Editing ray

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#include <avr/io.h> #include <avr/interrupt.h> #define LED PC5 #define set_bit(reg, bit) (reg |= (1 << bit)) #define clear_bit(reg, bit) (reg &= ~(1 << bit)) #define toggle_bit(reg, bit) (reg ^= (1 << bit)) ISR (TIMER1_COMPA_vect) { toggle_bit(PORTC, LED); } void setup_timer() { // setup Timer/Counter Control Register // as Clear Timer on Compare TCCR1B |= 1 << WGM12; // use Timer/Counter Control Register // to start timer at FCU/64 TCCR1B |= (1 << CS10) | (1 << CS11); // use Output Compare Register // to set timer compare value OCR1A = 2499; // use Timer Interrupt Mask to // enable the compare interrupt TIMSK1 = 1 << OCIE1A; // enable global interrupts sei(); } int main() { // enable output to LED set_bit(DDRC, LED); setup_timer(); while (1) { } return 0; }

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