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Interface LCD module using SPI in Linux

shinu varghese1
Prodigy 20 points
Other Parts Discussed in Thread: AM3354

Hi,

I want to interface NT75451 lcd controller using SPI interface to am3354 based custom board.

Can somebody please suggest me the documents or device driver examples for Interfacing LCD module using SPI in Linux to refer.

I would highly appreciate any help in this regard. :)

Thanks

  • 0
    TI__Guru**** 393215 points

    Doesn't your LCD have a parallel data bus? You can interface it using the LIDD mode of the AM335X LCD controller. If you need to use SPI you will probably have to write your own driver. I haven't seen any examples of serial interface to LCD on this processor.

  • 0 in reply to Biser Gatchev-XID
    Prodigy 20 points

    Hi Biser,


    Thanks for your reply.

    We are using SPI interface. I will try to do that.

    Thanks

  • 0
    Prodigy 125 points

    I would implement a Linux framebuffer (FB) driver that exposes the framebuffer to any application and implement the SPI protocol of the controller on the other end using kernel's SPI interface to talk to it.

    May have to do some data mangling due to pixel data differences between FB and the controller but at that kind of resolution that shouldn't be a problem.

    If the LCD is only used by one application you could go with SPIDEV approach and implement the driver in userspace, that way you could form your drawing routines optimally to the controller and wouldn't need to try to fit them to what the FB layer offers.

    The upside of using the FB interface is of course that pretty much any application can use the display.

  • 0
    Prodigy 85 points

    Hi

    Have you got any best workaround for the issue. I like to interface ePaper display with Beagle bone black through SPI interface.

    regards,

    Venkat