LCD HITACHI HD44780 control extension for PHP
LCD is a PHP extension that provide you the commands to control HITACHI HD44780 display from your PHP script.
 TRY IT LIVE! DEMO AVAILABLE!
Interconnection between the FOX Board and a LCD with Hitachi HD44780 interface
The illustration is provided by:
http://www.acmesystems.it/?id=8021#delta
| Command |
|
Description |
| lcd_init() |
Initialize the display hardware |
lcd_init() prepare the display to accept commands
example:
<?
echo lcd_init();
?>
print on the sceen: 1
1 operation succeessfully executed
NULL an error occured and it is displayed in PHP WARNING message
|
| lcd_locate("row:column") |
change the cursor position
|
lcd_locate("row:column") move the cursor to the specified row and column.
example:
<?
echo lcd_locate("0:3");
?>
print on the sceen: 1 and move the cursor to the first row and column 3.
1 operation succeessfully executed
NULL an error occured and it is displayed in PHP WARNING message
|
| lcd_clear() |
empty the display character buffer
|
lcd_clear() empty the display character buffer
example:
<?
echo lcd_clear();
?>
print on the sceen: 1
1 operation succeessfully executed
NULL an error occured and it is displayed in PHP WARNING message
|
| lcd_printf("string") |
To display data on display |
lcd_printf("string") print the provided string on the display
example:
<?
echo lcd_printf("hello fox!");
?>
print on the sceen: 1 and "helloo fox!" appear on the display
1 operation succeessfully executed
NULL an error occured and it is displayed in PHP WARNING message
|
|
EXAMPLE
This example is a form with 3 fields, the text, the row and the column. Populating fields and pushing submit the text is displayed on specified position.
<?
$dsp=$_REQUEST['dsp'];
$ctl_display=lcd_init();
if ($ctl_display=="1")
{
lcd_clear();
}
else
{
echo "You have not a display connected to the fox!";
}
if ($dsp=="ok")
{
$text=$_REQUEST['text'];
$row=$_REQUEST['row'];
$col=$_REQUEST['col'];
$position=$row.":".$col;
lcd_locate($position);
lcd_printf($text);
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=ISO-8859-1">
<title>LCD Hitachi HD4478</title>
</head>
<body bgcolor="#ffffff" leftmargin="0" marginheight="0" marginwidth="0" topmargin="0">
<form action="<? echo $PHP_SELF; ?>" method="get" name="lcd">
<table border="1" cellspacing="2" cellpadding="0">
<tr>
<td><b>LCD Hitachi HD4478 - PHP extension sample</b></td>
<td></td>
</tr>
<tr>
<td>Text to display</td>
<td><input type="text" name="text" size="24" border="0"></td>
</tr>
<tr>
<td>Choose row </td>
<td><input type="text" name="row" value="0" border="0"></td>
</tr>
<tr>
<td>Choose column</td>
<td><input type="text" name="col" value="0" border="0"></td>
</tr>
<tr>
<td></td>
<td>
<input type="submit" name="display" value="display" border="0">
<input type="hidden" name="dsp" value="ok" border="0">
</td>
</tr>
</table>
</form>
</body>
</html>
|
|
Configuration files PATH
LCD configuration: /etc/php.ini
LOOK also GPIO I/O control extension for PHP
LOOK also I2C A/D converter PC8591 control extension for PHP |
For more info go to
ACME SYSTEMS WEBSITE LCD display
foXServe is Developed by KDEV a Davide Cantaluppi company and running on ACME SYSTEMS srl Hardware.
@ KDEV 2007 Some Rights Reserved
LICENSES
Apache/1.3.37 Server
Copyright 2007
Kdev of Davide Cantaluppi Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
PHP 5.0.5
"This product includes PHP software, freely available from <http://www.php.net/software/>"
MOD_DAV
This product includes software developed by Greg Stein <gstein@lyra.org> for use in the mod_dav module for Apache (http://www.webdav.org/mod_dav/).
