[AVR] ATtiny 13 hardware PWM

    //miszczo

    #include <avr/io.h>
    #include <avr/interrupt.h>
    #include  <util/delay.h>

    int main(void)

    {
            DDRB = (1<<PB0)|(1<<PB1)|(1<<PB2)|(1<<PB3); //pb jako wyjscia

            TCCR0A = (1<<WGM00)|(1<<WGM01); //fast pwm
            TCCR0A = (1<<COM0A1)|(COM0B1); // Clear OC0A on Compare Match, set OC0A at TOP
            TCCR0B = (1<<CS00); //preskaler w1
            TIMSK0 = (1<<OCIE0A)|(1<<OCIE0B);
            OCR0A=1;
               OCR0B=1;

            uint8_t i;
            while(1)
            {
                    for(i=0;i<255;i++)
                    {
                            OCR0A=i;
                            OCR0B=i;
                            if(i>50)_delay_ms(3);
                            else _delay_ms(10);
                    }
                    for(i=255;i;i--)
                    {
                            OCR0A=i;
                            OCR0B=i;
                            if(i>50)_delay_ms(3);
                            else _delay_ms(10);

                    }

            }


    }