µC Software Schwierigkeiten bei Eingang/Ausgang

#define F_CPU 1000000

#include <avr/io.h>

#include <util/delay.h>

#include <avr/interrupt.h>

int main(void)

{

  DDRD = ( 1 << PD5 )|( 1 << PD6 )|( 1 << PD7 )|(1<<PD3); //ausgänge

  PORTD |= (1 << PD0) | (1<<PD1);   //eingänge

  while(1)

  {

    if(!(PIND & (1 << PD0)))   //eingang PD0 auf GND

    {

      PORTD |= ( 1 << PD5 );

      _delay_ms(100);

      PORTD |= ( 1 << PD6 );

      _delay_ms(100);

      PORTD |= ( 1 << PD7 );

      _delay_ms(100);

      PORTD &= ~(( 1 << PD5 ) | ( 1 << PD6 ) | ( 1 << PD7 ));

      while(!(PIND & (1 << PD0))); 

    }

    if(!(PIND & (1 << PD1)))   //eingang PD1 auf GND

    {

      PORTD |= ( 1 << PD5 );

      _delay_ms(100);

      PORTD |= ( 1 << PD6 );

      _delay_ms(100);

      PORTD |= ( 1 << PD3 );

      _delay_ms(100);

      PORTD &= ~(( 1 << PD5 ) | ( 1 << PD6 ) | ( 1 << PD3 ));

      while(!(PIND & (1 << PD1)));

    }       

  }

}