/* Copyright © 2020 tyrolyean
 *
 * 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 3 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/>.
 */

#define F_CPU 16000000UL

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <avr/wdt.h>
#include <util/delay.h>
#include <avr/interrupt.h>

uint8_t mcusr_mirror __attribute__ ((section (".noinit")));
void get_mcusr(void) \
  __attribute__((naked)) \
  __attribute__((section(".init3")));

void get_mcusr(void)
{
  mcusr_mirror = MCUSR;
  MCUSR = 0;
  wdt_disable();
}

int routine();
int main(){

	/* Disable interrupts during initialisation phase */	
	cli();

	DDRF = 0xFF;
	DDRK |= (0x01<<0);
	DDRK |= (0x01<<1);
	PORTF = 0x00;
	PORTK |= (0x01<<0);
	PORTK |= (0x01<<1);
	
	PORTK &= ~(0x01<<1);
	_delay_us(10);
	PORTK |= (0x01<<1);
	_delay_us(10);

	sei();
	/* Enable the hardware watchdog. In case the microcontroller fails to 
	 * finish it's task within the specified time, the watchdog will reset
	 * the atmel cookie.
	 */
	wdt_enable(WDTO_1S);	
        
	while(1){
		wdt_reset();
                if(routine() < 0){
                }
        }

        return 0;
}

int routine(){

	for(size_t i = 0; i < 256; i++){
		PORTF = (0xFF & i);
		PORTK &= ~(0x01<<0);
		PORTK |= (0x01<<0);
	}
	_delay_ms(10);
        return 0;
}