carlhako virtual wall

#define F_CPU 14745600

#include <stdio.h>
#include <stdlib.h>

#include <avr/io.h>
#include <avr/interrupt.h>
#include <inttypes.h>


// PIN DEFINITIONS:

void realtimeclock_setup() {
  // setup Timer0:
  // CTC (Clear Timer on Compare Match mode)
  // TOP set by OCR0A register
  TCCR0A |= (1<<WGM01);
  // no pre scaler
  TCCR0B |= (1<<CS00);
  // generate 70.217khz which i can use every 2nd cycle to generate aprox 35khz (35108hz)
  OCR0A = 210;
  // enable interrupt on compare event
  TIMSK0 |= (1<<OCIE0A);
}

volatile int8_t counter1;
volatile int8_t counter2;

SIGNAL(SIG_OUTPUT_COMPARE0A) {
  counter1++;
  counter2++;
}

int main() {
  realtimeclock_setup();

  // set pin as output
  DDRC |= (1<<PC5);

  // turn on interrupt handler
        sei();
        int8_t led_status;
        while(1) {
                if (counter1 == 2) { // generate 35khz carrier signal
                        if (led_status) PORTC |= (1<<PC5); // turn on ir led
                }
                if (counter1 > 3) {
                        PORTC &= ~(1<<PC5); // turn off ir led
                        counter1 = 0; // reset counter1
                }

                if (counter2 == 34) { // generate 500hz signal
                        led_status = 1;
                        //counter2 = 0;
                }
                if (counter2 > 69) {
                        led_status = 0;
                        counter2 = 0;
                }

        }


  return 0;
}