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qmk_firmware/quantum/audio/audio_arm.c

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/* Copyright 2016 Jack Humbert
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "audio.h"
#include "ch.h"
#include "hal.h"
#include <string.h>
#include "print.h"
#include "keymap.h"
#include "eeconfig.h"
// -----------------------------------------------------------------------------
int voices = 0;
int voice_place = 0;
float frequency = 0;
float frequency_alt = 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;
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;
uint16_t note_position = 0;
float (* notes_pointer)[][2];
uint16_t notes_count;
bool notes_repeat;
bool note_resting = false;
uint16_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;
static bool audio_initialized = false;
audio_config_t audio_config;
uint16_t envelope_index = 0;
bool glissando = true;
#ifndef STARTUP_SONG
#define STARTUP_SONG SONG(STARTUP_SOUND)
#endif
float startup_song[][2] = STARTUP_SONG;
#define DAC_BUFFER_SIZE 100U
#ifndef DAC_SAMPLE_MAX
#define DAC_SAMPLE_MAX 4095U
#endif
#define DAC_SAMPLE_RATE 30000U
GPTConfig gpt7cfg1 = {
.frequency = DAC_SAMPLE_RATE,
.callback = NULL,
.cr2 = TIM_CR2_MMS_1, /* MMS = 010 = TRGO on Update Event. */
.dier = 0U
};
static const dacsample_t dac_buffer[DAC_BUFFER_SIZE] = {
// First half is max, second half is 0
// [0 ... DAC_BUFFER_SIZE/2-1] = DAC_SAMPLE_MAX,
// [DAC_BUFFER_SIZE/2 ... DAC_BUFFER_SIZE -1] = 0,
// max 4095
0x800,0x880,0x900,0x97f,0x9fd,0xa78,0xaf1,0xb67,
0xbda,0xc49,0xcb3,0xd19,0xd79,0xdd4,0xe29,0xe78,
0xec0,0xf02,0xf3c,0xf6f,0xf9b,0xfbf,0xfdb,0xfef,
0xffb,0xfff,0xffb,0xfef,0xfdb,0xfbf,0xf9b,0xf6f,
0xf3c,0xf02,0xec0,0xe78,0xe29,0xdd4,0xd79,0xd19,
0xcb3,0xc49,0xbda,0xb67,0xaf1,0xa78,0x9fd,0x97f,
0x900,0x880,0x800,0x77f,0x6ff,0x680,0x602,0x587,
0x50e,0x498,0x425,0x3b6,0x34c,0x2e6,0x286,0x22b,
0x1d6,0x187,0x13f,0xfd,0xc3,0x90,0x64,0x40,
0x24,0x10,0x4,0x0,0x4,0x10,0x24,0x40,
0x64,0x90,0xc3,0xfd,0x13f,0x187,0x1d6,0x22b,
0x286,0x2e6,0x34c,0x3b6,0x425,0x498,0x50e,0x587,
0x602,0x680,0x6ff,0x77f
};
dacsample_t dac_buffer_lr[1] = { DAC_SAMPLE_MAX / 2 };
float dac_if[8] = {0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0};
/*
* DAC streaming callback.
*/
static void end_cb1(DACDriver * dacp, dacsample_t * samples, size_t pos) {
(void)dacp;
(void)pos;
//for (uint8_t i = 0; i < DAC_BUFFER_SIZE; i++) {
//samples[0] = (dac_buffer[dac_i] + dac_buffer[dac_j]) / 2;
//}
uint16_t sample_sum = 0;
for (int i = 0; i < voices; i++) {
dac_if[i] = dac_if[i] + ((frequencies[i]*(float)DAC_BUFFER_SIZE)/(float)DAC_SAMPLE_RATE*1.5);
while(dac_if[i] >= DAC_BUFFER_SIZE)
dac_if[i] = dac_if[i] - DAC_BUFFER_SIZE;
sample_sum += dac_buffer[(uint8_t)round(dac_if[i]) % DAC_BUFFER_SIZE] / voices;
}
if (voices > 0) {
samples[0] = sample_sum;
} else {
samples[0] = DAC_SAMPLE_MAX;
}
}
/*
* DAC error callback.
*/
static void error_cb1(DACDriver *dacp, dacerror_t err) {
(void)dacp;
(void)err;
chSysHalt("DAC failure");
}
static const DACConfig dac1cfg1 = {
.init = DAC_SAMPLE_MAX,
.datamode = DAC_DHRM_12BIT_RIGHT
};
static const DACConversionGroup dacgrpcfg1 = {
.num_channels = 1U,
.end_cb = end_cb1,
.error_cb = error_cb1,
.trigger = DAC_TRG(0)
};
void audio_init() {
if (audio_initialized) {
return;
}
// Check EEPROM
#if defined(STM32_EEPROM_ENABLE) || defined(PROTOCOL_ARM_ATSAM) || defined(EEPROM_SIZE)
if (!eeconfig_is_enabled()) {
eeconfig_init();
}
audio_config.raw = eeconfig_read_audio();
#else // ARM EEPROM
audio_config.enable = true;
#ifdef AUDIO_CLICKY_ON
audio_config.clicky_enable = true;
#endif
#endif // ARM EEPROM
palSetPadMode(GPIOA, 5, PAL_MODE_INPUT_ANALOG );
// palSetPadMode(GPIOA, 4, PAL_MODE_INPUT_ANALOG );
palSetPadMode(GPIOA, 4, PAL_MODE_OUTPUT_PUSHPULL );
palSetPad(GPIOA, 4);
// dacStart(&DACD1, &dac1cfg1);
// dacStartConversion(&DACD1, &dacgrpcfg1, dac_buffer_lr, 1);
dacStart(&DACD2, &dac1cfg1);
dacStartConversion(&DACD2, &dacgrpcfg1, dac_buffer_lr, 1);
gptStart(&GPTD6, &gpt7cfg1);
gptStartContinuous(&GPTD6, 2U);
// gptStart(&GPTD7, &gpt7cfg1);
// gptStartContinuous(&GPTD7, 2U);
audio_initialized = true;
if (audio_config.enable) {
PLAY_SONG(startup_song);
} else {
stop_all_notes();
}
}
void stop_all_notes() {
dprintf("audio stop all notes");
if (!audio_initialized) {
audio_init();
}
voices = 0;
gptStopTimer(&GPTD8);
playing_notes = false;
playing_note = false;
frequency = 0;
frequency_alt = 0;
volume = 0;
for (uint8_t i = 0; i < 8; i++)
{
frequencies[i] = 0;
volumes[i] = 0;
}
}
void stop_note(float freq) {
dprintf("audio stop note freq=%d", (int)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;
}
break;
}
}
voices--;
if (voices < 0) {
voices = 0;
}
if (voice_place >= voices) {
voice_place = 0;
}
if (voices == 0) {
frequency = 0;
frequency_alt = 0;
volume = 0;
playing_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
void play_note(float freq, int vol) {
dprintf("audio play note freq=%d vol=%d", (int)freq, vol);
if (!audio_initialized) {
audio_init();
}
if (audio_config.enable && voices < 8) {
// Cancel notes if notes are playing
if (playing_notes) {
stop_all_notes();
}
playing_note = true;
envelope_index = 0;
if (freq > 0) {
frequencies[voices] = freq;
volumes[voices] = vol;
voices++;
}
}
}
void play_notes(float (*np)[][2], uint16_t n_count, bool n_repeat) {
if (!audio_initialized) {
audio_init();
}
if (audio_config.enable) {
// 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;
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;
}
}
bool is_playing_notes(void) {
return playing_notes;
}
bool is_audio_on(void) {
return (audio_config.enable != 0);
}
void audio_toggle(void) {
audio_config.enable ^= 1;
eeconfig_update_audio(audio_config.raw);
if (audio_config.enable) {
audio_on_user();
}
}
void audio_on(void) {
audio_config.enable = 1;
eeconfig_update_audio(audio_config.raw);
audio_on_user();
}
void audio_off(void) {
stop_all_notes();
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 /* VIBRATO_STRENGTH_ENABLE */
#endif /* VIBRATO_ENABLE */
// 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;
}
}