Ang Bayan Kong Sinilangan Tune With Arduino In Pure C (Passive Buzzer)

test.c

/*
    Thanks to this post: https://balau82.wordpress.com/2014/10/15/using-a-buzzer-with-arduino-in-pure-c/
*/
#ifndef F_CPU
#define F_CPU 16000000UL //set frequency
#endif

#define __DELAY_BACKWARD_COMPATIBLE__

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

int tones[17] = {
  247,
  330,
  330,
  370,
  330,
  370,
  392,
  392,
  392,
  440,
  494,
  440,
  440,
  370,
  392,
  370,
  330      
};

int toneDelays[17] = {
  500,
  500,
  500,
  200,
  250,
  450,
  500,
  500,
  200,
  250,
  450,
  500,
  500,
  200,
  250,
  450,
  1100
};

void tone(unsigned long frequency) {
    unsigned long timer_frequency = (F_CPU + (256/2)) / 256;
    OCR0A = (timer_frequency + ((frequency*2)/2)) / (frequency*2);
    TCCR0A = _BV(COM0A0) | _BV(WGM01);
}
 
int main() {

    DDRD |= _BV(DDD6); //digital pin 6
    TCCR0B = _BV(CS02);

    for(;;) {
        for(int x=0; x < 17; x++) {
            tone(tones[x]);
            _delay_ms(toneDelays[x]);
        }
        _delay_ms(400);
    }

    return 0;
}