Added MIDI Channel setup mode, added disconnectDigitalIn to analogue inputs according to Mozzi docs

FLMNG/FLMNG.ino

@@ -27,6 +27,7 @@
 #include <mozzi_midi.h>
 #include <IntMap.h>
 #include <OverSample.h>
+#include <EEPROM.h>
 #include "config.h"
 
 IntMap kMapCarrierNote(  0, 4095, 24 * pitchSubSteps,  84 * pitchSubSteps );
@@ -53,6 +54,8 @@ bool MIDINotePlaying;
 bool gateIsHigh = false;
 float carrierFreq;
 long FMIntensity; // carries control info from updateControl to updateAudio
+byte MIDIChannel;
+byte memCode = "a";
 
 void MIDINoteOn(byte channel, byte note, byte velocity) {
   carrierFreq = mtof((int) note);
@@ -77,12 +80,78 @@ long softClip(long input) {
   }
 }
 
-void setup(){
+void setup() {
   pinMode(LED, OUTPUT);
   pinMode(GateIn, INPUT_PULLUP);
   pinMode(EnvSwitch, INPUT_PULLUP);
   pinMode(DroneSwitch, INPUT_PULLUP);
 
+  //MIDI Channel setup
+  if(!digitalRead(GateIn)) { //&& !digitalRead(DroneSwitch) && !digitalRead(EnvSwitch)) { //MIDI setup mode, first knob you rotate = MIDI channel
+    int knob1Orig = analogRead(Knob1);
+    int knob2Orig = analogRead(Knob2);
+    int knob3Orig = analogRead(Knob3);
+    int knob4Orig = analogRead(Knob4);
+    int knobAOrig = analogRead(KnobA);
+    int knobDROrig = analogRead(KnobDR);
+    int knobSOrig = analogRead(KnobS);
+    int threshhold = 50; //To reduce noise from the input, needs testing and fine-tuning
+    while(true) {
+      if(abs(analogRead(Knob1) - knob1Orig) > threshhold) { 
+        MIDIChannel = 1;
+        break;
+      } else if (abs(analogRead(Knob2) - knob2Orig) > threshhold) {
+        MIDIChannel = 2;
+        break;
+      } else if (abs(analogRead(Knob3) - knob3Orig) > threshhold) {
+        MIDIChannel = 3;
+        break;
+      } else if (abs(analogRead(Knob4) - knob4Orig) > threshhold) {
+        MIDIChannel = 4;
+        break;
+      } else if (abs(analogRead(KnobA) - knobAOrig) > threshhold) {
+        MIDIChannel = 5;
+        break;
+      } else if (abs(analogRead(KnobDR) - knobDROrig) > threshhold) {
+        MIDIChannel = 6;
+        break;
+      } else if (abs(analogRead(KnobS) - knobSOrig) > threshhold) {
+        MIDIChannel = 7;
+        break;
+      }
+      digitalWrite(LED, HIGH); //slow blinking to indicate the setup mode
+      delay(500);
+      digitalWrite(LED, LOW);
+      delay(500);
+    }
+    EEPROM.write(0, MIDIChannel);
+    EEPROM.write(1023, memCode);
+    digitalWrite(LED, LOW);
+    delay(150);
+    for(int i = 0; i < MIDIChannel; i ++) { //fast blink to indicate saved MIDI channel
+      digitalWrite(LED, HIGH);
+      delay(150);
+      digitalWrite(LED, LOW);
+      delay(150);
+    }
+    delay(500);
+  } else if (EEPROM.read(1023) == memCode) { 
+    MIDIChannel = EEPROM.read(0);
+  } else { //Save default MIDI Channel to EEPROM if it wasn't set
+    MIDIChannel = 1; //channel 1 by default
+    EEPROM.write(0, MIDIChannel);
+    EEPROM.write(1023, memCode);
+  }
+
+  disconnectDigitalIn(Knob1);
+  disconnectDigitalIn(Knob2);
+  disconnectDigitalIn(Knob3);
+  disconnectDigitalIn(Knob4);
+  disconnectDigitalIn(KnobA);
+  disconnectDigitalIn(KnobDR);
+  disconnectDigitalIn(KnobS);
+  disconnectDigitalIn(CVIn);
+
   MIDI.setHandleNoteOn(MIDINoteOn);
   MIDI.setHandleNoteOff(MIDINoteOff);
 
@@ -92,7 +161,7 @@ void setup(){
   MIDI.setHandleContinue(nullptr);
   MIDI.setHandleControlChange(nullptr);
 
-  MIDI.begin(MIDI_CHANNEL);
+  MIDI.begin(MIDIChannel);
   MIDI.turnThruOff();
 
   startMozzi();

FLMNG/config.h

@@ -2,7 +2,6 @@
 const int pitchSubSteps = 16; //set how many steps are there between semitones. set to 1 to quantize to semitones
 const int driveAmount = 350;
 const bool oversamplingEnabled = false; //makes V/OCT tracking more precise, but adds a little portamento
-#define MIDI_CHANNEL 2 //MIDI_CHANNEL_OMNI
 #define MOZZI_CONTROL_RATE 1024
 
 //Hardware Definitions