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