HG25504, 256 x 128 GLCD with SED1330 controller problem

Sergeant82d · Joined: 01 Nov 2009 Posts: 55 Location: Central Oklahoma

There I go again.... leaving out important information...

In my continuing efforts to get this thing working, I changed boards! I moved over to my Inex NX-877 Plus II board, which uses a 20MHz crystal.

OTOH, I tried it with the EasyPIC3 and 8 MHz, with less success, but still better than the past two days.

I thought the long jumpers I had initially may have changed the timing enough to affect performance, so I moved to the other board which has built in sockets instead of male pin headers. This allows me to use 4" wires instead of 18".

To continue (finally!), I have been trying out different shapes from the graphics library, text effects, etc., with consistent results:

Every 8th column is not displaying, EXCEPT where that column intersects a displaying item, it will kind of "drag" along, smearing for 2-3 pixels from the displaying line. Think of spikes on a scope trace.

Also, on strictly vertical lines, there is a parallel line 6 columns to the left, flashing and appearing to scroll downward.

Thanks for your time!

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

Do you have the same problem as shown in this thread ?
http://www.ccsinfo.com/forum/viewtopic.php?t=34970
See the screenshot about 2/3'rds of the way down the thread of
a filled circle with lines in it.

Also, verify that your version of the SED1335.c driver doesn't have
the bug described in this post:
http://www.ccsinfo.com/forum/viewtopic.php?t=34970&start=15
That bug was fixed by CCS right around version 4.088 or 4.089.

Make sure you fix it, if your version has the bug.

Sergeant82d · Joined: 01 Nov 2009 Posts: 55 Location: Central Oklahoma

Yes, that is the same problem I am having. Looking over that thread (again), I added "L" at the end of the numbers, thinking I have read that would force them up from char to int. Is that correct? However, it has no effect on the display.

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

It seems like a lot of people have trouble making the SED1335.c driver
work. I'm curious about that, so I ordered one of these lcds. I should
get it later in the week. I'll work on it some more at that time.

Sergeant82d · Joined: 01 Nov 2009 Posts: 55 Location: Central Oklahoma

I would be happy to pay for that LCD - I have seen a great many of your very helpful posts as I have been searching the archives and reading back posts.

PM me if you're interested.

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

No. If a number of people have trouble with something, it becomes
sort of a "challenge". It becomes fun to solve it.

MikeP · Joined: 07 Sep 2003 Posts: 49

I have this GLCD working.

Please check to make sure your driver file has this fix for the getData() function this post.

http://www.ccsinfo.com/forum/viewtopic.php?t=21096

Sergeant · Joined: 14 Nov 2007 Posts: 1 Location: NC

I'll try it as soon as I get home from my day job... I'll let you know how it works out.

Sergeant82d · Joined: 01 Nov 2009 Posts: 55 Location: Central Oklahoma

Whooo Hoooo!!!

That did it - changing the low to high in "GetData" and "GetCursorAddress" cleared it up!

Thanks very much - It would have taken me a long time (okay, probably NEVER) to figure that out. I sure wish I'd found that old post in my searches here and other places online!

Now to fiddle with timing to minimize the flickering look...

Thanks again!
Brad

Sergeant82d · Joined: 01 Nov 2009 Posts: 55 Location: Central Oklahoma

The flickering was a result of the constant re-drawing in a while(1) loop... commenting that out and I have nice, dark, non-flickering graphics!

Thanks very much for your help, MikeP! And to you too, PCM_Programmer! This place rocks!

Brad

P.S. - I added a post to the code library forum with all this info rolled up - hopefully it will make it easier for others in the future to get this driver going.

MikeP · Joined: 07 Sep 2003 Posts: 49

Yes it should be fixed by CCS. Every time I update it overwrites the driver with the bugs in it.

I pulled my hair out for days when i first started trying to use the sed1335.c driver.

I have been play with this GLCD for a few weeks now.

Here is some code I wrote to draw a bitmap.

The int8 rom sections are made with a perl program that i also wrote that reads a bmp format file and outputs an array ready to be pasted into the C program.