qmk-firmware/keyboards/gh80_3000/keymaps/iso_default/keymap.c

#include QMK_KEYBOARD_H

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {

  LAYOUT_iso(
    KC_ESC,           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_PSCR, KC_SCRL, KC_PAUS,     KC_MPLY, KC_MPRV, KC_MNXT, KC_MUTE,
    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,  KC_BSPC, KC_BSPC,     KC_INS,  KC_HOME, KC_PGUP,     KC_NUM,  KC_PSLS, KC_PAST, KC_PMNS,
    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_DEL,  KC_END,  KC_PGDN,     KC_P7,   KC_P8,   KC_P9,   KC_PPLS,
    KC_CAPS, KC_A,    KC_S,    KC_D,    KC_F,    KC_G,    KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_QUOT, KC_BSLS,          KC_ENT,                                     KC_P4,   KC_P5,   KC_P6,   KC_PPLS,
    KC_LSFT, KC_NUBS, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,    KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH,          KC_RSFT, KC_RSFT,              KC_UP,                KC_P1,   KC_P2,   KC_P3,   KC_PENT,
    KC_LCTL, KC_LGUI, KC_LALT, KC_SPC,           KC_SPC,  KC_SPC,  KC_SPC,                             KC_RALT, KC_RGUI, KC_APP,  KC_RCTL,     KC_LEFT, KC_DOWN, KC_RGHT,     KC_P0,   KC_PCMM, KC_PDOT, KC_PENT
  )
};

void led_set_user(uint8_t usb_led) {

    if (usb_led & (1 << USB_LED_NUM_LOCK)) {
        DDRB |= (1 << 5); PORTB &= ~(1 << 5);
    } else {
        DDRB &= ~(1 << 5); PORTB &= ~(1 << 5);
    }

    if (usb_led & (1 << USB_LED_CAPS_LOCK)) {
        DDRB |= (1 << 6); PORTB &= ~(1 << 6);
    } else {
        DDRB &= ~(1 << 6); PORTB &= ~(1 << 6);
    }

    if (usb_led & (1 << USB_LED_SCROLL_LOCK)) {
        DDRB |= (1 << 7); PORTB &= ~(1 << 7);
    } else {
        DDRB &= ~(1 << 7); PORTB &= ~(1 << 7);
    }
}