qmk_firmware_custom/keyboards/niu_mini/keymaps/default/keymap.c

#include QMK_KEYBOARD_H

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {

	[0] = LAYOUT_ortho_4x12(
		KC_ESC, KC_Q,     KC_W,    KC_E,    KC_R,  KC_T,   KC_Y,   KC_U,  KC_I,    KC_O,    KC_P,    KC_BSPC,
		KC_TAB, KC_A,     KC_S,    KC_D,    KC_F,  KC_G,   KC_H,   KC_J,  KC_K,    KC_L,    KC_SCLN, KC_QUOT,
		KC_LSFT, KC_Z,    KC_X,    KC_C,    KC_V,  KC_B,   KC_N,   KC_M,  KC_COMM, KC_DOT,  KC_UP,   KC_ENT,
		KC_LCTL, KC_LGUI, KC_CAPS, KC_LALT, MO(1), KC_SPC, KC_SPC, MO(2), KC_SLSH, KC_LEFT, KC_DOWN, KC_RGHT
  ),

	[1] = LAYOUT_ortho_4x12(
		KC_GRV,  KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_TRNS,
		KC_TRNS, KC_VOLD, KC_VOLU, KC_MUTE, KC_TRNS, KC_TRNS, KC_TRNS, KC_F11,  KC_F12,  KC_TRNS, KC_TRNS, KC_TRNS,
		KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
		RESET,   KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS
	),

	[2] = LAYOUT_ortho_4x12(
		KC_TRNS, KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_TRNS,
		KC_TRNS, RGB_TOG, RGB_MOD, RGB_HUI, RGB_HUD, KC_TRNS, KC_TRNS, KC_MINS, KC_EQL,  KC_LBRC, KC_RBRC, KC_BSLS,
		KC_TRNS, BL_TOGG, BL_STEP, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
		KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS
  )
};


void matrix_init_user(void) {
}

void matrix_scan_user(void) {
}

bool process_record_user(uint16_t keycode, keyrecord_t *record) {
	return true;
}

void led_set_user(uint8_t usb_led) {

	if (usb_led & (1 << USB_LED_NUM_LOCK)) {

	} else {

	}

	if (usb_led & (1 << USB_LED_CAPS_LOCK)) {

	} else {

	}

	if (usb_led & (1 << USB_LED_SCROLL_LOCK)) {

	} else {

	}

	if (usb_led & (1 << USB_LED_COMPOSE)) {

	} else {

	}

	if (usb_led & (1 << USB_LED_KANA)) {

	} else {

	}

}