128x64 GLCD odd behavior

[sapy44]

Hello All,

I've been working with a KS0108 based GLCD. In the past I've been able to work with this GLCD with no issues, but recently I've fired it back up and found some odd behavior.

I can fill the screen with glcd_fill() function so I know that the individual pixels and memory locations are ok. However when I try to draw shapes like lines, rectangles, circles, etc. I get some random pixel errors.

When I single step through the code I can see that some pixels are being set ok, but when subsequent pixels are set, some of the previously set pixels are cleared.

I have a feeling that when the glcd_pixel() function reads back the memory location contents it is corrupting the data. Then when the glcd_write() function is called to set the individual pixel, it is upsetting the previously drawn pixels.

Please excuse the fact that I did not post any code, but I am just using the included driver glcd.c

Has anyone ever encountered this sort of behavior before ? If so, any suggestions on how to fix the problem ?

[PCM programmer]

What's your CCS compiler version ?

Also, what's your PIC ?

[MikeP]

Please read and apply the fixes in this post if you are using the SED1335.c driver.

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

[sapy44]

Compiler version 4.066

PICs used are 18F4685 and 18F4620


using the standard GLCD driver from CCS