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MicroMDAEPiano
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Revert "first commit"

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This reverts commit 1ef901f460.
dev
Holger Wirtz 6 years ago
parent 1ef901f460
commit 19768a1cb6
17 changed files with 103721 additions and 196 deletions
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  1. 51
      EEPROMAnything.h
  2. 195
      LiquidMenuTest.ino
  3. 563
      MicroMDAEPiano.ino
  4. 0
      README.md
  5. 145
      UI.hpp
  6. 121
      config.h
  7. 50
      fast_log.h
  8. 58155
      hex/MicroMDAEPiano.ino_b3571dd93d.hex
  9. 370
      mdaEPiano.cpp
  10. 117
      mdaEPiano.h
  11. 21152
      mdaEPianoData.h
  12. 21154
      mdaEPianoDataXfade.h
  13. 1604
      midi_devices.hpp
  14. 120
      midinotes.h
  15. 11
      name.c
  16. 9
      utility/gen_xfade.sh
  17. 100
      utility/xfade_generator.c

51
EEPROMAnything.h
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/*
MicroMDAEPiano
MicroMDAEPiano is a port of the MDA-EPiano sound engine
(https://sourceforge.net/projects/mda-vst/) for the Teensy-3.5/3.6 with audio shield.
(c)2019 H. Wirtz <wirtz@parasitstudio.de>
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 3 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, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
// Idea from: https://playground.arduino.cc/Code/EEPROMWriteAnything/
#include <EEPROM.h>
#include <Arduino.h> // for type definitions
uint32_t crc32(uint8_t* calc_start, uint16_t calc_bytes);
template <class T> int EEPROM_writeAnything(int ee, const T& value)
{
uint8_t* p = (uint8_t*)(const void*)&value;
uint16_t i;
uint32_t checksum=crc32(p+4,sizeof(value)-4);
*p=checksum;
for (i = 0; i < sizeof(value); i++)
EEPROM.update(ee++, *p++);
return i;
}
template <class T> int EEPROM_readAnything(int ee, T& value)
{
uint8_t* p = (uint8_t*)(void*)&value;
unsigned int i;
for (i = 0; i < sizeof(value); i++)
*p++ = EEPROM.read(ee++);
return i;
}

195
LiquidMenuTest.ino
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/*
LiquidMenuTest
*/
#ifndef UI_HPP_INCLUDED
#define UI_HPP_INCLUDED
#include <LiquidCrystal_I2C.h>
#include <LiquidMenu.h>
#include <Bounce.h>
#include "Encoder4.h"
#include "config.h"
LiquidCrystal_I2C lcd(LCD_I2C_ADDRESS, LCD_CHARS, LCD_LINES);
Encoder4 enc[NUM_ENCODER] = {Encoder4(ENC_L_PIN_A, ENC_L_PIN_B), Encoder4(ENC_R_PIN_A, ENC_R_PIN_B)};
int32_t encoder_value[NUM_ENCODER];
Bounce but[NUM_ENCODER] = {Bounce(BUT_L_PIN, BUT_DEBOUNCE_MS), Bounce(BUT_R_PIN, BUT_DEBOUNCE_MS)};
uint8_t main_menu_selector = 0;
elapsedMillis control_rate;
enum { LEFT_ENCODER, RIGHT_ENCODER };
// Recycleable objects
const char text_back[] PROGMEM = "BACK";
LiquidLine back_line(1, 1, text_back);
// Main menu
const char text10[] PROGMEM = "Favorites";
const char text11[] PROGMEM = "Sound";
const char text12[] PROGMEM = "Store";
const char text13[] PROGMEM = "Info";
LiquidLine main_line1(1, 0, text10);
LiquidLine main_line2(1, 1, text11);
LiquidLine main_line3(1, 1, text12);
LiquidLine main_line4(1, 1, text13);
LiquidScreen main_screen;
LiquidMenu main_menu(lcd);
// Sound menu
const char text20[] PROGMEM = "Decay";
const char text21[] PROGMEM = "Release";
const char text22[] PROGMEM = "Hardness";
const char text23[] PROGMEM = "Treble";
LiquidLine sound_line1(1, 0, text20);
LiquidLine sound_line2(1, 1, text21);
LiquidLine sound_line3(1, 1, text22);
LiquidLine sound_line4(1, 1, text23);
LiquidScreen sound_screen(sound_line1, sound_line2, sound_line3, sound_line4);
LiquidMenu sound_menu(lcd, sound_screen);
// Info menu
const char text40[] PROGMEM = "INFO";
LiquidLine info_line1(0, 0, text40);
LiquidScreen info_screen(info_line1);
LiquidMenu info_menu(lcd, info_screen);
// System menu
LiquidSystem menu_system(main_menu, sound_menu, info_menu);
void callback_favorites_function() {
Serial.println(F("callback_favorites_function"));
}
void callback_sound_function() {
Serial.println(F("callback_sound_function"));
}
void callback_store_function() {
Serial.println(F("callback_store_function"));
}
void callback_info_function() {
Serial.println(F("callback_info_function"));
}
void callback_back_function() {
Serial.println(F("callback_back_function"));
}
void setup(void)
{
uint8_t i;
Serial.begin(38400);
pinMode(BUT_L_PIN, INPUT_PULLUP);
pinMode(BUT_R_PIN, INPUT_PULLUP);
Serial.println(F("<setup start>"));
// Encoder setup
enc[0].write(INITIAL_ENC_L_VALUE);
enc[1].write(INITIAL_ENC_R_VALUE);
// LCD display setup
lcd.init();
lcd.blink_off();
lcd.cursor_off();
lcd.backlight();
//lcd.noAutoscroll();
main_screen.add_line(main_line1);
main_screen.add_line(main_line2);
main_screen.add_line(main_line3);
main_screen.add_line(main_line4);
main_screen.add_line(back_line);
main_line1.attach_function(1, callback_favorites_function);
main_line2.attach_function(2, callback_sound_function);
main_line3.attach_function(3, callback_store_function);
main_line4.attach_function(4, callback_info_function);
back_line.attach_function(1, callback_back_function );
main_screen.set_displayLineCount(2);
main_menu.add_screen(main_screen);
for (i = 0; i < NUM_ENCODER; i++)
but[i].update();
enc[LEFT_ENCODER].write(0, 0, 99, true);
encoder_value[LEFT_ENCODER] = 0;
enc[RIGHT_ENCODER].write(0, 0, 4, true);
encoder_value[RIGHT_ENCODER] = 0;
menu_system.update();
menu_system.set_focusPosition(Position::LEFT);
menu_system.switch_focus();
}
void loop(void)
{
// CONTROL-RATE-EVENT-HANDLING
if (control_rate > CONTROL_RATE_MS)
{
control_rate = 0;
handle_ui();
}
}
void handle_ui(void)
{
uint8_t i;
int32_t encoder_tmp;
for (i = 0; i < NUM_ENCODER; i++)
{
but[i].update();
switch (i)
{
case RIGHT_ENCODER:
// Encoder handling
encoder_tmp = enc[RIGHT_ENCODER].read();
if (encoder_tmp > encoder_value[RIGHT_ENCODER])
{
// move down
#ifdef DEBUG
Serial.println(F("ENC-R-DOWN"));
#endif
menu_system.switch_focus(true);
if (encoder_value[RIGHT_ENCODER] == enc[RIGHT_ENCODER].read_max())
encoder_tmp = enc[RIGHT_ENCODER].read_min();
}
else if (encoder_tmp < encoder_value[RIGHT_ENCODER])
{
// move up
#ifdef DEBUG
Serial.println(F("ENC-R-UP"));
#endif
menu_system.switch_focus(false);
if (encoder_value[RIGHT_ENCODER] == enc[RIGHT_ENCODER].read_min())
encoder_tmp = enc[RIGHT_ENCODER].read_max();
}
encoder_value[RIGHT_ENCODER] = encoder_tmp;
enc[RIGHT_ENCODER].write(encoder_value[RIGHT_ENCODER]);
/*
// button handling
if (but[i].fallingEdge()) // SELECT
{
#ifdef DEBUG
Serial.println(F("SELECT-R"));
#endif
menu_system.change_menu(sound_menu);
}*/
break;
case LEFT_ENCODER:
// Encoder handling
// button handling
break;
}
}
}
#endif

563
MicroMDAEPiano.ino
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/*
MicroMDAEPiano
MicroMDAEPiano is a port of the MDA-EPiano sound engine
(https://sourceforge.net/projects/mda-vst/) for the Teensy-3.5/3.6 with audio shield.
(c)2019 H. Wirtz <wirtz@parasitstudio.de>
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 3 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, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <MIDI.h>
#include <EEPROM.h>
#include "EEPROMAnything.h"
#include <limits.h>
#include "mdaEPiano.h"
#ifdef USE_XFADE_DATA
#include "mdaEPianoDataXfade.h"
#else
#include "mdaEPianoData.h"
#endif
#include <Bounce.h>
#include "Encoder4.h"
#include <LiquidCrystal_I2C.h>
#include <LiquidMenu.h>
#include "UI.hpp"
#include "midi_devices.hpp"
//*************************************************************************************************
//* GLOBAL VARIABLES
//*************************************************************************************************
// Audio configuration
AudioPlayQueue queue_r;
AudioPlayQueue queue_l;
AudioAnalyzePeak peak_r;
AudioAnalyzePeak peak_l;
AudioEffectFreeverb freeverb_r;
AudioEffectFreeverb freeverb_l;
AudioMixer4 mixer_r;
AudioMixer4 mixer_l;
AudioConnection patchCord0(queue_r, peak_r);
AudioConnection patchCord1(queue_l, peak_l);
AudioConnection patchCord4(queue_r, freeverb_r);
AudioConnection patchCord5(queue_l, freeverb_l);
AudioConnection patchCord6(queue_r, 0, mixer_r, 0);
AudioConnection patchCord7(queue_l, 0, mixer_l, 0);
AudioConnection patchCord8(freeverb_r, 0, mixer_r, 1);
AudioConnection patchCord9(freeverb_l, 0, mixer_l, 1);
#if defined(TEENSY_AUDIO_BOARD)
AudioOutputI2S i2s1;
AudioConnection patchCord110(mixer_r, 0, i2s1, 0);
AudioConnection patchCord111(mixer_l, 0, i2s1, 1);
AudioControlSGTL5000 sgtl5000_1;
#elif defined(TGA_AUDIO_BOARD)
AudioOutputI2S i2s1;
AudioAmplifier volume_r;
AudioAmplifier volume_l;
AudioConnection patchCord10(mixer_r, volume_r);
AudioConnection patchCord11(mixer_l, volume_l);
AudioConnection patchCord12(volume_r, 0, i2s1, 1);
AudioConnection patchCord13(volume_l, 0, i2s1, 0);
AudioControlWM8731master wm8731_1;
#else
AudioOutputPT8211 pt8211_1;
AudioAmplifier volume_r;
AudioAmplifier volume_l;
AudioConnection patchCord10(mixer_r, volume_r);
AudioConnection patchCord11(mixer_l, volume_l);
AudioConnection patchCord12(volume_r, 0, pt8211_1, 1);
AudioConnection patchCord13(volume_l, 0, pt8211_1, 0);
#endif
// Objects
mdaEPiano* ep;
LiquidCrystal_I2C lcd(LCD_I2C_ADDRESS, LCD_CHARS, LCD_LINES);
Encoder4 enc[2] = {Encoder4(ENC_L_PIN_A, ENC_L_PIN_B), Encoder4(ENC_R_PIN_A, ENC_R_PIN_B)};
Bounce but[2] = {Bounce(BUT_L_PIN, BUT_DEBOUNCE_MS), Bounce(BUT_R_PIN, BUT_DEBOUNCE_MS)};
// Variables
uint8_t midi_channel = DEFAULT_MIDI_CHANNEL;
uint32_t xrun = 0;
uint32_t overload = 0;
uint32_t peak = 0;
uint16_t render_time_max = 0;
elapsedMicros fill_audio_buffer;
elapsedMillis control_rate;
elapsedMillis autostore;
const uint16_t audio_block_time_us = 1000000 / (SAMPLE_RATE / AUDIO_BLOCK_SAMPLES);
config_t configuration = {0xffff, 0, VOLUME, 0.5f, DEFAULT_MIDI_CHANNEL};
bool eeprom_update_flag = false;
#ifdef SHOW_CPU_LOAD_MSEC
elapsedMillis cpu_mem_millis;
#endif
enum MDA_EP_PARAM { DECAY, RELEASE, HARDNESS, TREBLE, PAN_TREM, LFO_RATE, VELOCITY_SENSE, STEREO, MAX_POLY, TUNE, DETUNE, OVERDRIVE };
//*************************************************************************************************
//* SETUP FUNCTION
//*************************************************************************************************
void setup()
{
//while (!Serial) ; // wait for Arduino Serial Monitor
pinMode(BUT_L_PIN, INPUT_PULLUP);
pinMode(BUT_R_PIN, INPUT_PULLUP);
menu_init();
lcd.clear();
lcd.setCursor(1, 0);
lcd.print(F("MicroMDAEpiano"));
lcd.setCursor(0, 1);
lcd.print(F("(c)parasiTstudio"));
Serial.begin(SERIAL_SPEED);
delay(500);
// Encoder setup
enc[0].write(INITIAL_ENC_L_VALUE);
enc[1].write(INITIAL_ENC_R_VALUE);
// Debug output
Serial.println(F("MicroMDAEPiano based on https://sourceforge.net/projects/mda-vst"));
Serial.println(F("(c)2018/2019 H. Wirtz <wirtz@parasitstudio.de>"));
Serial.println(F("https://codeberg.org/dcoredump/MicroMDAEPiano"));
Serial.print(F("Data in PROGMEM: "));
Serial.print(sizeof(epianoDataXfade), DEC);
Serial.println(F(" bytes"));
Serial.println();
Serial.println(F("<setup start>"));
// create EPiano object
ep = new mdaEPiano();
// read initial EEPROM variables
initial_values_from_eeprom();
setup_midi_devices();
// start audio card
AudioNoInterrupts();
AudioMemory(AUDIO_MEM);
#ifdef TEENSY_AUDIO_BOARD
sgtl5000_1.enable();
sgtl5000_1.dacVolumeRamp();
sgtl5000_1.dacVolume(1.0);
//sgtl5000_1.dacVolumeRampLinear();
sgtl5000_1.unmuteHeadphone();
sgtl5000_1.unmuteLineout();
sgtl5000_1.autoVolumeDisable(); // turn off AGC
sgtl5000_1.unmuteHeadphone();
sgtl5000_1.volume(0.5, 0.5); // Headphone volume
sgtl5000_1.lineOutLevel(SGTL5000_LINEOUT_LEVEL);
sgtl5000_1.audioPostProcessorEnable();
sgtl5000_1.autoVolumeControl(1, 1, 1, 0.9, 0.01, 0.05);
sgtl5000_1.autoVolumeEnable();
sgtl5000_1.surroundSoundEnable();
sgtl5000_1.surroundSound(7, 3); // Configures virtual surround width from 0 (mono) to 7 (widest). select may be set to 1 (disable), 2 (mono input) or 3 (stereo input).
sgtl5000_1.enhanceBassEnable();
sgtl5000_1.enhanceBass(1.0, 0.2, 1, 2); // Configures the bass enhancement by setting the levels of the original stereo signal and the bass-enhanced mono level which will be mixed together. The high-pass filter may be enabled (0) or bypassed (1).
/* The cutoff frequency is specified as follows:
value frequency
0 80Hz
1 100Hz
2 125Hz
3 150Hz
4 175Hz
5 200Hz
6 225Hz
*/
//sgtl5000_1.eqBands(bass, mid_bass, midrange, mid_treble, treble);
Serial.println(F("Teensy-Audio-Board enabled."));
#elif defined(TGA_AUDIO_BOARD)
wm8731_1.enable();
wm8731_1.volume(1.0);
Serial.println(F("TGA board enabled."));
#else
Serial.println(F("PT8211 enabled."));
#endif
//set_volume(vol, vol_left, vol_right);
set_volume(1.0, 0.5);
#if defined (DEBUG) && defined (SHOW_CPU_LOAD_MSEC)
// Initialize processor and memory measurements
AudioProcessorUsageMaxReset();
AudioMemoryUsageMaxReset();
#endif
Serial.print(F("AUDIO_BLOCK_SAMPLES="));
Serial.print(AUDIO_BLOCK_SAMPLES);
Serial.print(F(" (Time per block="));
Serial.print(audio_block_time_us);
Serial.println(F("ms)"));
ep->setParameter(DECAY, 0.5);
ep->setParameter(RELEASE, 0.5);
ep->setParameter(HARDNESS, 0.7);
ep->setParameter(TREBLE, 0.85);
ep->setParameter(DETUNE, 0.1);
ep->setParameter(VELOCITY_SENSE, 1.0);
ep->setParameter(STEREO, 0.7);
ep->setParameter(OVERDRIVE, 0.3);
freeverb_r.roomsize(0.2);
freeverb_l.roomsize(0.2);
freeverb_r.damping(0.5);
freeverb_l.damping(0.5);
mixer_r.gain(0, 0.7);
mixer_l.gain(0, 0.7);
mixer_r.gain(1, 0.3);
mixer_l.gain(1, 0.3);
AudioInterrupts();
Serial.println(F("<setup end>"));
menu_system.update();
menu_system.switch_focus();
#if defined (DEBUG) && defined (SHOW_CPU_LOAD_MSEC)
show_cpu_and_mem_usage();
cpu_mem_millis = 0;
#endif
}
//*************************************************************************************************
//* MAIN LOOP
//*************************************************************************************************
void loop()
{
int16_t* audio_buffer_r; // pointer to AUDIO_BLOCK_SAMPLES * sizeof(int16_t)
int16_t* audio_buffer_l; // pointer to AUDIO_BLOCK_SAMPLES * sizeof(int16_t)
// Main sound calculation
if (queue_r.available() && queue_l.available() && fill_audio_buffer > audio_block_time_us - 10)
{
fill_audio_buffer = 0;
#if defined (DEBUG) && defined (SHOW_CPU_LOAD_MSEC)
if (cpu_mem_millis > SHOW_CPU_LOAD_MSEC)
{
show_cpu_and_mem_usage();
cpu_mem_millis = 0;
}
#endif
audio_buffer_r = queue_r.getBuffer();
if (audio_buffer_r == NULL)
{
Serial.println(F("E: audio_buffer_r allocation problems!"));
}
audio_buffer_l = queue_l.getBuffer();
if (audio_buffer_l == NULL)
{
Serial.println(F("E: audio_buffer_l allocation problems!"));
}
elapsedMicros t1;
ep->process(audio_buffer_l, audio_buffer_r);
uint32_t t2 = t1;
if (t2 > audio_block_time_us) // everything greater 2.9ms is a buffer underrun!
xrun++;
if (t2 > render_time_max)
render_time_max = t2;
if (peak_r.available())
{
if (peak_r.read() > 1.00)
peak++;
}
if (peak_l.available())
{
if (peak_l.read() > 1.00)
peak++;
}
queue_r.playBuffer();
queue_l.playBuffer();
}
check_midi_devices();
// CONTROL-RATE-EVENT-HANDLING
if (control_rate > CONTROL_RATE_MS)
{
control_rate = 0;
handle_ui();
}
}
//*************************************************************************************************
//* PROGRAM FUNCTIONS
//*************************************************************************************************
void handleNoteOn(byte inChannel, byte inNumber, byte inVelocity)
{
if (checkMidiChannel(inChannel))
{
ep->noteOn(inNumber, inVelocity);
}
}
void handleNoteOff(byte inChannel, byte inNumber, byte inVelocity)
{
if (checkMidiChannel(inChannel))
{
ep->noteOn(inNumber, 0);
}
}
void handleControlChange(byte inChannel, byte inData1, byte inData2)
{
if (checkMidiChannel(inChannel))
{
ep->processMidiController(inData1, inData2);
}
}
void handleAfterTouch(byte inChannel, byte inPressure)
{
;
}
void handlePitchBend(byte inChannel, int inPitch)
{
;
}
void handleProgramChange(byte inChannel, byte inProgram)
{
;
}
void handleSystemExclusive(byte *data, uint len)
{
;
}
void handleSystemExclusiveChunk(const byte *data, uint16_t len, bool last)
{
;
}
void handleTimeCodeQuarterFrame(byte data)
{
;
}
void handleAfterTouchPoly(byte inChannel, byte inNumber, byte inVelocity)
{
;
}
void handleSongSelect(byte inSong)
{
;
}
void handleTuneRequest(void)
{
;
}
void handleClock(void)
{
;
}
void handleStart(void)
{
;
}
void handleContinue(void)
{
;
}
void handleStop(void)
{
;
}
void handleActiveSensing(void)
{
;
}
void handleSystemReset(void)
{
;
}
void handleRealTimeSystem(void)
{
;
}
bool checkMidiChannel(byte inChannel)
{
// check for MIDI channel
if (midi_channel == MIDI_CHANNEL_OMNI)
{
return (true);
}
else if (inChannel != midi_channel)
{
#ifdef DEBUG
Serial.print(F("Ignoring MIDI data on channel "));
Serial.print(inChannel);
Serial.print(F("(listening on "));
Serial.print(midi_channel);
Serial.println(F(")"));
#endif
return (false);
}
return (true);
}
void set_volume(float v, float p)
{
configuration.vol = v;
configuration.pan = p;
#ifdef DEBUG
Serial.print(F("Setting volume: VOL="));
Serial.print(v, DEC);
Serial.print(F("["));
Serial.print(configuration.vol, DEC);
Serial.print(F("] PAN="));
Serial.print(F("["));
Serial.print(configuration.pan, DEC);
Serial.print(F("] "));
Serial.print(pow(configuration.vol * sinf(configuration.pan * PI / 2), VOLUME_CURVE), 3);
Serial.print(F("/"));
Serial.println(pow(configuration.vol * cosf( configuration.pan * PI / 2), VOLUME_CURVE), 3);
#endif
// http://files.csound-tutorial.net/floss_manual/Release03/Cs_FM_03_ScrapBook/b-panning-and-spatialization.html
mixer_r.gain(0, sinf(p * PI / 2));
mixer_l.gain(0, cosf(p * PI / 2));
}
/******************************************************************************
EEPROM HELPER
******************************************************************************/
void initial_values_from_eeprom(void)
{
uint32_t checksum;
config_t tmp_conf;
EEPROM_readAnything(EEPROM_START_ADDRESS, tmp_conf);
checksum = crc32((byte*)&tmp_conf + 4, sizeof(tmp_conf) - 4);
#ifdef DEBUG
Serial.print(F("EEPROM checksum: 0x"));
Serial.print(tmp_conf.checksum, HEX);
Serial.print(F(" / 0x"));
Serial.print(checksum, HEX);
#endif
if (checksum != tmp_conf.checksum)
{
#ifdef DEBUG
Serial.print(F(" - mismatch -> initializing EEPROM!"));
#endif
eeprom_update();
}
else
{
EEPROM_readAnything(EEPROM_START_ADDRESS, configuration);
Serial.print(F(" - OK, loading!"));
}
#ifdef DEBUG
Serial.println();
#endif
}
void eeprom_write(void)
{
autostore = 0;
eeprom_update_flag = true;
}
void eeprom_update(void)
{
eeprom_update_flag = false;
configuration.checksum = crc32((byte*)&configuration + 4, sizeof(configuration) - 4);
EEPROM_writeAnything(EEPROM_START_ADDRESS, configuration);
Serial.println(F("Updating EEPROM with configuration data"));
}
uint32_t crc32(byte * calc_start, uint16_t calc_bytes) // base code from https://www.arduino.cc/en/Tutorial/EEPROMCrc
{
const uint32_t crc_table[16] =
{
0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
};
uint32_t crc = ~0L;
for (byte* index = calc_start ; index < (calc_start + calc_bytes) ; ++index)
{
crc = crc_table[(crc ^ *index) & 0x0f] ^ (crc >> 4);
crc = crc_table[(crc ^ (*index >> 4)) & 0x0f] ^ (crc >> 4);
crc = ~crc;
}
return (crc);
}
//*************************************************************************************************
//* DEBUG FUNCTIONS
//*************************************************************************************************
#if defined (DEBUG) && defined (SHOW_CPU_LOAD_MSEC)
void show_cpu_and_mem_usage(void)
{
Serial.print(F("CPU: "));
Serial.print(AudioProcessorUsage(), DEC);
Serial.print(F(" CPU MAX: "));
Serial.print(AudioProcessorUsageMax(), DEC);
Serial.print(F(" MEM: "));
Serial.print(AudioMemoryUsage(), DEC);
Serial.print(F(" MEM MAX: "));
Serial.print(AudioMemoryUsageMax(), DEC);
Serial.print(F(" RENDER_TIME_MAX: "));
Serial.print(render_time_max, DEC);
Serial.print(F(" XRUN: "));
Serial.print(xrun, DEC);
Serial.print(F(" OVERLOAD: "));
Serial.print(overload, DEC);
Serial.print(F(" PEAK: "));
Serial.print(peak, DEC);
Serial.println();
AudioProcessorUsageMaxReset();
AudioMemoryUsageMaxReset();
render_time_max = 0;
}
#endif

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README.md
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UI.hpp
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/*
MicroMDAEPiano
MicroMDAEPiano is a port of the MDA-EPiano sound engine
(https://sourceforge.net/projects/mda-vst/) for the Teensy-3.5/3.6 with audio shield.
(c)2019 H. Wirtz <wirtz@parasitstudio.de>
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 3 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, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef UI_HPP_INCLUDED
#define UI_HPP_INCLUDED
#include <LiquidCrystal_I2C.h>
#include <LiquidMenu.h>
#include <Bounce.h>
#include "Encoder4.h"
extern LiquidCrystal_I2C lcd;
extern Encoder4 enc[2];
extern Bounce but[2];
// Global vars
uint8_t main_menu_selector = 0;
enum { BUT_L, BUT_R };
// Main menu
const char text10[] PROGMEM = "Favorites ";
const char text11[] PROGMEM = "Sound ";
const char text12[] PROGMEM = "Store ";
const char text13[] PROGMEM = "Info ";
LiquidLine main_line1(0, 0, text10);
LiquidLine main_line2(0, 1, text11);
LiquidLine main_line3(0, 1, text12);
LiquidLine main_line4(0, 1, text13);
LiquidScreen main_screen;
LiquidMenu main_menu(lcd);
// Sound menu
const char text20[] PROGMEM = "Decay ";
const char text21[] PROGMEM = "Release ";
const char text22[] PROGMEM = "Hardness ";
const char text23[] PROGMEM = "Treble ";
LiquidLine sound_line1(0, 0, text20);
LiquidLine sound_line2(0, 1, text21);
LiquidLine sound_line3(0, 1, text22);
LiquidLine sound_line4(0, 1, text23);
LiquidScreen sound_screen(sound_line1, sound_line2, sound_line3, sound_line4);
LiquidMenu sound_menu(lcd, sound_screen);
// Info menu
const char text40[] PROGMEM = "INFO ";
LiquidLine info_line1(0, 0, text40);
LiquidScreen info_screen(info_line1);
LiquidMenu info_menu(lcd, info_screen);
// System menu
LiquidSystem menu_system(main_menu, sound_menu, info_menu);
void callback_favorites_function() {
Serial.println(F("callback_favorites_function"));
}
void callback_sound_function() {
Serial.println(F("callback_sound_function"));
}
void callback_store_function() {
Serial.println(F("callback_store_function"));
}
void callback_info_function() {
Serial.println(F("callback_info_function"));
}
void menu_init(void)
{
uint8_t i;
// LCD display setup
lcd.init();
lcd.blink_off();
lcd.cursor_off();
lcd.backlight();
//lcd.noAutoscroll();
main_screen.add_line(main_line1);
main_screen.add_line(main_line2);
main_screen.add_line(main_line3);
main_screen.add_line(main_line4);
main_line1.attach_function(1, callback_favorites_function);
main_line2.attach_function(2, callback_sound_function);
main_line3.attach_function(3, callback_store_function);
main_line4.attach_function(4, callback_info_function);
main_screen.set_displayLineCount(2);
main_menu.add_screen(main_screen);
menu_system.update();
for (i = 0; i < NUM_ENCODER; i++)
but[i].update();
enc[1].write(0, 0, 99);
enc[1].write(1, 0, 4);
}
void handle_ui(void)
{
uint8_t i;
for (i = 0; i < NUM_ENCODER; i++)
{
but[i].update();
switch (i)
{
case BUT_R: // SELECT
if (but[i].fallingEdge())
{
#ifdef DEBUG
Serial.println(F("SELECT-R"));
#endif
menu_system.next_screen();
}
break;
}
}
}
#endif

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config.h
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/*
MicroMDAEPiano
MicroMDAEPiano is a port of the MDA-EPiano sound engine
(https://sourceforge.net/projects/mda-vst/) for the Teensy-3.5/3.6 with audio shield.
(c)2019 H. Wirtz <wirtz@parasitstudio.de>
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 3 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, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef CONFIG_H_INCLUDED
#define CONFIG_H_INCLUDED
#include "midinotes.h"
#include <Arduino.h>
// ATTENTION! For better latency you have to redefine AUDIO_BLOCK_SAMPLES from
// 128 to 64 in <ARDUINO-IDE-DIR>/cores/teensy3/AudioStream.h
//*************************************************************************************************
//* DEVICE SETTINGS
//*************************************************************************************************
// MIDI
#define MIDI_DEVICE_DIN Serial1
#define MIDI_DEVICE_USB 1
#define MIDI_DEVICE_USB_HOST 1
// AUDIO
// If nothing is defined PT8211 is used as audio output device!
#define TEENSY_AUDIO_BOARD 1
//#define TGA_AUDIO_BOARD 1
//*************************************************************************************************
//* MIDI SETTINGS
//*************************************************************************************************
#define DEFAULT_MIDI_CHANNEL MIDI_CHANNEL_OMNI
#define MIDI_MERGE_THRU 1
//*************************************************************************************************
//* AUDIO SETTINGS
//*************************************************************************************************
#define VOLUME 0.8
#define VOLUME_CURVE 0.07
#define AUDIO_MEM 128
#define SAMPLE_RATE 44100
#define REDUCE_LOUDNESS 0
#define USE_XFADE_DATA 1
//*************************************************************************************************
//* DEBUG OUTPUT SETTINGS
//*************************************************************************************************
#define DEBUG 1
#define SERIAL_SPEED 38400
#define SHOW_XRUN 1
#define SHOW_CPU_LOAD_MSEC 5000
//*************************************************************************************************
//* HARDWARE SETTINGS
//*************************************************************************************************
// Teensy Audio Shield:
#define SGTL5000_LINEOUT_LEVEL 29
//#define SDCARD_CS_PIN 10
//#define SDCARD_MOSI_PIN 7
//#define SDCARD_SCK_PIN 14
// Teensy 3.5 & 3.6 SD card
#define SDCARD_CS_PIN BUILTIN_SDCARD
#define SDCARD_MOSI_PIN 11 // not actually used
#define SDCARD_SCK_PIN 13 // not actually used
// Encoder with button
#define NUM_ENCODER 2
#define ENC_L_PIN_A 3
@ -20,6 +104,41 @@
#define LCD_CHARS 16
#define LCD_LINES 2
#define CONTROL_RATE_MS 50
// EEPROM address
#define EEPROM_START_ADDRESS 0
//*************************************************************************************************
//* DO NO CHANGE ANYTHING BEYOND IF YOU DON'T KNOW WHAT YOU ARE DOING !!!
//*************************************************************************************************
#define CONTROL_RATE_MS 100
// MIDI
#ifdef MIDI_DEVICE_USB
#define USBCON 1
#endif
#if defined(__MK66FX1M0__)
// Teensy-3.6 settings
#define MIDI_DEVICE_USB_HOST 1
#else
// Teensy-3.5 settings
#undef MIDI_DEVICE_USB_HOST
#endif
// Engine
#if defined(__MK66FX1M0__)
// Teensy-3.6 settings
#define NVOICES 64
#else
#define NVOICES 32
#endif
// struct for holding the current configuration
struct config_t {
uint32_t checksum;
uint8_t voice;
float vol;
float pan;
uint8_t midi_channel;
};
#endif

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/* ----------------------------------------------------------------------
* https://community.arm.com/tools/f/discussions/4292/cmsis-dsp-new-functionality-proposal/22621#22621
* Fast approximation to the log2() function. It uses a two step
* process. First, it decomposes the floating-point number into
* a fractional component F and an exponent E. The fraction component
* is used in a polynomial approximation and then the exponent added
* to the result. A 3rd order polynomial is used and the result
* when computing db20() is accurate to 7.984884e-003 dB.
** ------------------------------------------------------------------- */
float log2f_approx_coeff[4] = {1.23149591368684f, -4.11852516267426f, 6.02197014179219f, -3.13396450166353f};
float log2f_approx(float X)
{
float *C = &log2f_approx_coeff[0];
float Y;
float F;
int E;
// This is the approximation to log2()
F = frexpf(fabsf(X), &E);
// Y = C[0]*F*F*F + C[1]*F*F + C[2]*F + C[3] + E;
Y = *C++;
Y *= F;
Y += (*C++);
Y *= F;
Y += (*C++);
Y *= F;
Y += (*C++);
Y += E;
return(Y);
}
// https://codingforspeed.com/using-faster-exponential-approximation/
inline float expf_approx(float x) {
x = 1.0f + x / 1024;
x *= x; x *= x; x *= x; x *= x;
x *= x; x *= x; x *= x; x *= x;
x *= x; x *= x;
return x;
}
inline float unitToDb(float unit) {
return 6.02f * log2f_approx(unit);
}
inline float dbToUnit(float db) {
return expf_approx(db * 2.302585092994046f * 0.05f);
}

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/*
MicroMDAEPiano
MicroMDAEPiano is a port of the MDA-EPiano sound engine
(https://sourceforge.net/projects/mda-vst/) for the Teensy-3.5/3.6 with audio shield.
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 3 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, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#ifdef USE_XFADE_DATA
#include "mdaEPianoDataXfade.h"
#else
#include "mdaEPianoData.h"
#endif
#include "mdaEPiano.h"
#include <stdio.h>
#include <math.h>
mdaEPiano::mdaEPiano() // mdaEPiano::mdaEPiano(audioMasterCallback audioMaster) : AudioEffectX(audioMaster, NPROGS, NPARAMS)
{
Fs = SAMPLE_RATE; iFs = 1.0f / Fs; //just in case...
programs = new mdaEPianoProgram[NPROGS];
if (programs)
{
//fill patches...
int32_t i = 0;
fillpatch(i++, "Default", 0.500f, 0.500f, 0.500f, 0.500f, 0.500f, 0.650f, 0.250f, 0.500f, 1.0f, 0.500f, 0.146f, 0.000f);
fillpatch(i++, "Bright", 0.500f, 0.500f, 1.000f, 0.800f, 0.500f, 0.650f, 0.250f, 0.500f, 1.0f, 0.500f, 0.146f, 0.500f);
fillpatch(i++, "Mellow", 0.500f, 0.500f, 0.000f, 0.000f, 0.500f, 0.650f, 0.250f, 0.500f, 1.0f, 0.500f, 0.246f, 0.000f);
fillpatch(i++, "Autopan", 0.500f, 0.500f, 0.500f, 0.500f, 0.250f, 0.650f, 0.250f, 0.500f, 1.0f, 0.500f, 0.246f, 0.000f);
fillpatch(i++, "Tremolo", 0.500f, 0.500f, 0.500f, 0.500f, 0.750f, 0.650f, 0.250f, 0.500f, 1.0f, 0.500f, 0.246f, 0.000f);
fillpatch(i++, "(default)", 0.500f, 0.500f, 0.500f, 0.500f, 0.500f, 0.650f, 0.250f, 0.500f, 1.0f, 0.500f, 0.146f, 0.000f);
fillpatch(i++, "(default)", 0.500f, 0.500f, 0.500f, 0.500f, 0.500f, 0.650f, 0.250f, 0.500f, 1.0f, 0.500f, 0.146f, 0.000f);
fillpatch(i++, "(default)", 0.500f, 0.500f, 0.500f, 0.500f, 0.500f, 0.650f, 0.250f, 0.500f, 1.0f, 0.500f, 0.146f, 0.000f);
setProgram(0);
}
waves = (short*)epianoDataXfade;
//Waveform data and keymapping
kgrp[ 0].root = 36; kgrp[ 0].high = 39; //C1
kgrp[ 3].root = 43; kgrp[ 3].high = 45; //G1
kgrp[ 6].root = 48; kgrp[ 6].high = 51; //C2
kgrp[ 9].root = 55; kgrp[ 9].high = 57; //G2
kgrp[12].root = 60; kgrp[12].high = 63; //C3
kgrp[15].root = 67; kgrp[15].high = 69; //G3
kgrp[18].root = 72; kgrp[18].high = 75; //C4
kgrp[21].root = 79; kgrp[21].high = 81; //G4
kgrp[24].root = 84; kgrp[24].high = 87; //C5
kgrp[27].root = 91; kgrp[27].high = 93; //G5
kgrp[30].root = 96; kgrp[30].high = 999; //C6
kgrp[0].pos = 0; kgrp[0].end = 8476; kgrp[0].loop = 4400;
kgrp[1].pos = 8477; kgrp[1].end = 16248; kgrp[1].loop = 4903;
kgrp[2].pos = 16249; kgrp[2].end = 34565; kgrp[2].loop = 6398;
kgrp[3].pos = 34566; kgrp[3].end = 41384; kgrp[3].loop = 3938;
kgrp[4].pos = 41385; kgrp[4].end = 45760; kgrp[4].loop = 1633; //was 1636;
kgrp[5].pos = 45761; kgrp[5].end = 65211; kgrp[5].loop = 5245;
kgrp[6].pos = 65212; kgrp[6].end = 72897; kgrp[6].loop = 2937;
kgrp[7].pos = 72898; kgrp[7].end = 78626; kgrp[7].loop = 2203; //was 2204;
kgrp[8].pos = 78627; kgrp[8].end = 100387; kgrp[8].loop = 6368;
kgrp[9].pos = 100388; kgrp[9].end = 116297; kgrp[9].loop = 10452;
kgrp[10].pos = 116298; kgrp[10].end = 127661; kgrp[10].loop = 5217; //was 5220;
kgrp[11].pos = 127662; kgrp[11].end = 144113; kgrp[11].loop = 3099;
kgrp[12].pos = 144114; kgrp[12].end = 152863; kgrp[12].loop = 4284;
kgrp[13].pos = 152864; kgrp[13].end = 173107; kgrp[13].loop = 3916;
kgrp[14].pos = 173108; kgrp[14].end = 192734; kgrp[14].loop = 2937;
kgrp[15].pos = 192735; kgrp[15].end = 204598; kgrp[15].loop = 4732;
kgrp[16].pos = 204599; kgrp[16].end = 218995; kgrp[16].loop = 4733;
kgrp[17].pos = 218996; kgrp[17].end = 233801; kgrp[17].loop = 2285;
kgrp[18].pos = 233802; kgrp[18].end = 248011; kgrp[18].loop = 4098;
kgrp[19].pos = 248012; kgrp[19].end = 265287; kgrp[19].loop = 4099;
kgrp[20].pos = 265288; kgrp[20].end = 282255; kgrp[20].loop = 3609;
kgrp[21].pos = 282256; kgrp[21].end = 293776; kgrp[21].loop = 2446;
kgrp[22].pos = 293777; kgrp[22].end = 312566; kgrp[22].loop = 6278;
kgrp[23].pos = 312567; kgrp[23].end = 330200; kgrp[23].loop = 2283;
kgrp[24].pos = 330201; kgrp[24].end = 348889; kgrp[24].loop = 2689;
kgrp[25].pos = 348890; kgrp[25].end = 365675; kgrp[25].loop = 4370;
kgrp[26].pos = 365676; kgrp[26].end = 383661; kgrp[26].loop = 5225;
kgrp[27].pos = 383662; kgrp[27].end = 393372; kgrp[27].loop = 2811;
kgrp[28].pos = 383662; kgrp[28].end = 393372; kgrp[28].loop = 2811; //ghost
kgrp[29].pos = 393373; kgrp[29].end = 406045; kgrp[29].loop = 4522;
kgrp[30].pos = 406046; kgrp[30].end = 414486; kgrp[30].loop = 2306;
kgrp[31].pos = 406046; kgrp[31].end = 414486; kgrp[31].loop = 2306; //ghost
kgrp[32].pos = 414487; kgrp[32].end = 422408; kgrp[32].loop = 2169;
//initialise...
for (int32_t v = 0; v < NVOICES; v++)
{
voice[v].env = 0.0f;
voice[v].dec = 0.99f; //all notes off
}
volume = 0.2f;
muff = 160.0f;
sustain = activevoices = 0;
tl = tr = lfo0 = dlfo = 0.0f;
lfo1 = 1.0f;
guiUpdate = 0;
vol = VOLUME;
update();
// suspend();
}
void mdaEPiano::update() //parameter change
{
float * param = programs[curProgram].param;
size = (int32_t)(12.0f * param[2] - 6.0f);
treb = 4.0f * param[3] * param[3] - 1.0f; //treble gain
if (param[3] > 0.5f) tfrq = 14000.0f; else tfrq = 5000.0f; //treble freq
tfrq = 1.0f - (float)exp(-iFs * tfrq);
rmod = lmod = param[4] + param[4] - 1.0f; //lfo depth
if (param[4] < 0.5f) rmod = -rmod;
dlfo = 6.283f * iFs * (float)exp(6.22f * param[5] - 2.61f); //lfo rate
velsens = 1.0f + param[6] + param[6];
if (param[6] < 0.25f) velsens -= 0.75f - 3.0f * param[6];
width = 0.03f * param[7];
fine = param[9] - 0.5f;
random = 0.077f * param[10] * param[10];
stretch = 0.0f; //0.000434f * (param[11] - 0.5f); parameter re-used for overdrive!
overdrive = 1.8f * param[11];
}
void mdaEPiano::resume()
{
Fs = SAMPLE_RATE;
iFs = 1.0f / Fs;
dlfo = 6.283f * iFs * (float)exp(6.22f * programs[curProgram].param[5] - 2.61f); //lfo rate
}
mdaEPiano::~mdaEPiano () //destroy any buffers...
{
if (programs) delete [] programs;
}
void mdaEPiano::setProgram(int32_t program)
{
curProgram = program;
update();
}
void mdaEPiano::setParameter(int32_t index, float value)
{
programs[curProgram].param[index] = value;
update();
}
void mdaEPiano::fillpatch(int32_t p, char *name, float p0, float p1, float p2, float p3, float p4,
float p5, float p6, float p7, float p8, float p9, float p10, float p11)
{
strcpy(programs[p].name, name);
programs[p].param[0] = p0; programs[p].param[1] = p1;
programs[p].param[2] = p2; programs[p].param[3] = p3;
programs[p].param[4] = p4; programs[p].param[5] = p5;
programs[p].param[6] = p6; programs[p].param[7] = p7;
programs[p].param[8] = p8; programs[p].param[9] = p9;
programs[p].param[10] = p10; programs[p].param[11] = p11;
}
float mdaEPiano::getParameter(int32_t index) {
return programs[curProgram].param[index];
}
void mdaEPiano::process(int16_t* outputs_r, int16_t* outputs_l)
{
int16_t v;
float x, l, r, od = overdrive;
int32_t i;
int16_t frame;
for (frame = 0; frame < AUDIO_BLOCK_SAMPLES; frame++)
{
VOICE *V = voice;
l = r = 0.0f;
for (v = 0; v < activevoices; v++)
{
V->frac += V->delta; //integer-based linear interpolation
V->pos += V->frac >> 16;
V->frac &= 0xFFFF;
if (V->pos > V->end)
V->pos -= V->loop;
i = waves[V->pos] + ((V->frac * (waves[V->pos + 1] - waves[V->pos])) >> 16);
x = V->env * static_cast<float>(i) / 32768.0f;
V->env = V->env * V->dec; //envelope
if (x > 0.0f)
{
x -= od * x * x; //overdrive
if (x < -V->env) x = -V->env;
}
l += V->outl * x;
r += V->outr * x;
V++;
}
tl += tfrq * (l - tl); //treble boost
tr += tfrq * (r - tr);
r += treb * (r - tr);
l += treb * (l - tl);
lfo0 += dlfo * lfo1; //LFO for tremolo and autopan
lfo1 -= dlfo * lfo0;
l += l * lmod * lfo1;
r += r * rmod * lfo1; //worth making all these local variables?
r *= 0.5;
l *= 0.5;
if (r > 1.0)
r = 1.0;
else if (r < -1.0)
r = -1.0;
if (l > 1.0)
l = 1.0;
else if (l < -1.0)
l = -1.0;
outputs_l[frame] = static_cast<int16_t>(l * configuration.vol * 0x7fff) >> REDUCE_LOUDNESS;
outputs_r[frame] = static_cast<int16_t>(r * configuration.vol * 0x7fff) >> REDUCE_LOUDNESS;
}
if (fabs(tl) < 1.0e-10) tl = 0.0f; //anti-denormal
if (fabs(tr) < 1.0e-10) tr = 0.0f;
for (v = 0; v < activevoices; v++)
if (voice[v].env < SILENCE)
voice[v] = voice[--activevoices];
}
void mdaEPiano::noteOn(int32_t note, int32_t velocity)
{
float * param = programs[curProgram].param;
float l = 99.0f;
int32_t v, vl = 0, k, s;
if (velocity > 0)
{
if (activevoices < NVOICES) //add a note
{
vl = activevoices;
activevoices++;
voice[vl].f0 = voice[vl].f1 = 0.0f;
}
else //steal a note
{
for (v = 0; v < NVOICES; v++) //find quietest voice
{
if (voice[v].env < l) {
l = voice[v].env;
vl = v;
}
}
}
k = (note - 60) * (note - 60);
l = fine + random * ((float)(k % 13) - 6.5f); //random & fine tune
if (note > 60) l += stretch * (float)k; //stretch
s = size;
//if(velocity > 40) s += (int32_t)(sizevel * (float)(velocity - 40)); - no velocity to hardness in ePiano
k = 0;
while (note > (kgrp[k].high + s)) k += 3; //find keygroup
l += (float)(note - kgrp[k].root); //pitch
l = 32000.0f * iFs * (float)exp(0.05776226505 * l);
voice[vl].delta = (int32_t)(65536.0f * l);
voice[vl].frac = 0;
if (velocity > 48) k++; //mid velocity sample
if (velocity > 80) k++; //high velocity sample
voice[vl].pos = kgrp[k].pos;
voice[vl].end = kgrp[k].end - 1;
voice[vl].loop = kgrp[k].loop;
voice[vl].env = (3.0f + 2.0f * velsens) * (float)pow(0.0078f * velocity, velsens); //velocity
if (note > 60) voice[vl].env *= (float)exp(0.01f * (float)(60 - note)); //new! high notes quieter
l = 50.0f + param[4] * param[4] * muff + muffvel * (float)(velocity - 64); //muffle
if (l < (55.0f + 0.4f * (float)note)) l = 55.0f + 0.4f * (float)note;
if (l > 210.0f) l = 210.0f;
voice[vl].ff = l * l * iFs;
voice[vl].note = note; //note->pan
if (note < 12) note = 12;
if (note > 108) note = 108;
l = volume;
voice[vl].outr = l + l * width * (float)(note - 60);
voice[vl].outl = l + l - voice[vl].outr;
if (note < 44) note = 44; //limit max decay length
voice[vl].dec = (float)exp(-iFs * exp(-1.0 + 0.03 * (double)note - 2.0f * param[0]));
}
else //note off
{
for (v = 0; v < NVOICES; v++) if (voice[v].note == note) //any voices playing that note?
{
if (sustain == 0)
{
voice[v].dec = (float)exp(-iFs * exp(6.0 + 0.01 * (double)note - 5.0 * param[1]));
}
else voice[v].note = SUSTAIN;
}
}
}
bool mdaEPiano::processMidiController(uint8_t data1, uint8_t data2)
{
float* param = programs[curProgram].param;
switch (data1)
{
case 0x01: //mod wheel
modwhl = 0.0078f * (float)(data2);
if (modwhl > 0.05f) //over-ride pan/trem depth
{
rmod = lmod = modwhl; //lfo depth
if (param[4] < 0.5f) rmod = -rmod;
}
break;
case 0x07: //volume
volume = 0.00002f * (float)(data2 * data2);
break;
case 0x40: //sustain pedal
case 0x42: //sustenuto pedal
sustain = data2 & 0x40;
if (sustain == 0)
{
noteOn(SUSTAIN, 0); //end all sustained notes
}
break;
default: //all notes off
if (data1 > 0x7A)
{
for (int32_t v = 0; v < NVOICES; v++) voice[v].dec = 0.99f;
sustain = 0;
muff = 160.0f;
}
break;
}
return (true);
}

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mdaEPiano.h
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/*
MicroMDAEPiano
MicroMDAEPiano is a port of the MDA-EPiano sound engine
(https://sourceforge.net/projects/mda-vst/) for the Teensy-3.5/3.6 with audio shield.
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 3 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, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __mdaEPiano__
#define __mdaEPiano__
#include <Audio.h>
#include <Arduino.h>
#include <string.h>
#include "config.h"
#define NPARAMS 12 //number of parameters
#define NPROGS 8 //number of programs
#define NOUTS 2 //number of outputs
#define SUSTAIN 128
#define SILENCE 0.0001f //voice choking
#define WAVELEN 422414 //wave data bytes
extern config_t configuration;
class mdaEPianoProgram
{
friend class mdaEPiano;
private:
float param[NPARAMS];
char name[24];
};
struct VOICE //voice state
{
int32_t delta; //sample playback
int32_t frac;
int32_t pos;
int32_t end;
int32_t loop;
float env; //envelope
float dec;
float f0; //first-order LPF
float f1;
float ff;
float outl;
float outr;
int32_t note; //remember what note triggered this
};
struct KGRP //keygroup
{
int32_t root; //MIDI root note
int32_t high; //highest note
int32_t pos;
int32_t end;
int32_t loop;
};
class mdaEPiano
{
public:
mdaEPiano();
~mdaEPiano();
virtual void process(int16_t *outputs_r, int16_t *outputs_l);
void noteOn(int32_t note, int32_t velocity);
virtual bool processMidiController(uint8_t data1, uint8_t data2);
virtual void setProgram(int32_t program);
virtual void setParameter(int32_t index, float value);
virtual float getParameter(int32_t index);
virtual void resume();
int32_t guiUpdate;
void guiGetDisplay(int32_t index, char *label);
private:
void update(); //my parameter update
void fillpatch(int32_t p, char *name, float p0, float p1, float p2, float p3, float p4,
float p5, float p6, float p7, float p8, float p9, float p10, float p11);
mdaEPianoProgram* programs;
float Fs, iFs;
///global internal variables
KGRP kgrp[34];
VOICE voice[NVOICES];
int32_t activevoices;
short *waves;
float width;
int32_t size, sustain;
float lfo0, lfo1, dlfo, lmod, rmod;
float treb, tfrq, tl, tr;
float tune, fine, random, stretch, overdrive;
float muff, muffvel, sizevel, velsens, volume, modwhl;
float vol;
uint8_t curProgram;
};
#endif

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mdaEPianoData.h
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21154
mdaEPianoDataXfade.h
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midi_devices.hpp
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120
midinotes.h
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/*
MicroMDAEPiano
MicroMDAEPiano is a port of the MDA-EPiano sound engine
(https://sourceforge.net/projects/mda-vst/) for the Teensy-3.5/3.6 with audio shield.
(c)2019 H. Wirtz <wirtz@parasitstudio.de>
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 3 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, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*************************************************
* MIDI note values
*************************************************/
#ifndef _MIDINOTES_H
#define _MIDINOTES_H
#define MIDI_A0 21
#define MIDI_AIS0 22
#define MIDI_B0 23
#define MIDI_C1 24
#define MIDI_CIS1 25
#define MIDI_D1 26
#define MIDI_DIS1 27
#define MIDI_E1 28
#define MIDI_F1 29
#define MIDI_FIS1 30
#define MIDI_G1 31
#define MIDI_GIS1 32
#define MIDI_A1 33
#define MIDI_AIS1 34
#define MIDI_B1 35
#define MIDI_C2 36
#define MIDI_CIS2 37
#define MIDI_D2 38
#define MIDI_DIS2 39
#define MIDI_E2 40
#define MIDI_F2 41
#define MIDI_FIS2 42
#define MIDI_G2 43
#define MIDI_GIS2 44
#define MIDI_A2 45
#define MIDI_AIS2 46
#define MIDI_B2 47
#define MIDI_C3 48
#define MIDI_CIS3 49
#define MIDI_D3 50
#define MIDI_DIS3 51
#define MIDI_E3 52
#define MIDI_F3 53
#define MIDI_FIS3 54
#define MIDI_G3 55
#define MIDI_GIS3 56
#define MIDI_A3 57
#define MIDI_AIS3 58
#define MIDI_B3 59
#define MIDI_C4 60
#define MIDI_CIS4 61
#define MIDI_D4 62
#define MIDI_DIS4 63
#define MIDI_E4 64
#define MIDI_F4 65
#define MIDI_FIS4 66
#define MIDI_G4 67
#define MIDI_GIS4 68
#define MIDI_A4 69
#define MIDI_AIS4 70
#define MIDI_B4 71
#define MIDI_C5 72
#define MIDI_CIS5 73
#define MIDI_D5 74
#define MIDI_DIS5 75
#define MIDI_E5 76
#define MIDI_F5 77
#define MIDI_FIS5 78
#define MIDI_G5 79
#define MIDI_GIS5 80
#define MIDI_A5 81
#define MIDI_AIS5 82
#define MIDI_B5 83
#define MIDI_C6 84
#define MIDI_CIS6 85
#define MIDI_D6 86
#define MIDI_DIS6 87
#define MIDI_E6 88
#define MIDI_F6 89
#define MIDI_FIS6 90
#define MIDI_G6 91
#define MIDI_GIS6 92
#define MIDI_A6 93
#define MIDI_AIS6 94
#define MIDI_B6 95
#define MIDI_C7 96
#define MIDI_CIS7 97
#define MIDI_D7 98
#define MIDI_DIS7 99
#define MIDI_E7 100
#define MIDI_F7 101
#define MIDI_FIS7 102
#define MIDI_G7 103
#define MIDI_GIS7 104
#define MIDI_A7 105
#define MIDI_AIS7 106
#define MIDI_B7 107
#define MIDI_C8 108
#endif

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name.c
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#include "usb_names.h"
#define MIDI_NAME {'M','i','c','r','o','M','D','A','E','p','i','a','n','o'}
#define MIDI_NAME_LEN 14
// Do not change this part. This exact format is required by USB.
struct usb_string_descriptor_struct usb_string_product_name = {
2 + MIDI_NAME_LEN * 2,
3,
MIDI_NAME
};

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utility/gen_xfade.sh
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#!/bin/bash
sed -e 's/^.\+Arduino\.h.\+$/#include <stdint.h>/' ../mdaEPianoData.h >mdaEPianoData.h
sed -i 's/PROGMEM//' mdaEPianoData.h
sed -i 's/const//' mdaEPianoData.h
gcc -o xfade_generator xfade_generator.c
rm mdaEPianoData.h
./xfade_generator >../mdaEPianoData_xfade.h
rm xfade_generator

100
utility/xfade_generator.c
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#include "mdaEPianoData.h"
#include <stdio.h>
#include <math.h>
#include <stdint.h>
struct KGRP //keygroup
{
int32_t root; //MIDI root note
int32_t high; //highest note
int32_t pos;
int32_t end;
int32_t loop;
};
void main(void)
{
struct KGRP kgrp[34];
int16_t *waves = (int16_t*)epianoData;
//Waveform data and keymapping
kgrp[ 0].root = 36; kgrp[ 0].high = 39; //C1
kgrp[ 3].root = 43; kgrp[ 3].high = 45; //G1
kgrp[ 6].root = 48; kgrp[ 6].high = 51; //C2
kgrp[ 9].root = 55; kgrp[ 9].high = 57; //G2
kgrp[12].root = 60; kgrp[12].high = 63; //C3
kgrp[15].root = 67; kgrp[15].high = 69; //G3
kgrp[18].root = 72; kgrp[18].high = 75; //C4
kgrp[21].root = 79; kgrp[21].high = 81; //G4
kgrp[24].root = 84; kgrp[24].high = 87; //C5
kgrp[27].root = 91; kgrp[27].high = 93; //G5
kgrp[30].root = 96; kgrp[30].high = 999; //C6
kgrp[0].pos = 0; kgrp[0].end = 8476; kgrp[0].loop = 4400;
kgrp[1].pos = 8477; kgrp[1].end = 16248; kgrp[1].loop = 4903;
kgrp[2].pos = 16249; kgrp[2].end = 34565; kgrp[2].loop = 6398;
kgrp[3].pos = 34566; kgrp[3].end = 41384; kgrp[3].loop = 3938;
kgrp[4].pos = 41385; kgrp[4].end = 45760; kgrp[4].loop = 1633; //was 1636;
kgrp[5].pos = 45761; kgrp[5].end = 65211; kgrp[5].loop = 5245;
kgrp[6].pos = 65212; kgrp[6].end = 72897; kgrp[6].loop = 2937;
kgrp[7].pos = 72898; kgrp[7].end = 78626; kgrp[7].loop = 2203; //was 2204;
kgrp[8].pos = 78627; kgrp[8].end = 100387; kgrp[8].loop = 6368;
kgrp[9].pos = 100388; kgrp[9].end = 116297; kgrp[9].loop = 10452;
kgrp[10].pos = 116298; kgrp[10].end = 127661; kgrp[10].loop = 5217; //was 5220;
kgrp[11].pos = 127662; kgrp[11].end = 144113; kgrp[11].loop = 3099;
kgrp[12].pos = 144114; kgrp[12].end = 152863; kgrp[12].loop = 4284;
kgrp[13].pos = 152864; kgrp[13].end = 173107; kgrp[13].loop = 3916;
kgrp[14].pos = 173108; kgrp[14].end = 192734; kgrp[14].loop = 2937;
kgrp[15].pos = 192735; kgrp[15].end = 204598; kgrp[15].loop = 4732;
kgrp[16].pos = 204599; kgrp[16].end = 218995; kgrp[16].loop = 4733;
kgrp[17].pos = 218996; kgrp[17].end = 233801; kgrp[17].loop = 2285;
kgrp[18].pos = 233802; kgrp[18].end = 248011; kgrp[18].loop = 4098;
kgrp[19].pos = 248012; kgrp[19].end = 265287; kgrp[19].loop = 4099;
kgrp[20].pos = 265288; kgrp[20].end = 282255; kgrp[20].loop = 3609;
kgrp[21].pos = 282256; kgrp[21].end = 293776; kgrp[21].loop = 2446;
kgrp[22].pos = 293777; kgrp[22].end = 312566; kgrp[22].loop = 6278;
kgrp[23].pos = 312567; kgrp[23].end = 330200; kgrp[23].loop = 2283;
kgrp[24].pos = 330201; kgrp[24].end = 348889; kgrp[24].loop = 2689;
kgrp[25].pos = 348890; kgrp[25].end = 365675; kgrp[25].loop = 4370;
kgrp[26].pos = 365676; kgrp[26].end = 383661; kgrp[26].loop = 5225;
kgrp[27].pos = 383662; kgrp[27].end = 393372; kgrp[27].loop = 2811;
kgrp[28].pos = 383662; kgrp[28].end = 393372; kgrp[28].loop = 2811; //ghost
kgrp[29].pos = 393373; kgrp[29].end = 406045; kgrp[29].loop = 4522;
kgrp[30].pos = 406046; kgrp[30].end = 414486; kgrp[30].loop = 2306;
kgrp[31].pos = 406046; kgrp[31].end = 414486; kgrp[31].loop = 2306; //ghost
kgrp[32].pos = 414487; kgrp[32].end = 422408; kgrp[32].loop = 2169;
//extra xfade looping...
for (int32_t k = 0; k < 28; k++)
{
int32_t p0 = kgrp[k].end;
int32_t p1 = kgrp[k].end - kgrp[k].loop;
float xf = 1.0f;
float dxf = -0.02f;
while (xf > 0.0f)
{
waves[p0] = (int16_t)((1.0f - xf) * (float)waves[p0] + xf * (float)waves[p1]);
p0--;
p1--;
xf += dxf;
}
}
// output
printf("#include <Arduino.h>\n\n");
printf("const int16_t epianoDataXfade[] PROGMEM = {\n");
for(uint32_t z=0; z<(844836/sizeof(int16_t)); z=z+20)
{
for(uint32_t i=0;i<20;i++)
{
if(z+i>=(uint32_t)(844836/sizeof(int16_t)))
break;
printf("%d,",waves[z+i]);
if(i>=19)
printf("\n");
}
}
printf("\n};\n");
}
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