Arduino Launchpad

midi.ino

#include <MIDI.h>
#include <SoftwareSerial.h>
#include <DFPlayer_Mini_Mp3.h>
#include <math.h>

SoftwareSerial mySerial(11, 10); // RX, TX

MIDI_CREATE_DEFAULT_INSTANCE();

bool isMp3Mode = false;

const byte ROWS = 4; // - Number of rows of the matrix keyboard
const byte COLS = 4; // - Number of columns of the matrix keyboard
byte rowPins[ROWS] = {2, 3, 4, 5}; // - Row Pins
byte colPins[COLS] = {6, 7, 8, 9}; //--Column Pins

byte buttonState[COLS][ROWS] = { // - Array of button states
  {1, 1, 1, 1},
  {1, 1, 1, 1},
  {1, 1, 1, 1},
  {1, 1, 1, 1}
};

byte kpdNote[COLS][ROWS] = { //Array of Notes
  {51, 47, 43, 39},
  {50, 46, 42, 38},
  {49, 45, 41, 37},
  {48, 44, 40, 36}
};

byte dval = 0;
int pval = 0;

int potPrVal[4] = {0, 0, 0, 0}; // - Array of potentiometers
byte potPins[4] = {1, 2, 3, 4}; //--Pins of potentiometers

void setup() {
  MIDI.begin();  //Initializing the MIDI interface

  for(byte i = 0; i < COLS; i++){     //--Configure the lines of the metric columns as outputs--
    pinMode(colPins[i], OUTPUT);     //--and submit to them a log. 1-----------------------
    digitalWrite(colPins[i], HIGH);  // ----------------------------------------------
  }                                        
  for(byte i = 0; i < ROWS; i++) {   //--Configure the columns of the metric columns as inputs--------- 
    pinMode(rowPins[i], INPUT);      //--and include built-in μ pull-up resistors--
    digitalWrite(rowPins[i], HIGH);  //------------------------------------------------------
  }

  pinMode(mp3Pin, INPUT);
  digitalWrite(mp3Pin, HIGH);

  Serial.begin(115200);
  mySerial.begin(9600);
  mp3_set_serial(mySerial);    //--set softwareSerial for DFPlayer-mini mp3 module 
  delay(1);                    //--delay 1ms to set volume
  mp3_set_volume(20);          //--value 0~30
}

void loop() {
  for(byte chn = 0; chn < 4; chn++)        //-Read cycle of potentiometer values-----------
  {
    pval = analogRead(potPins[chn]);
    if (abs(pval-potPrVal[chn]) > 10) {                                //--If the current value is ex. from the past
       MIDI.sendControlChange(1, chn, pval); 
       
       potPrVal[chn] = pval;
       if (chn == 3) {
       }
    }
  }
  //-------------------------------------
  for(byte col = 0; col < COLS; col++)                            //-Matrix keyboard read cycle----- 
  {
    digitalWrite(colPins[col], LOW);                              //--On the read column we set 0---
    for(byte row = 0; row < ROWS; row++)                          //--Read each column line by row--
      {                                                           //--And at the pressed button we transfer the note--
        dval = digitalRead(rowPins[row]);
        if ( dval == LOW && buttonState[col][row] == HIGH ) {
          MIDI.sendNoteOn(kpdNote[col][row], 127, 1);
        }
        if ( dval == HIGH && buttonState[col][row] == LOW ) {
          MIDI.sendNoteOff(kpdNote[col][row], 0, 1); 
        }
        buttonState[col][row] = dval;
      }
     digitalWrite(colPins[col], HIGH);  
  }
}