qmk_firmware/keyboards/keysofkings/twokey/keymaps/default/keymap.c

 /* Copyright 2020 Keys of Kings
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */

#include QMK_KEYBOARD_H

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
	LAYOUT(
		LT(1, KC_MUTE),
		LT(4, KC_MPLY), LT(7, KC_MNXT)),

	LAYOUT(
		KC_TRNS,
		TO(2), TO(3)),

	LAYOUT(
		TO(0),
		RGB_TOG, RGB_MOD),

	LAYOUT(
		TO(0),
		RGB_VAI, RGB_VAD),

    LAYOUT(
		TO(0),
		RGB_HUI, RGB_HUD),

	LAYOUT(
		TO(5),
		KC_TRNS, TO(6)),

	LAYOUT(
		TO(0),
		RGB_SAI, RGB_SAD),

	LAYOUT(
		TO(8),
		TO(9), KC_TRNS),

	LAYOUT(
		TO(0),
		CK_TOGG, MU_TOGG),

	LAYOUT(
		TO(0),
		QK_BOOT, EE_CLR),
};

void matrix_init_user(void) {
  debug_config.matrix = 1;
  debug_config.keyboard = 1;
  debug_config.enable = 1;
}

bool encoder_update_user(uint8_t index, bool clockwise) {
  if (index == 0) {
    if (clockwise) {
      tap_code(KC_VOLD);
    } else {
      tap_code(KC_VOLU);
    }
    #    ifdef AUDIO_CLICKY
            clockwise ? clicky_freq_up() : clicky_freq_down();
#    endif
  }
  return true;
}