Also das ist das Programm:
Code:
#define F_CPU 8000000

#include <avr/io.h> 
#include <stdio.h>
#include <stdbool.h>
#include<util/delay.h>




#define T1 0x04
#define T2 0x08
#define T3 0x10


uint8_t direction;
uint8_t step[8] = {0xEE, 0xBC, 0xE8, 0xBA, 0xEE, 0xBC, 0xE8, 0xBA};//Halbschritt Steuerung
uint8_t rev_step[8] = {0xBE, 0xEA, 0xB8, 0xEC, 0xBE, 0xEA, 0xB8, 0xBC};//Halbschritt Steuerung
                 

    


//***********************************************

void rotate(direction)
{
   
   int i;
   if(direction)
	{
          PORTD &=~(0x20);
	  PORTD &=~(0x40);
	  PORTD |= 0x80 ;
	   
	 for(i=0;i<8;i++)
	  {	  
	   _delay_ms(80);
	   PORTA = step[i];
      };    
	}
   else 
    {
	 PORTD &=~(0x80);
	 PORTD &=~(0x40); 
	 PORTD |= 0x20;
	 for(i=0;i<8;i++)
	  {
	   _delay_ms(80);
	   PORTA = rev_step[i]; 
	  };
	}
}	  
	 
//************************************************


int main()
{
 uint8_t start;
 uint8_t release1; 
 uint8_t release2; 
 uint8_t release3; 
 
 release1 = 0x01; 
 release2 = 0x01; 
 release3 = 0x01; 
 
 direction = true;
 start = false;
 

 DDRA |= 0xFE;//Port A pin 1-7 als Ausgang setzen
 PORTA = 0x00;//pull up's auf low setzen
 DDRD &= ~(0x1c);//Port D; PIN 2, 3 und 4 als Eingang setzen
 //PORTD &= ~(0x1c);//pull up's auf low setzen
 DDRD |= 0xE0;
 
 while(1)
 {
  if((PIND & T1)&&(release1 == 0x01)) //Taster1 gedrückt
  { 
   release1 = 0x00;
   direction = true;
   start= true;
  }
   
 else 
  { 
   if (!(PIND & T1)) 
   { 
     release1 = 0x01;
   } 
  } 
 
 
 if((PIND & T2)&&(release2 == 0x01)) //Taster2 gedrückt
  { 
    release2 = 0x00;
    direction = false;
    start = true;
  }
  else 
  { 
   if (!(PIND & T2)) 
    { 
     
	 release2 = 0x01;
	   
    } 
  }
  
 if((PIND & T3)&&(release3 == 0x01))//Taster3 gedückt 
  {
   PORTD |= 0x40;
   PORTD &=~(0x80) ;
   PORTD &=~(0x20);
   release3 = 0x00; 
   PORTA &=~(0x80);
   start = false;
  }
   
 else
  { 
   if (!(PIND & T3)) 
   { 
     release3 = 0x01;
	 
   } 
  }          

 
 if(start == true)
  {
   	
	rotate(direction);
  }

}	 
return 0; 
}
wie ihr sieht das ganze will ich mit Tastensteuerung machen.