qmk_firmware_custom/keyboards/dk60/keymaps/default/keymap.c

#include QMK_KEYBOARD_H

enum planck_layers {
  _QWERTY,
  _FN,
  _DVORAK,
  _LOWER,
  _RAISE,
  _PLOVER,
  _ADJUST
};

enum planck_keycodes {
  QWERTY = SAFE_RANGE,
  FN
};

// Fillers to make layering more clear
#define ______ KC_TRNS

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
  /* Qwerty gui/alt/space/alt/gui
   * ,-----------------------------------------------------------------------------------------.
   * | Esc |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  8  |  9  |  0  |  -  |  =  |  \  |  `  |
   * |-----------------------------------------------------------------------------------------+
   * | Tab    |  Q  |  W  |  E  |  R  |  T  |  Y  |  U  |  I  |  O  |  P  |  [  |  ]  |  Bksp  |
   * |-----------------------------------------------------------------------------------------+
   * | Ctrl    |  A  |  S  |  D  |  F  |  G  |  H  |  J  |  K  |  L  |  ;  |  '  |    Enter    |
   * |-----------------------------------------------------------------------------------------+
   * | Shift     |  Z  |  X  |  C  |  V  |  B  |  N  |  M  |  ,  |  .  |  /  | RShift    | FN  |
   * |-----------------------------------------------------------------------------------------+
   *         |LGUI | LAlt  |               Space                | RAlt   |RGUI |
   *         `-----------------------------------------------------------------'
   */
  [_QWERTY] = LAYOUT( /* Basic QWERTY */
    KC_ESC,  KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_MINS, KC_EQL,  KC_BSLS, KC_GRV, \
    KC_TAB,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,    KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_LBRC, KC_RBRC, KC_BSPC, \
    KC_LCTL, KC_A,    KC_S,    KC_D,    KC_F,    KC_G,    KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_QUOT, KC_ENT,  \
    KC_LSFT, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,    KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH, KC_RSFT, FN,      \
             KC_LGUI, KC_LALT,                   KC_SPC,                    KC_RALT, KC_RGUI  \
  ),

/* FN Layer
 * ,-----------------------------------------------------------------------------------------.
 * |     | F1  | F2  | F3  | F4  | F5  | F6  | F7  | F8  | F9  | F10 | F11 | F12 | Ins | Del |
 * |-----------------------------------------------------------------------------------------+
 * |  CAPS  |     |     |     |     |     |     |     | Psc | Slck| Paus| Up  |     |        |
 * |-----------------------------------------------------------------------------------------+
 * |         | Vol-| Vol+| Mute|     |     | *   | /   | Home| PgUp| Left|Right|             |
 * |-----------------------------------------------------------------------------------------+
 * |           | Prev| Play| Next|     |     | +   | -   | End  |PgDn| Down|           |     |
 * |-----------------------------------------------------------------------------------------+
 *         |       |       |                                 | Stop  |       |
 *         `-----------------------------------------------------------------'
 */
  [_FN] = LAYOUT( /* Layer 1 */
    ______,  KC_F1,   KC_F2,   KC_F3,   KC_F4,  KC_F5,  KC_F6,   KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12, KC_INS, KC_DEL, \
    KC_CAPS, ______,  ______,  ______,  ______, ______, ______,  ______,  KC_PSCR, KC_SLCK, KC_PAUS, KC_UP,   ______, ______, \
    ______,  KC_VOLD, KC_VOLU, KC_MUTE, ______, ______, KC_PAST, KC_PSLS, KC_HOME, KC_PGUP, KC_LEFT, KC_RGHT, ______, \
    ______,  KC_MPRV, KC_MPLY, KC_MNXT, ______, ______, KC_PPLS, KC_PMNS, KC_END,  KC_PGDN, KC_DOWN, ______,  ______, \
             ______,  ______,                   ______,                   KC_MSTP, ______   \
  )
};

bool process_record_user(uint16_t keycode, keyrecord_t *record) {
  switch (keycode) {
    case FN:
      if (record->event.pressed) {
        layer_on(_FN);
        dk60_esc_led_on();
      } else {
        layer_off(_FN);
        dk60_esc_led_off();
      }
      return false;
      break;
  }
  return true;
}