*BUILD LOG* 'CDJ 2000'-style DIY Traktor controller

#include <WProgram.h>
#include <LiquidCrystal.h>
#include <Midi.h>

struct DENON_SEGMENT {
  boolean valid;
  byte seg;
  byte col;
  byte val;
};

class MyMidi : public Midi {
  public:

  MyMidi(HardwareSerial &s) : Midi(s) {}

  void handleControlChange(unsigned int channel, unsigned int controller, unsigned int value) {
    if (channel == 1 || channel == 2) {
      DENON_SEGMENT data = checkForSegmentData(controller, value);
      if (data.valid == true) track_name(data.seg, data.col+2, data.val); // col+2 to center it on my 2x16 screen (the denon only has a 2x12)
    }
  }
};

MyMidi midi(Serial);
LiquidCrystal lcd(8, 11, 9, 4, 5, 6, 7); // initialize the library with the numbers of the interface pins

void setup() {
  lcd.begin(2, 16);
  digitalWrite(14, HIGH);
  midi.begin(0);
}

void loop() {
  midi.poll();
}

struct DENON_SEGMENT checkForSegmentData(byte controller, byte value) {
  static byte seg1MSB, seg2MSB = 0;
  if ((controller >= 0x01 && controller <= 0x05) || (controller >= 0x07 && controller <= 0x0D)) { // segment 1 MSB
    seg1MSB = value;
    return (DENON_SEGMENT){false,0,0,0}; // incomplete packet
  }
  if (controller >= 0x0E && controller <= 0x19) { // segment 2 MSB
    seg2MSB = value;
    return (DENON_SEGMENT){false,0,0,0}; // incomplete packet
  }
  if ((controller >= 0x21 && controller <= 0x25) || (controller >= 0x27 && controller <= 0x2D)) { // segment 1 LSB
    return (DENON_SEGMENT){true, 0, getColumn(controller, 1), ((seg1MSB<<4) + value)}; // return completed packet
  }
  if (controller >= 0x2E && controller <= 0x39) { // segment 2 LSB
    return (DENON_SEGMENT){true, 1, getColumn(controller, 2), ((seg2MSB<<4) + value)}; // return completed packet
  }
}

// parameters: cc- controller number, seg- segment number
// returns: column number (zero indexed) or 255 if invalid segment
byte getColumn(byte cc, byte seg) {
  byte col=255;
  if (seg == 1) {
    col = cc - 33; // convert into segment number (column)
    if (col >= 6) col--; // work around the fact that Denon skipped 0x06 for segment 1-6 (they got segment 2 correct)
  } else if (seg == 2) {
    col = cc - 46; // convert into segment number (column)
  }
  return col;
}

void track_name(byte lcd_row, byte lcd_col, byte lcd_data){
  lcd.setCursor(lcd_col, lcd_row);
  lcd.print(lcd_data); 
}

!F1::			          ; adds a windows hothey (alt+F1)
 X:= 0x32                     ; Hex 32 is equivalent to Decimal 50
 X:= X + 0                    ; adding zero to a Hex number converts it to Dec
 Msgbox X=%X%            ; this Msgbox command should display Dec 50
 msgbox % Chr(X)	   ; this Msgbox command should display Chr 2

 RETURN

void receiveMIDI(byte statusType, byte MIDIchannel, byte param1, byte param2){

  switch (statusType) {

    break;
    case 0xB0:
    ///// IF MESSAGE IS CONTROL CHANGE MESSAGE (0xB0) /////

    switch(param1){ // CHECKS CC NUMBER, MSB GETS PUT IN tn_byte1
      
     case  0x01:
           tn_byte1 = (param2 << 4);
     break;
     case  0x02:
           tn_byte1 = (param2 << 4);
     break;
     case  0x03:
           tn_byte1 = (param2 << 4);
     break;
     case  0x04:
           tn_byte1 = (param2 << 4);
     break;
     case  0x05:
           tn_byte1 = (param2 << 4);
     break;
     case  0x07:
           tn_byte1 = (param2 << 4);
     break;
     case  0x08:
           tn_byte1 = (param2 << 4);
     break;
     case  0x09:
           tn_byte1 = (param2 << 4);
     break;
     case  0x21: // BEGIN LSB, MSB IS READY IN tn_byte1
      tn_byte2 = param2;
      tn_output = tn_byte1 | tn_byte2;
      track_name(0 , 0 , tn_output); // FIRES LCD PRINT WITH CO-ORDS AND CHAR DATA          
     break;
     case  0x22:
      tn_byte2 = param2;
      tn_output = tn_byte1 | tn_byte2;
      track_name(1 , 0 , tn_output);      
     break;
     case  0x23:
      tn_byte2 = param2;
      tn_output = tn_byte1 | tn_byte2;
      track_name(2 , 0 , tn_output);
     break;
     case  0x24:
      tn_byte2 = param2;
      tn_output = tn_byte1 | tn_byte2;
      track_name(3 , 0 , tn_output);
     break;
     case  0x25:
      tn_byte2 = param2;
      tn_output = tn_byte1 | tn_byte2;
      track_name(4 , 0 , tn_output);
     break;
     case  0x27:
      tn_byte2 = param2;
      tn_output = tn_byte1 | tn_byte2;
      track_name(5 , 0 , tn_output);
     break;
     case  0x28:
      tn_byte2 = param2;
      tn_output = tn_byte1 | tn_byte2;
      track_name(6 , 0 , tn_output);
     break;
     case  0x29:
      tn_byte2 = param2;
      tn_output = tn_byte1 | tn_byte2;
      track_name(7 , 0 , tn_output);
     break;
      
    }

}

}

void track_name(byte lcd_col, byte lcd_row, byte lcd_data){
  
      lcd.setCursor(lcd_col , lcd_row);
      lcd.print(lcd_data); 
  
  
}