/* ------------------------------------------------------------
  Titel : Projekt Rauchmelder
 --------------------------------------------------------------
 Funktion :  Zähler & Tasterentprellung
 --------------------------------------------------------------
 Prozessor : ATmega8
 Taktfrequenz externer Quarz:    3,686411 MHz
 Sprache : C
 Datum : ©2010
 Version : 1.1
 ------------------------------------------------------------ */

#include <avr/io.h>
#include <util/delay.h>
#include <avr/interrupt.h>

 ISR (ANA_COMP_vect)                                 // Interrupt  Analog Comparator
    {
    PORTB  |= 0x04;
    while(bit_is_set (PINB,2))
     {
      for(int x=0;x<=500;x++)
       {
        PORTB |= 0x02;
        _delay_ms(2.5);
        PORTB &=~ 0x02;
        _delay_ms(2.5);
       }
     _delay_ms (200);
     for(int y=0;y<=500;y++)
      {
       PORTB |= 0x02;
       _delay_ms(3);
       PORTB &=~ 0x02;
       _delay_ms(3);
      }
     }
    }

void main (void)
{
  DDRB  = 0x03;
  PORTB = 0x04;
  PORTD = 0x00;
  DDRD  = 0x00;
  ACSR  = 0x0b; // Analog Comparator Status Register
  SFIOR = 0x08; // Multiplexer ACME Bit 1

    while (1)
    {
      PORTB = 0x01;

      _delay_ms(2500);
      PORTB = 0x00;
      _delay_ms(6000);

      ADMUX = 0; // Wert PINC0 einlesen
      ADMUX = 1; // Wert PINC1 einlesen

      sei ();
    }
}