Add basic usb serial shell

Cargo.toml

@@ -17,26 +17,33 @@ lto = false
 cortex-m = "~0.6"
 cortex-m-rt = "~0.6"
 nb = "~0.1"
-#ssd1306 = "~0.2"
-ssd1351 = "~0.2"
+#ssd1351 = "~0.2"
 embedded-graphics = "^0.4.0"
 embedded-hal = "=0.2.3"
+usb-device = "0.2"
+usbd-serial = "0.1"
+
+[dependencies.ssd1351]
+version = "0.3"
+#git = "https://github.com/MabezDev/ssd1351"
+#branch = "crude-ehal-digital-v2-support"
+path = "../ssd1351"
 
 [dependencies.itsybitsy_m0]
-version = "~0.7"
+version = "~0.10"
 git = "https://github.com/atsamd-rs/atsamd"
 features = [
 	"rt",
 	"unproven",
+	"usb",
 ]
 
 [dependencies.atsamd-hal]
-version = "~0.8"
+version = "~0.12"
 git = "https://github.com/atsamd-rs/atsamd"
 features = [
-	"atsamd21g18a",
-	"samd21g18a",
-	"samd21g18a-rt",
+	"atsamd21g",
+	"samd21g",
+	"samd21g-rt",
 	"unproven",
 ]
-