Add copyright and licensing information

Copyright (c) <year> <owner> All rights reserved.

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are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice,

this list of conditions and the following disclaimer.

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this list of conditions and the following disclaimer in the documentation

and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE

LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

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# Copyright 2023 Birte Kristina Friesel

#

# SPDX-License-Identifier: BSD-2-Clause

MCU_AVRDUDE ?= t2313

MCU_AVRGCC ?= attiny2313a

AVRDUDE_PROGRAMMER ?= usbasp

/*

 * Copyright 2023 Birte Kristina Friesel

 *

 * SPDX-License-Identifier: BSD-2-Clause

 */

#include <avr/io.h>

#include <stdlib.h>

/*

 * Copyright 2023 Birte Kristina Friesel

 *

 * SPDX-License-Identifier: BSD-2-Clause

 */

#include <avr/io.h>

#include <avr/interrupt.h>

#include <avr/wdt.h>

/*

 * Copyright 2023 Birte Kristina Friesel

 *

 * SPDX-License-Identifier: BSD-2-Clause

 */

#ifndef __SYSTEM_H__

#define __SYSTEM_H__