Aufgabe 1
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#include <asf.h>
#include "interrupt.h"

int main (void)
{
	sei();

	//Konfiguration Pins
	DDRB |= (1<<PINB);

	//Konfiguration Timer
	TCCR0 |= (1<<CS02) | (1<<CS00); //prescale 1024
	TIMSK |= (1<<TOIE0); //interrupt an


	TCNT0 = 255; //1ms warten
	Count = 0;
	State = 0;


	while (1)
	{

	}
}


ISR (TIMER0_OVF_vect)
{
	if (State == 0)
	{
		State = 1;
		PORTB |= (1<<PB0);
	}

	else
	{
		State = 0;
		PORTB &= ~(1<<PB0);
	}

	TCNT0 = 255; //1ms warten
}

Aufgabe 2
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#include <asf.h>
#include "interrupt.h"

int main (void)
{
	sei();

	//Konfiguration Ports
	DDRB = 0xFF; //alle als ausgang

	//Konfiguration ADC
	ADMUX |= (1<<REFS0) | (1<<ADLAR);
	ADCSRA |= (1<< ADEN) | (1<<ADIE);


	while (1)
	{
		ADCSRA |= (1<<ADSC); //ADC starten
	}

}

ISR (ADC_vect)
{
	PORTB = ADCH; //ADC Ergebniss bei PORTB ausgeben
}

Aufgabe 3
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#include <asf.h>
#include "interrupt.h"

volatile int Count;
volatile int State;

int main (void)
{
	sei();

	//Konfiguration Ports
	DDRB |= (1<<PINB);

	//Konfiguration Timer
	TCCR0 |= (1<<CS02) | (1<<CS00); //prescale 1024
	TIMSK |= (1<<TOIE0); //interrupt an

	//Konfiguration ADC
	ADMUX |= (1<<REFS0) | (1<<ADLAR);
	ADCSRA |= (1<< ADEN);


	TCNT0 = 255; //0,25s warten
	Count = 0;
	State = 0;


	while (1)
	{

	}

}

ISR (TIMER0_OVF_vect)
{
	//HIGH
	//Es wird High, dannach wird 1ms gewartet
	if (State == 0)
	{
		State = 1;
		PORTB |= (1<<PB0);
		TCNT0 = 255; //1ms warten
	}

	//LOW
	else
	{
		ADCSRA |= (1<<ADSC); //ADC starten
		while ( !( ADCSRA & (1<<ADIF)) );

		State = 0;
		PORTB &= ~(1<<PB0);
		TCNT0 = 255-ADCH; //1ms warten
	}
}

Aufgabe 3+
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#include <asf.h>
#include "interrupt.h"

volatile int Count;
volatile int State;

int main (void)
{
	sei();

	//Konfiguration Ports
	DDRB |= (1<<PINB);

	//Konfiguration Timer
	TCCR0 |= (1<<CS01); //prescale 8
	TIMSK |= (1<<TOIE0); //interrupt an

	//Konfiguration ADC
	ADMUX |= (1<<REFS0) | (1<<ADLAR);
	ADCSRA |= (1<< ADEN);


	TCNT0 = 255; //8µs warten
	Count = 0;
	State = 0;


	while (1)
	{

	}

}

ISR (TIMER0_OVF_vect)
{
	//HIGH
	//Es wird High, dannach wird 1ms gewartet
	if (State == 0)
	{
		State = 1;
		PORTB |= (1<<PB0);
		TCNT0 = 255; //8µs warten
	}

	//LOW
	else
	{
		ADCSRA |= (1<<ADSC); //ADC starten
		while ( !( ADCSRA & (1<<ADIF)) );

		State = 0;
		PORTB &= ~(1<<PB0);
		TCNT0 = 255-ADCH; //8µs-2ms warten
	}
}