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

ISR(TIMER0_OVF_vect) {
	static uint8_t i=0;
	++i;
	if (i==10) {
		i=0;
		TCNT0=160;
		PORTB^=1<<7; /* flip LED7 */
	}
}

int main() {
	DDRB=0xFF;
	PORTB=0xFF; /* alle LEDs uit */
	DDRA=0x00;

	TCNT0=160;
	TCCR0&=~(1<<WGM01|1<<WGM00|1<<CS01);
	TCCR0|=1<<CS02|1<<CS00;
	TIMSK|=1<<TOIE0;

	sei();

	while(1) {	
		if (PINA&1<<6) 
			PORTB|=1<<6;
		else
			PORTB&=~(1<<6);
	}

	return 0;
}