AD-Wandler läuft nicht

define  F_CPU 8000000UL

#include <avr/io.h>

#include <util/delay.h>

#include "Lcd-routines.h"

#include <stdlib.h>

int main(void)

{

  void ADC_Init(void){

    ADMUX = (1<<REFS0);            //AVcc als Referenz

    ADCSRA = (1<<ADPS2) | (1<<ADPS1);    //Frequenzvorteiler

    ADCSRA |= (1<<ADEN);          //ADC Aktivieren

    //Dummy readaot

    ADCSRA |= (1<<ADSC);

    while (ADCSRA & (1<<ADSC)){}

    (void) ADCW;

  }

  uint16_t ADC_Read( uint8_t channel ){

    //Kanal wählen

    ADMUX = (ADMUX & ~(0x1F)) | (channel & 0x1F);

    ADCSRA |= (1<<ADSC); //Eine Wandllung sigel conversion

    while (ADCSRA & (1<<ADSC)){} //Auf Abschluss warten

    return ADCW;

  }

        DDRA = 0b00000000;

  PORTA = 0b00000000;

  DDRC = 0b11111111;

  lcd_init();

  char out0[16];

  char out1[16];

  uint16_t infrarot;

  uint16_t test=120;

    while (1) 

    {

    lcd_clear();

    lcd_string("Testausgabe");

    itoa(test,out0,10);

    lcd_setcursor(0,2);

    lcd_string(out0);

    _delay_ms(1000);

    lcd_clear(),

    infrarot=ADC_Read(0);

    itoa(infrarot,out1,10);

    lcd_setcursor(0,0);

    lcd_string("Abstand");

    lcd_setcursor(0,2);

    lcd_string(out1);

    _delay_ms(1000);

    lcd_clear();  

    }

}