#include
void timer0_init()
{
//Toggle 0C0A on compare match
TCCR0A |= (1 << COM0A0);
//No prescaler, CTC mode
TCCR0B |= (1 << WGM01)|(1 << CS00);
//Initialize counter
TCNT0 = 0;
//Compare register value set to 199 for 40kHz
OCR0A = 199;
}
int main(void)
{
//PD0 output
DDRD = 0b00000001;
timer0_init();
while(1)
{
//switch PD0 high when compare match
if (OCF0A == 1)
{
//PD0 HIgh
PORTD = 0b00000001;
}
//Disable interupt when match occur
TIFR0 = OCF0A;
}
}