qmk-firmware/keyboards/primekb/prime_e/keymaps/default/keymap.c

/* 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

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
    LAYOUT(
		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,
		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,          MO(1),  KC_N,     KC_M, KC_COMM, KC_DOT,  KC_SLSH, KC_LSFT,
		KC_LCTL,  KC_LALT,                    KC_RBRC, MO(1),	        KC_SPC, KC_MINS,                          KC_LGUI, TO(1)
    )

};

void matrix_init_user(void) {
  // set CapsLock LED to output and low
  setPinOutput(B1);
  writePinHigh(B1);
  // set NumLock LED to output and low
  setPinOutput(B2);
  writePinHigh(B2);
  // set ScrollLock LED to output and low
  setPinOutput(B3);
  writePinHigh(B3);
}

void matrix_scan_user(void) {

}


void led_set_user(uint8_t usb_led) {
  if (IS_LED_ON(usb_led, USB_LED_NUM_LOCK)) {
    writePinHigh(B2);
  } else {
    writePinLow(B2);
  }
  if (IS_LED_ON(usb_led, USB_LED_CAPS_LOCK)) {
    writePinHigh(B1);
  } else {
    writePinLow(B1);
  }
/*
  if (IS_LED_ON(usb_led, USB_LED_SCROLL_LOCK)) {
    writePinHigh(B3);
  } else {
    writePinLow(B3);
  }*/

}

//function for layer indicator LED
uint32_t layer_state_set_user(uint32_t state)
{
    if (biton32(state) == 1) {
    writePinHigh(B3);
	} else {
		writePinLow(B3);
    }
    return state;
}