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qmk_firmware/quantum/audio/audio.c

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#include <stdio.h>
#include <string.h>
//#include <math.h>
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#include <avr/pgmspace.h>
#include <avr/interrupt.h>
#include <avr/io.h>
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#include "print.h"
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#include "audio.h"
#include "keymap.h"
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#include "eeconfig.h"
#define CPU_PRESCALER 8
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// -----------------------------------------------------------------------------
// Timer Abstractions
// -----------------------------------------------------------------------------
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// TIMSK3 - Timer/Counter #3 Interrupt Mask Register
// Turn on/off 3A interputs, stopping/enabling the ISR calls
#define ENABLE_AUDIO_COUNTER_3_ISR TIMSK3 |= _BV(OCIE3A)
#define DISABLE_AUDIO_COUNTER_3_ISR TIMSK3 &= ~_BV(OCIE3A)
// TCCR3A: Timer/Counter #3 Control Register
// Compare Output Mode (COM3An) = 0b00 = Normal port operation, OC3A disconnected from PC6
#define ENABLE_AUDIO_COUNTER_3_OUTPUT TCCR3A |= _BV(COM3A1);
#define DISABLE_AUDIO_COUNTER_3_OUTPUT TCCR3A &= ~(_BV(COM3A1) | _BV(COM3A0));
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// Fast PWM Mode Controls
#define TIMER_3_PERIOD ICR3
#define TIMER_3_DUTY_CYCLE OCR3A
// -----------------------------------------------------------------------------
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int voices = 0;
int voice_place = 0;
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float frequency = 0;
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int volume = 0;
long position = 0;
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float frequencies[8] = {0, 0, 0, 0, 0, 0, 0, 0};
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int volumes[8] = {0, 0, 0, 0, 0, 0, 0, 0};
bool sliding = false;
float place = 0;
uint8_t * sample;
uint16_t sample_length = 0;
bool playing_notes = false;
bool playing_note = false;
float note_frequency = 0;
float note_length = 0;
uint8_t note_tempo = TEMPO_DEFAULT;
float note_timbre = TIMBRE_DEFAULT;
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uint16_t note_position = 0;
float (* notes_pointer)[][2];
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uint16_t notes_count;
bool notes_repeat;
float notes_rest;
bool note_resting = false;
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uint8_t current_note = 0;
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uint8_t rest_counter = 0;
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#ifdef VIBRATO_ENABLE
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float vibrato_counter = 0;
float vibrato_strength = .5;
float vibrato_rate = 0.125;
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#endif
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float polyphony_rate = 0;
static bool audio_initialized = false;
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audio_config_t audio_config;
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uint16_t envelope_index = 0;
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void audio_init()
{
// Check EEPROM
if (!eeconfig_is_enabled())
{
eeconfig_init();
}
audio_config.raw = eeconfig_read_audio();
// Set port PC6 (OC3A and /OC4A) as output
DDRC |= _BV(PORTC6);
DISABLE_AUDIO_COUNTER_3_ISR;
// TCCR3A / TCCR3B: Timer/Counter #3 Control Registers
// Compare Output Mode (COM3An) = 0b00 = Normal port operation, OC3A disconnected from PC6
// Waveform Generation Mode (WGM3n) = 0b1110 = Fast PWM Mode 14 (Period = ICR3, Duty Cycle = OCR3A)
// Clock Select (CS3n) = 0b010 = Clock / 8
TCCR3A = (0 << COM3A1) | (0 << COM3A0) | (1 << WGM31) | (0 << WGM30);
TCCR3B = (1 << WGM33) | (1 << WGM32) | (0 << CS32) | (1 << CS31) | (0 << CS30);
audio_initialized = true;
}
void stop_all_notes()
{
if (!audio_initialized) {
audio_init();
}
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voices = 0;
DISABLE_AUDIO_COUNTER_3_ISR;
DISABLE_AUDIO_COUNTER_3_OUTPUT;
playing_notes = false;
playing_note = false;
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frequency = 0;
volume = 0;
for (uint8_t i = 0; i < 8; i++)
{
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frequencies[i] = 0;
volumes[i] = 0;
}
}
void stop_note(float freq)
{
if (playing_note) {
if (!audio_initialized) {
audio_init();
}
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;
}
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break;
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}
}
voices--;
if (voices < 0)
voices = 0;
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if (voice_place >= voices) {
voice_place = 0;
}
if (voices == 0) {
DISABLE_AUDIO_COUNTER_3_ISR;
DISABLE_AUDIO_COUNTER_3_OUTPUT;
frequency = 0;
volume = 0;
playing_note = false;
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}
}
}
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#ifdef VIBRATO_ENABLE
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float mod(float a, int b)
{
float r = fmod(a, b);
return r < 0 ? r + b : r;
}
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float vibrato(float average_freq) {
#ifdef VIBRATO_STRENGTH_ENABLE
float vibrated_freq = average_freq * pow(vibrato_lut[(int)vibrato_counter], vibrato_strength);
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#else
float vibrated_freq = average_freq * vibrato_lut[(int)vibrato_counter];
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#endif
vibrato_counter = mod((vibrato_counter + vibrato_rate * (1.0 + 440.0/average_freq)), VIBRATO_LUT_LENGTH);
return vibrated_freq;
}
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#endif
ISR(TIMER3_COMPA_vect)
{
float freq;
if (playing_note) {
if (voices > 0) {
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 {
freq = frequencies[voice_place];
}
#else
freq = frequencies[voice_place];
#endif
} 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 {
freq = frequency;
}
#else
freq = frequency;
#endif
}
if (envelope_index < 65535) {
envelope_index++;
}
freq = voice_envelope(freq);
if (freq < 30.517578125) {
freq = 30.52;
}
TIMER_3_PERIOD = (uint16_t)(((float)F_CPU) / (freq * CPU_PRESCALER));
TIMER_3_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre);
}
}
if (playing_notes) {
if (note_frequency > 0) {
#ifdef VIBRATO_ENABLE
if (vibrato_strength > 0) {
freq = vibrato(note_frequency);
} else {
freq = note_frequency;
}
#else
freq = note_frequency;
#endif
if (envelope_index < 65535) {
envelope_index++;
}
freq = voice_envelope(freq);
TIMER_3_PERIOD = (uint16_t)(((float)F_CPU) / (freq * CPU_PRESCALER));
TIMER_3_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre);
} else {
TIMER_3_PERIOD = 0;
TIMER_3_DUTY_CYCLE = 0;
}
note_position++;
bool end_of_note = false;
if (TIMER_3_PERIOD > 0) {
end_of_note = (note_position >= (note_length / TIMER_3_PERIOD * 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 {
DISABLE_AUDIO_COUNTER_3_ISR;
DISABLE_AUDIO_COUNTER_3_OUTPUT;
playing_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;
envelope_index = 0;
note_frequency = (*notes_pointer)[current_note][0];
note_length = ((*notes_pointer)[current_note][1] / 4) * (((float)note_tempo) / 100);
}
note_position = 0;
}
}
if (!audio_config.enable) {
playing_notes = false;
playing_note = false;
}
}
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void play_note(float freq, int vol) {
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if (!audio_initialized) {
audio_init();
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}
if (audio_config.enable && voices < 8) {
DISABLE_AUDIO_COUNTER_3_ISR;
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// Cancel notes if notes are playing
if (playing_notes)
stop_all_notes();
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playing_note = true;
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envelope_index = 0;
if (freq > 0) {
frequencies[voices] = freq;
volumes[voices] = vol;
voices++;
}
ENABLE_AUDIO_COUNTER_3_ISR;
ENABLE_AUDIO_COUNTER_3_OUTPUT;
}
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}
void play_notes(float (*np)[][2], uint16_t n_count, bool n_repeat, float n_rest)
{
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if (!audio_initialized) {
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audio_init();
}
if (audio_config.enable) {
DISABLE_AUDIO_COUNTER_3_ISR;
// Cancel note if a note is playing
if (playing_note)
stop_all_notes();
playing_notes = true;
notes_pointer = np;
notes_count = n_count;
notes_repeat = n_repeat;
notes_rest = n_rest;
place = 0;
current_note = 0;
note_frequency = (*notes_pointer)[current_note][0];
note_length = ((*notes_pointer)[current_note][1] / 4) * (((float)note_tempo) / 100);
note_position = 0;
ENABLE_AUDIO_COUNTER_3_ISR;
ENABLE_AUDIO_COUNTER_3_OUTPUT;
}
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}
bool is_playing_notes(void) {
return playing_notes;
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}
bool is_audio_on(void) {
return (audio_config.enable != 0);
}
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void audio_toggle(void) {
audio_config.enable ^= 1;
eeconfig_update_audio(audio_config.raw);
if (audio_config.enable)
audio_on_user();
}
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void audio_on(void) {
audio_config.enable = 1;
eeconfig_update_audio(audio_config.raw);
audio_on_user();
}
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void audio_off(void) {
audio_config.enable = 0;
eeconfig_update_audio(audio_config.raw);
}
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#ifdef VIBRATO_ENABLE
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// Vibrato rate functions
void set_vibrato_rate(float rate) {
vibrato_rate = rate;
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}
void increase_vibrato_rate(float change) {
vibrato_rate *= change;
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}
void decrease_vibrato_rate(float change) {
vibrato_rate /= change;
}
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#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 /* VIBRATO_STRENGTH_ENABLE */
#endif /* VIBRATO_ENABLE */
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// 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(uint8_t tempo) {
note_tempo = tempo;
}
void decrease_tempo(uint8_t tempo_change) {
note_tempo += tempo_change;
}
void increase_tempo(uint8_t tempo_change) {
if (note_tempo - tempo_change < 10) {
note_tempo = 10;
} else {
note_tempo -= tempo_change;
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}
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}