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AM1806 LCD Frame sync problem when MMU on

wei wang9
Prodigy 20 points

I got a frame sync error when enable MMU.

The program is running on internal-ram (0x80000000). It has no problem if the MMU pageEntry[0x800]'s "C" bit is cleared.

But when set the "C" bit of the pageEntry[0x800], and then do some operations on framebuffer , the LCD get frame sync error(the graphic is miss aligned).

The LCDC was configured as RASTER_SINGLE_FRAME_BUFFER.

  • 0
    TI__Mastermind 20790 points

    Wei,

    Welcome to E2E. Will you give some more details?
    1. Are you working on which TI board or own custom board?
    2. Are you using TI provided software or own code?

  • 0 in reply to Pubesh
    Prodigy 20 points

    I am working on custom board;

    I am using starterware as refrence.

    Now I resolved this problem by :

     enable caching on frambuffer section;

     set LCD's master priority to '2' (default is 5);

    reduce the frame refresh rate.

    I just did that by reading datasheet and trying, but didn't find right solution for the problem. It seems work. I don't know if what I did is appropriate. 

    Thank you for help.

  • 0 in reply to wei wang9
    TI__Mastermind 20790 points

    Wei,

    Thanks for your response. It seems good progress on your side.
    If it is working, you can verify this thread.
    So that someone will get this kind issue, it will be help to them.