152 lines
3.0 KiB
C
152 lines
3.0 KiB
C
/*
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* GccApplication1.c
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*
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* Created: 10/8/2019 2:07:13 PM
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* Author : lenfesty
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*/
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#include "main.h"
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uint8_t play_flag = 0;
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uint8_t button_flag = 0;
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ISR(INT0_vect) {
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// Disable interrupts
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cli();
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// Notify of button press
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button_flag = 1;
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}
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/*
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* Pin Definitions:
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* PB2 -> OC0A output
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* PB3 -> OC1A output
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* PB0 -> Switch Input
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*/
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void gpio_init() {
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// Piezo Out
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DDRB |= (1 << DDB2) | (1 << DDB3);
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// Switch Input Setup
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DDRD &= ~(1 << DDD2);
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PORTD |= (1 << PORTD2);
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// Configure Interrupt Stuff
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// Set falling edge for INT0
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MCUCR |= (1 << ISC01) | (0 << ISC00);
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// Enable INT0
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GIMSK |= (1 << INT0);
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}
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void timer_init( ) {
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/* --- Timer 0 (8 bit) --- */
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// Set Compare mode A to toggle, and waveform generation mode to CTC
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TCCR0A = (0 << COM0A1) | (1 << COM0A0) | (1 << WGM01) | (0 << WGM00);
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// Nothing else relevant here, without setting notes
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/* --- Timer 1 (16 bit) --- */
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// Set compare mode A to toggle
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TCCR1A = (0 << COM1A1) | (1 << COM1A0);
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// Set waveform gen mode to CTC
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TCCR1B = (1 << WGM12);
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}
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void play_beat() {
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static uint8_t duration_left[2] = {0};
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static uint16_t song_location[2] = {0};
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// If at end of song, restart
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if (song_location[0] == SPEAKER0_LEN) {
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song_location[0] = 0;
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song_location[1] = 0;
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}
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// Set note
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for (uint8_t speaker = 0; speaker < 2; speaker++) {
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if (duration_left[speaker] == 0) {
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// Move to next note
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// Read in next note from program memory
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uint16_t beat;
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beat_t* p_beat;
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// Select from correct song
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if (speaker == 0) {
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beat = pgm_read_word((PGM_P*) &song_speaker0[song_location[speaker]]);
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} else {
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beat = pgm_read_word((PGM_P*) &song_speaker1[song_location[speaker]]);
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}
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p_beat = (beat_t*) &beat;
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// Set duration left after this beat
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duration_left[speaker] = p_beat->duration - 1;
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// Increment song location for next note
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song_location[speaker]++;
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// actually set note
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play_note(*p_beat, speaker);
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} else {
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// Keep handling current note
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// do nothing, it is set correctly
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duration_left[speaker]--;
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}
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}
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_delay_ms(BEAT_LENGTH * (1 - REST_FRACTION)); // Play note
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// Rest note if at the end of the interval
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for (uint8_t speaker = 0; speaker < 2; speaker++) {
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if (duration_left[speaker] == 0) {
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// End of note, pause here
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beat_t beat = {
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.note = rest,
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.duration = 0,
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.octave = 0, // octave doesn't matter, its a rest
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};
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play_note(beat, speaker);
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} else {
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// Note does not end, change nothing
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}
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}
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_delay_ms(BEAT_LENGTH * REST_FRACTION);
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}
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int main(void)
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{
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gpio_init();
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timer_init();
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sei();
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/* Replace with your application code */
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while (1)
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{
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if (play_flag) {
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play_beat();
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}
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if (button_flag) {
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button_flag = 0;
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beat_t beat = {
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.note = rest,
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};
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play_note(beat, 0);
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play_note(beat, 1);
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_delay_ms(100);
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sei();
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}
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if ( bit_is_clear(PIND, PIND2) && (play_flag == 0)) {
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cli();
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play_flag = 1;
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_delay_ms(100);
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sei();
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}
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}
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}
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