Hook your Feather STM32F405 to a Protomatter RGB Matrix with a minimum of fuss. The RGB and CLK pins are configured for a minimum of memory usage. Just follow the silkscreen to get the proper RGBMatrix setup.

Note that the pinout is different than the one on the Learn guide, I (unintentionally) swapped OE and LAT.

Pinout: matrix = rgbmatrix.RGBMatrix( width=64, bit_depth=4, rgb_pins=[board.D13, board.D12, board.D11, board.A4, board.A5, board.D6], addr_pins=[board.A0, board.A1, board.A2, board.A3], clock_pin=board.D5, latch_pin=board.D10, output_enable_pin=board.D9)