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458 lines
9.8 KiB
458 lines
9.8 KiB
/* Copyright 2016 Jack Humbert
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "audio.h"
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#include "ch.h"
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#include "hal.h"
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#include <string.h>
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#include "print.h"
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#include "keymap.h"
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#include "eeconfig.h"
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// -----------------------------------------------------------------------------
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int voices = 0;
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int voice_place = 0;
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float frequency = 0;
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float frequency_alt = 0;
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int volume = 0;
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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};
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bool sliding = false;
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float place = 0;
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uint8_t * sample;
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uint16_t sample_length = 0;
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bool playing_notes = false;
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bool playing_note = false;
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float note_frequency = 0;
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float note_length = 0;
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uint8_t note_tempo = TEMPO_DEFAULT;
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float note_timbre = TIMBRE_DEFAULT;
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uint16_t note_position = 0;
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float (* notes_pointer)[][2];
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uint16_t notes_count;
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bool notes_repeat;
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bool note_resting = false;
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uint16_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;
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float vibrato_strength = .5;
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float vibrato_rate = 0.125;
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#endif
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float polyphony_rate = 0;
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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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bool glissando = true;
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#ifndef STARTUP_SONG
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#define STARTUP_SONG SONG(STARTUP_SOUND)
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#endif
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float startup_song[][2] = STARTUP_SONG;
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#define DAC_BUFFER_SIZE 100U
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#ifndef DAC_SAMPLE_MAX
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#define DAC_SAMPLE_MAX 4095U
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#endif
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#define DAC_SAMPLE_RATE 30000U
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GPTConfig gpt7cfg1 = {
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.frequency = DAC_SAMPLE_RATE,
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.callback = NULL,
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.cr2 = TIM_CR2_MMS_1, /* MMS = 010 = TRGO on Update Event. */
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.dier = 0U
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};
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static const dacsample_t dac_buffer[DAC_BUFFER_SIZE] = {
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// First half is max, second half is 0
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// [0 ... DAC_BUFFER_SIZE/2-1] = DAC_SAMPLE_MAX,
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// [DAC_BUFFER_SIZE/2 ... DAC_BUFFER_SIZE -1] = 0,
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// max 4095
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0x800,0x880,0x900,0x97f,0x9fd,0xa78,0xaf1,0xb67,
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0xbda,0xc49,0xcb3,0xd19,0xd79,0xdd4,0xe29,0xe78,
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0xec0,0xf02,0xf3c,0xf6f,0xf9b,0xfbf,0xfdb,0xfef,
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0xffb,0xfff,0xffb,0xfef,0xfdb,0xfbf,0xf9b,0xf6f,
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0xf3c,0xf02,0xec0,0xe78,0xe29,0xdd4,0xd79,0xd19,
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0xcb3,0xc49,0xbda,0xb67,0xaf1,0xa78,0x9fd,0x97f,
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0x900,0x880,0x800,0x77f,0x6ff,0x680,0x602,0x587,
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0x50e,0x498,0x425,0x3b6,0x34c,0x2e6,0x286,0x22b,
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0x1d6,0x187,0x13f,0xfd,0xc3,0x90,0x64,0x40,
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0x24,0x10,0x4,0x0,0x4,0x10,0x24,0x40,
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0x64,0x90,0xc3,0xfd,0x13f,0x187,0x1d6,0x22b,
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0x286,0x2e6,0x34c,0x3b6,0x425,0x498,0x50e,0x587,
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0x602,0x680,0x6ff,0x77f
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};
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dacsample_t dac_buffer_lr[1] = { DAC_SAMPLE_MAX / 2 };
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float dac_if[8] = {0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0};
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/*
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* DAC streaming callback.
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*/
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static void end_cb1(DACDriver * dacp, dacsample_t * samples, size_t pos) {
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(void)dacp;
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(void)pos;
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//for (uint8_t i = 0; i < DAC_BUFFER_SIZE; i++) {
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//samples[0] = (dac_buffer[dac_i] + dac_buffer[dac_j]) / 2;
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//}
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uint16_t sample_sum = 0;
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int working_voices = voices;
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if (working_voices > 3)
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working_voices = 3;
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for (int i = 0; i < working_voices; i++) {
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dac_if[i] = dac_if[i] + ((frequencies[i]*(float)DAC_BUFFER_SIZE)/(float)DAC_SAMPLE_RATE*1.5);
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while(dac_if[i] >= DAC_BUFFER_SIZE)
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dac_if[i] = dac_if[i] - DAC_BUFFER_SIZE;
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sample_sum += dac_buffer[(uint8_t)round(dac_if[i]) % DAC_BUFFER_SIZE] / working_voices;
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}
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if (working_voices > 0) {
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samples[0] = sample_sum;
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} else {
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samples[0] = DAC_SAMPLE_MAX;
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}
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}
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/*
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* DAC error callback.
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*/
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static void error_cb1(DACDriver *dacp, dacerror_t err) {
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(void)dacp;
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(void)err;
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chSysHalt("DAC failure");
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}
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static const DACConfig dac1cfg1 = {
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.init = DAC_SAMPLE_MAX,
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.datamode = DAC_DHRM_12BIT_RIGHT
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};
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static const DACConversionGroup dacgrpcfg1 = {
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.num_channels = 1U,
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.end_cb = end_cb1,
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.error_cb = error_cb1,
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.trigger = DAC_TRG(0)
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};
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void audio_init() {
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if (audio_initialized) {
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return;
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}
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// Check EEPROM
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#if defined(STM32_EEPROM_ENABLE) || defined(PROTOCOL_ARM_ATSAM) || defined(EEPROM_SIZE)
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if (!eeconfig_is_enabled()) {
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eeconfig_init();
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}
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audio_config.raw = eeconfig_read_audio();
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#else // ARM EEPROM
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audio_config.enable = true;
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#ifdef AUDIO_CLICKY_ON
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audio_config.clicky_enable = true;
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#endif
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#endif // ARM EEPROM
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palSetPadMode(GPIOA, 5, PAL_MODE_INPUT_ANALOG );
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// palSetPadMode(GPIOA, 4, PAL_MODE_INPUT_ANALOG );
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palSetPadMode(GPIOA, 4, PAL_MODE_OUTPUT_PUSHPULL );
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palSetPad(GPIOA, 4);
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// dacStart(&DACD1, &dac1cfg1);
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// dacStartConversion(&DACD1, &dacgrpcfg1, dac_buffer_lr, 1);
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dacStart(&DACD2, &dac1cfg1);
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dacStartConversion(&DACD2, &dacgrpcfg1, dac_buffer_lr, 1);
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gptStart(&GPTD6, &gpt7cfg1);
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gptStartContinuous(&GPTD6, 2U);
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// gptStart(&GPTD7, &gpt7cfg1);
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// gptStartContinuous(&GPTD7, 2U);
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audio_initialized = true;
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if (audio_config.enable) {
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PLAY_SONG(startup_song);
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} else {
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stop_all_notes();
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}
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}
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void stop_all_notes() {
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dprintf("audio stop all notes");
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if (!audio_initialized) {
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audio_init();
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}
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voices = 0;
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gptStopTimer(&GPTD8);
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playing_notes = false;
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playing_note = false;
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frequency = 0;
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frequency_alt = 0;
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volume = 0;
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for (uint8_t i = 0; i < 8; i++)
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{
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frequencies[i] = 0;
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volumes[i] = 0;
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}
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}
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void stop_note(float freq) {
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dprintf("audio stop note freq=%d", (int)freq);
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if (playing_note) {
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if (!audio_initialized) {
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audio_init();
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}
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for (int i = 7; i >= 0; i--) {
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if (frequencies[i] == freq) {
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frequencies[i] = 0;
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volumes[i] = 0;
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for (int j = i; (j < 7); j++) {
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frequencies[j] = frequencies[j+1];
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frequencies[j+1] = 0;
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volumes[j] = volumes[j+1];
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volumes[j+1] = 0;
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}
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break;
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}
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}
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voices--;
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if (voices < 0) {
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voices = 0;
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}
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if (voice_place >= voices) {
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voice_place = 0;
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}
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if (voices == 0) {
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frequency = 0;
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frequency_alt = 0;
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volume = 0;
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playing_note = false;
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}
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}
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}
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#ifdef VIBRATO_ENABLE
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float mod(float a, int b) {
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float r = fmod(a, b);
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return r < 0 ? r + b : r;
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}
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float vibrato(float average_freq) {
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#ifdef VIBRATO_STRENGTH_ENABLE
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float vibrated_freq = average_freq * pow(vibrato_lut[(int)vibrato_counter], vibrato_strength);
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#else
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float vibrated_freq = average_freq * vibrato_lut[(int)vibrato_counter];
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#endif
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vibrato_counter = mod((vibrato_counter + vibrato_rate * (1.0 + 440.0/average_freq)), VIBRATO_LUT_LENGTH);
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return vibrated_freq;
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}
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#endif
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void play_note(float freq, int vol) {
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dprintf("audio play note freq=%d vol=%d", (int)freq, vol);
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if (!audio_initialized) {
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audio_init();
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}
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if (audio_config.enable && voices < 8) {
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// Cancel notes if notes are playing
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if (playing_notes) {
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stop_all_notes();
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}
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playing_note = true;
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envelope_index = 0;
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if (freq > 0) {
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frequencies[voices] = freq;
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volumes[voices] = vol;
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voices++;
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}
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}
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}
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void play_notes(float (*np)[][2], uint16_t n_count, bool n_repeat) {
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if (!audio_initialized) {
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audio_init();
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}
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if (audio_config.enable) {
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// Cancel note if a note is playing
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if (playing_note) {
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stop_all_notes();
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}
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playing_notes = true;
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notes_pointer = np;
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notes_count = n_count;
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notes_repeat = n_repeat;
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place = 0;
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current_note = 0;
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note_frequency = (*notes_pointer)[current_note][0];
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note_length = ((*notes_pointer)[current_note][1] / 4) * (((float)note_tempo) / 100);
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note_position = 0;
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}
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}
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bool is_playing_notes(void) {
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return playing_notes;
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}
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bool is_audio_on(void) {
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return (audio_config.enable != 0);
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}
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void audio_toggle(void) {
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audio_config.enable ^= 1;
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eeconfig_update_audio(audio_config.raw);
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if (audio_config.enable) {
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audio_on_user();
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}
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}
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void audio_on(void) {
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audio_config.enable = 1;
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eeconfig_update_audio(audio_config.raw);
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audio_on_user();
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}
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void audio_off(void) {
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stop_all_notes();
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audio_config.enable = 0;
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eeconfig_update_audio(audio_config.raw);
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}
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#ifdef VIBRATO_ENABLE
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// Vibrato rate functions
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void set_vibrato_rate(float rate) {
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vibrato_rate = rate;
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}
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void increase_vibrato_rate(float change) {
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vibrato_rate *= change;
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}
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void decrease_vibrato_rate(float change) {
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vibrato_rate /= change;
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}
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#ifdef VIBRATO_STRENGTH_ENABLE
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void set_vibrato_strength(float strength) {
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vibrato_strength = strength;
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}
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void increase_vibrato_strength(float change) {
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vibrato_strength *= change;
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}
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void decrease_vibrato_strength(float change) {
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vibrato_strength /= change;
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}
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#endif /* VIBRATO_STRENGTH_ENABLE */
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#endif /* VIBRATO_ENABLE */
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// Polyphony functions
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void set_polyphony_rate(float rate) {
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polyphony_rate = rate;
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}
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void enable_polyphony() {
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polyphony_rate = 5;
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}
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void disable_polyphony() {
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polyphony_rate = 0;
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}
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void increase_polyphony_rate(float change) {
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polyphony_rate *= change;
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}
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void decrease_polyphony_rate(float change) {
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polyphony_rate /= change;
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}
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// Timbre function
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void set_timbre(float timbre) {
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note_timbre = timbre;
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}
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// Tempo functions
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void set_tempo(uint8_t tempo) {
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note_tempo = tempo;
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}
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void decrease_tempo(uint8_t tempo_change) {
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note_tempo += tempo_change;
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}
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void increase_tempo(uint8_t tempo_change) {
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if (note_tempo - tempo_change < 10) {
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note_tempo = 10;
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} else {
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note_tempo -= tempo_change;
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}
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}
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