qmk_firmware/keyboards/redox/rev1/proton_c/keyboard.json

{
    "usb": {
        "device_version": "1.0.1"
    },
    "split": {
        "serial": {
            "driver": "usart"
        }
    },
    "ws2812": {
        "pin": "A9"
    },
    "matrix_pins": {
        "cols": ["A1", "A0", "B8", "B13", "B14", "B15", "B9"],
        "rows": ["B5", "B3", "B2", "B1", "B0"]
    },
    "diode_direction": "COL2ROW",
    "development_board": "proton_c"
}