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586 lines
15 KiB
586 lines
15 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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/**
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* Size of the dac_buffer arrays. All must be the same size.
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*/
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#define DAC_BUFFER_SIZE 256U
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/**
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* Highest value allowed by our 12bit DAC.
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*/
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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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/**
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* Effective bitrate of the DAC. 44.1khz is the standard for most audio - any
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* lower will sacrifice perceptible audio quality. Any higher will limit the
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* number of simultaneous voices. In most situations, a tenth (1/10) of the
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* sample rate is where notes become unbearable.
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*/
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#ifndef DAC_SAMPLE_RATE
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#define DAC_SAMPLE_RATE 44100U
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#endif
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/**
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* The number of voices (in polyphony) that are supported. If too high a value
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* is used here, the keyboard will freeze and glitch-out when that many voices
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* are being played.
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*/
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#ifndef DAC_VOICES_MAX
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#define DAC_VOICES_MAX 2
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#endif
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/**
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* The default value of the DAC when not playing anything. Certain hardware
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* setups may require a high (DAC_SAMPLE_MAX) or low (0) value here.
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*/
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#ifndef DAC_OFF_VALUE
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#define DAC_OFF_VALUE DAC_SAMPLE_MAX / 2
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#endif
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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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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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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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uint32_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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static const dacsample_t dac_buffer[DAC_BUFFER_SIZE] = {
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// 256 values, max 4095
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0x800,0x832,0x864,0x896,0x8c8,0x8fa,0x92c,0x95e,
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0x98f,0x9c0,0x9f1,0xa22,0xa52,0xa82,0xab1,0xae0,
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0xb0f,0xb3d,0xb6b,0xb98,0xbc5,0xbf1,0xc1c,0xc47,
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0xc71,0xc9a,0xcc3,0xceb,0xd12,0xd39,0xd5f,0xd83,
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0xda7,0xdca,0xded,0xe0e,0xe2e,0xe4e,0xe6c,0xe8a,
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0xea6,0xec1,0xedc,0xef5,0xf0d,0xf24,0xf3a,0xf4f,
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0xf63,0xf76,0xf87,0xf98,0xfa7,0xfb5,0xfc2,0xfcd,
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0xfd8,0xfe1,0xfe9,0xff0,0xff5,0xff9,0xffd,0xffe,
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0xfff,0xffe,0xffd,0xff9,0xff5,0xff0,0xfe9,0xfe1,
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0xfd8,0xfcd,0xfc2,0xfb5,0xfa7,0xf98,0xf87,0xf76,
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0xf63,0xf4f,0xf3a,0xf24,0xf0d,0xef5,0xedc,0xec1,
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0xea6,0xe8a,0xe6c,0xe4e,0xe2e,0xe0e,0xded,0xdca,
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0xda7,0xd83,0xd5f,0xd39,0xd12,0xceb,0xcc3,0xc9a,
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0xc71,0xc47,0xc1c,0xbf1,0xbc5,0xb98,0xb6b,0xb3d,
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0xb0f,0xae0,0xab1,0xa82,0xa52,0xa22,0x9f1,0x9c0,
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0x98f,0x95e,0x92c,0x8fa,0x8c8,0x896,0x864,0x832,
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0x800,0x7cd,0x79b,0x769,0x737,0x705,0x6d3,0x6a1,
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0x670,0x63f,0x60e,0x5dd,0x5ad,0x57d,0x54e,0x51f,
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0x4f0,0x4c2,0x494,0x467,0x43a,0x40e,0x3e3,0x3b8,
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0x38e,0x365,0x33c,0x314,0x2ed,0x2c6,0x2a0,0x27c,
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0x258,0x235,0x212,0x1f1,0x1d1,0x1b1,0x193,0x175,
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0x159,0x13e,0x123,0x10a,0xf2, 0xdb, 0xc5, 0xb0,
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0x9c, 0x89, 0x78, 0x67, 0x58, 0x4a, 0x3d, 0x32,
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0x27, 0x1e, 0x16, 0xf, 0xa, 0x6, 0x2, 0x1,
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0x0, 0x1, 0x2, 0x6, 0xa, 0xf, 0x16, 0x1e,
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0x27, 0x32, 0x3d, 0x4a, 0x58, 0x67, 0x78, 0x89,
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0x9c, 0xb0, 0xc5, 0xdb, 0xf2, 0x10a,0x123,0x13e,
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0x159,0x175,0x193,0x1b1,0x1d1,0x1f1,0x212,0x235,
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0x258,0x27c,0x2a0,0x2c6,0x2ed,0x314,0x33c,0x365,
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0x38e,0x3b8,0x3e3,0x40e,0x43a,0x467,0x494,0x4c2,
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0x4f0,0x51f,0x54e,0x57d,0x5ad,0x5dd,0x60e,0x63f,
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0x670,0x6a1,0x6d3,0x705,0x737,0x769,0x79b,0x7cd
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};
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static const dacsample_t dac_buffer_triangle[DAC_BUFFER_SIZE] = {
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// 256 values, max 4095
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0x20, 0x40, 0x60, 0x80, 0xa0, 0xc0, 0xe0, 0x100,
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0x120,0x140,0x160,0x180,0x1a0,0x1c0,0x1e0,0x200,
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0x220,0x240,0x260,0x280,0x2a0,0x2c0,0x2e0,0x300,
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0x320,0x340,0x360,0x380,0x3a0,0x3c0,0x3e0,0x400,
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0x420,0x440,0x460,0x480,0x4a0,0x4c0,0x4e0,0x500,
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0x520,0x540,0x560,0x580,0x5a0,0x5c0,0x5e0,0x600,
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0x620,0x640,0x660,0x680,0x6a0,0x6c0,0x6e0,0x700,
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0x720,0x740,0x760,0x780,0x7a0,0x7c0,0x7e0,0x800,
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0x81f,0x83f,0x85f,0x87f,0x89f,0x8bf,0x8df,0x8ff,
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0x91f,0x93f,0x95f,0x97f,0x99f,0x9bf,0x9df,0x9ff,
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0xa1f,0xa3f,0xa5f,0xa7f,0xa9f,0xabf,0xadf,0xaff,
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0xb1f,0xb3f,0xb5f,0xb7f,0xb9f,0xbbf,0xbdf,0xbff,
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0xc1f,0xc3f,0xc5f,0xc7f,0xc9f,0xcbf,0xcdf,0xcff,
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0xd1f,0xd3f,0xd5f,0xd7f,0xd9f,0xdbf,0xddf,0xdff,
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0xe1f,0xe3f,0xe5f,0xe7f,0xe9f,0xebf,0xedf,0xeff,
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0xf1f,0xf3f,0xf5f,0xf7f,0xf9f,0xfbf,0xfdf,0xfff,
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0xfdf,0xfbf,0xf9f,0xf7f,0xf5f,0xf3f,0xf1f,0xeff,
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0xedf,0xebf,0xe9f,0xe7f,0xe5f,0xe3f,0xe1f,0xdff,
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0xddf,0xdbf,0xd9f,0xd7f,0xd5f,0xd3f,0xd1f,0xcff,
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0xcdf,0xcbf,0xc9f,0xc7f,0xc5f,0xc3f,0xc1f,0xbff,
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0xbdf,0xbbf,0xb9f,0xb7f,0xb5f,0xb3f,0xb1f,0xaff,
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0xadf,0xabf,0xa9f,0xa7f,0xa5f,0xa3f,0xa1f,0x9ff,
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0x9df,0x9bf,0x99f,0x97f,0x95f,0x93f,0x91f,0x8ff,
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0x8df,0x8bf,0x89f,0x87f,0x85f,0x83f,0x81f,0x800,
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0x7e0,0x7c0,0x7a0,0x780,0x760,0x740,0x720,0x700,
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0x6e0,0x6c0,0x6a0,0x680,0x660,0x640,0x620,0x600,
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0x5e0,0x5c0,0x5a0,0x580,0x560,0x540,0x520,0x500,
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0x4e0,0x4c0,0x4a0,0x480,0x460,0x440,0x420,0x400,
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0x3e0,0x3c0,0x3a0,0x380,0x360,0x340,0x320,0x300,
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0x2e0,0x2c0,0x2a0,0x280,0x260,0x240,0x220,0x200,
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0x1e0,0x1c0,0x1a0,0x180,0x160,0x140,0x120,0x100,
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0xe0, 0xc0, 0xa0, 0x80, 0x60, 0x40, 0x20, 0x0
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};
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static const dacsample_t dac_buffer_square[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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};
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static dacsample_t dac_buffer_empty[DAC_BUFFER_SIZE] = { DAC_OFF_VALUE };
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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. Does all of the main computing for sound synthesis.
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*/
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static void dac_end(DACDriver * dacp, dacsample_t * sample_p, size_t sample_count) {
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(void)dacp;
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(void)dac_buffer;
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// (void)dac_buffer_triangle;
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(void)dac_buffer_square;
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uint8_t working_voices = voices;
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if (working_voices > DAC_VOICES_MAX)
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working_voices = DAC_VOICES_MAX;
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for (uint8_t s = 0; s < sample_count; s++) {
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if (working_voices > 0) {
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uint16_t sample_sum = 0;
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for (uint8_t i = 0; i < working_voices; i++) {
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dac_if[i] = dac_if[i] + ((frequencies[i]*DAC_BUFFER_SIZE)/DAC_SAMPLE_RATE);
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// Needed because % doesn't work with floats
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// 0.5 less than the size because we use round() later
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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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uint16_t dac_i = (uint16_t)dac_if[i];
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// Wavetable generation/lookup
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// SINE
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sample_sum += dac_buffer[dac_i] / working_voices / 3;
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// TRIANGLE
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sample_sum += dac_buffer_triangle[dac_i] / working_voices / 3;
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// RISING TRIANGLE
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// sample_sum += (uint16_t)round((dac_if[i] * DAC_SAMPLE_MAX) / DAC_BUFFER_SIZE / working_voices );
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// SQUARE
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// sample_sum += ((dac_if[i] > (DAC_BUFFER_SIZE / 2)) ? DAC_SAMPLE_MAX / working_voices: 0);
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sample_sum += dac_buffer_square[dac_i] / working_voices / 3;
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}
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sample_p[s] = sample_sum;
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} else {
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sample_p[s] = DAC_OFF_VALUE;
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}
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}
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if (playing_notes) {
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note_position += sample_count;
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// End of the note - 35 is arbitary here, but gets us close to AVR's timing
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if ((note_position >= (note_length*DAC_SAMPLE_RATE/35))) {
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stop_note((*notes_pointer)[current_note][0]);
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current_note++;
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if (current_note >= notes_count) {
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if (notes_repeat) {
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current_note = 0;
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} else {
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playing_notes = false;
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return;
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}
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}
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play_note((*notes_pointer)[current_note][0], 15);
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envelope_index = 0;
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note_length = ((*notes_pointer)[current_note][1] / 4) * (((float)note_tempo) / 100);
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// Skip forward in the next note's length if we've over shot the last, so
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// the overall length of the song is the same
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note_position = note_position - (note_length*DAC_SAMPLE_RATE/35);
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}
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}
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}
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static void dac_error(DACDriver *dacp, dacerror_t err) {
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(void)dacp;
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(void)err;
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chSysHalt("DAC failure. halp");
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}
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static const GPTConfig gpt6cfg1 = {
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.frequency = DAC_SAMPLE_RATE * 3,
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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 DACConfig dac_conf = {
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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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/**
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* @note The DAC_TRG(0) here selects the Timer 6 TRGO event, which is triggered
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* on the rising edge after 3 APB1 clock cycles, causing our gpt6cfg1.frequency
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* to be a third of what we expect.
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*
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* Here are all the values for DAC_TRG (TSEL in the ref manual)
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* TIM15_TRGO 0b011
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* TIM2_TRGO 0b100
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* TIM3_TRGO 0b001
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* TIM6_TRGO 0b000
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* TIM7_TRGO 0b010
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* EXTI9 0b110
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* SWTRIG 0b111
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*/
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static const DACConversionGroup dac_conv_cfg = {
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.num_channels = 1U,
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.end_cb = dac_end,
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.error_cb = dac_error,
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.trigger = DAC_TRG(0b000)
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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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#if defined(A4_AUDIO)
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palSetPadMode(GPIOA, 4, PAL_MODE_INPUT_ANALOG );
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dacStart(&DACD1, &dac_conf);
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dacStartConversion(&DACD1, &dac_conv_cfg, dac_buffer_empty, DAC_BUFFER_SIZE);
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#endif
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#if defined(A5_AUDIO)
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palSetPadMode(GPIOA, 5, PAL_MODE_INPUT_ANALOG );
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dacStart(&DACD2, &dac_conf);
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dacStartConversion(&DACD2, &dac_conv_cfg, dac_buffer_empty, DAC_BUFFER_SIZE);
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#endif
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gptStart(&GPTD6, &gpt6cfg1);
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gptStartContinuous(&GPTD6, 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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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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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) {
|
|
voice_place = 0;
|
|
}
|
|
if (voices == 0) {
|
|
frequency = 0;
|
|
frequency_alt = 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;
|
|
|
|
if (freq > 0) {
|
|
envelope_index = 0;
|
|
frequencies[voices] = freq;
|
|
dac_if[voices] = 0.0f;
|
|
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) {
|
|
|
|
playing_notes = true;
|
|
|
|
notes_pointer = np;
|
|
notes_count = n_count;
|
|
notes_repeat = n_repeat;
|
|
|
|
current_note = 0;
|
|
|
|
note_length = ((*notes_pointer)[current_note][1] / 4) * (((float)note_tempo) / 100);
|
|
note_position = 0;
|
|
|
|
play_note((*notes_pointer)[current_note][0], 15);
|
|
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|