acd1.htm

FM MUDULATION SYSTEM COMUNICATION

<font face="ARIAL">The LCD panel requires 
a few instructions to be sent, to order to turn on the display and initialise it. This
is what the first <i>for</i> loop does. These instructions must be sent to the LCD's
<i>Instruction Register</i> which is controlled by the <i>Register Select</i> (Pin 4). When pin 4
is low the instruction register is selected, thus when high the data register must
be selected. We connect this to the Parallel Port's <i>Select Printer</i> line which happens
to be hardware inverted. Therefore if we write a '1' to bit 3 of the Control Register
the <i>Select Printer</i> line goes low.
</font></p>
<p>
<font face="ARIAL">We want to first send instructions to the LCD module. Therefore the <i>Register Select</i> 
line must be low. As it is hardware inverted, we will want to set bit 3 of the 
Control Register to '1'. However we don't want to upset any other bits on the 
Control Port. We achieve this by reading the Control Port and OR'ing 0x80 to it. e.g. <tt>
outportb(CONTROL, inportb(CONTROL) | 0x08);</tt> This will only set bit 3.
</font></p><p>
</p><p>
<font face="ARIAL">After we place a data byte on the data lines, we must then signal to the LCD
module to read the data. This is done using the <i>Enable</i> line. Data is 
clocked into the LCD module on the high to low transition. The <i>Strobe</i> is
hardware inverted, thus by setting bit 0 of the Control Register
we get a high to low transition on the <i>Strobe</i> line. We then wait for
a delay, and return the line to a high state ready for the next byte.
</font></p>
<p>
<font face="ARIAL">After we initialize the LCD Module, we want to send text to it. Characters
are sent to the LCD's <i>Data Port</i>, thus we want to clear bit 3. Once again
we must only change the one bit, thus we use <tt>outportb(CONTROL, inportb(CONTROL) &amp; 0xF7);</tt>.
Then we set up another <i> for </i> loop to read a byte from the string and
send it to the LCD panel. This is repeated for the length of the string.
</font></p>
<p>
<font face="ARIAL">The delays should be suitable for most machines. If the LCD panel is
not initializing properly, you can try increasing the delays. Likewise
if the panel is skipping characters, e.g. <tt>Tst ,2</tt>. On the other 
hand, If the LCD module is repeating characters e.g. <tt>TTTeessttiinngg</tt>
then you may have a faulting <i>Enable</i> connection. Check your <i>Enable</i> to <i>Strobe</i>
connection.
</font></p>
</ul>
<font face="ARIAL"><br>
<font size="+1">Links to other information</font>
<br></font><hr>
<font face="ARIAL"><br>
</font><ul>
<table>
<tbody><tr><td valign="top">
<font face="ARIAL">
<a href="http://www.iaehv.nl/users/pouweha/lcd.htm">How to control HD44780-based Character-LCD</a></font>
</td><td>
<font face="ARIAL">
Should you want to know more about the LCD Modules, Peer Ouwehand has done
a wonderful job of it or presenting it all. Well worth a look. <br><br>
</font>
</td></tr>
<tr><td valign="top">
<font face="ARIAL">
<a href="http://www.eio.com/lcdintro.htm">LCD Information and Technical Forum</a>
</font>
</td><td>
<font face="ARIAL">
A good web page which includes information on many different types of LCD's.
Also includes a LCD Forum. <br><br>
</font>
</td></tr>

<tr><td valign="top">
<font face="ARIAL">
<a href="http://www.beyondlogic.org/spp/parallel.htm">Interfacing the Parallel Port</a>
</font>
</td><td>
<font face="ARIAL">
Want to know some more details about interfacing your Parallel Port? If so, then try out this Page.<br><br>
</font>
</td></tr>

</tbody></table>
</ul>

</ul></td></tr></tbody></table>
<br><br>
<font size="2">Copyright 1997-2005 <a href="http://www.beyondlogic.org/about.html">Craig Peacock </a> - 15th June 2005.</font>
<br><br>
</center>
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padding: 0px 5px 0px 0px; position: absolute; visibility: inherit; cursor: pointer; background-color: BLUE; color: white; font-family: Verdana,Arial,sans-serif; font-style: normal; font-variant: normal; font-weight: bold; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none; width: 293px; left: 0px; top: 33px;" id="HM_Item4_2">Universal Serial Bus Device Driver Development </div><div style="border-bottom: 1px solid rgb(93, 108, 168); padding: 0px 5px 0px 0px; position: absolute; visibility: inherit; cursor: pointer; background-color: BLUE; color: white; font-family: Verdana,Arial,sans-serif; font-style: normal; font-variant: normal; font-weight: bold; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none; width: 293px; left: 0px; top: 66px;" id="HM_Item4_3">Interrupts and Deferred Procedure Calls on Windows NT4/2000/XP </div><div style="border-bottom: 1px solid rgb(93, 108, 168); padding: 0px 5px 0px 0px; position: absolute; visibility: inherit; cursor: pointer; background-color: BLUE; color: white; font-family: Verdana,Arial,sans-serif; font-style: normal; font-variant: normal; font-weight: bold; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none; width: 293px; left: 0px; top: 99px;" id="HM_Item4_4">USB Driver for the Cypress USB Starter Kit</div><div style="border-bottom: 1px solid rgb(93, 108, 168); padding: 0px 5px 0px 0px; position: absolute; visibility: inherit; cursor: pointer; background-color: BLUE; color: white; font-family: Verdana,Arial,sans-serif; font-style: normal; font-variant: normal; font-weight: bold; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none; width: 293px; left: 0px; top: 132px;" id="HM_Item4_5">Device Driver Fiddler (tools)</div><div style="border-bottom: 1px solid rgb(93, 108, 168); padding: 0px 5px 0px 0px; position: absolute; visibility: inherit; cursor: pointer; background-color: BLUE; color: white; font-family: Verdana,Arial,sans-serif; font-style: normal; font-variant: normal; font-weight: bold; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none; width: 293px; left: 0px; top: 149px;" id="HM_Item4_6">Windows NT Device Driver Installer (tools)</div><div style="border-bottom: 1px solid rgb(93, 108, 168); padding: 0px 5px 0px 0px; position: absolute; visibility: inherit; cursor: pointer; background-color: BLUE; color: white; font-family: Verdana,Arial,sans-serif; font-style: normal; font-variant: normal; font-weight: bold; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none; width: 293px; left: 0px; top: 182px;" id="HM_Item4_7">Device Driver Remover Win9x (tools)</div><div style="padding: 0px 5px 0px 0px; position: absolute; visibility: inherit; background-color: BLUE; color: white; font-family: Verdana,Arial,sans-serif; font-style: normal; font-variant: normal; font-weight: bold; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none; width: 293px; left: 0px; top: 199px;" id="HM_Item4_8"><img style="position: relative; margin-top: 2px; margin-right: -5px; float: right;" src="ACD1_files/HM_More_white_right.gif" vspace="0" width="5" hspace="0">Links</div></div><div style="border: 1px solid rgb(93, 108, 168); overflow: hidden; position: absolute; visibility: hidden; left: -500px; top: 0px; width: 298px; cursor: default; height: 415px;" id="HM_Menu5"><div style="border-bottom: 1px solid rgb(93, 108, 168); padding: 0px 5px 0px 0px; position: absolute; visibility: inherit; cursor: pointer; background-color: BLUE; color: white; font-family: Verdana,Arial,sans-serif; font-style: normal; font-variant: normal; font-weight: bold; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none; width: 293px; left: 0px; top: 0px;" id="HM_Item5_1">CMOS Digital Image Sensors and Lenses</div><div style="border-bottom: 1px solid rgb(93, 108, 168); padding: 0px 5px 0px 0px; position: absolute; visibility: inherit; cursor: pointer; background-color: BLUE; color: white; font-family: Verdana,Arial,sans-serif; font-style: normal; font-variant: normal; font-weight: bold; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none; width: 293px; left: 0px; top: 17px;" id="HM_Item5_2">Generate Ring Tones on your PIC16F87x Microcontroller</div><div style="border-bottom: 1px solid rgb(93, 108, 168); padding: 0px 5px 0px 0px; position: absolute; visibility: inherit; cursor: pointer; background-color: BLUE; color: white; font-family: Verdana,Arial,sans-serif; font-style: normal; font-variant: normal; font-weight: bold; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none; width: 293px; left: 0px; top: 50px;" id="HM_Item5_3">Interfacing the AT Keyboard</div><div style="border-bottom: 1px solid rgb(93, 108, 168); padding: 0px 5px 0px 0px; position: absolute; visibility: inherit; cursor: pointer; background-color: BLUE; color: white; font-family: Verdana,Arial,sans-serif; font-style: normal; font-variant: normal; font-weight: bold; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none; width: 293px; left: 0px; top: 67px;" id="HM_Item5_4">How does the Microchip ICD Work?</div><div style="border-bottom: 1px solid rgb(93, 108, 168); padding: 0px 5px 0px 0px; position: absolute; visibility: inherit; cursor: pointer; background-color: BLUE; color: white; font-family: Verdana,Arial,sans-serif; font-style: normal; font-variant: normal; font-weight: bold; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none; width: 293px; left: 0px; top: 84px;" id="HM_Item5_5">Trust-No-Exe</div><div style="border-bottom: 1px solid rgb(93, 108, 168); padding: 0px 5px 0px 0px; position: absolute; visibility: inherit; cursor: pointer; background-color: BLUE; color: white; font-family: Verdana,Arial,sans-serif; font-style: normal; font-variant: normal; font-weight: bold; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none; width: 293px; left: 0px; top: 101px;" id="HM_Item5_6">Command Line Process Viewer/Killer/Suspender for Windows NT/2000/XP</div><div style="border-bottom: 1px solid rgb(93, 108, 168); padding: 0px 5px 0px 0px; position: absolute; visibility: inherit; cursor: pointer; background-color: BLUE; color: white; font-family: Verdana,Arial,sans-serif; font-style: normal; font-variant: normal; font-weight: bold; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none; width: 293px; left: 0px; top: 134px;" id="HM_Item5_7">BeyondExec - Spawn Processes on Remote Windows NT/2000/XP WorkStations</div><div style="border-bottom: 1px solid rgb(93, 108, 168); padding: 0px 5px 0px 0px; position: absolute; visibility: inherit; cursor: pointer; background-color: BLUE; color: white; font-family: Verdana,Arial,sans-serif; font-style: normal; font-variant: normal; font-weight: bold; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none; width: 293px; left: 0px; top: 183px;" id="HM_Item5_8">Beyond Logic Shutdown Utility for NT/2000/XP</div><div style="border-bottom: 1px solid rgb(93, 108, 168); padding: 0px 5px 0px 0px; position: absolute; visibility: inherit; cursor: pointer; background-color: BLUE; color: white; font-family: Verdana,Arial,sans-serif; font-style: normal; font-variant: normal; font-weight: bold; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none; width: 293px; left: 0px; top: 216px;" id="HM_Item5_9">Bmail - Command Line SMTP Mailer for Batch Jobs</div><div style="border-bottom: 1px solid rgb(93, 108, 168); padding: 0px 5px 0px 0px; position: absolute; visibility: inherit; cursor: pointer; background-color: BLUE; color: white; font-family: Verdana,Arial,sans-serif; 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font-variant: normal; font-weight: bold; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none; width: 293px; left: 0px; top: 315px;" id="HM_Item5_12">Console Computer Information Utility for 2000/XP</div><div style="border-bottom: 1px solid rgb(93, 108, 168); padding: 0px 5px 0px 0px; position: absolute; visibility: inherit; cursor: pointer; background-color: BLUE; color: white; font-family: Verdana,Arial,sans-serif; font-style: normal; font-variant: normal; font-weight: bold; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none; width: 293px; left: 0px; top: 348px;" id="HM_Item5_13">SMART &amp; Simple for NT/2000/XP</div><div style="border-bottom: 1px solid rgb(93, 108, 168); padding: 0px 5px 0px 0px; position: absolute; visibility: inherit; cursor: pointer; background-color: BLUE; color: white; font-family: Verdana,Arial,sans-serif; font-style: normal; font-variant: normal; font-weight: bold; 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