Experimental: Attempt to build USB firmware.

ci/micropython.sh

@@ -23,6 +23,11 @@ function micropython_clone {
     git submodule update --init lib/micropython-lib
     git submodule update --init lib/tinyusb
     git submodule update --init lib/btstack
+    cd lib/micropython-lib
+    git remote add usb https://github.com/projectgus/micropython-lib
+    git fetch usb feature/usbd_python
+    git checkout feature/usbd_python
+    cd ../../
     cd ../
 }
 

micropython/board/RPI_PICO/mpconfigboard.h

@@ -1,3 +1,4 @@
 // Board and hardware specific configuration
 #define MICROPY_HW_BOARD_NAME                   "Raspberry Pi Pico"
-#define MICROPY_HW_FLASH_STORAGE_BYTES          (1408 * 1024)
+#define MICROPY_HW_FLASH_STORAGE_BYTES          (1408 * 1024)
+#define MICROPY_HW_ENABLE_USB_RUNTIME_DEVICE    1

micropython/board/manifest_pico.py

@@ -2,4 +2,11 @@ freeze("../modules_py", "gfx_pack.py")
 freeze("../modules_py", "interstate75.py")
 
 freeze("../modules_py", "pimoroni.py")
-freeze("../modules_py", "boot.py")
+freeze("../modules_py", "boot.py")
+
+require("usb-device")
+require("usb-device-hid")
+require("usb-device-cdc")
+# require("usb-device-keyboard")
+# require("usb-device-mouse")
+# require("usb-device-midi")