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teensymoog/minimoog_mega_2/minimoog_mega_2.ino

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7.6 KiB

// Minimoog - mega 2
/*
* This program is part of a minimoog-like synthesizer based on teensy 4.0
* Copyright (C) 2020 Pierre-Loup Martin
*
* 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, see <http://www.gnu.org/licenses/>.
*/
/* This program is a synthesizer very similar to the minimoog model D.
* It is intended to run on a Teensy 4.0, using the PJRC audio library.
* It also uses two Arduino Mega boards to manage all the user inputs :
* keyboard, switches, potentiometers, etc.
* All user inputs are handled and send to the teensy board using midi commands
*/
/*
* This program is for the Arduino Mega 2, it handles the readings of :
* Category input type pin MIDI
*
* Oscillators
* global tune pot A0 CC 9
* osc 2 tune pot A1 CC 14
* osc 3 tune pot A2 CC 15
* Filter
* filter pass pot A3 CC 19
* cutoff frequency pot A4 CC 20
* emphasis pot A5 CC 21
* contour pot A6 CC 22
* attack pot A7 CC 23
* decay pot A8 CC 24
* sustain pot A9 CC 25
* release pot A10 CC 26
* filter modulation switch 2 CC 109
* keyboard control 1 switch 3 CC 110
* keyboard control 2 switch 4 CC 111
* Enveloppe
* attack pot A11 CC 27
* decay pot A12 CC 28
* sustain pot A13 CC 29
* release pot A14 CC 30
* Mixer
* master volume pot A15 CC 07
* Communication
* TX1 to teensy 18
* RX1 from teensy 19
*/
/*
* Note on switches : every switch is active low, using the internal pull-up resistor.
*/
/*
* Note : Mega 2 has less things to handle then the Mega 1, but main functions are the same.
* See Mega1.ino for more exhaustive comments on functions.
*/
// includes
#include "MIDI.h" // https://github.com/FortySevenEffects/arduino_midi_library
#include "PushButton.h" // https://github.com/troisiemetype/PushButton
#include "ExpFilter.h" // https://github.com/troisiemetype/expfilter
#include "defs.h"
// Constants
const uint8_t NUM_SWITCHES = 3;
const uint8_t NUM_POTS = 16;
const uint8_t POT_FILTER_COEF = 20;
// Note : pins are defined via tables, to improve code efficiency.
// Digital pin definition
// Only three digital pins are used, from 2 to 4. So this one is used as base to set the table in setup().
const uint8_t PIN_FILTER_MOD = 2;
/*
const uint8_t PIN_KEYBOARD_CTRL_1 = 3;
const uint8_t PIN_KEYBOARD_CTRL_2 = 4;
*/
// Analog pin definition
/*
const uint8_t APIN_GLOBAL_TUNE = A0;
const uint8_t APIN_OSC2_TUNE = A1;
const uint8_t APIN_OSC3_TUNE = A2;
const uint8_t APIN_FILTER_BAND = A3;
const uint8_t APIN_FILTER_CUTOFF = A4;
const uint8_t APIN_FILTER_EMPHASIS = A5;
const uint8_t APIN_FILTER_CONTOUR = A6;
const uint8_t APIN_FILTER_ATTACK = A7;
const uint8_t APIN_FILTER_DECAY = A8;
const uint8_t APIN_FILTER_SUSTAIN = A9;
const uint8_t APIN_FILTER_RELEASE = A10;
const uint8_t APIN_ATTACK = A11;
const uint8_t APIN_DECAY = A12;
const uint8_t APIN_SUSTAIN = A13;
const uint8_t APIN_RELEASE = A14;
*/
const uint8_t APIN[NUM_POTS] = {A0, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15};
// Variables
uint16_t potState[NUM_POTS];
PushButton switches[NUM_SWITCHES];
ExpFilter pots[NUM_POTS];
bool update = 0;
struct midiSettings : public midi::DefaultSettings{
// static const bool UseRunningStatus = true;
static const long BaudRate = 115200;
};
// The one we use on synth
MIDI_CREATE_CUSTOM_INSTANCE(HardwareSerial, Serial1, midi1, midiSettings);
// For debug purposes
//MIDI_CREATE_CUSTOM_INSTANCE(HardwareSerial, Serial, midi1, midiSettings);
void setup(){
for(uint8_t i = 0; i < NUM_SWITCHES; ++i){
switches[i].begin(i + PIN_FILTER_MOD, INPUT_PULLUP);
switches[i].setDebounceDelay(1);
}
for (uint8_t i = 0; i < NUM_POTS; ++i){
pots[i].begin(analogRead(APIN[i]));
pots[i].setCoef(POT_FILTER_COEF);
}
// Run init sequence to debounce switches and filter pots, so it's running for stable values.
// This one causes a bug on Mega 1, that I don't understand.
// Here it works perfect, when the system powers up every control is updated to its current state.
uint32_t initEnd = millis() + 500;
while(millis() < initEnd){
for(uint8_t i = 0; i < NUM_SWITCHES; ++i){
switches[i].update();
}
for(uint8_t i = 0; i < NUM_POTS; ++i){
uint16_t value = pots[i].filter(analogRead(APIN[i]));
potState[i] = value;
}
}
midi1.setHandleControlChange(handleControlChange);
midi1.begin(1);
midi1.turnThruOff();
}
void loop(){
midi1.read();
updateControls();
updateSwitches();
update = 0;
}
void updateControls(){
for(uint8_t i = 0; i < NUM_POTS; ++i){
uint16_t value = 0;
value = pots[i].filter(analogRead(APIN[i]));
if((value != potState[i]) || update){
potState[i] = value;
} else {
// If not change, skip midi update
continue;
}
int8_t controlChange = -1;
switch(i){
case 0:
controlChange = CC_OSC_TUNE;
break;
case 1:
controlChange = CC_OSC2_TUNE;
break;
case 2:
// This one has a problem : sends CC10 (instead of CC13) then CC45 as should be.
// or maybe pure data has a bug that shifts bits.
// It seems it's a bug of pure data : 13 are replaced by 10 also for values...
controlChange = CC_OSC3_TUNE;
break;
case 3:
controlChange = CC_FILTER_BAND;
break;
case 4:
controlChange = CC_FILTER_CUTOFF_FREQ;
break;
case 5:
controlChange = CC_FILTER_EMPHASIS;
break;
case 6:
controlChange = CC_FILTER_CONTOUR;
break;
case 7:
controlChange = CC_FILTER_ATTACK;
break;
case 8:
controlChange = CC_FILTER_DECAY;
break;
case 9:
controlChange = CC_FILTER_SUSTAIN;
break;
case 10:
controlChange = CC_FILTER_RELEASE;
break;
case 11:
controlChange = CC_EG_ATTACK;
break;
case 12:
controlChange = CC_EG_DECAY;
break;
case 13:
controlChange = CC_EG_SUSTAIN;
break;
case 14:
controlChange = CC_EG_RELEASE;
break;
case 15:
controlChange = CC_CHANNEL_VOL;
break;
default:
continue;
}
uint8_t valueHigh = value >> 7;
uint8_t valueLow = value & 0x7F;
midi1.sendControlChange(controlChange, valueHigh, 1);
midi1.sendControlChange(controlChange + 32, valueLow, 1);
}
}
void updateSwitches(){
for(uint8_t i = 0; i < NUM_SWITCHES; ++i){
uint8_t change = 0;
switches[i].update();
if(switches[i].justPressed()){
change = 127;
} else if(switches[i].justReleased()){
change = 0;
} else if(update){
change = (uint8_t)switches[i].isPressed();
change *= 127;
} else {
// If no change, skip the midi command sending.
continue;
}
int8_t controlChange = -1;
switch(i){
case 0:
controlChange = CC_FILTER_MOD;
break;
case 1:
controlChange = CC_FILTER_KEYTRACK_1;
break;
case 2:
controlChange = CC_FILTER_KEYTRACK_2;
break;
default:
continue;
}
midi1.sendControlChange(controlChange, change, 1);
}
}
void handleControlChange(uint8_t channel, uint8_t command, uint8_t value){
switch(command){
case CC_ASK_FOR_DATA:
update = 1;
break;
}
}