#include <avr/io.h>
#include <avr/sleep.h>
#include <avr/interrupt.h>

uint8_t volatile pina;
uint8_t volatile pinb;

ISR(PCINT1_vect, ISR_ALIASOF(PCINT0_vect));
ISR(PCINT0_vect){
	uint8_t difa = (pina ^ PINA) & PINA;
	uint8_t difb = (pinb ^ PINB) & PINB;
	
	if(difa == 1) {
		// S1 gedrückt: blau heller
		if (OCR0A >= 25) {
			OCR0A = OCR0A - 25;
		}
	} else if (difa == 2) {
		//S2 gedrückt: blau schwaecher
	  	if (OCR0A <= 230) {
			OCR0A = OCR0A + 25;
		}
	} else if (difa == 4) {
		//S3 gedrückt: grün heller
		if (OCR0B >= 25) {
			OCR0B = OCR0B - 25;
		}
	} else if (difa == 8) {
		//S4 gedrückt: grüner schwaecher
	  	if (OCR0B <= 230) {
			OCR0B = OCR0B + 25;
		}
	} else if (difb == 2) {
		//S5 gedrückt: rot heller
		if (OCR1A >= 25) {
			OCR1A = OCR1A - 25;
		}
	} 
	else if (difb == 1) {
		//S6 gedrückt: rot schwaecher
	  	if (OCR1A <= 230) {
			OCR1A = OCR1A + 25;
		}
	}
	
	pina = PINA;
	pinb = PINB;
}



// Set fuses for 8MHz internal clock with slow rising power
FUSES =
{
	.low = (FUSE_SUT0 & FUSE_CKSEL3 & FUSE_CKSEL2 & FUSE_CKSEL0),
	.high = FUSE_SPIEN,
	.extended = EFUSE_DEFAULT
};



int main()
{
	OCR0A = 255;
	OCR0B = 255;
	OCR1A = 255;

	TCCR0B = (1 << CS01) | (1 << CS00);
	TCCR0A = (1 << WGM01) | (1 << WGM00) | (1 << COM0A1) | (1 << COM0A0) | (1 << COM0B1) | (1 << COM0B0);

	// 16 bit zähler
	TCCR1B = (1 << CS11) | (1 << CS10) | (1 << WGM12);
	TCCR1A = (1 << WGM10) | (1 << COM1A1) | (1 << COM1A0);



	// Set A7, A6 and B2 as output
	DDRA = (1 << DDA7) | (1 << DDA6);
	DDRB = (1 << DDB2);

	pina = PINA;
	pinb = PINB;
	
	// Enable Pin Change Interrupts for switches
	GIMSK = (1 << PCIE1) |(1 << PCIE0);
	PCMSK0 = (1 << PCINT0) | (1 << PCINT1) | (1 << PCINT2) | (1 << PCINT3);
	PCMSK1 = (1 << PCINT8) | (1 << PCINT9);
	
	sei();

	while (1) {
	//	sleep_enable();
	}
	return 0;
}