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RMcIn
Associate
September 24, 2018
Question

Using STM32F469i Discovery Board in Minimal Display Resource Mode

  • September 24, 2018
  • 3 replies
  • 815 views

I am developing on the STM32F469i  Discovery Board for a design that will have no DRAM.

I need to write to the display using minimal SRAM or, better yet, write directly to the display controller. Is it possible to write bytes directly to the board or to define a small "scratchpad" SRAM area and sequentially write sections of the display without losing previously written segments? Is there an example project showing how this might be done?

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    3 replies

    Tesla DeLorean
    Guru
    September 24, 2018

    Does the display's controller indicate that's a viable method? Normally paints from a rather large frame buffer via DSI, as I recall.

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    Tesla DeLorean
    Guru
    September 24, 2018

    https://www.st.com/content/ccc/resource/technical/document/application_note/group0/25/ca/f9/b4/ae/fc/4e/1e/DM00287603/files/DM00287603.pdf/jcr:content/translations/en.DM00287603.pdf

    The controller looks to have it's own memory, I think you can write commands/data over the DSI link. Review how the BSP code configures the registers.

    http://orientdisplay.com/pdf/OTM8009A.pdf

    The display/touch part# is KM-040TMP-02-A

    The demos I think take a minimum of 768KB

    This is the display on the F746

    https://cache.nxp.com/docs/en/supporting-information/RK043FN02H-CT.pdf

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    RMcIn
    RMcInAuthor
    Associate
    September 25, 2018

    Thanks.

    I will take a look.