// include the library code:
#include <LiquidCrystal_I2C.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);


void setup() { 
  Serial.begin(9600);
  // set up the LCD's number of rows and columns: 
  lcd.init();
  lcd.clear();
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("Arduino Corp.  ");
  lcd.setCursor(0,1);
  lcd.print("       Ver: 2.0");
  delay(2000);
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print(" Cmp. Smart LCD");
  lcd.setCursor(0,1);
  lcd.print("  Program #001");
  delay(3000);
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("**LCD SMARTIE**");
  lcd.setCursor(0,1);
  lcd.print("*  Version 01 *");
}

byte serial_getch(){
  
  int incoming;  
  while (Serial.available()==0){}
	// read the incoming byte:
  incoming = Serial.read();

  return (byte) (incoming &0xff);
}

void loop(){

  byte rxbyte;
  byte temp;

  rxbyte = serial_getch();

  if (rxbyte == 254) //Matrix Orbital uses 254 prefix for commands
  {
    switch (serial_getch())
    {
    case 66: //backlight on (at previously set brightness)
      // not implemented				

      break;
    case 70: //backlight off
      // not implemented				
      break;
    case 71:  //set cursor position
      temp = (serial_getch() - 1);  //get column byte
      switch (serial_getch())  //get row byte
      {
        //line 1 is already set up
      case 2:
        temp += 0x40;
        break;
      case 3:
        temp += 0x14;
        break;
      case 4:
        temp += 0x54;
        break;
      default:
        break;
      }
      lcd.command(0b10000000 + temp);
      break;
    case 72:  //cursor home (reset display position)
      lcd.command(2);
      break;
    case 74:  //show underline cursor
      lcd.command(0b00001110);
      break;
    case 75:  //underline cursor off
    case 84:  //block cursor off
      lcd.command(0b00001100);
      break;
    case 76:  //move cursor left
      lcd.command(16);
      break;
    case 77:  //move cursor right
      lcd.command(20);
      break;
    case 78:  //define custom char
      lcd.command(64 + (serial_getch() * 8));  //get+set char address
      for (temp = 7; temp != 0; temp--)
      {
        lcd.print(serial_getch()); //get each pattern byte
      }
      break;
    case 83:  //show blinking block cursor
      lcd.command(0b00001111);
      break;
    case 86:  //GPO OFF
      //implement later
      break;
    case 87:  //GPO ON
      /*temp = serial_getch();
       				if (temp == 1)
       				{
       					GPO1 = GPO_ON;
       				}*/
      break;
    case 88:  //clear display, cursor home
      lcd.command(1);
      break;
    case 152: //set and remember (doesn't save value, though)
    case 153: //set backlight brightness
      //not implemented
      break;

      //these commands ignored (no parameters)
    case 35: //read serial number
    case 36: //read version number
    case 55: //read module type
    case 59: //exit flow-control mode
    case 65: //auto transmit keypresses
    case 96: //auto-repeat mode off (keypad)
    case 67: //auto line-wrap on
    case 68: //auto line-wrap off
    case 81: //auto scroll on
    case 82: //auto scroll off
    case 104: //init horiz bar graph
    case 109: //init med size digits
    case 115: //init narrow vert bar graph
    case 118: //init wide vert bar graph
      break;
    default:
      //all other commands ignored and parameter byte discarded
      temp = serial_getch();  //dump the command code
      break;
    }
    return;
  } //END OF COMMAND HANDLER

  //change accented char to plain, detect and change descenders
  //NB descenders only work on 5x10 displays. This lookup table works
  //  with my DEM-20845 (Display Elektronik GmbH) LCD using KS0066 chip.
  switch (rxbyte)
  {
    //chars that have direct equivalent in LCD charmap
    /*		case 0x67: //g
     			rxbyte = 0xE7;
     			break;
     		case 0x6A: //j
     			rxbyte = 0xEA;
     			break;
     		case 0x70: //p
     			rxbyte = 0xF0;
     			break;
     		case 0x71: //q
     			rxbyte = 0xF1;
     			break;
     		case 0x79: //y
     			rxbyte = 0xF9;
     			break;
     */  case 0xE4: //ASCII "a" umlaut
    rxbyte = 0xE1;
    break;
  case 0xF1: //ASCII "n" tilde
    rxbyte = 0xEE;
    break;
  case 0xF6: //ASCII "o" umlaut
    rxbyte = 0xEF; //was wrong in v0.86
    break;
  case 0xFC: //ASCII "u" umlaut
    rxbyte = 0xF5;
    break;

    //accented -> plain equivalent
    //and misc symbol translation
  case 0xA3: //sterling (pounds)
    rxbyte = 0xED;
    break;
    /*		case 0xB0: //degrees symbol
     			rxbyte = 0xDF;
     			break;
     */  case 0xB5: //mu
    rxbyte = 0xE4;
    break;
  case 0xC0: //"A" variants
  case 0xC1:
  case 0xC2:
  case 0xC3:
  case 0xC4:
  case 0xC5:
    rxbyte = 0x41;
    break;
  case 0xC8: //"E" variants
  case 0xC9:
  case 0xCA:
  case 0xCB:
    rxbyte = 0x45;
    break;
  case 0xCC: //"I" variants
  case 0xCD:
  case 0xCE:
  case 0xCF:
    rxbyte = 0x49;
    break;
  case 0xD1: //"N" tilde -> plain "N"
    rxbyte = 0x43;
    break;
  case 0xD2: //"O" variants
  case 0xD3:
  case 0xD4:
  case 0xD5:
  case 0xD6:
  case 0xD8:
    rxbyte = 0x4F;
    break;
  case 0xD9: //"U" variants
  case 0xDA:
  case 0xDB:
  case 0xDC:
    rxbyte = 0x55;
    break;
  case 0xDD: //"Y" acute -> "Y"
    rxbyte = 0x59;
    break;
    /*		case 0xDF: //beta  //mucks up LCDSmartie's degree symbol??
     			rxbyte = 0xE2;
     			break;
     */  case 0xE0: //"a" variants except umlaut
  case 0xE1:
  case 0xE2:
  case 0xE3:
  case 0xE5:
    rxbyte = 0x61;
    break;
  case 0xE7: //"c" cedilla -> "c"
    rxbyte = 0x63;
    break;
  case 0xE8: //"e" variants
  case 0xE9:
  case 0xEA:
  case 0xEB:
    rxbyte = 0x65;
    break;
  case 0xEC: //"i" variants
  case 0xED:
  case 0xEE:
  case 0xEF:
    rxbyte = 0x69;
    break;
  case 0xF2: //"o" variants except umlaut
  case 0xF3:
  case 0xF4:
  case 0xF5:
  case 0xF8:
    rxbyte = 0x6F;
    break;
  case 0xF7: //division symbol
    rxbyte = 0xFD;
    break;
  case 0xF9: //"u" variants except umlaut
  case 0xFA:
  case 0xFB:
    rxbyte = 0x75;
    break;
  default:
    break;
  }

  lcd.print(rxbyte);  //otherwise a plain char so we print it to lcd
  return;


}