Display showing split screen, I dont want it to.

TC

Hello All,
I am having problems with Crystalfontz “CFAG240128D-TMI-TZ”. Now I know it is an old display, but this is the first time I was able to use it.

The display uses A Sanyo LC7891 controller, and it is 240x128

My problem is, in character mode, I am getting (2) 40char X 8lines, it should be (1) 40char X 16lines. Whatever I load to the display, it is copied 8 lines down. It is like I have two screens, one on top of the other both 8 lines tall.

I have included the code that I am working with, it is messy, but I plan to make it better later on. Right now I am just trying to get the display to work right.

I can’t find anything on the datasheet about this, Please help me figure out what is going on.

I hope this makes sense.
Thanks
TC

kuroneko

Display duty (insn %00000011) is set to 64. With 128 vertical lines this looks more like a configuration issue in that the screen display simply repeats. Try setting it to 128.

TC

That did it!!! Thank you very much. I only used that value, because the Crystalfontz datasheet said on page 13 "please set Nx=64" I thought it was wrong, but I did what they said.