Analog komparator - Interrupt

#include <avr/io.h>

#include <avr/interrupt.h>

#include <lcd.h>

#include <util/delay.h>

#include <compat/deprecated.h>

volatile uint16_t counter = 0;

void delay_ms(int delay) {

        int i;

        for (i=0;i<=delay;i++) {

                _delay_ms(1);

        }

}

void init_usart(void) 

{ 

 uint8_t HighByte = (416 >> 8);

 uint8_t LowByte = 416 & 0xFF;

 UBRRL |= LowByte;

 UBRRH |= HighByte;

 UCSRB = (1<<TXEN) | (1<<RXEN); 

 UCSRC = (1<<URSEL) | (1<<UCSZ1) | (1<<UCSZ0); 

} 

void send_char(unsigned char s) 

{ 

 while (!(UCSRA & (1<<UDRE))); 

 UDR = s; 

} 

void send_string(char *s) 

{ 

 while(*s != '\0') 

  { 

   send_char(*s); 

   s++; 

  } 

} 

SIGNAL(SIG_ANA_COMP)

{

  //TCNT1 * 0.000004;

  send_string("Interrupt");

}

get_cap()

{

  TCNT1 = 0x00;    // Timerregister 0 setzen

  PORTD |= (1<<PD5);  // High setzen um Kondensator zu laden

  send_string("Die Kapazität beträgt:\n\n");

}

int main(void)

{

 sei();

 init_usart();

 DDRD |= (1<<PD5);

 DDRD &= ~(1<<PD7) | ~(1<<PD6);

 TCCR1B = (1 << CS10) | (1 << CS11);  //Prescaler 64

 ACSR |= (1<<ACIE) | (1<<ACIS0) | (1<<ACIS1); //Interrupt enable rising edges

  while(1)

  {

    PORTD &= ~(1<<PD5);  

    delay_ms(1000);

    get_cap();

    delay_ms(1000);

  }

}