qmk_firmware/keyboards/handwired/macroboard/f411/info.json

{
    "matrix_pins": {
        "cols": ["B12", "B13", "B14", "B15", "A8", "A10"],
        "rows": ["A15", "B3", "B4", "B5", "B7"]
    },
    "diode_direction": "COL2ROW",
    "ws2812": {
        "driver": "pwm"
    },
    "processor": "STM32F411",
    "bootloader": "stm32-dfu",
    "board": "BLACKPILL_STM32_F411"
}