void ADC6();
void Tasten();


int main(void)
{

//Variablen Init
unsigned char t4;			//zählt die Durchläufe der Hauptroutine nach gedrückter Taste
unsigned char taste;			//Freigabe für Tastendruck / taste = 0 -> Tastendrücken erlaubt / taste = 1 -> Tastendrücken verboten		
unsigned int AD_Tasten;			//Variable für den Wert des AD-Wandlers

//PORTS Init
PORTB |= (1 << PB2);
DDRB  |= (1 << PB2);

PORTD |= ((1 << PD6) | (1 << PD7));
DDRD  |= ((1 << PD6) | (1 << PD7));

//AD Init
ADMUX  |= ((1<<MUX1) | (1 << MUX2));									
ADMUX  &= ~((1 << MUX0)|(1 << MUX3));
ADCSRA |= ((1 << ADEN)|(1 << ADPS0)|(1 << ADPS1)|(1 << ADPS2));
ADMUX  |= (1 << REFS0);
ADMUX  &= ~(1 << REFS1);





	for(;;){

	ADC6();
	Tasten();

	if((taste == 1) && (AD_Tasten == 0))
	t4++;

	if((AD_Tasten == 0) && (t4 >= 5))
	{
	taste = 0;
	t4 = 0;
	}

		}
}

void Tasten()
{

	if((AD_Tasten >= 19) && (AD_Tasten <= 26) && (taste == 0)) 
	{

		PORTD &= ~(1 << PD6);

		taste = 1;
	}
	
	if((AD_Tasten >= 169) && (AD_Tasten <= 177) && (taste == 0))
	{

		PORTD &= ~(1 << PD7);

		taste = 1;

	}
	
	if((AD_Tasten >= 191) && (AD_Tasten <= 199) && (taste == 0))
	{

		PORTB &= ~(1 << PB2);

		taste = 1;
	}
}


void ADC6()		
{
	int i = 0;
	int result = 0;

	
	ADCSRA |= (1<<ADSC);		//Eine AD-Wandlung zur Initialisierung
	while (ADCSRA & (1<<ADSC))
	{
	;
	}
	result = ADCW;
	result = 0;


	for(i=0;i<8;i++)
	{
	ADCSRA |= (1<<ADSC);		//AD Wandlung
	while (ADCSRA & (1<<ADSC))
	{
	;
	}
	result +=ADCW;
	}


	ADCSRA &= ~(1<<ADSC);		//AD Wandlung deaktivieren

	result /= 8;
	AD_Tasten = result;
	AD_Tasten = (AD_Tasten >> 2);

}