800305 71.725) (end 47.199695 71.725) (width 0.25) (layer "B.Cu") (net 28) (tstamp 4d4eef30-5c7a-426c-8b81-b3f88f8efe9c))
   (segment (start 48.5 71) (end 48.5 71.025305) (width 0.25) (layer "B.Cu") (net 28) (tstamp 4f3a45aa-140a-4a61-a8cd-54aabe5401d5))
   (segment (start 48.74 63.52) (end 51.28 63.52) (width 0.25) (layer "B.Cu") (net 28) (tstamp 5cf03d53-3dcf-4352-a586-d34a50742a03))
+  (segment (start 37 71) (end 32.75 71) (width 0.25) (layer "B.Cu") (net 28) (tstamp 5dabcd76-b7d6-48f1-8c8e-cca58a79a12e))
   (segment (start 48.5 71.025305) (end 47.800305 71.725) (width 0.25) (layer "B.Cu") (net 28) (tstamp bc5b52e8-ce44-425c-8735-a816f74ea50e))
   (segment (start 46.5 71.025305) (end 46.5 71) (width 0.25) (layer "B.Cu") (net 28) (tstamp f17f6ff6-e9b0-49eb-be28-46887e686fb7))
   (segment (start 47.199695 71.725) (end 46.5 71.025305) (width 0.25) (layer "B.Cu") (net 28) (tstamp fe3d94be-7f6b-4326-a169-590e775626c3))
-  (segment (start 31.6 71.4) (end 32.5 70.5) (width 0.25) (layer "F.Cu") (net 29) (tstamp 439e4474-2835-4e39-8928-78eb9cf36d68))
   (segment (start 47.475 62.245) (end 48.74 60.98) (width 0.25) (layer "F.Cu") (net 29) (tstamp 6cda5ff2-ccee-40cb-bfc0-3cf6a723164e))
   (segment (start 47.475 62.245) (end 47.475 70.975) (width 0.25) (layer "F.Cu") (net 29) (tstamp a57d3b54-bc08-45e5-9b51-7f33dab65a8f))
+  (segment (start 34.6 70.4) (end 34.6 72.75) (width 0.25) (layer "F.Cu") (net 29) (tstamp bd02cff6-e2e4-4c46-ac64-4b693c23d326))
   (segment (start 47.475 70.975) (end 47.5 71) (width 0.25) (layer "F.Cu") (net 29) (tstamp cd6b777f-10ca-467b-9eeb-3c4c6834ad9d))
-  (segment (start 31.6 72.75) (end 31.6 71.4) (width 0.25) (layer "F.Cu") (net 29) (tstamp d8660258-e773-4a0e-90ee-4e11a0774814))
+  (segment (start 34.75 70.25) (end 34.6 70.4) (width 0.25) (layer "F.Cu") (net 29) (tstamp de022714-9ff9-4605-8b63-77ce8ad6b1da))
   (via (at 47.5 71) (size 0.8) (drill 0.4) (layers "F.Cu" "B.Cu") (net 29) (tstamp 5dbd696e-afc2-4ea2-b4f6-d4be983e5e15))
-  (via (at 32.5 70.5) (size 0.8) (drill 0.4) (layers "F.Cu" "B.Cu") (net 29) (tstamp bd2abb3c-6b02-45db-b7d7-7813beeae0c7))
+  (via (at 34.75 70.25) (size 0.8) (drill 0.4) (layers "F.Cu" "B.Cu") (net 29) (tstamp edd6d0ee-811e-47b1-a25e-a8dea186bd79))
   (segment (start 51.28 60.98) (end 48.74 60.98) (width 0.25) (layer "B.Cu") (net 29) (tstamp 18785f4e-d358-42c8-a146-e286295d644f))
+  (segment (start 47 70.5) (end 35 70.5) (width 0.25) (layer "B.Cu") (net 29) (tstamp 90296410-b0aa-4ba3-9747-539dca0c5653))
   (segment (start 47.5 71) (end 47 70.5) (width 0.25) (layer "B.Cu") (net 29) (tstamp a4993e91-f6f3-4cee-89fb-438274989758))
-  (segment (start 32.5 70.5) (end 47 70.5) (width 0.25) (layer "B.Cu") (net 29) (tstamp b2f38454-648b-4c69-a719-9f743dee5c67))
+  (segment (start 35 70.5) (end 34.75 70.25) (width 0.25) (layer "B.Cu") (net 29) (tstamp f07f7ef7-7b0f-45db-b1c6-0d97add181ed))
   (segment (start 92.5 80) (end 93.5 79) (width 0.25) (layer "B.Cu") (net 30) (tstamp 028b37a0-0fa2-4168-9364-43f54ea11158))
   (segment (start 33.5 60.98) (end 30.96 60.98) (width 0.25) (layer "B.Cu") (net 30) (tstamp 040d2626-2565-4f78-b962-e33c60eadf75))
   (segment (start 29.5 71.5) (end 31.5 73.5) (width 0.25) (layer "B.Cu") (net 30) (tstamp 252b4023-5bb1-48af-9179-bbbd954b5c0b))
@@ -6907,6 +6908,26 @@
         (xy 32.650889 74.246204)
         (xy 32.701989 74.109201)
         (xy 32.7085 74.048638)
+        (xy 32.7085 72.589595)
+        (xy 32.718091 72.541377)
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+        (xy 33.157015 72.092001)
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+        (xy 33.273654 71.967796)
+        (xy 33.323569 71.935235)
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+        (xy 33.438276 71.951195)
+        (xy 33.477406 71.996147)
+        (xy 33.4915 72.054053)
         (xy 33.4915 74.048638)
         (xy 33.498011 74.109201)
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@@ -6977,7 +6998,7 @@
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         (xy 39.446205 71.049111)
-        (xy 39.377702 71.023561)
+        (xy 39.375777 71.022843)
         (xy 39.309201 70.998011)
         (xy 39.248638 70.9915)
         (xy 37.951362 70.9915)
@@ -6985,99 +7006,88 @@
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         (xy 37.636738 71.136738)
         (xy 37.549111 71.253794)
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         (xy 37.4915 74.048638)
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+        (xy 32.010958 70.463057)
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+        (xy 31.915472 70.628443)
-        (xy 32.404513 69.5915)
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-        (xy 32.279978 69.61797)
+        (xy 31.852823 70.844651)
-        (xy 32.217711 69.631206)
+        (xy 31.850508 70.866688)
-        (xy 32.043246 69.708883)
+        (xy 31.849248 70.878672)
-        (xy 31.888747 69.821133)
+        (xy 31.828396 70.935959)
-        (xy 31.760958 69.963057)
+        (xy 31.783091 70.976752)
-        (xy 31.665472 70.128443)
+        (xy 31.723938 70.9915)
-        (xy 31.606458 70.31007)
-        (xy 31.589093 70.475291)
-        (xy 31.577509 70.516365)
-        (xy 31.552878 70.551215)
-        (xy 31.211336 70.892757)
-        (xy 31.195017 70.905832)
-        (xy 31.169146 70.933382)
-        (xy 31.152133 70.9515)
-        (xy 31.151895 70.951753)
-        (xy 31.110086 70.981137)
-        (xy 31.060045 70.9915)
         (xy 30.951362 70.9915)
         (xy 30.890799 70.998011)
         (xy 30.753794 71.049111)
         (xy 30.636738 71.136738)
         (xy 30.549111 71.253794)
-        (xy 30.499717 71.386224)
+        (xy 30.498888 71.388448)
         (xy 30.498011 71.390799)
         (xy 30.4915 71.451362)
         (xy 30.4915 74.048638)
@@ -7215,7 +7225,7 @@
         (xy 47.119104 72.140743)
         (xy 47.120096 72.134477)
         (xy 47.122504 72.122853)
-        (xy 47.129385 72.096056)
+        (xy 47.130426 72.092)
         (xy 47.1335 72.08003)
         (xy 47.1335 72.059776)
         (xy 47.135051 72.040066)
@@ -7378,7 +7388,7 @@
         (xy 71.974006 73.026528)
         (xy 71.910202 72.897145)
         (xy 71.749908 72.657248)
-        (xy 71.661965 72.556969)
+        (xy 71.648292 72.541377)
         (xy 71.559673 72.440326)
         (xy 71.342749 72.250089)
         (xy 71.102855 72.089797)
@@ -7389,16 +7399,16 @@
         (xy 69.712097 71.813158)
         (xy 69.429117 71.869447)
         (xy 69.155914 71.962186)
-        (xy 68.978135 72.049858)
+        (xy 68.996292 72.040904)
         (xy 68.897145 72.089798)
-        (xy 68.861915 72.113338)
+        (xy 68.871031 72.107247)
         (xy 68.833774 72.132141)
         (xy 68.778778 72.152478)
         (xy 68.720533 72.145723)
         (xy 68.671652 72.113338)
         (xy 68.642721 72.062337)
         (xy 68.640005 72.003764)
-        (xy 68.640723 72)
+        (xy 68.641458 71.996147)
         (xy 68.683641 71.77502)
         (xy 68.70346 71.46)
         (xy 68.683641 71.14498)
@@ -7424,7 +7434,7 @@
         (xy 68.624495 70.834928)
         (xy 68.526956 70.534734)
         (xy 68.392562 70.249131)
-        (xy 68.31731 70.130553)
+        (xy 68.333403 70.155911)
         (xy 68.223434 69.982627)
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         (xy 67.792139 69.523345)
@@ -7493,14 +7503,14 @@
         (xy 83.843221 70.582184)
         (xy 84.119821 70.734247)
         (xy 84.413298 70.850443)
-        (xy 84.573804 70.891653)
+        (xy 84.537346 70.882293)
         (xy 84.719024 70.92894)
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         (xy 85.032179 70.9685)
         (xy 85.347821 70.9685)
         (xy 85.347824 70.9685)
         (xy 85.660975 70.92894)
-        (xy 85.76359 70.902593)
+        (xy 85.703751 70.917957)
         (xy 85.966702 70.850443)
         (xy 86.260179 70.734247)
         (xy 86.536779 70.582184)
@@ -7794,7 +7804,7 @@
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         (xy 109.967262 71.068164)
         (xy 109.890594 70.953433)
-        (xy 109.857156 70.919999)
+        (xy 109.870541 70.933382)
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@@ -7821,7 +7831,7 @@
         (xy 91.205711 71)
         (xy 91.186841 70.712097)
         (xy 91.130553 70.42912)
-        (xy 91.090141 70.31007)
+        (xy 91.093897 70.321134)
         (xy 91.037813 70.155914)
         (xy 90.958417 69.994915)
         (xy 90.910202 69.897145)
@@ -8051,7 +8061,7 @@
         (xy 108 70.205711)
         (xy 108.287903 70.186841)
         (xy 108.57088 70.130553)
-        (xy 108.754721 70.068147)
+        (xy 108.778516 70.06007)
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         (xy 109.102856 69.910202)
@@ -8076,14 +8086,14 @@
         (xy 121.843221 70.582184)
         (xy 122.119821 70.734247)
         (xy 122.413298 70.850443)
-        (xy 122.573804 70.891653)
+        (xy 122.537346 70.882293)
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         (xy 123.032179 70.9685)
         (xy 123.347821 70.9685)
         (xy 123.347824 70.9685)
         (xy 123.660975 70.92894)
-        (xy 123.76359 70.902593)
+        (xy 123.703751 70.917957)
         (xy 123.966702 70.850443)
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         (xy 124.536779 70.582184)
@@ -8165,7 +8175,7 @@
         (xy 129.200468 70.92)
         (xy 129.186841 70.712097)
         (xy 129.130553 70.42912)
-        (xy 129.090141 70.31007)
+        (xy 129.093897 70.321134)
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         (xy 128.958417 69.994915)
         (xy 128.910202 69.897145)
@@ -11098,7 +11108,7 @@
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         (xy 45.705414 71.643504)
         (xy 45.705413 71.643505)
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         (xy 45.248659 71.975356)
@@ -11117,8 +11127,8 @@
         (xy 44.739041 71.187557)
         (xy 44.660658 71.100504)
         (xy 44.611253 71.045634)
-        (xy 44.599292 71.036944)
+        (xy 44.548443 71)
-        (xy 44.521232 70.98023)
+        (xy 44.511947 70.973484)
         (xy 44.456752 70.933382)
         (xy 44.368251 70.893979)
         (xy 44.328863 70.866399)

schematic/pcb_right/tangentbord1-right.kicad_sch

@@ -862,7 +862,7 @@
     (effects (font (size 1.27 1.27)) (justify left bottom))
     (uuid 083bb491-0977-432e-acc8-a4698c0afad2)
   )
-  (label "RX" (at 80.01 111.76 0) (fields_autoplaced)
+  (label "RX" (at 80.01 109.22 0) (fields_autoplaced)
     (effects (font (size 1.27 1.27)) (justify left bottom))
     (uuid 0a1a64ee-6eb8-49a4-ad91-7a1ebc48e4ef)
   )
@@ -890,7 +890,7 @@
     (effects (font (size 1.27 1.27)) (justify left bottom))
     (uuid 36b8996b-7d3e-4977-ba5a-db3904739724)
   )
-  (label "TX" (at 80.01 109.22 0) (fields_autoplaced)
+  (label "TX" (at 80.01 111.76 0) (fields_autoplaced)
     (effects (font (size 1.27 1.27)) (justify left bottom))
     (uuid 3a56c460-dc5f-48bf-ab4e-c1d328b684a8)
   )

serial-logs

@@ -0,0 +1,37 @@
+#!/usr/bin/env nu
+
+let level_colors = {
+	TRACE: (ansi m)
+	DEBUG: (ansi c)
+	INFO: (ansi g)
+	WARN: (ansi y)
+	ERROR: (ansi rb)
+}
+
+# Attach to serial logs of a running firmware
+def main [
+	--serial (-s): string # The serial device to get logs from.
+] {
+	let serial = if $serial == null {
+		"/dev/serial/by-id/usb-Tux_Tangentbord1_42069-if00"
+	} else {
+		$serial
+	}
+
+	print -n ("waiting for serial log " + $serial)
+
+	while not ($serial | path exists) {
+		print -n "."
+		sleep 500ms
+	}
+	echo
+
+	cat $serial |
+		parse -r '\[(?<timestamp>[0-9\.]*)\] \((?<level>\w*)\) (?<message>.*)' |
+		each { |it|
+			print -n "[" (ansi d) $it.timestamp (ansi reset) "] "
+			print -n "(" ($level_colors | get $it.level) $it.level (ansi reset) ") "
+			print $it.message
+		}
+}
+

src/bin/.gitignore

@@ -1 +0,0 @@
-*.pc

src/bin/left.rs

@@ -1,88 +0,0 @@
-//! Firmware for Tangentbord1, left half.
-
-#![no_std]
-#![no_main]
-#![feature(type_alias_impl_trait)]
-
-extern crate alloc;
-extern crate cortex_m_rt;
-
-use alloc::vec::Vec;
-use embassy_executor::Spawner;
-use embassy_rp::gpio::{Level, Output, Pin};
-use embassy_time::{Duration, Timer};
-use tangentbord1::board::Board;
-use tangentbord1::keyboard::KeyboardConfig;
-use tangentbord1::util::{stall, wheel};
-use tangentbord1::ws2812::{Rgb, Ws2812};
-use tangentbord1::{allocator, usb};
-use tgnt::layer::Layer;
-
-#[embassy_executor::main]
-async fn main(_spawner: Spawner) {
-    allocator::init();
-
-    let p = embassy_rp::init(Default::default());
-    let board = Board::from(p);
-
-    let _led = Output::new(board.d13, Level::High);
-    let _neopixel_power = Output::new(board.neopixel_power, Level::High);
-
-    let mut neopixel = Ws2812::new(board.PIO0, board.DMA_CH0, board.neopixel.degrade());
-    let mut neopixels_d5 = Ws2812::new(board.PIO1, board.DMA_CH1, board.d5.degrade());
-
-    neopixel.write(&[Rgb::new(0xFF, 0x00, 0x00)]).await;
-    usb::setup_logger_and_keyboard(board.USB).await;
-    neopixel.write(&[Rgb::new(0x00, 0x00, 0xFF)]).await;
-
-    //Timer::after(Duration::from_millis(3000)).await;
-
-    let layers = include_bytes!("layers-left.pc");
-    let Ok(layers): Result<Vec<Layer>, _> = postcard::from_bytes(layers) else {
-        log::error!("Failed to deserialize layer config");
-        stall().await
-    };
-
-    let keyboard = KeyboardConfig {
-        layers,
-        pins: [
-            // row 1
-            board.d24.degrade(),
-            board.a3.degrade(),
-            board.a2.degrade(),
-            board.a1.degrade(),
-            board.a0.degrade(),
-            // row 2
-            board.d25.degrade(),
-            board.sck.degrade(),
-            board.mosi.degrade(),
-            board.miso.degrade(),
-            board.d2.degrade(),
-            // row 3
-            board.d12.degrade(),
-            board.d11.degrade(),
-            board.d10.degrade(),
-            board.d9.degrade(),
-            board.d3.degrade(),
-            // thumbpad
-            board.d7.degrade(),
-            board.scl.degrade(),
-            board.sda.degrade(),
-        ],
-    };
-
-    keyboard.create().await;
-
-    for w in 0usize.. {
-        neopixel.write(&[wheel(w as u8)]).await;
-        neopixels_d5
-            .write(&[
-                wheel((w + 50) as u8),
-                wheel((w + 100) as u8),
-                wheel((w + 150) as u8),
-                wheel((w + 200) as u8),
-            ])
-            .await;
-        Timer::after(Duration::from_millis(10)).await;
-    }
-}

src/bin/right.rs

@@ -1,89 +0,0 @@
-//! Firmware for Tangentbord1, right half.
-
-#![no_std]
-#![no_main]
-#![feature(type_alias_impl_trait)]
-
-extern crate alloc;
-extern crate cortex_m_rt;
-
-use alloc::vec::Vec;
-use embassy_executor::Spawner;
-use embassy_rp::gpio::{Level, Output, Pin};
-use embassy_time::{Duration, Timer};
-use tangentbord1::board::Board;
-use tangentbord1::keyboard::KeyboardConfig;
-use tangentbord1::util::{stall, wheel};
-use tangentbord1::ws2812::{Rgb, Ws2812};
-use tangentbord1::{allocator, usb};
-use tgnt::layer::Layer;
-
-#[embassy_executor::main]
-async fn main(_spawner: Spawner) {
-    allocator::init();
-
-    let p = embassy_rp::init(Default::default());
-    let board = Board::from(p);
-
-    let _led = Output::new(board.d13, Level::High);
-    let _neopixel_power = Output::new(board.neopixel_power, Level::High);
-
-    let mut neopixel = Ws2812::new(board.PIO0, board.DMA_CH0, board.neopixel.degrade());
-    let mut neopixels_d5 = Ws2812::new(board.PIO1, board.DMA_CH1, board.d5.degrade());
-
-    neopixel.write(&[Rgb::new(0xFF, 0x00, 0x00)]).await;
-    usb::setup_logger_and_keyboard(board.USB).await;
-    neopixel.write(&[Rgb::new(0x00, 0x00, 0xFF)]).await;
-
-    //Timer::after(Duration::from_millis(3000)).await;
-
-    let layers = include_bytes!("layers-right.pc");
-    let Ok(layers): Result<Vec<Layer>, _> = postcard::from_bytes(layers) else {
-        log::error!("Failed to deserialize layer config");
-        stall().await
-    };
-
-    let keyboard = KeyboardConfig {
-        layers,
-        pins: [
-            // TODO: reconfigure these for right PCB
-            // row 1
-            board.d24.degrade(),
-            board.a3.degrade(),
-            board.a2.degrade(),
-            board.a1.degrade(),
-            board.a0.degrade(),
-            // row 2
-            board.d25.degrade(),
-            board.sck.degrade(),
-            board.mosi.degrade(),
-            board.miso.degrade(),
-            board.d2.degrade(),
-            // row 3
-            board.d12.degrade(),
-            board.d11.degrade(),
-            board.d10.degrade(),
-            board.d9.degrade(),
-            board.d3.degrade(),
-            // thumbpad
-            board.d7.degrade(),
-            board.scl.degrade(),
-            board.sda.degrade(),
-        ],
-    };
-
-    keyboard.create().await;
-
-    for w in 0usize.. {
-        neopixel.write(&[wheel(w as u8)]).await;
-        neopixels_d5
-            .write(&[
-                wheel((w + 50) as u8),
-                wheel((w + 100) as u8),
-                wheel((w + 150) as u8),
-                wheel((w + 200) as u8),
-            ])
-            .await;
-        Timer::after(Duration::from_millis(10)).await;
-    }
-}

src/keyboard.rs

@@ -1,191 +0,0 @@
-use core::sync::atomic::{AtomicU16, Ordering};
-
-use alloc::{boxed::Box, vec::Vec};
-use embassy_executor::Spawner;
-use embassy_rp::gpio::{AnyPin, Input, Pin, Pull};
-use embassy_time::{Duration, Timer};
-use futures::{select_biased, FutureExt};
-use log::{debug, error, info, warn};
-use tgnt::{button::Button, layer::Layer};
-
-use crate::usb::keyboard::KB_REPORT;
-
-static CURRENT_LAYER: AtomicU16 = AtomicU16::new(0);
-
-pub struct KeyboardConfig {
-    pub pins: [AnyPin; SWITCH_COUNT],
-    pub layers: Vec<Layer>,
-}
-
-impl KeyboardConfig {
-    pub async fn create(self) {
-        let spawner = Spawner::for_current_executor().await;
-
-        if self.layers.is_empty() {
-            error!("no layers defined");
-            return;
-        }
-
-        info!(
-            "setting up keyboard layout with {} layer(s)",
-            self.layers.len()
-        );
-
-        let layers = Box::leak(self.layers.into_boxed_slice());
-        for (i, layer) in layers.iter().enumerate() {
-            if layer.buttons.len() != SWITCH_COUNT {
-                warn!(
-                    "layer {i} defines {} buttons, but there are {SWITCH_COUNT} switches",
-                    layer.buttons.len(),
-                )
-            }
-        }
-
-        for (i, pin) in self.pins.into_iter().enumerate() {
-            if spawner.spawn(switch_task(i, pin, layers)).is_err() {
-                error!("failed to spawn switch task, pool_size mismatch?");
-                break;
-            }
-        }
-    }
-}
-
-const MOD_TAP_TIME: Duration = Duration::from_millis(100);
-const SWITCH_COUNT: usize = 18;
-
-/// Task for monitoring a single switch pin, and handling button presses.
-#[embassy_executor::task(pool_size = 18)]
-async fn switch_task(switch_num: usize, pin: AnyPin, layers: &'static [Layer]) -> ! {
-    let _pin_nr = pin.pin();
-    let mut pin = Input::new(pin, Pull::Up);
-    loop {
-        // pins are pull-up, so when the switch is pressed they are brought low.
-        pin.wait_for_low().await;
-
-        // TODO: do we need debouncing?
-
-        // get current layer
-        let mut current_layer = CURRENT_LAYER.load(Ordering::Relaxed);
-        let layer_count = layers.len() as u16;
-        if current_layer >= layer_count {
-            error!("current layer was out of bounds for some reason ({current_layer})");
-            current_layer = 0;
-        }
-        let Some(Layer { buttons }) = layers.get(usize::from(current_layer)) else {
-            error!("current layer was out of bounds for some reason ({current_layer})");
-            CURRENT_LAYER.store(0, Ordering::Relaxed);
-            continue;
-        };
-
-        // and current button
-        let Some(button) = buttons.get(switch_num) else {
-            warn!("no button defined for switch {switch_num}");
-            continue;
-        };
-
-        debug!("switch {switch_num} button {button:?} pressed");
-
-        let wait_for_release = async {
-            pin.wait_for_high().await;
-            debug!("switch {switch_num} button {button:?} released");
-        };
-
-        match button {
-            &Button::Key(key) => {
-                KB_REPORT.lock().await.press_key(key);
-                wait_for_release.await;
-                KB_REPORT.lock().await.release_key(key);
-                continue;
-            }
-            &Button::Mod(modifier) => {
-                KB_REPORT.lock().await.press_modifier(modifier);
-                wait_for_release.await;
-                KB_REPORT.lock().await.release_modifier(modifier);
-                continue;
-            }
-            &Button::ModTap { keycode, modifier } => {
-                select_biased! {
-                    _ = Timer::after(MOD_TAP_TIME).fuse() => {
-                        KB_REPORT.lock().await.press_modifier(modifier);
-                        pin.wait_for_high().await;
-                        KB_REPORT.lock().await.release_modifier(modifier);
-                        debug!("switch {switch_num} button {button:?} released");
-                        continue;
-                    }
-                    _ = wait_for_release.fuse() => {
-                        KB_REPORT.lock().await.press_key(keycode);
-                        Timer::after(Duration::from_millis(10)).await;
-                        KB_REPORT.lock().await.release_key(keycode);
-                        continue;
-                    }
-                }
-            }
-            Button::NextLayer => {
-                let next_layer = (current_layer + 1) % layer_count;
-                CURRENT_LAYER.store(next_layer, Ordering::Relaxed);
-                debug!("switched to layer {next_layer}");
-            }
-            Button::PrevLayer => {
-                let prev_layer = current_layer.checked_sub(1).unwrap_or(layer_count - 1);
-                CURRENT_LAYER.store(prev_layer, Ordering::Relaxed);
-                debug!("switched to layer {prev_layer}");
-            }
-            Button::None => {}
-        }
-
-        wait_for_release.await;
-    }
-}
-
-/// Random functions for testing
-#[allow(dead_code)]
-pub mod test {
-    use tgnt::{button::Button, keys::Key};
-
-    pub fn letter_to_key(c: char) -> Button {
-        if !c.is_ascii() {
-            return Button::None;
-        }
-
-        let c = c.to_ascii_uppercase();
-
-        let key = match c {
-            'A' => Key::A,
-            'B' => Key::B,
-            'C' => Key::C,
-            'D' => Key::D,
-            'E' => Key::E,
-            'F' => Key::F,
-            'G' => Key::G,
-            'H' => Key::H,
-            'I' => Key::I,
-            'J' => Key::J,
-            'K' => Key::K,
-            'L' => Key::L,
-            'M' => Key::M,
-            'N' => Key::N,
-            'O' => Key::O,
-            'P' => Key::P,
-            'Q' => Key::Q,
-            'R' => Key::R,
-            'S' => Key::S,
-            'T' => Key::T,
-            'U' => Key::U,
-            'V' => Key::V,
-            'W' => Key::W,
-            'X' => Key::X,
-            'Y' => Key::Y,
-            'Z' => Key::Z,
-            ' ' => Key::Space,
-            '\n' => Key::Return,
-            _ => {
-                log::info!("char {c:?} -> None");
-                return Button::None;
-            }
-        };
-
-        log::info!("char {c:?} -> {key:?}");
-
-        Button::Key(key)
-    }
-}

src/lib.rs

@@ -1,13 +0,0 @@
-#![no_std]
-#![feature(type_alias_impl_trait)]
-
-extern crate alloc;
-
-pub mod allocator;
-pub mod board;
-pub mod keyboard;
-pub mod neopixel;
-pub mod panic_handler;
-pub mod usb;
-pub mod util;
-pub mod ws2812;

src/neopixel.pio

@@ -1,11 +0,0 @@
-.program ws2812
-.side_set 1
-.wrap_target
-bitloop:
-   out x 1        side 0 [6]; Drive low. Side-set still takes place before instruction stalls.
-   jmp !x do_zero side 1 [3]; Branch on the bit we shifted out previous delay. Drive high.
- do_one:
-   jmp  bitloop   side 1 [4]; Continue driving high, for a one (long pulse)
- do_zero:
-   nop            side 0 [4]; Or drive low, for a zero (short pulse)
-.wrap

src/neopixel.rs

@@ -1,122 +0,0 @@
-/*
-use embassy_rp::{
-    gpio::{AnyPin, Drive, SlewRate},
-    peripherals::{DMA_CH0, PIO0},
-    pio::{FifoJoin, PioPeripheral, PioStateMachine, ShiftDirection},
-    pio_instr_util,
-    relocate::RelocatedProgram,
-    PeripheralRef,
-};
-use embassy_time::{Duration, Timer};
-
-#[embassy_executor::task]
-pub async fn test(pio: PIO0, pin: AnyPin, dma: DMA_CH0) {
-    let (_common, mut sm, ..) = pio.split();
-    let mut dma = PeripheralRef::new(dma);
-
-    let pio_program = pio_proc::pio_file!("src/neopixel.pio");
-
-    let relocated = RelocatedProgram::new(&pio_program.program);
-    sm.write_instr(relocated.origin() as usize, relocated.code());
-    pio_instr_util::exec_jmp(&mut sm, relocated.origin());
-
-    let pin = sm.make_pio_pin(pin);
-    sm.set_set_pins(&[&pin]);
-    sm.set_sideset_base_pin(&pin);
-    sm.set_sideset_count(1);
-
-    // Clock config
-    // TODO CLOCK_FREQ should come from embassy_rp
-    const CLOCK_FREQ: u32 = 125_000_000;
-    const WS2812_FREQ: u32 = 800_000;
-    const CYCLES_PER_BIT: u32 = 16;
-
-    let bit_freq = WS2812_FREQ * CYCLES_PER_BIT;
-    let mut int = CLOCK_FREQ / bit_freq;
-    let rem = CLOCK_FREQ - (int * bit_freq);
-    let frac = (rem * 256) / bit_freq;
-    // 65536.0 is represented as 0 in the pio's clock divider
-    if int == 65536 {
-        int = 0;
-    }
-    sm.set_clkdiv((int << 8) | frac);
-    let pio::Wrap { source, target } = relocated.wrap();
-    sm.set_wrap(source, target);
-
-    sm.set_autopull(true);
-    sm.set_fifo_join(FifoJoin::TxOnly);
-    sm.set_pull_threshold(8); // 24?
-    sm.set_out_shift_dir(ShiftDirection::Left);
-
-    sm.set_enable(true);
-
-    log::info!("wrap: {:?}", sm.get_wrap());
-    log::info!("addr: {:?}", sm.get_addr());
-    log::info!("sideset_base: {:?}", sm.get_sideset_base());
-    log::info!("sideset_count: {:?}", sm.get_sideset_count());
-    log::info!("in_base: {:?}", sm.get_in_base());
-    log::info!("jmp_pin: {:?}", sm.get_jmp_pin());
-    log::info!("set_range: {:?}", sm.get_set_range());
-    log::info!("out_range: {:?}", sm.get_out_range());
-    log::info!("pull_threshold: {:?}", sm.get_pull_threshold());
-    log::info!("push_threshold: {:?}", sm.get_push_threshold());
-
-    //sm = rp2pio.StateMachine(
-    //    assembled,
-    //    frequency=12_800_000,  # to get appropriate sub-bit times in PIO program
-    //    first_sideset_pin=NEOPIXEL,
-    //    auto_pull=True,
-    //    out_shift_right=False,
-    //    pull_threshold=8,
-    //)
-
-    loop {
-        log::info!("sending dma");
-
-        sm.dma_push(dma.reborrow(), &[0x0a, 0x00, 0x00]).await;
-        Timer::after(Duration::from_millis(500)).await;
-        sm.dma_push(dma.reborrow(), &[0x00, 0x0a, 0x00]).await;
-        Timer::after(Duration::from_millis(500)).await;
-        sm.dma_push(dma.reborrow(), &[0x00, 0x00, 0x0a]).await;
-        Timer::after(Duration::from_millis(500)).await;
-
-        //sm0.set_enable(true);
-    }
-}
-
-#[embassy_executor::task]
-pub async fn test_blink(pio: PIO0, pin: AnyPin) {
-    log::info!("test blink hehe");
-    let (_, mut sm, ..) = pio.split();
-    // Setup sm2
-
-    // blink
-    let prg = pio_proc::pio_file!("src/blink.pio");
-
-    let relocated = RelocatedProgram::new(&prg.program);
-    let out_pin = sm.make_pio_pin(pin);
-    let pio_pins = [&out_pin];
-    sm.set_set_pins(&pio_pins);
-    sm.set_set_range(25, 1);
-
-    sm.write_instr(relocated.origin() as usize, relocated.code());
-    pio_instr_util::exec_jmp(&mut sm, relocated.origin());
-    // sm.set_clkdiv((65535 << 8) + 255 as u32);
-    // sm.set_clkdiv(0);
-
-    let pio::Wrap { source, target } = relocated.wrap();
-    sm.set_wrap(source, target);
-
-    //     sm.set_clkdiv((125e6 / 20.0 / 2e2 * 256.0) as u32);
-    sm.set_enable(true);
-    // sm.wait_push().await as i32;
-    // sm.push_tx(1);
-    sm.wait_push(125_000_000).await;
-    log::info!("started");
-
-    loop {
-        sm.wait_irq(3).await;
-        log::info!("did it!");
-    }
-}
-*/

src/neopixel2.pio

@@ -1,8 +0,0 @@
-.program ws2812
-.origin 0
-.wrap_target
-   out x 1
-   set pins,1 [1]
-   mov pins,x [1]
-   set pins,0
-.wrap

src/panic_handler.rs

@@ -1,28 +0,0 @@
-use core::panic::PanicInfo;
-
-use embassy_executor::Executor;
-use embassy_rp::gpio::{AnyPin, Level, Output, Pin};
-use embassy_time::{Duration, Timer};
-use static_cell::StaticCell;
-
-#[panic_handler]
-fn panic_blink(_info: &PanicInfo) -> ! {
-    static EXECUTOR: StaticCell<Executor> = StaticCell::new();
-
-    // SAFETY: we panicked, so no other code will be running.
-    let p = unsafe { embassy_rp::Peripherals::steal() };
-
-    EXECUTOR.init(Executor::new()).run(|spawner| {
-        spawner.spawn(blink(p.PIN_11.degrade())).ok();
-    });
-}
-
-#[embassy_executor::task]
-async fn blink(led: AnyPin) {
-    let mut led = Output::new(led, Level::High);
-
-    loop {
-        Timer::after(Duration::from_secs(1)).await;
-        led.toggle();
-    }
-}

src/usb.rs

@@ -1,73 +0,0 @@
-use embassy_executor::Spawner;
-use embassy_rp::{interrupt, peripherals::USB, usb::Driver};
-use embassy_usb::{Builder, Config, UsbDevice};
-use static_cell::StaticCell;
-
-pub mod keyboard;
-pub mod logger;
-
-pub const MAX_PACKET_SIZE: u8 = 64;
-
-struct State {
-    device_descriptor: [u8; 256],
-    config_descriptor: [u8; 256],
-    bos_descriptor: [u8; 256],
-    control_buf: [u8; 64],
-}
-
-static STATE: StaticCell<State> = StaticCell::new();
-
-pub async fn setup_logger_and_keyboard(usb: USB) {
-    let mut builder = builder(usb);
-    logger::setup(&mut builder).await;
-
-    log::error!("log_level: error");
-    log::warn!("log_level: warn");
-    log::info!("log_level: info");
-    log::debug!("log_level: debug");
-    log::trace!("log_level: trace");
-
-    keyboard::setup(&mut builder).await;
-    let usb = builder.build();
-    Spawner::for_current_executor().await.must_spawn(run(usb));
-}
-
-pub fn builder(usb: USB) -> Builder<'static, Driver<'static, USB>> {
-    let state = STATE.init(State {
-        device_descriptor: [0; 256],
-        config_descriptor: [0; 256],
-        bos_descriptor: [0; 256],
-        control_buf: [0; 64],
-    });
-
-    // Create embassy-usb Config
-    let mut config = Config::new(0xb00b, 0x1355);
-    config.manufacturer = Some("Tux");
-    config.product = Some("Tangentbord1");
-    config.serial_number = Some("42069");
-    config.max_power = 100;
-    config.max_packet_size_0 = MAX_PACKET_SIZE;
-
-    // Required for windows compatiblity.
-    // https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.9.1/kconfig/CONFIG_CDC_ACM_IAD.html#help
-    config.device_class = 0xEF;
-    config.device_sub_class = 0x02;
-    config.device_protocol = 0x01;
-    config.composite_with_iads = true;
-
-    let driver = Driver::new(usb, interrupt::take!(USBCTRL_IRQ));
-
-    Builder::new(
-        driver,
-        config,
-        &mut state.device_descriptor,
-        &mut state.config_descriptor,
-        &mut state.bos_descriptor,
-        &mut state.control_buf,
-    )
-}
-
-#[embassy_executor::task]
-pub async fn run(mut device: UsbDevice<'static, Driver<'static, USB>>) {
-    device.run().await
-}

src/usb/keyboard.rs

@@ -1,170 +0,0 @@
-pub mod report;
-
-use embassy_executor::Spawner;
-use embassy_rp::{peripherals::USB, usb::Driver};
-use embassy_sync::mutex::Mutex;
-use embassy_time::{Duration, Timer};
-use embassy_usb::{
-    class::hid::{self, HidReaderWriter, ReadError, ReportId, RequestHandler},
-    control::OutResponse,
-    Builder,
-};
-use embassy_usb_driver::EndpointError;
-use static_cell::StaticCell;
-use usbd_hid::descriptor::{MouseReport, SerializedDescriptor};
-
-use crate::{
-    usb::keyboard::report::{KeyboardReport, EMPTY_KEYBOARD_REPORT},
-    util::CS,
-};
-
-use super::MAX_PACKET_SIZE;
-
-struct Handler;
-
-static CONTEXT: StaticCell<Context> = StaticCell::new();
-
-pub static KB_REPORT: Mutex<CS, KeyboardReport> = Mutex::new(EMPTY_KEYBOARD_REPORT);
-
-struct Context {
-    handler: Handler,
-    state: hid::State<'static>,
-}
-
-pub async fn setup(builder: &mut Builder<'static, Driver<'static, USB>>) {
-    log::info!("setting up usb hid");
-
-    let context = CONTEXT.init(Context {
-        handler: Handler,
-        state: hid::State::new(),
-    });
-
-    let config = hid::Config {
-        //report_descriptor: MouseReport::desc(),
-        report_descriptor: KeyboardReport::desc(),
-        request_handler: Some(&context.handler),
-        poll_ms: 2,
-        max_packet_size: MAX_PACKET_SIZE as u16,
-    };
-
-    let stream = HidStream::new(builder, &mut context.state, config);
-
-    let spawner = Spawner::for_current_executor().await;
-
-    spawner.must_spawn(task(stream, &context.handler));
-
-    log::info!("done setting up usb keyboard");
-}
-
-impl RequestHandler for Handler {
-    fn get_report(&self, id: ReportId, buf: &mut [u8]) -> Option<usize> {
-        log::info!("get_report({id:?}, {buf:?})");
-        let _ = (id, buf);
-        None
-    }
-
-    fn set_report(&self, id: ReportId, data: &[u8]) -> embassy_usb::control::OutResponse {
-        log::info!("set_report({id:?}, {data:?})");
-        let _ = (id, data);
-        OutResponse::Rejected
-    }
-
-    fn get_idle_ms(&self, id: Option<ReportId>) -> Option<u32> {
-        log::info!("get_idle_ms({id:?})");
-        let _ = id;
-        None
-    }
-
-    fn set_idle_ms(&self, id: Option<ReportId>, duration_ms: u32) {
-        log::info!("set_idle_ms({id:?}, {duration_ms})");
-        let _ = (id, duration_ms);
-    }
-}
-type HidStream = HidReaderWriter<'static, Driver<'static, USB>, 256, 256>;
-
-#[embassy_executor::task]
-async fn task(stream: HidStream, handler: &'static Handler) {
-    if let Err(e) = keyboard_test(stream, handler).await {
-        log::error!("keyboard error: {e:?}");
-    }
-    //if let Err(e) = mouse_wiggler(stream).await {
-    //    log::error!("mouse wiggler: {e:?}");
-    //}
-}
-
-async fn keyboard_test(mut stream: HidStream, _handler: &'static Handler) -> Result<(), Error> {
-    stream.ready().await;
-    loop {
-        Timer::after(Duration::from_millis(2)).await;
-
-        let report = KB_REPORT.lock().await.clone();
-        if report.keycodes != EMPTY_KEYBOARD_REPORT.keycodes {
-            log::trace!("keys: {:x?}", report.keycodes);
-        }
-
-        #[cfg(feature = "n-key-rollover")]
-        stream.write(report.as_bytes()).await?;
-
-        #[cfg(not(feature = "n-key-rollover"))]
-        stream.write_serialize(&report).await?;
-    }
-}
-
-#[allow(dead_code)]
-async fn mouse_wiggler(mut stream: HidStream) -> Result<(), Error> {
-    stream.ready().await;
-
-    let (_r, mut w) = stream.split();
-
-    let write_fut = async move {
-        let mut x = 1;
-        loop {
-            for _ in 0..100 {
-                Timer::after(Duration::from_millis(10)).await;
-                log::info!("sending mouse report");
-                //w.ready().await;
-                w.write_serialize(&MouseReport {
-                    x,
-                    y: 0,
-                    buttons: 0,
-                    wheel: 0,
-                    pan: 0,
-                })
-                .await?;
-            }
-            x = -x;
-        }
-    };
-
-    //let read_fut = async move {
-    //    let mut buf = [0u8; MAX_PACKET_SIZE as usize];
-    //    loop {
-    //        Timer::after(Duration::from_millis(30)).await;
-    //        let n = r.read(&mut buf).await?;
-    //        log::info!("got packet: {:?}", &buf[..n]);
-    //    }
-    //};
-
-    //let r: Result<((), ()), Error> = try_join(write_fut, read_fut).await;
-    let r: Result<(), Error> = write_fut.await;
-    r?;
-
-    Ok(())
-}
-
-#[derive(Debug)]
-enum Error {
-    Read(ReadError),
-    Endpoint(EndpointError),
-}
-
-impl From<ReadError> for Error {
-    fn from(value: ReadError) -> Self {
-        Error::Read(value)
-    }
-}
-impl From<EndpointError> for Error {
-    fn from(value: EndpointError) -> Self {
-        Error::Endpoint(value)
-    }
-}

src/usb/logger.rs

@@ -1,81 +0,0 @@
-use crate::util::CS;
-
-use super::MAX_PACKET_SIZE;
-use core::fmt::Write as WriteFmt;
-use embassy_executor::Spawner;
-use embassy_rp::{peripherals::USB, usb::Driver};
-use embassy_sync::pipe::Pipe;
-use embassy_time::Instant;
-use embassy_usb::{
-    class::cdc_acm::{self, CdcAcmClass},
-    Builder,
-};
-use log::{Metadata, Record};
-use static_cell::StaticCell;
-
-pub const BUFFER_SIZE: usize = 16 * 1024;
-static BUFFER: Pipe<CS, BUFFER_SIZE> = Pipe::new();
-static STATE: StaticCell<cdc_acm::State<'static>> = StaticCell::new();
-
-struct UsbLogger;
-
-pub async fn setup(usb_builder: &mut Builder<'static, Driver<'static, USB>>) {
-    unsafe {
-        static LOGGER: UsbLogger = UsbLogger;
-        log::set_logger_racy(&LOGGER).unwrap();
-        log::set_max_level(log::LevelFilter::Debug);
-    }
-
-    let spawner = Spawner::for_current_executor().await;
-
-    let state = STATE.init(cdc_acm::State::new());
-
-    let class = CdcAcmClass::new(usb_builder, state, MAX_PACKET_SIZE as u16);
-
-    spawner.must_spawn(log_task(class));
-}
-
-//pub async fn print(s: &str) {
-//    BUFFER.writer().write_all(s.as_bytes()).await.ok(/* infallible */);
-//}
-
-#[embassy_executor::task]
-async fn log_task(mut class: CdcAcmClass<'static, Driver<'static, USB>>) {
-    let mut buf = [0u8; MAX_PACKET_SIZE as usize];
-
-    class.wait_connection().await;
-    loop {
-        let n = BUFFER.read(&mut buf).await;
-
-        // not much we can do if this fails, just ignore the error
-        let _ = class.write_packet(&buf[..n]).await;
-    }
-}
-
-impl log::Log for UsbLogger {
-    fn enabled(&self, _metadata: &Metadata) -> bool {
-        true
-    }
-
-    fn log(&self, record: &Record) {
-        if self.enabled(record.metadata()) {
-            let mut w = Writer;
-            let now = Instant::now();
-            let s = now.as_secs();
-            let ms = now.as_millis() % 1000;
-            let level = record.metadata().level();
-            let _ = writeln!(w, "[{s}.{ms:04}] ({level}) {}", record.args());
-        }
-    }
-
-    fn flush(&self) {}
-}
-
-struct Writer;
-
-impl core::fmt::Write for Writer {
-    fn write_str(&mut self, s: &str) -> Result<(), core::fmt::Error> {
-        let _ = BUFFER.try_write(s.as_bytes());
-        Ok(())
-    }
-}

src/util.rs

@@ -1,27 +0,0 @@
-use embassy_sync::blocking_mutex::raw::CriticalSectionRawMutex;
-use embassy_time::{Duration, Timer};
-
-use crate::ws2812::Rgb;
-
-pub type CS = CriticalSectionRawMutex;
-
-pub async fn stall() -> ! {
-    loop {
-        Timer::after(Duration::from_secs(1)).await;
-    }
-}
-
-/// Input a value 0 to 255 to get a color value
-// The colours are a transition r - g - b - back to r.
-pub fn wheel(mut wheel_pos: u8) -> Rgb {
-    wheel_pos = 255 - wheel_pos;
-    if wheel_pos < 85 {
-        return Rgb::new(255 - wheel_pos * 3, 0, wheel_pos * 3);
-    }
-    if wheel_pos < 170 {
-        wheel_pos -= 85;
-        return Rgb::new(0, wheel_pos * 3, 255 - wheel_pos * 3);
-    }
-    wheel_pos -= 170;
-    Rgb::new(wheel_pos * 3, 255 - wheel_pos * 3, 0)
-}

src/ws2812.rs

@@ -1,130 +0,0 @@
-use core::fmt::{self, Debug};
-use core::mem::transmute;
-
-use embassy_rp::dma::{self, AnyChannel};
-use embassy_rp::pio::{
-    FifoJoin, PioInstance, PioPeripheral, PioStateMachine, PioStateMachineInstance, ShiftDirection,
-    SmInstanceBase,
-};
-use embassy_rp::pio_instr_util;
-use embassy_rp::relocate::RelocatedProgram;
-use embassy_rp::{gpio, PeripheralRef};
-
-pub struct Ws2812<P: PioInstance> {
-    sm: PioStateMachineInstance<P, SmInstanceBase<0>>,
-    dma: PeripheralRef<'static, AnyChannel>,
-}
-
-/// An Rgb value that can be safely transmuted to u32 for use with Ws2812.
-#[repr(transparent)]
-#[derive(Clone, Copy, PartialEq, Eq)]
-pub struct Rgb(u32);
-
-impl<P: PioInstance> Ws2812<P> {
-    pub fn new<PP: PioPeripheral<Pio = P>>(
-        pio: PP,
-        dma: impl dma::Channel,
-        pin: gpio::AnyPin,
-    ) -> Self {
-        let (_, mut sm, ..) = pio.split();
-        // prepare the PIO program
-        let side_set = pio::SideSet::new(false, 1, false);
-        let mut a: pio::Assembler<32> = pio::Assembler::new_with_side_set(side_set);
-
-        const T1: u8 = 2; // start bit
-        const T2: u8 = 5; // data bit
-        const T3: u8 = 3; // stop bit
-        const CYCLES_PER_BIT: u32 = (T1 + T2 + T3) as u32;
-
-        let mut wrap_target = a.label();
-        let mut wrap_source = a.label();
-        let mut do_zero = a.label();
-        a.set_with_side_set(pio::SetDestination::PINDIRS, 1, 0);
-        a.bind(&mut wrap_target);
-        // Do stop bit
-        a.out_with_delay_and_side_set(pio::OutDestination::X, 1, T3 - 1, 0);
-        // Do start bit
-        a.jmp_with_delay_and_side_set(pio::JmpCondition::XIsZero, &mut do_zero, T1 - 1, 1);
-        // Do data bit = 1
-        a.jmp_with_delay_and_side_set(pio::JmpCondition::Always, &mut wrap_target, T2 - 1, 1);
-        a.bind(&mut do_zero);
-        // Do data bit = 0
-        a.nop_with_delay_and_side_set(T2 - 1, 0);
-        a.bind(&mut wrap_source);
-
-        let prg = a.assemble_with_wrap(wrap_source, wrap_target);
-
-        let relocated = RelocatedProgram::new(&prg);
-        sm.write_instr(relocated.origin() as usize, relocated.code());
-        pio_instr_util::exec_jmp(&mut sm, relocated.origin());
-
-        // Pin config
-        let out_pin = sm.make_pio_pin(pin);
-        sm.set_set_pins(&[&out_pin]);
-        sm.set_sideset_base_pin(&out_pin);
-        sm.set_sideset_count(1);
-
-        // Clock config
-        // TODO CLOCK_FREQ should come from embassy_rp
-        const CLOCK_FREQ: u32 = 125_000_000;
-        const WS2812_FREQ: u32 = 800_000;
-
-        let bit_freq = WS2812_FREQ * CYCLES_PER_BIT;
-        let mut int = CLOCK_FREQ / bit_freq;
-        let rem = CLOCK_FREQ - (int * bit_freq);
-        let frac = (rem * 256) / bit_freq;
-        // 65536.0 is represented as 0 in the pio's clock divider
-        if int == 65536 {
-            int = 0;
-        }
-
-        sm.set_clkdiv((int << 8) | frac);
-        let pio::Wrap { source, target } = relocated.wrap();
-        sm.set_wrap(source, target);
-
-        // FIFO config
-        sm.set_autopull(true);
-        sm.set_fifo_join(FifoJoin::TxOnly);
-        sm.set_pull_threshold(24);
-        sm.set_out_shift_dir(ShiftDirection::Left);
-
-        sm.set_enable(true);
-
-        Self {
-            sm,
-            dma: PeripheralRef::new(dma.degrade()),
-        }
-    }
-
-    pub async fn write(&mut self, colors: &[Rgb]) {
-        let colors = Rgb::slice_as_u32s(colors);
-        self.sm.dma_push(self.dma.reborrow(), colors).await;
-    }
-}
-
-impl Rgb {
-    #[inline(always)]
-    pub const fn new(r: u8, g: u8, b: u8) -> Self {
-        Self(u32::from_be_bytes([g, r, b, 0]))
-    }
-
-    /// Get the red, green, and blue components of this Rgb.
-    #[inline(always)]
-    pub const fn components(&self) -> (u8, u8, u8) {
-        let [g, r, b, _] = self.0.to_be_bytes();
-        (r, g, b)
-    }
-
-    #[inline(always)]
-    pub fn slice_as_u32s(rgbs: &[Rgb]) -> &[u32] {
-        // SAFETY: Rgb contains only a u32, and is #[repr(transparent)]
-        unsafe { transmute(rgbs) }
-    }
-}
-
-impl Debug for Rgb {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        let (r, g, b) = self.components();
-        f.debug_tuple("Rgb").field(&r).field(&g).field(&b).finish()
-    }
-}