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TDA4VM: CSI Data Lanes Swap

David Costa
Prodigy 135 points
Part Number: TDA4VM

Hello,

We are currently using TDA4VM processor and would like to swap the data lanes arriving from the camera. 

1- Is it possible to do so? (For example, by changing iss_sensor.c's variable named: dataLanesMap?)

2- Suppose our camera Lane 1 is routed to TDA4VM's Lane 3, should our dataLanesMap variable be: {3, 2, 1, 4}?

3- Is there anything else we should do?

Best regards,

  • 0
    TI__Guru**** 477225 points

    Hi David,

    Do you mean to map the data lanes differently? Yes, this is supported, but not verified, you could use DataLanesMap variable to map lane differently. 

    Regards,

    Brijesh

  • 0 in reply to Brijesh Jadav
    Prodigy 60 points

    Hi Brijesh,

    in the TDA4 TRM (SPRUIL1B - DEC2020) there is a register named  CSI_RX_IF_VBUS2APB_STATIC_CFG (page 16530) with some fields that seems used for that purpose. 

    The fields are named DL0_MAP, DL1_MAP, DL2_MAP and DL3_MAP.

    What are the possible values of these fields?

    They can configure the physical pin connected to a particular data lane?

    Best Regards.

  • 0 in reply to Alessandro Spinetti
    TI__Guru**** 477225 points

    Hi ,

    Yes, but i would recommend using driver interface to change the lane ordering, instead of directly updating these register. PDK driver/OpenVX node provides the way to change lane order, in the variable array instCfg.dataLanesMap, you could provide the position of the lane0 (instCfg.dataLanesMap[0]), position of the lane1 (instCfg.dataLanesMap[1]) and so on..

    Regards,

    Brijesh