#include <inttypes.h>
#include <stdlib.h>
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/signal.h>
#include "proggi.h"

int main (void)
{

  led_init();
  taster_init();

	
  /*versuche interrup auszuloesen
  DDRB &= ~(1<<PB2);    // 0 input
  PORTB |= (1<<PB2);    // 1 pull-Up
  //GIFR &= ~(1<<ISC2);
  */
	
  return 0;
}


void led_init() {

  DDRD |= (1<<PD7);	// output led
  TCCR2 = (1<<WGM21) | (1<<WGM20) |(1<<COM21) | (0<<COM20) | (0<<CS22) | (0<<CS21) | (1<<CS20);
}


void taster_init() {
 
  DDRB &= ~(1<<PB2); 	// 0 input

	
  MCUCSR |= (1<<ISC2);//rising edge causes interrupt
  //MCUCSR &= ~(1<<ISC2);//falling edge (beides ausprobiert)
	
  GICR |= (1<<ISC2); //enable
		
  sei();
}

SIGNAL (SIG_INTERRUPT2) //event handler
{
  uint8_t sreg;
  sreg = SREG; //save global interrupt flag
  OCR2 = 0xFF; //brightness
  SREG = sreg; //restore global interrupt flag
}