qmk_firmware/keyboards/viktus/sp_mini/keymaps/default/keymap.c

 /* Copyright 2021 jrfhoutx
  *
  * 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

// Each layer gets a name for readability, which is then used in the keymap matrix below.
// The underscores don't mean anything - you can have a layer called STUFF or any other name.
// Layer names don't all need to be of the same length, obviously, and you can also skip them
// entirely and just use numbers.


enum custom_layers {
    _BASE,
    _FN1,
    _FN2,
    _FN3,
};

enum custom_keycodes {
  QWERTY = SAFE_RANGE,
};

#define KC_FN1 MO(_FN1)
#define KC_FN2 MO(_FN2)
#define SPFN1 LT(_FN1, KC_SPACE)
#define BSFN2 LT(_FN2, KC_BSPC)


const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
  [_BASE] = LAYOUT_all(
    _______,   _______,   _______,   _______,   _______,   _______,   _______,   _______,   _______,   _______,   _______,   _______,   KC_F24,    _______,   _______,
    MO(1),     KC_ESC,    KC_Q,      KC_W,      KC_E,      KC_R,      KC_T,      KC_Y,      KC_U,      KC_I,      KC_O,      KC_P,      KC_DEL,    KC_BSPC,   _______,
    MO(2),     KC_TAB,    KC_A,      KC_S,      KC_D,      KC_F,      KC_G,      KC_H,      KC_J,      KC_K,      KC_L,      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_RSFT,   KC_UP,
    _______,   KC_LCTL,   KC_LALT,   KC_LGUI,   KC_FN1,    SPFN1,                                      BSFN2,     KC_RALT,   KC_FN2,    KC_LEFT,   KC_DOWN,   KC_RGHT
  ),

  [_FN1] = LAYOUT_all(
    _______,   QK_BOOT,   _______,   _______,   _______,   _______,   _______,   _______,   _______,   _______,   _______,   _______,   _______,   _______,   _______,
    _______,   KC_GRV,    KC_1,      KC_2,      KC_3,      KC_4,      KC_5,      KC_6,      KC_7,      KC_8,      KC_9,      KC_0,      KC_MINS,   KC_EQL,    _______,
    _______,   RGB_TOG,   RGB_HUI,   RGB_SAI,   RGB_VAI,   KC_VOLU,   KC_LBRC,   KC_RBRC,   KC_4,      KC_5,      KC_6,      KC_SCLN,              _______,   _______,
    _______,   RGB_MOD,   RGB_HUD,   RGB_SAD,   RGB_VAD,   KC_VOLD,   KC_LCBR,              KC_RCBR,   KC_1,      KC_2,      KC_3,      _______,   KC_UP,
    _______,   _______,   _______,   _______,   _______,   _______,                                    KC_DEL,    KC_0,      _______,   KC_LEFT,   KC_DOWN,   KC_RGHT
  ),

  [_FN2] = LAYOUT_all(
    _______,   _______,   _______,   _______,   _______,   _______,   _______,   _______,   _______,   _______,   _______,   _______,   _______,   _______,   _______,
    _______,   KC_TILD,   KC_EXLM,   KC_AT,     KC_HASH,   KC_DLR,    KC_PERC,   KC_CIRC,   KC_AMPR,   KC_ASTR,   KC_LPRN,   KC_RPRN,   KC_UNDS,   KC_PLUS,   _______,
    _______,   _______,   _______,   _______,   KC_INS,    KC_PGUP,   KC_HOME,   _______,   _______,   _______,   _______,   KC_COLN,              _______,   _______,
    _______,   _______,   _______,   _______,   KC_DEL,    KC_PGDN,   KC_END,               _______,   _______,   _______,   _______,   _______,   KC_UP,
    _______,   _______,   _______,   _______,   _______,   KC_DEL,                                     _______,   _______,   _______,   KC_LEFT,   KC_DOWN,   KC_RGHT
  ),

  [_FN3] = LAYOUT_all(
    _______,   _______,   _______,   _______,   _______,   _______,   _______,   _______,   _______,   _______,   _______,   _______,   KC_F24,    _______,   _______,
    MO(1),     KC_ESC,    KC_Q,      KC_W,      KC_E,      KC_R,      KC_T,      KC_Y,      KC_U,      KC_I,      KC_O,      KC_P,      KC_DEL,    KC_BSPC,   _______,
    MO(2),     KC_TAB,    KC_A,      KC_S,      KC_D,      KC_F,      KC_G,      KC_H,      KC_J,      KC_K,      KC_L,      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_RSFT,   KC_UP,
    _______,   KC_LCTL,   KC_LALT,   KC_LGUI,   KC_FN1,    SPFN1,                                      BSFN2,     KC_RALT,   KC_FN2,    KC_LEFT,   KC_DOWN,   KC_RGHT
  )

};

void keyboard_pre_init_user(void) {
    gpio_set_pin_output(F5);  // initialize F5 for LED
    gpio_set_pin_output(F6);  // initialize F6 for LED
    gpio_set_pin_output(F7);  // initialize F7 for LED

}

layer_state_t layer_state_set_user(layer_state_t state) {
    gpio_write_pin_low(F5);
    gpio_write_pin_low(F6);
    gpio_write_pin_low(F7);
    switch (get_highest_layer(state)) {
        case _FN1:
            gpio_write_pin_high(F5);
            break;
        case _FN2:
            gpio_write_pin_high(F6);
            break;
        case _FN3:  // replace 'XXXX' with the layer or function name
            gpio_write_pin_high(F7);
            break;
        case KC_F24:
            gpio_write_pin_high(F7);
            gpio_write_pin_high(F5);
            gpio_write_pin_high(F6);
            break;
        }
    return state;
}


bool spongebob_mode = false;
bool spongebob_case = false;
bool process_record_user(uint16_t keycode, keyrecord_t *record) {
  if (spongebob_mode) {
    switch(keycode) {
      case KC_A...KC_Z:
        if (record->event.pressed) {
          (spongebob_case ^= 1) == 0 ? tap_code16(S(keycode)) : tap_code(keycode);
          return false; break;
        }
    }
  }
  switch(keycode) {
    case KC_F24:
      if (record->event.pressed) {
        spongebob_mode ^= 1;
      }
      return false; break;
  }
  return true;
}