feat(extensions): most of the extensions implementation, by kdb424

boards/boardsource/4x12/kb.py

@@ -0,0 +1,25 @@
+import board
+
+from kmk.kmk_keyboard import KMKKeyboard as _KMKKeyboard
+from kmk.matrix import DiodeOrientation
+
+
+class KMKKeyboard(_KMKKeyboard):
+    row_pins = (board.P0_08, board.P0_06, board.P0_17, board.P0_20)
+    col_pins = (
+        board.P0_31,
+        board.P0_29,
+        board.P0_02,
+        board.P1_15,
+        board.P1_13,
+        board.P1_11,
+        board.P0_10,
+        board.P0_09,
+        board.P1_06,
+        board.P1_04,
+        board.P0_11,
+        board.P1_00,
+    )
+    diode_orientation = DiodeOrientation.COLUMNS
+    i2c = board.I2C
+    powersave_pin = board.P0_13