void init_ADC(void);
unsigned char start_ADC(void);

void setup(){
  Serial.begin(9600);
  init_ADC();
  start_ADC();
  unsigned char x;
  x = start_ADC();
  while(1)
  {
    x = start_ADC();
    
  }
}
void init_port(){
  volatile char *portc_dir=(volatile char *)0x27;
  *portc_dir=0x10;
}
void inut_port(unsigned char x){
  volatile char *portc_input=(volatile char *)0x26;
  *portc_input=start_ADC();
  Serial.println(*portc_input,HEX);
}
void init_ADC()
{
  volatile char *admux  = (volatile char *)0x7C;
  volatile char *adcsra = (volatile char *)0x7A;
  *admux  = 0xC0;
  *adcsra = 0x87;//10000111
}

unsigned char start_ADC()
{
  volatile char *adcsra = (volatile char *)0x7A;
  *adcsra = *adcsra | 0x40;//starting the ADC 
  return *adcsra;
}


void loop(){
 
}