qmk-firmware/keyboards/sirius/uni660/rev2/iso/keymaps/via/keymap.c

#include QMK_KEYBOARD_H

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
    [0] = LAYOUT_iso( /* Base */
        KC_ESC,     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_DEL,  KC_INS,
        KC_F1,      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_BSLS,          KC_DEL,
        KC_F2,      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_ENT,
        KC_F3,      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_UP,
        KC_F4,      KC_LCTL, KC_LGUI, KC_LALT,          KC_SPC,           KC_DEL,                    KC_SPC,           KC_RALT, KC_RGUI, KC_RCTL, KC_LEFT, KC_DOWN, KC_RGHT
    ),

    [1] = LAYOUT_iso( /* Layer 1 */
        _______,    _______, _______, _______, _______, _______, _______, _______,          _______, _______, _______, _______, _______, _______, _______, _______, _______,
        _______,    _______, _______, _______, _______, _______, _______,          _______, _______, _______, _______, _______, _______, _______, _______,          _______,
        _______,    _______, _______, _______, _______, _______, _______,          _______, _______, _______, _______, _______, _______,          _______,
        _______,    _______, _______, _______, _______, _______, _______, _______,          _______, _______, _______, _______, _______,          _______, _______,
        _______,    _______, _______, _______,          _______,          _______,                   _______,          _______, _______, _______, _______, _______, _______
    ),

    [2] = LAYOUT_iso( /* Layer 2 */
        _______,    _______, _______, _______, _______, _______, _______, _______,          _______, _______, _______, _______, _______, _______, _______, _______, _______,
        _______,    _______, _______, _______, _______, _______, _______,          _______, _______, _______, _______, _______, _______, _______, _______,          _______,
        _______,    _______, _______, _______, _______, _______, _______,          _______, _______, _______, _______, _______, _______,          _______,
        _______,    _______, _______, _______, _______, _______, _______, _______,          _______, _______, _______, _______, _______,          _______, _______,
        _______,    _______, _______, _______,          _______,          _______,                   _______,          _______, _______, _______, _______, _______, _______
    ),

    [3] = LAYOUT_iso( /* Layer 3 */
        _______,    _______, _______, _______, _______, _______, _______, _______,          _______, _______, _______, _______, _______, _______, _______, _______, _______,
        _______,    _______, _______, _______, _______, _______, _______,          _______, _______, _______, _______, _______, _______, _______, _______,          _______,
        _______,    _______, _______, _______, _______, _______, _______,          _______, _______, _______, _______, _______, _______,          _______,
        _______,    _______, _______, _______, _______, _______, _______, _______,          _______, _______, _______, _______, _______,          _______, _______,
        _______,    _______, _______, _______,          _______,          _______,                   _______,          _______, _______, _______, _______, _______, _______
    )
};