/* ========================================================================== */
/*                                                                            */
/*   Filename.c                                                               */
/*   (c) 2001 Author                                                          */
/*                                                                            */
/*   Description                                                              */
/*                                                                            */
/* ========================================================================== */
#include <avr/io.h>
#include <avr/sleep.h>
#include <avr/interrupt.h>

uint8_t pina;
uint8_t pinb;

ISR(PCINT0_vect){

	uint8_t difa = (pina ^ PINA) & PINA;
	uint8_t difb = (pinb ^ PINB) & PINB;

	if (difa == 1) {
		// S1 gedrückt -> aktiviere Blau ?
		PORTB = PORTB ^ 4;
	} else if (difa == 2) {
		// S2 gedrückt -> aktiviere ??
		PORTA = PORTA ^ 128;
	} else if (difa == 4) {
		// S3 gedrückt -> aktiviere ??
		PORTA = PORTA ^ 64;
	} else if (difa == 8) {
		// S4 gedrückt -> alle an
		PORTA |= (1 << PORTA6) | (1 << PORTA7);
		PORTB |= (1 << PORTB2);
	} else if (difb == 1 || difb == 2) {
		// S5 oder S6 gedrückt -> alle aus
		PORTA = (1 << PORTA4) | (1 << PORTA5);
		PORTB = (1 << PORTB3);
	}
	
	pina = PINA;
	pinb = PINB;

}

// Set fuses for 8MHz internal clock with slow rising power
FUSES =
{
	.low = (FUSE_SUT1 & FUSE_CKSEL3 & FUSE_CKSEL2 & FUSE_CKSEL0),
	.high = FUSE_SPIEN,
	.extended = EFUSE_DEFAULT
};

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

	PORTB = 0;
	PORTA = 0;

	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;
}