#include<avr/io.h>


int main (void) 
{
  DDRB = 0xFF;      // port B output
  DDRD = 0xFF;      // port D output
  
  PORTD = ~0xff;
  
  MCUCSR = 0x80;   // = 0b10000000  = 128
  MCUCSR = 0x80;
 
  int x = 0;
  
  // Activate ADC with Prescaler 16 --> 1Mhz/16 = 62.5kHz
  ADCSRA = _BV(ADEN) | _BV(ADPS2);
  //ADCSRA = (1<<ADEN) | (1<<ADPS1) | (1<<ADPS0);	//neu eingefügt
  for (;;) {  
    // Select pin ADC0 using MUX
    ADMUX = 0;
  
    //Start conversion
    //ADCSRA |= _BV(ADSC);
    ADCSRA |= (1<<ADSC);						//neu eingefügt
    // wait until converstion completed
    while (ADCSRA & _BV(ADSC) ) {}
    
    // get converted value
	x = ADCL;
	x += (ADCH<<8); 
    ADCSRA|=(1<<ADIF);   

    // output the higher 8 bits
    PORTB = ~x>>2;
	
  }
}