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WinEC 7 AM35x lcd driver rotation problem

Andreas Geisreiter
Intellectual 380 points

Hello,

I'm using the Adeneo BSP for TI AM35x. The LCD driver supports screen rotation via setting [HKEY_LOCAL_MACHINE\System\GDI\Drivers] "Angle" to 1 for 90°.

It works, but the screen is flickering and I get the debug message:

DSS pipeline underflow error.Intrstatus:40

In the *.reg file I found the following note: Rotation should not be used with the flat frame buffer, memory/bus bandwidth may be exceeded by display scanning requirements causing display to flicker and/or lock up.

What means flat frame buffer?

Does anybody have experience with rotate AM35x screen?

Best regards,

Andreas

  • 0
    Mastermind 9310 points

    Hello Andreas,

    Can you give a bit more information on your setup and any modifications you've made to the BSP. A few specific questions are:

    1) What display are you using?

    2) What modifications have you made to the display driver beyond changing "Angle" from 0 to 1,2 or 3?

    3) Do you have VRFB driver catalog item checked in the Catalog Items View?

    As for the flat frame buffer, this refers to the VGA Linear (Flat) Framebuffer. This is available to be enabled in the Catalog Items View, however, it should be disabled by default and grayed out (you should not  be able to enable it).

    Regards,