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IWR6843ISK: how to define and synchonise timestamps with host to output it in frame

Romain DEBORDE
Prodigy 20 points
Part Number: IWR6843ISK
Other Parts Discussed in Thread: IWR6843

Hi,

 

We are currently working with the IWR6843 sensor. We want to output a timestamp (synced with a computer) in the header part of the TLV outputFrame..

We've found different options to do this in the forum, however they are imprecise and do not include code examples. Could you please let us know what the best option is in terms of desgin and simplicity ?

Do you have a code sample or design principles that you could provide us to achieve that?

 

Thanks for your help.

 

Regards,

RD

  • 0
    TI__Mastermind 37805 points

    Hi RD,

    Chirps should happen on a defined interval (once every X ms) which is set in the frameCfg. Is that not precise enough? 

    Best,

    Nate

  • 0 in reply to Nathan Block
    Prodigy 20 points

    Hi Nate,

    Thank you very much for your answer. 

    We had thought about this type of solution. I implemented it this week and we tested it. i have 2 related questions :
    1 - We saw in the test that we had a gap between the start time and the first frame and we do not have a clear idea of this gap. Is there a way to get this discrepancy from an internal clock? Can this gap change depending on the configurations?

    2 - Is the frame always accurate in relation to the configured period or are there small deviations?

    Best,

    Romain

  • 0 in reply to Romain DEBORDE
    TI__Mastermind 37805 points

    Hi Romain,

    Romain DEBORDE said:

    1 - We saw in the test that we had a gap between the start time and the first frame and we do not have a clear idea of this gap. Is there a way to get this discrepancy from an internal clock? Can this gap change depending on the configurations?

    This gap could change based off the configuration if there is more/less setup for the chirping configuration.

    Romain DEBORDE said:
    2 - Is the frame always accurate in relation to the configured period or are there small deviations?

    There may be small deviations.

    What level of accuracy are you looking for here? You might also configure a GPIO to trigger upon the frame start interrupt.

    Best,

    Nate