Fixed IS31FL3731 LEDs on keybow 2040

boards/pimoroni/keybow_2040/is31fl3731_pixelbuf.py

@@ -0,0 +1,26 @@
+'''
+Simple PixelBuf wrapper for the IS31FL3731 controller used for the Keybow2040's RGB LEDs.
+'''
+
+import board
+
+from adafruit_is31fl3731.keybow2040 import Keybow2040 as KeybowLeds
+from adafruit_pixelbuf import PixelBuf
+
+
+class Keybow2040Leds(PixelBuf):
+    '''
+    Minimal PixelBuf wrapper for the Keybow 2040's LED array.
+    '''
+
+    def __init__(self, size: int):
+        self.leds = KeybowLeds(board.I2C())
+        self._pixels = size
+        super().__init__(size, byteorder='RGB')
+
+    def _transmit(self, buffer):
+        for pixel in range(self._pixels):
+            r = buffer[pixel * 3 + 0]
+            g = buffer[pixel * 3 + 1]
+            b = buffer[pixel * 3 + 2]
+            self.leds.pixelrgb(pixel // 4, pixel % 4, r, g, b)