Interested in LCD interface code?

Paul Baker

My new project is interfacing the SX to a 128Kx8 SRAM (only 64K will be used) and a 640x400 monochrome LCD. I chose a 640x400 instead of 640x480 because the 400 data frame·is exactly 32K whereas the 480 results in an akward number and I will be double buffering. But timing diagrams and data organization are similar so my code will be adaptable to comperable 640x480 screens. Program space will contain CGROM data and data to be displayed will likely be imported via RS232. Barring any snafu's I anticipate completing it in a few months, anyone interested in the final code and schematics?

Paul

PJMonty

Paul,

I'm sure that when you get it done, the schematic and code will definitely be of interest to the members of this forum.

Thanks,
PeterM

KenM

Yes, also James at sxlist.com would like a copy/

Paul Baker said...
My new project is interfacing the SX to a 128Kx8 SRAM (only 64K will be used) and a 640x400 monochrome LCD. I chose a 640x400 instead of 640x480 because the 400 data frame·is exactly 32K whereas the 480 results in an akward number and I will be double buffering. But timing diagrams and data organization are similar so my code will be adaptable to comperable 640x480 screens. Program space will contain CGROM data and data to be displayed will likely be imported via RS232. Barring any snafu's I anticipate completing it in a few months, anyone interested in the final code and schematics?

Paul

Gsparis

Hi Paul,

I know it's been 3 years now but I am indeed interested in your code and schematics to control a 640x400 graphic LCD with an SX.

If you still have the files can you share them ?


Thanks,


Gilles

RickB

I too would like to see it. Did it not work out?

Rick

Bean

I'd say that a Propeller would be more better choice.
Mainly because of the RAM requirements. The SX would require an external RAM chip.

Bean.

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Gsparis

Well, I would say that this is where the challenge is !

I just started to get acquainted with the SX so for now I'd like to stick with it.

Bean, do you know how far Paul went in this project with the SX ?


Gilles

Bean

Gilles,
No I don't. Hopefully Paul will chime in here and bring us up to date.

It CAN be done. I worked on a color video module using the SX48. 256x192x16 colors. Had it working too. But never finished it.
Here is a link to the thread if anyone is interested http://forums.parallax.com/showthread.php?p=603796

Bean.

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Post Edited (Bean (Hitt Consulting)) : 7/11/2007 5:34:58 PM GMT

Gsparis

Hope he will !
Actually, I would like to know how Paul managed the LCD power supplies (+5v and Vee) as I know negative power supply should only be applied after the Vcc.

By the way Bean, too bad you didn't finished your color project. It seemed quite interesting !
Actually, I bought the XGS ME a year ago and I learned a bit of ASM and the NTSC and PAL signal generation on it.
I wish the SRAM management be more "classic"...

Gilles

RickB

Hey, hey, hey Paul!

Was the project successful? Inquiring minds in limbo land want to know.
If the SX can't do it I'm sure an AVR can. (that should wake him up)

RickB

BOINK!

So.... Was the SX not fast enough? Say it ain't so Paul.