57 lines
1.1 KiB
C
57 lines
1.1 KiB
C
|
|
#include <stdint.h>
|
|
#include <math.h>
|
|
#include <avr/interrupt.h>
|
|
#include <avr/common.h>
|
|
#include <avr/io.h>
|
|
#include "util.h"
|
|
#include "bughal.h"
|
|
#include "music.h"
|
|
|
|
//static volatile uint16_t currentNote;
|
|
|
|
void music_init(void){
|
|
|
|
TCCR1A = 0; //TIMER1, normal, no PWM
|
|
TCCR1B = (1 << WGM12) | (1 << CS11); //CTC Mode, Clear Timer on Compare, Prescaler = 8
|
|
// OCR1A = 500; //invert with 2 KHz --> 1 KHz sound --> 8000000/8/2000
|
|
// OCR1A = 10000;
|
|
// TIMSK1 |= (1 << OCIE1A); //enable Output Compare Interrupt
|
|
TIMSK1 &= ~(1 << OCIE1A); //disable Output Compare Interrupt
|
|
return;
|
|
};
|
|
|
|
|
|
void music_setNote(uint16_t note, uint8_t octave){
|
|
|
|
|
|
cli();
|
|
if (note != NOTE_PAUSE){
|
|
//Play a Note
|
|
buzzr_up();
|
|
TIMSK1 |= (1 << OCIE1A); //enable Output Compare Interrupt
|
|
OCR1A = octave==0 ? note : note / (1 << octave);
|
|
} else { // Pause (silence)
|
|
buzzr_off();
|
|
TIMSK1 &= ~(1 << OCIE1A); //disable Output Compare Interrupt
|
|
}
|
|
sei();
|
|
return;
|
|
}
|
|
|
|
|
|
|
|
|
|
/* timer interrupt function */
|
|
ISR(TIMER1_COMPA_vect, ISR_NOBLOCK) {
|
|
|
|
// invert buzzer polarity
|
|
buzzr_inv();
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|