keymap.c

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
  [0] = LAYOUT( /* Base */
          KC_MUTE,   KC_MPLY,
    KC_LSHIFT, KC_7, KC_8, KC_9,
    KC_LCTRL, KC_4, KC_5, KC_6,
    KC_LALT, KC_1, KC_2, KC_3,
    KC_LGUI, TG(1), KC_0, KC_DOLLAR
  ),
  [1] = LAYOUT( /* Meeting Controls */
        _______,           _______,
    LSFT(KC_F18), _______, _______, _______,
    LCTL(KC_F18), _______, _______, _______,
    LALT(KC_F18), _______, _______, _______,
    LGUI(KC_F18), _______, _______, _______
  ),
  [2] = LAYOUT(
        _______,           _______,
    _______, _______, _______, _______,
    _______, _______, _______, _______,
    _______, _______, _______, _______,
    _______, _______, _______, _______
  ),
  [3] = LAYOUT(
        _______,           _______,
    _______, _______, _______, _______,
    _______, _______, _______, _______,
    _______, _______, _______, _______,
    _______, _______, _______, _______
  ),
};

const rgblight_segment_t PROGMEM layer0_layer[] = RGBLIGHT_LAYER_SEGMENTS(
        {0,16,0}
    );
const rgblight_segment_t PROGMEM meeting_layer[] = RGBLIGHT_LAYER_SEGMENTS(
        {0,16,HSV_GREEN}
    );
const rgblight_segment_t PROGMEM mic_layer[] = RGBLIGHT_LAYER_SEGMENTS(
        {0,16,HSV_RED}
    );

const rgblight_segment_t* const PROGMEM my_rgb_layers[] = RGBLIGHT_LAYERS_LIST(
        layer0_layer,
        meeting_layer,
        mic_layer
    );

layer_state_t default_layer_state_set_user(layer_state_t state) {
    rgblight_set_layer_state(0, layer_state_cmp(state, 0));
    return state;
}

layer_state_t layer_state_set_user(layer_state_t state) {
    rgblight_set_layer_state(1, layer_state_cmp(state, 1));
    return state;
}

void keyboard_post_init_user(void) {
    // Enable the LED layers
    rgblight_layers = my_rgb_layers;
    layer_state_set_user(layer_state);
}

void encoder_update_user(uint8_t index, bool clockwise) {
    if (index == 0) { /* Left Encoder */
        if (clockwise) {
            tap_code(KC_VOLU);
        } else {
            tap_code(KC_VOLD);
        }
    } else if (index == 1) { /* Right Encoder */
        if (clockwise) {
            tap_code(KC_MNXT);
        } else {
            tap_code(KC_MPRV);
        }
    }
}