.. _lcd-library:

HD44780 LCD driver library for PIC18 microcontrollers
=====================================================

:date: 14 August, 2010

This project implements a simple library for interfacing to HD44780-compatible
LCD displays. The code was tested on PIC18F4550 and PIC18F66K22
microcontrollers. Some of the features:

   * LCD initialization
   * Sending commands and data
   * Ability to write strings to the LCD
   * Ability to move cursor to a selected location
   * Custom character loading

Results
-------

Here is a picture of the LCD library in action. The content on the LCD was
generated by the code shown below.

.. raw:: html

   <p>
       <a href="https://picasaweb.google.com/lh/photo/EesuRebzxwr7SqJUU8op2g?feat=embedwebsite">
           <img src="https://lh5.googleusercontent.com/_is7PcgDfyqQ/TcvqEplbPqI/AAAAAAAABs8/CUE0yPFpzug/s400/DSC_0004.JPG" height="266" width="400" />
       </a>
   </p>

.. code-block:: c

   void main(void)
   {
       // set ports as outputs
       TRISC = 0x00;
       TRISD = 0x00;

       lcd_initialize();

       lcd_goto(1, 5);
       lcd_write_pgm("Armandas");
       lcd_goto(2, 1);
       lcd_write_pgm("www.armandas.lt");
    
       while (1);  
   }


Links
-----

   * C Source code: http://github.com/armandas/Yet-Another-LCD-Library

References
----------

   * HITACHI HD44780U datasheet
   * http://www.nongnu.org/avr-libc/user-manual/group__stdiodemo.html
   * http://code.google.com/p/arduino/source/browse/trunk/libraries/LiquidCrystal/