text: /* Copyright 2018 Holten Campbell
   *
   * 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
  
  #define BLINK_DURATION 512
  #define CAPS_LED_PIN B1
  #define NUM_LED_PIN B2
  #define SCROLL_LED_PIN B3
  
  uint8_t CAPS;
  uint16_t BLINK_TIMER = 0;
  uint8_t CAPS_LED_STATE = 0;
  
  // Init togg_indicator so the compiler doesn't complain when I declare it last.
  static void togg_indicator(uint8_t *state, uint8_t pin);
  
  const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
    [0] = LAYOUT(
      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_BSPC,
      LT(2, KC_TAB), KC_A,    KC_S, KC_D,     KC_F,    KC_G,    KC_H,        KC_J,    KC_K,    KC_L,    KC_SCLN, LT(2, KC_ENT),
      KC_LSFT,       KC_Z,    KC_X, KC_C,     KC_V,    KC_B,    LT(3, KC_B), KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH, KC_RSFT,
      KC_LCTL,       KC_LGUI,       KC_LALT,  LT(1, KC_SPC),    LT(1, KC_SPC),        KC_RALT,          KC_RGUI, KC_RCTL
    ),
  
    [1] = LAYOUT(
      KC_GRV,  KC_1,    KC_2,    KC_3,    KC_4,    KC_5,        KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_DEL,  KC_DEL,
      KC_TRNS, KC_MINS, KC_EQL,  KC_SCLN, KC_QUOT, KC_TRNS,     KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT, KC_QUOT, KC_TRNS,
      KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,     KC_TRNS, KC_TRNS, KC_TRNS, KC_LBRC, KC_RBRC, KC_BSLS, KC_TRNS,
      KC_TRNS, KC_TRNS,          KC_TRNS, KC_TRNS,              KC_TRNS,          KC_TRNS,          KC_TRNS, KC_TRNS
    ),
  
    [2] = LAYOUT(
      KC_TILD, KC_EXLM, KC_AT,   KC_HASH, KC_DLR,  KC_PERC,     KC_CIRC, KC_AMPR, KC_ASTR, KC_LPRN, KC_RPRN, KC_DEL,  KC_TRNS,
      KC_TRNS, KC_UNDS, KC_PLUS, KC_COLN, KC_DQUO, KC_TRNS,     KC_HOME, KC_PGDN, KC_PGUP, KC_END,  KC_DQUO, KC_TRNS,
      KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,     KC_TRNS, KC_TRNS, KC_TRNS, KC_LCBR, KC_RCBR, KC_PIPE, KC_TRNS,
      KC_TRNS, KC_TRNS,          KC_TRNS, KC_TRNS,              KC_TRNS,          KC_TRNS,          KC_TRNS, KC_TRNS
    ),
  
    [3] = LAYOUT(
      KC_TRNS, 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_CAPS, 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, 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) {
    // set CapsLock LED to output and low
    setPinOutput(CAPS_LED_PIN);
    writePinLow(CAPS_LED_PIN);
    // set NumLock LED to output and low
    setPinOutput(NUM_LED_PIN);
    writePinLow(NUM_LED_PIN);
    // set ScrollLock LED to output and low
    setPinOutput(SCROLL_LED_PIN);
    writePinLow(SCROLL_LED_PIN);
  }
  
  void matrix_scan_user(void) {
      if (CAPS == 1) {
          // Blink the first led when capslock is active
          if (BLINK_TIMER >= BLINK_DURATION) {
              togg_indicator(&CAPS_LED_STATE, CAPS_LED_PIN);
              BLINK_TIMER = 0;
          }
          BLINK_TIMER++;
      }
  }
  
  //function for layer indicator LED
  layer_state_t layer_state_set_user(layer_state_t state) {
      if (layer_state_cmp(state, 1)) {
          writePinHigh(CAPS_LED_PIN);
      } else {
          writePinLow(CAPS_LED_PIN);
      }
      if (layer_state_cmp(state, 2)) {
          writePinHigh(NUM_LED_PIN);
      } else {
          writePinLow(NUM_LED_PIN);
      }
      if (layer_state_cmp(state, 3)) {
          writePinHigh(SCROLL_LED_PIN);
      } else {
          writePinLow(SCROLL_LED_PIN);
      }
      return state;
  }
  
  void led_set_user(uint8_t usb_led) {
      if (IS_LED_ON(usb_led, USB_LED_CAPS_LOCK)) {
          CAPS = 1;
      }
      else {
          CAPS = 0;
      }
  }
  
  void togg_indicator(uint8_t *state, uint8_t pin) {
      // Toggles a pin based on the current state
      if (*state == 0){
          *state = 1;
          writePinHigh(pin);
      }
      else if (*state == 1){
          *state = 0;
          writePinLow(pin);
      }
  }
  