GLCD problem - See Photo

[jahan]

Hi,
I've compile the code for ex_glcd.c from example codes and loaded to 18F452.
It does work fine and shows the reading from RA0, except the 0,0 location of the screen is shifted to middle and wrapped around.

for example the "WARNING" and the bar shows as follow:


Any suggestion?

[specialk]

Looks like your chip select lines are reversed. Try changing CS1 and CS2 either in software or by swaping the lines physically.

-special [k]

[jahan]

thankx for the help. I'll try it today.
my thoughts was that there is something wrong with memory location to start writing information. Just like a 24x2 line regular lcd where the second line has a specific address that program points to and write the data.
what are the CS1 and CS2 lines anyway?

-JJ

[Ttelmah]

They select the two 'halves' of the memory. Hence if reversed will give the sort o behaviour you are seeing.

Best Wishes

[jahan]

It is working great!.
Thankx

[Homie]

CS1 and CS2 is chip select 1 and 2. My guess is that your display is a 128x64bit display. And every chip can handle 8 rows at 8bits =64bits, therefore you need 2 chips to cover the whole display.

-Thomas