63 lines
1.2 KiB
C
63 lines
1.2 KiB
C
#include <pentabug/music.h>
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#include <avr/io.h>
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#include <pentabug/timer.h>
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#include <pentabug/lifecycle.h>
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#include <pentabug/hal.h>
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static void tune(void) {
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buzzer_inv();
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}
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void set_note(uint16_t note, uint8_t octave) {
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if(note != NOTE_PAUSE) {
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// bring buzzer to a state where inverting it creates sound
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buzzer_up();
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// start timer with doubled frequency of tone we want to play
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start_timer(PRESCALE_8, note >> octave, tune);
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} else {
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// do nothing when paused
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stop_note();
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}
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}
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void stop_note(void) {
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// turn buzzer off to save energy
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buzzer_off();
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// we do not need the timer anymore
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stop_timer();
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}
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void play_melody(const uint16_t notes[], size_t len, uint8_t octave, int speed) {
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int pause = speed / 20;
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uint8_t length = 4;
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size_t i;
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for(i = 0; i < len; ++i) {
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if(notes[i] == MLDY_PAUSE) {
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// user defined pause
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++i;
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wait_ms(notes[i]);
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} else if(notes[i] == MLDY_LENGTH) {
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// sets length for next tone
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++i;
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length = notes[i];
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} else {
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// play note
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set_note(notes[i], octave);
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test_stop_app();
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wait_ms(speed * 4 / length);
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// pause after note
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stop_note();
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test_stop_app();
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wait_ms(pause);
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// reset length for next note
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length = 4;
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}
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}
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}
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