File content as of revision 1:6ad3406d5912:

/*********************************************************************************************************************** 
This library is based upon the original TextLCD library. This library has been modified so it can be used with a 16x4 LCD
The traditional 'wait' function has been chnaged to use 16 bit Timer 1 rather than 32 bit Timer 0 which is what is set up 
usually in the mbed library. The reason for this change is so that the new wait function and this library could be used 
alongside a PulseWidthCapture program which needs to use the 32 bit timer. 

This program requires Library 'LCD_Wait' to work
Callum Ellor
**************************************************************************************************************************/

#ifndef MBED_TEXTLCD_H
#define MBED_TEXTLCD_H

#include "mbed.h"

/**  A TextLCD interface for driving 4-bit HD44780-based LCDs
 *
 * Currently supports 16x2, 20x2 and 20x4 panels
 *
 * @code
 * #include "mbed.h"
 * #include "TextLCD.h"
 * 
 * TextLCD lcd(p10, p12, p15, p16, p29, p30); // rs, e, d4-d7
 * 
 * int main() {
 *     lcd.printf("Hello World!\n");
 * }
 * @endcode
 */
class TextLCD : public Stream {
public:

    /** LCD panel format */
    enum LCDType {
        LCD16x2     /**< 16x2 LCD panel (default) */
        , LCD16x2B  /**< 16x2 LCD panel alternate addressing */
        , LCD20x2   /**< 20x2 LCD panel */
        , LCD20x4   /**< 20x4 LCD panel */
        , LCD16x4   /**< 16x4 LCD panel */          //added to work with 16x4
    };

    /** Create a TextLCD interface
     *
     * @param rs    Instruction/data control line
     * @param e     Enable line (clock)
     * @param d4-d7 Data lines for using as a 4-bit interface
     * @param type  Sets the panel size/addressing mode (default = LCD16x2)
     */
    TextLCD(PinName rs, PinName e, PinName d4, PinName d5, PinName d6, PinName d7, LCDType type = LCD16x2);

#if DOXYGEN_ONLY
    /** Write a character to the LCD
     *
     * @param c The character to write to the display
     */
    int putc(int c);

    /** Write a formated string to the LCD
     *
     * @param format A printf-style format string, followed by the
     *               variables to use in formating the string.
     */
    int printf(const char* format, ...);
#endif

    /** Locate to a screen column and row
     *
     * @param column  The horizontal position from the left, indexed from 0
     * @param row     The vertical position from the top, indexed from 0
     */
    void locate(int column, int row);

    /** Clear the screen and locate to 0,0 */
    void cls();

    int rows();
    int columns();

protected:

    // Stream implementation functions
    virtual int _putc(int value);
    virtual int _getc();

    int address(int column, int row);
    void character(int column, int row, int c);
    void writeByte(int value);
    void writeCommand(int command);
    void writeData(int data);
    int wait_n;

    DigitalOut _rs, _e;
    BusOut _d;
    LCDType _type;

    int _column;
    int _row;
    
};

#endif