static inline void initTimer0(void) {
    // Timer Counter Control Register B
    // Must b4 /64 or more for ISR timing
    TCCR0B |= (1 << CS00) | (1 << CS01);

    // Timer Counter Interrupt Mask Register
    // both output compare interrupts
    TIMSK0 |= ((1 << OCIE0A) | (1 << OCIE1B));

    // Timer Counter Overflow Interrupt Enable
    TIMSK0 |= (1 << TOIE0);

    sei();
}

/* Timer/Counter0 Overflow */
// called whenever TCNT0 overflows
ISR(TIMER0_OVF_vect) {
    PORTB |= (1 << 0);
    OCR0A = brightnessA;
}

// ISR fired when a match occurs
ISR(TIMER0_COMPA_vect) {
    PORTB ^= (1 << 0);
}

int main(void)
{
    setup();
    int d = 10;

    while (1)
    {
        for (int i = 0; i < 255; i++) {
            _delay_ms(d);
            brightnessA = i;
        }


    }
}

DDRB |= 1 << 0;