initial support for RP2040 Pro Micro corne

boards/crkbd/kb_rp2040.py

@@ -0,0 +1,29 @@
+import board
+
+from kmk.kmk_keyboard import KMKKeyboard as _KMKKeyboard
+from kmk.matrix import DiodeOrientation
+from kmk.matrix import intify_coordinate as ic
+
+
+class KMKKeyboard(_KMKKeyboard):
+    col_pins = (
+        board.A3,
+        board.A2,
+        board.A1,
+        board.A0,
+        board.SCK,
+        board.MISO,
+    )
+    row_pins = (board.D4, board.D5, board.D6, board.D7)
+    diode_orientation = DiodeOrientation.COLUMNS
+    data_pin = board.RX
+    rgb_pixel_pin = board.D0
+    i2c = board.I2C
+
+    coord_mapping = []
+    coord_mapping.extend(ic(0, x) for x in range(12))
+    coord_mapping.extend(ic(1, x) for x in range(12))
+    coord_mapping.extend(ic(2, x) for x in range(12))
+
+    # And now, to handle R3, which at this point is down to just six keys
+    coord_mapping.extend(ic(3, x) for x in range(3, 9))