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-rw-r--r--quantum/audio/audio.c607
1 files changed, 607 insertions, 0 deletions
diff --git a/quantum/audio/audio.c b/quantum/audio/audio.c
new file mode 100644
index 0000000000..e85370d958
--- /dev/null
+++ b/quantum/audio/audio.c
@@ -0,0 +1,607 @@
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+#include <avr/pgmspace.h>
+#include <avr/interrupt.h>
+#include <avr/io.h>
+#include "print.h"
+#include "audio.h"
+#include "keymap_common.h"
+
+#include "eeconfig.h"
+
+#ifdef VIBRATO_ENABLE
+ #include "vibrato_lut.h"
+#endif
+
+#define PI 3.14159265
+
+#define CPU_PRESCALER 8
+
+#ifdef PWM_AUDIO
+ #include "wave.h"
+ #define SAMPLE_DIVIDER 39
+ #define SAMPLE_RATE (2000000.0/SAMPLE_DIVIDER/2048)
+ // Resistor value of 1/ (2 * PI * 10nF * (2000000 hertz / SAMPLE_DIVIDER / 10)) for 10nF cap
+
+ float places[8] = {0, 0, 0, 0, 0, 0, 0, 0};
+ uint16_t place_int = 0;
+ bool repeat = true;
+#endif
+
+void delay_us(int count) {
+ while(count--) {
+ _delay_us(1);
+ }
+}
+
+int voices = 0;
+int voice_place = 0;
+float frequency = 0;
+int volume = 0;
+long position = 0;
+
+float frequencies[8] = {0, 0, 0, 0, 0, 0, 0, 0};
+int volumes[8] = {0, 0, 0, 0, 0, 0, 0, 0};
+bool sliding = false;
+
+int max = 0xFF;
+float sum = 0;
+float place = 0;
+
+uint8_t * sample;
+uint16_t sample_length = 0;
+// float freq = 0;
+
+bool notes = false;
+bool note = false;
+float note_frequency = 0;
+float note_length = 0;
+float note_tempo = TEMPO_DEFAULT;
+float note_timbre = TIMBRE_DEFAULT;
+uint16_t note_position = 0;
+float (* notes_pointer)[][2];
+uint16_t notes_count;
+bool notes_repeat;
+float notes_rest;
+bool note_resting = false;
+
+uint8_t current_note = 0;
+uint8_t rest_counter = 0;
+
+#ifdef VIBRATO_ENABLE
+float vibrato_counter = 0;
+float vibrato_strength = .5;
+float vibrato_rate = 0.125;
+#endif
+
+float polyphony_rate = 0;
+
+bool inited = false;
+
+audio_config_t audio_config;
+
+uint16_t envelope_index = 0;
+
+void audio_toggle(void) {
+ audio_config.enable ^= 1;
+ eeconfig_update_audio(audio_config.raw);
+}
+
+void audio_on(void) {
+ audio_config.enable = 1;
+ eeconfig_update_audio(audio_config.raw);
+}
+
+void audio_off(void) {
+ audio_config.enable = 0;
+ eeconfig_update_audio(audio_config.raw);
+}
+
+#ifdef VIBRATO_ENABLE
+// Vibrato rate functions
+
+void set_vibrato_rate(float rate) {
+ vibrato_rate = rate;
+}
+
+void increase_vibrato_rate(float change) {
+ vibrato_rate *= change;
+}
+
+void decrease_vibrato_rate(float change) {
+ vibrato_rate /= change;
+}
+
+#ifdef VIBRATO_STRENGTH_ENABLE
+
+void set_vibrato_strength(float strength) {
+ vibrato_strength = strength;
+}
+
+void increase_vibrato_strength(float change) {
+ vibrato_strength *= change;
+}
+
+void decrease_vibrato_strength(float change) {
+ vibrato_strength /= change;
+}
+
+#endif
+
+#endif
+
+// Polyphony functions
+
+void set_polyphony_rate(float rate) {
+ polyphony_rate = rate;
+}
+
+void enable_polyphony() {
+ polyphony_rate = 5;
+}
+
+void disable_polyphony() {
+ polyphony_rate = 0;
+}
+
+void increase_polyphony_rate(float change) {
+ polyphony_rate *= change;
+}
+
+void decrease_polyphony_rate(float change) {
+ polyphony_rate /= change;
+}
+
+// Timbre function
+
+void set_timbre(float timbre) {
+ note_timbre = timbre;
+}
+
+// Tempo functions
+
+void set_tempo(float tempo) {
+ note_tempo = tempo;
+}
+
+void decrease_tempo(uint8_t tempo_change) {
+ note_tempo += (float) tempo_change;
+}
+
+void increase_tempo(uint8_t tempo_change) {
+ if (note_tempo - (float) tempo_change < 10) {
+ note_tempo = 10;
+ } else {
+ note_tempo -= (float) tempo_change;
+ }
+}
+
+void audio_init() {
+
+ /* check signature */
+ if (!eeconfig_is_enabled()) {
+ eeconfig_init();
+ }
+ audio_config.raw = eeconfig_read_audio();
+
+ #ifdef PWM_AUDIO
+ PLLFRQ = _BV(PDIV2);
+ PLLCSR = _BV(PLLE);
+ while(!(PLLCSR & _BV(PLOCK)));
+ PLLFRQ |= _BV(PLLTM0); /* PCK 48MHz */
+
+ /* Init a fast PWM on Timer4 */
+ TCCR4A = _BV(COM4A0) | _BV(PWM4A); /* Clear OC4A on Compare Match */
+ TCCR4B = _BV(CS40); /* No prescaling => f = PCK/256 = 187500Hz */
+ OCR4A = 0;
+
+ /* Enable the OC4A output */
+ DDRC |= _BV(PORTC6);
+
+ TIMSK3 &= ~_BV(OCIE3A); // Turn off 3A interputs
+
+ TCCR3A = 0x0; // Options not needed
+ TCCR3B = _BV(CS31) | _BV(CS30) | _BV(WGM32); // 64th prescaling and CTC
+ OCR3A = SAMPLE_DIVIDER - 1; // Correct count/compare, related to sample playback
+ #else
+ DDRC |= _BV(PORTC6);
+
+ TIMSK3 &= ~_BV(OCIE3A); // Turn off 3A interputs
+
+ TCCR3A = (0 << COM3A1) | (0 << COM3A0) | (1 << WGM31) | (0 << WGM30);
+ TCCR3B = (1 << WGM33) | (1 << WGM32) | (0 << CS32) | (1 << CS31) | (0 << CS30);
+ #endif
+
+ inited = true;
+}
+
+void stop_all_notes() {
+ if (!inited) {
+ audio_init();
+ }
+ voices = 0;
+ #ifdef PWM_AUDIO
+ TIMSK3 &= ~_BV(OCIE3A);
+ #else
+ TIMSK3 &= ~_BV(OCIE3A);
+ TCCR3A &= ~_BV(COM3A1);
+ #endif
+ notes = false;
+ note = false;
+ frequency = 0;
+ volume = 0;
+
+ for (int i = 0; i < 8; i++) {
+ frequencies[i] = 0;
+ volumes[i] = 0;
+ }
+}
+
+void stop_note(float freq) {
+ if (note) {
+ if (!inited) {
+ audio_init();
+ }
+ #ifdef PWM_AUDIO
+ freq = freq / SAMPLE_RATE;
+ #endif
+ for (int i = 7; i >= 0; i--) {
+ if (frequencies[i] == freq) {
+ frequencies[i] = 0;
+ volumes[i] = 0;
+ for (int j = i; (j < 7); j++) {
+ frequencies[j] = frequencies[j+1];
+ frequencies[j+1] = 0;
+ volumes[j] = volumes[j+1];
+ volumes[j+1] = 0;
+ }
+ break;
+ }
+ }
+ voices--;
+ if (voices < 0)
+ voices = 0;
+ if (voice_place >= voices) {
+ voice_place = 0;
+ }
+ if (voices == 0) {
+ #ifdef PWM_AUDIO
+ TIMSK3 &= ~_BV(OCIE3A);
+ #else
+ TIMSK3 &= ~_BV(OCIE3A);
+ TCCR3A &= ~_BV(COM3A1);
+ #endif
+ frequency = 0;
+ volume = 0;
+ note = false;
+ }
+ }
+}
+
+#ifdef VIBRATO_ENABLE
+
+float mod(float a, int b)
+{
+ float r = fmod(a, b);
+ return r < 0 ? r + b : r;
+}
+
+float vibrato(float average_freq) {
+ #ifdef VIBRATO_STRENGTH_ENABLE
+ float vibrated_freq = average_freq * pow(VIBRATO_LUT[(int)vibrato_counter], vibrato_strength);
+ #else
+ float vibrated_freq = average_freq * VIBRATO_LUT[(int)vibrato_counter];
+ #endif
+ vibrato_counter = mod((vibrato_counter + vibrato_rate * (1.0 + 440.0/average_freq)), VIBRATO_LUT_LENGTH);
+ return vibrated_freq;
+}
+
+#endif
+
+ISR(TIMER3_COMPA_vect) {
+ if (note) {
+ #ifdef PWM_AUDIO
+ if (voices == 1) {
+ // SINE
+ OCR4A = pgm_read_byte(&sinewave[(uint16_t)place]) >> 2;
+
+ // SQUARE
+ // if (((int)place) >= 1024){
+ // OCR4A = 0xFF >> 2;
+ // } else {
+ // OCR4A = 0x00;
+ // }
+
+ // SAWTOOTH
+ // OCR4A = (int)place / 4;
+
+ // TRIANGLE
+ // if (((int)place) >= 1024) {
+ // OCR4A = (int)place / 2;
+ // } else {
+ // OCR4A = 2048 - (int)place / 2;
+ // }
+
+ place += frequency;
+
+ if (place >= SINE_LENGTH)
+ place -= SINE_LENGTH;
+
+ } else {
+ int sum = 0;
+ for (int i = 0; i < voices; i++) {
+ // SINE
+ sum += pgm_read_byte(&sinewave[(uint16_t)places[i]]) >> 2;
+
+ // SQUARE
+ // if (((int)places[i]) >= 1024){
+ // sum += 0xFF >> 2;
+ // } else {
+ // sum += 0x00;
+ // }
+
+ places[i] += frequencies[i];
+
+ if (places[i] >= SINE_LENGTH)
+ places[i] -= SINE_LENGTH;
+ }
+ OCR4A = sum;
+ }
+ #else
+ if (voices > 0) {
+ float freq;
+ if (polyphony_rate > 0) {
+ if (voices > 1) {
+ voice_place %= voices;
+ if (place++ > (frequencies[voice_place] / polyphony_rate / CPU_PRESCALER)) {
+ voice_place = (voice_place + 1) % voices;
+ place = 0.0;
+ }
+ }
+ #ifdef VIBRATO_ENABLE
+ if (vibrato_strength > 0) {
+ freq = vibrato(frequencies[voice_place]);
+ } else {
+ #else
+ {
+ #endif
+ freq = frequencies[voice_place];
+ }
+ } else {
+ if (frequency != 0 && frequency < frequencies[voices - 1] && frequency < frequencies[voices - 1] * pow(2, -440/frequencies[voices - 1]/12/2)) {
+ frequency = frequency * pow(2, 440/frequency/12/2);
+ } else if (frequency != 0 && frequency > frequencies[voices - 1] && frequency > frequencies[voices - 1] * pow(2, 440/frequencies[voices - 1]/12/2)) {
+ frequency = frequency * pow(2, -440/frequency/12/2);
+ } else {
+ frequency = frequencies[voices - 1];
+ }
+
+
+ #ifdef VIBRATO_ENABLE
+ if (vibrato_strength > 0) {
+ freq = vibrato(frequency);
+ } else {
+ #else
+ {
+ #endif
+ freq = frequency;
+ }
+ }
+
+ if (envelope_index < 65535) {
+ envelope_index++;
+ }
+ freq = voice_envelope(freq);
+
+ if (freq < 30.517578125)
+ freq = 30.52;
+ ICR3 = (int)(((double)F_CPU) / (freq * CPU_PRESCALER)); // Set max to the period
+ OCR3A = (int)((((double)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre); // Set compare to half the period
+ }
+ #endif
+ }
+
+ // SAMPLE
+ // OCR4A = pgm_read_byte(&sample[(uint16_t)place_int]);
+
+ // place_int++;
+
+ // if (place_int >= sample_length)
+ // if (repeat)
+ // place_int -= sample_length;
+ // else
+ // TIMSK3 &= ~_BV(OCIE3A);
+
+
+ if (notes) {
+ #ifdef PWM_AUDIO
+ OCR4A = pgm_read_byte(&sinewave[(uint16_t)place]) >> 0;
+
+ place += note_frequency;
+ if (place >= SINE_LENGTH)
+ place -= SINE_LENGTH;
+ #else
+ if (note_frequency > 0) {
+ float freq;
+
+ #ifdef VIBRATO_ENABLE
+ if (vibrato_strength > 0) {
+ freq = vibrato(note_frequency);
+ } else {
+ #else
+ {
+ #endif
+ freq = note_frequency;
+ }
+
+ if (envelope_index < 65535) {
+ envelope_index++;
+ }
+ freq = voice_envelope(freq);
+
+ ICR3 = (int)(((double)F_CPU) / (freq * CPU_PRESCALER)); // Set max to the period
+ OCR3A = (int)((((double)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre); // Set compare to half the period
+ } else {
+ ICR3 = 0;
+ OCR3A = 0;
+ }
+ #endif
+
+
+ note_position++;
+ bool end_of_note = false;
+ if (ICR3 > 0)
+ end_of_note = (note_position >= (note_length / ICR3 * 0xFFFF));
+ else
+ end_of_note = (note_position >= (note_length * 0x7FF));
+ if (end_of_note) {
+ current_note++;
+ if (current_note >= notes_count) {
+ if (notes_repeat) {
+ current_note = 0;
+ } else {
+ #ifdef PWM_AUDIO
+ TIMSK3 &= ~_BV(OCIE3A);
+ #else
+ TIMSK3 &= ~_BV(OCIE3A);
+ TCCR3A &= ~_BV(COM3A1);
+ #endif
+ notes = false;
+ return;
+ }
+ }
+ if (!note_resting && (notes_rest > 0)) {
+ note_resting = true;
+ note_frequency = 0;
+ note_length = notes_rest;
+ current_note--;
+ } else {
+ note_resting = false;
+ #ifdef PWM_AUDIO
+ note_frequency = (*notes_pointer)[current_note][0] / SAMPLE_RATE;
+ note_length = (*notes_pointer)[current_note][1] * (note_tempo / 100);
+ #else
+ envelope_index = 0;
+ note_frequency = (*notes_pointer)[current_note][0];
+ note_length = ((*notes_pointer)[current_note][1] / 4) * (note_tempo / 100);
+ #endif
+ }
+ note_position = 0;
+ }
+
+ }
+
+ if (!audio_config.enable) {
+ notes = false;
+ note = false;
+ }
+}
+
+void play_note(float freq, int vol) {
+
+ if (!inited) {
+ audio_init();
+ }
+
+if (audio_config.enable && voices < 8) {
+ TIMSK3 &= ~_BV(OCIE3A);
+ // Cancel notes if notes are playing
+ if (notes)
+ stop_all_notes();
+ note = true;
+ envelope_index = 0;
+ #ifdef PWM_AUDIO
+ freq = freq / SAMPLE_RATE;
+ #endif
+ if (freq > 0) {
+ frequencies[voices] = freq;
+ volumes[voices] = vol;
+ voices++;
+ }
+
+ #ifdef PWM_AUDIO
+ TIMSK3 |= _BV(OCIE3A);
+ #else
+ TIMSK3 |= _BV(OCIE3A);
+ TCCR3A |= _BV(COM3A1);
+ #endif
+}
+
+}
+
+void play_notes(float (*np)[][2], uint16_t n_count, bool n_repeat, float n_rest) {
+
+ if (!inited) {
+ audio_init();
+ }
+
+if (audio_config.enable) {
+ TIMSK3 &= ~_BV(OCIE3A);
+ // Cancel note if a note is playing
+ if (note)
+ stop_all_notes();
+ notes = true;
+
+ notes_pointer = np;
+ notes_count = n_count;
+ notes_repeat = n_repeat;
+ notes_rest = n_rest;
+
+ place = 0;
+ current_note = 0;
+ #ifdef PWM_AUDIO
+ note_frequency = (*notes_pointer)[current_note][0] / SAMPLE_RATE;
+ note_length = (*notes_pointer)[current_note][1] * (note_tempo / 100);
+ #else
+ note_frequency = (*notes_pointer)[current_note][0];
+ note_length = ((*notes_pointer)[current_note][1] / 4) * (note_tempo / 100);
+ #endif
+ note_position = 0;
+
+
+ #ifdef PWM_AUDIO
+ TIMSK3 |= _BV(OCIE3A);
+ #else
+ TIMSK3 |= _BV(OCIE3A);
+ TCCR3A |= _BV(COM3A1);
+ #endif
+}
+
+}
+
+#ifdef PWM_AUDIO
+void play_sample(uint8_t * s, uint16_t l, bool r) {
+ if (!inited) {
+ audio_init();
+ }
+
+ if (audio_config.enable) {
+ TIMSK3 &= ~_BV(OCIE3A);
+ stop_all_notes();
+ place_int = 0;
+ sample = s;
+ sample_length = l;
+ repeat = r;
+
+ TIMSK3 |= _BV(OCIE3A);
+ }
+}
+#endif
+
+//------------------------------------------------------------------------------
+// Override these functions in your keymap file to play different tunes on
+// startup and bootloader jump
+__attribute__ ((weak))
+void play_startup_tone()
+{
+}
+
+
+
+__attribute__ ((weak))
+void play_goodbye_tone()
+{
+
+}
+//------------------------------------------------------------------------------
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