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How To : Step by step Access HDMI

Tony Blank
Prodigy 40 points
Other Parts Discussed in Thread: 4460

Hi Everyone,

I have read HDMI figure in OMAP 4460 ES.1 TRM document.
But I didn't know how to access this module. I want to build my own module with programming models.
What is step to access the HDMI module in OMAP 4460?

I ever read this site and found many information.
But what is the relation between DISPC, HDCP, HDMI, PLL, PHY?
how can i write a character on monitor with HDMI ?

Thank you,

Tony

  • 0
    TI__Genius 10965 points

    Hi Tony,

    Running HDMI without operating system is a hard task. So it is better to use some linux/android kernel in order to run it.

    There are examples for initializing and controlling the HDMI with u-boot but i cannot guarantee they are all verified and easy to implement.

    Regards,

    Boyko

  • 0 in reply to Boyko Kazakov
    Prodigy 40 points

    Hi Mr. Boyko,

    I did like to build hdmi module with my own bare metal programming.
    But I didn't know how HDMI module OMAP4460 works.
    I used Panda Board as my board and read that reference.

    I also have read these link below, but it's hard to me understand :( :


    https://gitorious.org/pandroid/kernel-omap/source/a15c2475f9cfdacce5973bc778973e8f0abbc50c:drivers/video/omap2/dss/hdmi.c#L26-30


    http://lxr.free-electrons.com/source/sound/soc/omap/omap-hdmi.c

    Greetings Regards,

    Tony Blank

  • 0 in reply to Tony Blank
    TI__Genius 10965 points

    Hi Tony,

    You are trying to achieve not an easy task.

    I can suggest to start using the Clock tree tool for omap4 just to start initializing the required blocks. Then connection between the display module the ram and the hdmi interface will be your next milestone. 

    If you understand how linux drivers work it will be easy for you to port the required code from some kernel, otherwise you better start reading  the free-electrons materials.

    Regards,

    Boyko

  • 0 in reply to Boyko Kazakov
    Prodigy 40 points

    Hi Mr. Boyko,

    It helps me, but i only find DSS domain clocks module where HDMI is inside DSS module.

    And the first time i must do is activated DSS domain clocks with PRCM?

    Sir, would you like give me a link the free electrons materials?

    Thanks Before,
    Regards,

    Tony Blank

  • 0 in reply to Tony Blank
    TI__Genius 10965 points

    Hi,

    You better start with: http://free-electrons.com/training/kernel/

    You must know that full documentation for the HDMI is under NDA because of security features. You have to get in contact with your nearest TI representative  in order to get that documentation.

    Regards,

    Boyko