qmk_firmware/keyboards/ymd75/rev3/config.h

#pragma once

#define MATRIX_ROWS 12
#define MATRIX_COLS 9
#define MATRIX_ROW_PINS { B7, B3, B2, B1, B0, E6, F0, F1, F4, F5, F6, F7 }
#define MATRIX_COL_PINS { D0, D1, D2, D3, D5, D4, D6, D7, B4 }
#define BACKLIGHT_PIN B6 // change the backlight pin that has since changed in Rev 3
#define DIODE_DIRECTION ROW2COL
#define DEVICE_VER      0x0300
#define RGBLIGHT_EFFECT_KNIGHT_OFFSET 4