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TDA2PXEVM: Swap HDMI_PHY TX polarity through memory mapped register

Norman S.
Intellectual 690 points
Part Number: TDA2PXEVM


Our custom board have swapped the polarity of the HDMI_PHY clock and data pads to the HDMI port interface.
Is it possible to swap the polarity of the HDMI_PHY pads through registers?

I have searched the data sheet and cannot find the appropriate register.

Searching through the source code of PDK shows that it is possible through:

    /* Swaps HDMI output polarity */
    UInt32* HDMI_PHY_PAD_CONFIG_CONTROL = (UInt32*) 0x5804030C;
    *HDMI_PHY_PAD_CONFIG_CONTROL |= 0x78000000;

However, doing the above does not seem to work.

With this may I ask information/technical reference if swapping of HDMI_PHY pads polarity is possible through register access?

  • 0
    TI__Expert 6065 points
    Hi,

    Do you have to change the polarity of the clock also?
    If so, can you try to do it from the driver by changing as below
    in file <pdk_install_dir>\packages\ti\drv\vps\src\vpslib\hal\src\vpshal_dssHdmi.c
    in function vpshal_HdmiPhyPowerOn
    set field HDMI_PAD_CONFIG_CONTROL_FLIP_P_N_ORDER_CLK to 0.

    To change the polarity of the data lanes you can call the dctrl ioctl IOCTL_VPS_DCTRL_HDMI_FLIP_DATA_P_N_ORDER from application.
    But for testing you may call the function vpsDrvDctrlHdmiFlipDataPnOrder(), at the end of vpshal_HdmiPhyPowerOn() mentioned above.

    Can you try these and update?

    Regards,
    Prasad
  • 0 in reply to Prasad Konnur
    Intellectual 690 points

    Hello Prasad,

    The revisions you mentioned above resolved my inquiries.

    Thank you for the great support.