/* Filename: Excercise 3
Author: Renier Del Rosario
Date: 10/5/2024
Description: Timer Interrupt
*/

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

// volatile unsigned char overflowCounter = 0;

int main(void)
{
    cli();                                // disable all interrupts
    DDRA = 0x80;                          // PORTA output
    PORTA = 0x00;                         // clear PORTA
    TCNT0 = 0x00;                         // clear the timer
    TCCR0A = 0b01000010;                      // Mode 2: CTC (Clear Timer on Compare Match)
    TCCR0B = 0x05;                        // 1024 prescaler
    OCR0A = 7812;                         // Compare value for 0.5 second at 16 MHz clock (1024 prescaler)


    TIMSK0 = (1 << OCIE0A);               // Enable Timer/Counter0 Output Compare Match A interrupt

   
    sei();                                // Enable interrupts globally

    while (1)
    {
      ;
    }
}

ISR(TIMER0_COMPA_vect)
{
    PORTA ^= 0x80;
    // _delay_ms(500);        

}