#define F_CPU 11059200UL	// 11.0592 MHz
#include <avr/io.h>
#include <avr/interrupt.h>

#define SETBIT(ADDRESS,BIT) ((ADDRESS) |= (1<<(BIT)))	// nastaví bit
#define CLRBIT(ADDRESS,BIT) ((ADDRESS) &= ~(1<<(BIT)))	// nuluje bit
//#define NEGBIT(ADDRESS,BIT) ((ADDRESS) ^= (1<<(BIT)))	// neguje bit
//#define TSTBIT(ADDRESS,BIT) ((ADDRESS) & (1<<(BIT)))	// testuje bit

#define PWM1_PORT PORTA
#define PWM1_DDR  DDRA
#define PWM1_BIT  PA1	// PA1 = ADC1


void pwm1Start(void) //nastaveni PWM a preruseni 
{
	// Timer0, FastPWM, clk/64 => Fpwm = 11.0592e6/64/256 = 675Hz

	TCCR0 |= 1<<WGM01 | 1<<WGM00 | 1<<CS01 | 1<<CS00;
		// clock source: clkI/O/64 (From prescaler)
		// Mode 3 (Fast PWM), TOP=0xFF

	TIMSK |= 1<<OCIE0 | 1<<TOIE0;
		// Timer/Counter0 Output Compare Match Interrupt Enable
		// Timer/Counter0 Overflow Interrupt Enable
} 


void main(void)
{
	// začátek programu

	OCR0 = 70;		// generovaná hodnota
	pwm1Start();

	sei(); //povoleno preruseni 

	for(;;)
	{
		// nekonečná smyčka
	
	}
}


ISR(TIMER0_OVF_vect)
{
	// Timer/Counter0 Overflow

	if(OCR0) SETBIT(PWM1_PORT, PWM1_BIT);
		// pokud je generovaná hodnota nenulová, nastaví se výstup na "1"
}

ISR (TIMER0_COMP_vect)
{
	// Timer/Counter0 Output Compare Match

	CLRBIT(PWM1_PORT, PWM1_BIT);
}