Interrupt wird zwei mal aufgerufen

#include <avr/io.h>

#include <util/delay.h>

#include <avr/interrupt.h>

volatile char mode;

volatile char locked = 0;

#define    DDR      DDRD

#define    PULLUP    PORTD

#define    OUT      PORTD

#define    IN      PIND

#define    DIPSWT1    PD6

#define    DIPSWT2    PD4

#define    PHOTO    PD2      // INT0

#define    MIC      PD3      // INT1

#define    TRIGGER    PD0

#define    FOCUS    PD1    

// Für externen Interrupt INT0 und INT1 ; Licht- und Soundtrigger

void trig_lock(void)

{

  cli();

  OUT &=~ (1<<FOCUS);

  _delay_ms(500);

  OUT &=~ (1<<TRIGGER);

  _delay_ms(500);

  OUT |= (1<<TRIGGER);

  _delay_ms(500);

  OUT |= (1<<FOCUS);

  _delay_ms(500);

  locked = 0;

  sei();

}

ISR(INT1_vect)

{

  trig_lock();

}

void init(void)

{

  DDR &=~ (1<<DIPSWT1) | (1<<DIPSWT2);

  PULLUP |= (1<<DIPSWT1) | (1<<DIPSWT2);

  DDR |= (1<<TRIGGER) | (1<<FOCUS);

  OUT |= (1<<TRIGGER) | (1<<FOCUS);

  sei();

/*  DDRD |= (1<<PD5) | (1<<PD0);    //LEDs

  PORTD |= (1<<PD5) | (1<<PD0);

  PORTD &=~ (1<<PD2);        // Phototransistor

  MCUCR |= (1<<ISC01) | (1<<ISC00) | (1<<ISC11) | (1<<ISC10);  // INT0, INT1 rising edge

  GIMSK |= (1<<INT0) | (1<<INT1); // enable Interrupts on INT0 and INT1

  sei();  // enable global interrupts*/

}

void main(void)

{

init();

  while (1)

    {

    if ((!(IN & (1<<DIPSWT1))) && (!(IN & (1<<DIPSWT2))))    {mode = 0;}  // Sound with Mirror-Lockup

    if ((IN & (1<<DIPSWT1)) && (!(IN & (1<<DIPSWT2))))    {mode = 1;} // Light with Mirror-Lockup

    if ((IN & (1<<DIPSWT1)) && (IN & (1<<DIPSWT2)))      {mode = 2;} // Light without Mirror-Lockup 

    if ((!(IN & (1<<DIPSWT1))) && (IN & (1<<DIPSWT2)))    {mode = 4;} // Sound without Mirror-Lockup

    if (mode == 0)

      {

      switch (mode){

        case 0:

        MCUCR |= (1<<ISC11) | (1<<ISC10);    // enable INT1

            MCUCR &=~ (1<<ISC01) | (1<<ISC00);  // disable INT0

           GIMSK |= (1<<INT1);          // enable Interrupt on INT1

           GIMSK &=~ (1<<INT0);          // disable Interrupt on INT0

        break;

      case 1:

        MCUCR &=~ (1<<ISC11) | (1<<ISC10);  // disable INT1

            MCUCR |= (1<<ISC01) | (1<<ISC00);    // enable INT0

           GIMSK &=~ (1<<INT1);          // disable Interrupt on INT1

           GIMSK |= (1<<INT0);          // enable Interrupt on INT0

        break;

        }

    /*  if (locked == 0)

        {

        OUT &=~ (1<<FOCUS);

        _delay_ms(500);

          OUT &=~ (1<<TRIGGER);

        _delay_ms(500);

        OUT |= (1<<TRIGGER);

        _delay_ms(500);

        OUT |= (1<<FOCUS);

        locked = 1;

      }*/

    }

    }

}