/*
  Made by Gustavo Silveira, 2019.
  - This Sketch reads the Arduino's digital and analog ports and send midi notes and midi control change

  http://www.musiconerd.com
  http://www.youtube.com/musiconerd
  http://facebook.com/musiconerdmusiconerd
  http://instagram.com/musiconerd/
  http://www.gustavosilveira.net
  [email protected]

  If you are using for anything that's not for personal use don't forget to give credit.

  PS: Just change the value that has a comment like " //* "

*/

/////////////////////////////////////////////
// Choosing your board
// Define your board, choose:
// "ATMEGA328" if using ATmega328 - Uno, Mega, Nano...
// "ATMEGA32U4" if using with ATmega32U4 - Micro, Pro Micro, Leonardo...
// "TEENSY" if using a Teensy board
// "DEBUG" if you just want to debug the code in the serial monitor
// you don't need to comment or uncomment any MIDI library below after you define your board

#define DEBUG 1 //* put here the uC you are using, like in the lines above followed by "1", like "ATMEGA328 1", "DEBUG 1", etc.

/////////////////////////////////////////////
// LIBRARIES
// -- Defines the MIDI library -- //

// if using with ATmega328 - Uno, Mega, Nano...
#ifdef ATMEGA328
#include <MIDI.h> // by Francois Best
//MIDI_CREATE_DEFAULT_INSTANCE();

// if using with ATmega32U4 - Micro, Pro Micro, Leonardo...
#elif ATMEGA32U4
#include "MIDIUSB.h"


#endif
// ---- //

//////////////////////////////////////////////
// Add this lib if using a cd4067 multiplexer
//#ifdef USING_MUX
//#include <Multiplexer4067.h>  // Multiplexer CD4067 library >> https://github.com/sumotoy/Multiplexer4067
//#endif

/////////////////////////////////////////////
// POTENTIOMETERS
const int N_POTS = 1; //* total number of pots (slide & rotary)
const int N_POTS_ARDUINO = 1;
const int POT_ARDUINO_PIN[N_POTS_ARDUINO] = {A0}; //* pins of each pot connected straight to the Arduino

int potCState[N_POTS] = {0}; // Current state of the pot
int potPState[N_POTS] = {0}; // Previous state of the pot
int potVar = 0; // Difference between the current and previous state of the pot

int midiCState[N_POTS] = {0}; // Current state of the MIDI value
int midiPState[N_POTS] = {0}; // Previous state of the MIDI value

const int TIMEOUT = 300; //* Amount of time the potentiometer will be read after it exceeds the varThreshold
const int varThreshold = 3; //* Threshold for the potentiometer signal variation
boolean potMoving = true; // If the potentiometer is moving
unsigned long PTime[N_POTS] = {0}; // Previously stored time
unsigned long timer[N_POTS] = {0}; // Stores the time that has elapsed since the timer was reset

// Are you using high res faders?
#define USING_HIGH_RES_FADERS 1 //* comment if not using high res faders (any fader can be high res)

// Are you using Motorized Faders?
//#define USING_MOTORIZED_FADERS 1 //* comment if not using a motorized fader




/////////////////////////////////////////////
// SETUP
void setup() {
  // Baud Rate
  // use if using with ATmega328 (uno, mega, nano...)
  // 31250 for MIDI class compliant | 115200 for Hairless MIDI
  Serial.begin(115200); //*

#ifdef DEBUG
  Serial.println("Debug mode");
  Serial.println();
#endif

}

/////////////////////////////////////////////
// LOOP
void loop() {
  potentiometers();
}

/////////////////////////////////////////////
// POTENTIOMETERS
void potentiometers() {
  for (int i = 0; i < N_POTS; i++) { // Loops through all the potentiometers
    potCState[i] = analogRead(POT_ARDUINO_PIN[i]); // reads the pins from arduino
    midiCState[i] = map(potCState[i], 0, 1023, 0, 127); // Maps the reading of the potCState to a value usable in midi
    potVar = abs(potCState[i] - potPState[i]); // Calculates the absolute value between the difference between the current and previous state of the pot

    if (potVar > varThreshold) { // Opens the gate if the potentiometer variation is greater than the threshold
      PTime[i] = millis(); // Stores the previous time
    }

    timer[i] = millis() - PTime[i]; // Resets the timer 11000 - 11000 = 0ms

    if (timer[i] < TIMEOUT) { // If the timer is less than the maximum allowed time it means that the potentiometer is still moving
      potMoving = true;
    } else {
      potMoving = false;
    }

    if (potMoving == true) { // If the potentiometer is still moving, send the change control
      if (midiPState[i] != midiCState[i]) {

        // Sends the MIDI CC accordingly to the chosen board
#ifdef ATMEGA328
        // use if using with ATmega328 (uno, mega, nano...)
        MIDI.sendControlChange(cc + i, midiCState[i], midiCh); // cc number, cc value, midi channel

#elif ATMEGA32U4
        //use if using with ATmega32U4 (micro, pro micro, leonardo...)
        controlChange(midiCh, cc + i, midiCState[i]); //  (channel, CC number,  CC value)
        MidiUSB.flush();

#elif TEENSY
        //do usbMIDI.sendControlChange if using with Teensy
        usbMIDI.sendControlChange(cc + i, midiCState[i], midiCh); // cc number, cc value, midi channel

#elif DEBUG
        Serial.print("Pot: ");
        Serial.print(i);
        Serial.print(" ");
        Serial.println(midiCState[i]);
        //Serial.print("  ");
#endif

        potPState[i] = potCState[i]; // Stores the current reading of the potentiometer to compare with the next
        midiPState[i] = midiCState[i];
      }
    }
  }
}


/////////////////////////////////////////////
// if using with ATmega32U4 (micro, pro micro, leonardo...)
#ifdef ATMEGA32U4

// Arduino (pro)micro midi functions MIDIUSB Library
void noteOn(byte channel, byte pitch, byte velocity) {
  midiEventPacket_t noteOn = {0x09, 0x90 | channel, pitch, velocity};
  MidiUSB.sendMIDI(noteOn);
}

void noteOff(byte channel, byte pitch, byte velocity) {
  midiEventPacket_t noteOff = {0x08, 0x80 | channel, pitch, velocity};
  MidiUSB.sendMIDI(noteOff);
}

void controlChange(byte channel, byte control, byte value) {
  midiEventPacket_t event = {0x0B, 0xB0 | channel, control, value};
  MidiUSB.sendMIDI(event);
}
#endif