LCD interfacing with the de1 board

Use the Optrex manual as a reference:

http://www.optrex.com/pdfs/dmcman_full.pdf

Lumex and Crytalfontz are the parts used by Terasic/Altera. These parts are compatible with the timing in the Optrex guide.

warnings:

1) There are several pinouts for LCD modules, with some, the only difference is that the 5V and GND pins are swapped. So make sure you know which pins are which before you power the LCD. Try finding the part number on your module, eg., Lumex LCM-1602DSR/F-Y, and then go find the data sheet.

2) Do not interface to a non-5V compliant FPGA/CPLD directly. The LCD modules can drive the output bus to 5V for read accesses (this depends on the module and its configuration).

Cheers,

Dave

Thanks Dave,

I got a program from edaboard and i was working on that. The program is compatible with the data sheet that you suggested.

As I download the .sof file the lcd display is fully fllled in a row. Please see the screenshots .

http://2.bp.blogspot.com/-LY9gpOSyGFo/TacrWalpxtI/AAAAAAAAAXg/GLD8xrbU3Vw/s1600/P4130032.JPG

Can any one find the problem? I tried changing the width for enable pulse. It is about 460ns now.

What is the normal pulse width required?

http://3.bp.blogspot.com/-nHRvpEu6D6U/TacrVju1LMI/AAAAAAAAAXc/aVh1Th0q--s/s1600/lcd+waveform.png

Its supposed to look like that when you turn the power on.

You now need to initialize the controller. The Optrex manual has the procedure.

Cheers,

Dave

:)ya..its working the "8 - Bit Initialization" diagram was in the pdf u gave...

I didn't gave correct delays but still its working.. just need to adjust the background color intensity.

Thanks

Kiran

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Hi Kiranjose!

My apologies. Here are the data sheets for the LCD module that we sent to you. ;)

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:) thanks Allen