feat: CH552 based firmware

RP2040/main.py

@@ -0,0 +1,43 @@
+from adafruit_hid.keycode import Keycode
+from adafruit_hid.keyboard import Keyboard
+from adafruit_debouncer import Debouncer
+import usb_hid
+import digitalio
+import board
+
+############# WIRING #############
+#
+# GND   <-> Audio Jack Ground
+# GP1   <-> Audio Jack Left/Right
+#
+########### END WIRING ###########
+
+
+############# CONFIG #############
+keycodePress = Keycode.D
+readPin = board.GP5
+
+########### END CONFIG ###########
+
+
+######## SYSTEM VARIABLES ########
+# Keyboard
+kbd = Keyboard(usb_hid.devices)
+
+# Button/Switch
+pin = digitalio.DigitalInOut(readPin)
+pin.direction = digitalio.Direction.INPUT
+pin.pull = digitalio.Pull.UP
+switch = Debouncer(pin, interval=0.02)
+###### END SYSTEM VARIABLES ######
+
+### BEGIN PROGRAM ###
+# Clean up any left over keypresses, sometimes they happen
+kbd.release_all()
+
+while True:
+    switch.update()
+    if switch.rose:
+        kbd.release(keycodePress)
+    if switch.fell:
+        kbd.press(keycodePress)