File content as of revision 0:4f1c764a42d3:

/***************************************************
  This is a library for the Adafruit RGB 16x2 LCD Shield
  Pick one up at the Adafruit shop!
  ---------> http://http://www.adafruit.com/products/714

  The shield uses I2C to communicate, 2 pins are required to
  interface
  Adafruit invests time and resources providing this open source code,
  please support Adafruit and open-source hardware by purchasing
  products from Adafruit!

  Written by Limor Fried/Ladyada for Adafruit Industries.
  BSD license, all text above must be included in any redistribution
 ****************************************************/

#ifndef ADAFRUIT_I2C_LCD_H
#define ADAFRUIT_I2C_LCD_H

#include "Adafruit_MCP23017.h"

// commands
#define LCD_CLEARDISPLAY 0x01
#define LCD_RETURNHOME 0x02
#define LCD_ENTRYMODESET 0x04
#define LCD_DISPLAYCONTROL 0x08
#define LCD_CURSORSHIFT 0x10
#define LCD_FUNCTIONSET 0x20
#define LCD_SETCGRAMADDR 0x40
#define LCD_SETDDRAMADDR 0x80

// flags for display entry mode
#define LCD_ENTRYRIGHT 0x00
#define LCD_ENTRYLEFT 0x02
#define LCD_ENTRYSHIFTINCREMENT 0x01
#define LCD_ENTRYSHIFTDECREMENT 0x00

// flags for display on/off control
#define LCD_DISPLAYON 0x04
#define LCD_DISPLAYOFF 0x00
#define LCD_CURSORON 0x02
#define LCD_CURSOROFF 0x00
#define LCD_BLINKON 0x01
#define LCD_BLINKOFF 0x00

// flags for display/cursor shift
#define LCD_DISPLAYMOVE 0x08
#define LCD_CURSORMOVE 0x00
#define LCD_MOVERIGHT 0x04
#define LCD_MOVELEFT 0x00

// flags for function set
#define LCD_8BITMODE 0x10
#define LCD_4BITMODE 0x00
#define LCD_2LINE 0x08
#define LCD_1LINE 0x00
#define LCD_5x10DOTS 0x04
#define LCD_5x8DOTS 0x00

#define BUTTON_UP 0x08
#define BUTTON_DOWN 0x04
#define BUTTON_LEFT 0x10
#define BUTTON_RIGHT 0x02
#define BUTTON_SELECT 0x01

#define HIGH true
#define LOW false

#include "mbed.h"

class Adafruit_I2C_LCD
{
public:
    Adafruit_I2C_LCD(I2C *master, uint8_t cols, uint8_t lines, uint8_t dotsize = LCD_5x8DOTS);
    ~Adafruit_I2C_LCD();

    void clear();
    void home();

    void noDisplay();
    void display();
    void noBlink();
    void blink();
    void noCursor();
    void cursor();
    void scrollDisplayLeft();
    void scrollDisplayRight();
    void leftToRight();
    void rightToLeft();
    void autoscroll();
    void noAutoscroll();

    // only if using backpack
    void setBacklight(uint8_t status);

    void createChar(uint8_t, uint8_t[]);
    void setCursor(uint8_t, uint8_t);
    void write(uint8_t);
    void print(char *, size_t);
    void command(uint8_t);
    uint8_t readButtons();

private:
	void begin(uint8_t cols, uint8_t rows, uint8_t charsize = LCD_5x8DOTS);
	
    void send(uint8_t, uint8_t);
    void write4bits(uint8_t);
    void write8bits(uint8_t);
    void pulseEnable();
    void _digitalWrite(uint8_t, uint8_t);
    void _pinMode(uint8_t, uint8_t);

    uint8_t _rs_pin; // LOW: command.  HIGH: character.
    uint8_t _rw_pin; // LOW: write to LCD.  HIGH: read from LCD.
    uint8_t _enable_pin; // activated by a HIGH pulse.
    uint8_t _data_pins[8];
    uint8_t _button_pins[5];
    uint8_t _displayfunction;
    uint8_t _displaycontrol;
    uint8_t _displaymode;

    uint8_t _initialized;

    uint8_t _numlines,_currline;

    uint8_t _i2cAddr;
    Adafruit_MCP23017 *_i2c;
};

#endif