qmk_firmware/keyboards/machine_industries/m4_a/keymaps/default/keymap.c

// Copyright 2022 naut
// SPDX-License-Identifier: GPL-2.0-or-later

#include QMK_KEYBOARD_H

// Defines names for use in layer keycodes and the keymap
enum layer_names {
    _BASE
};

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
    /* Base */
    [_BASE] = LAYOUT(
        KC_1,   KC_2,   KC_3,
        KC_0
    )
};