Nerdful_com

/*
Make music with piezo (piezoelectric buzzer).
Put the buzzer on MCU pin 15 (PB1)
Does not use libnerdkits in makefile use # to comment out makefile lines related
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*/
#define F_CPU 8000000UL // 8MHz
#include <avr/io.h>
#include <util/delay.h>
void play_tone(uint16_t delay, uint8_t duration) {
  uint16_t tmp = 100 * duration;
  uint16_t delaysm = delay / 50;
  uint16_t cycles = tmp / delaysm;

  while(cycles > 0) {
    PORTB |= (1<<PB1);
    _delay_us(delay);
    PORTB &= ~(1<<PB1);
    _delay_us(delay);
    cycles--;
  }
}
int main() {
// oscillator @ 8MHz.
OSCCAL = 176;
DDRB |= (1<<PB1);
while(1) {
play_tone(1000, 50);
play_tone(950, 50);
play_tone(900, 50);
play_tone(850, 50);
play_tone(800, 50);
play_tone(750, 50);
play_tone(700, 50);
play_tone(650, 50);
play_tone(600, 50);
play_tone(550, 50);
play_tone(500, 50);
play_tone(450, 50);
play_tone(400, 50);
play_tone(350, 50);
play_tone(300, 50);
play_tone(250, 50);
_delay_ms(2000);
}
return 0;
}