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IWR6843ISK: External Trigger

Larry Koudele
Intellectual 310 points
Part Number: IWR6843ISK

Tool/software:

I have a IWR6843ISK along with DCA1000 and Boost board.  I need to do an external hardware trigger.  I have put in the required resistor on the boost board and hooked up a pulse generator (single shot) for the trigger into the J5 -9 on the boost board.  I used mmWave Studio for the setup .  I can get the board to trigger, but the internal matlab analysis firmware gives an error so I can't retrieve any data.  It says the number of expected data points is slightly lower than expected.  No matter what I have tried so far, this is always the case.   The actual number is given in the errors I see.  I can just switch over to firmware trigger, and it works fine.  Back to hardware trigger, same error.  Please help! 

/Larry 

  • 0
    TI__Mastermind 23347 points

    Hello Larry,

    Do you see the same behavior when using the DCA1000 ADC Capture Tool as well? It uses different protocols and is overall easier to work with from a developer's stand point.

    Best Regards,

    Pedrhom

  • 0 in reply to Pedrhom Nafisi
    Intellectual 310 points

    Pedrhom,

    I have not tried using just the DCA1000 and 6843ISK with external trigger.  Right now, I have all three (6843ISK, DCA1000, and Boost board) hooked together.  I have used the IWR6843ISK and DCA1000 alone together before, but I used exactly the same mmWave Studio software program.  I have been using Matlab to analyze the files, and they are the same (two boards vs the three boards).  In this failing mode, it does send out a binary file after hitting the PostProc button, but gives an internal Matlab error.  For what I am doing right now, it says each receive antenna is short 64 bytes of what it should be.  Ideas?

  • 0 in reply to Larry Koudele
    Intellectual 310 points

    I have now found out that the external trigger only does one(1) frame no matter how it is setup.  If I use some of the mmWave Studio default settings, it will do the correct number of chirps, but still only one frame.  That is ok with me.  If I setup my own parameters, it seems to drop some data on the last antenna of the last chirp.   I think that is not always going to be the case.  For now, I am ok........  Thanks!