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IWR6843: CUFF LVDS Example

John Kablan
Prodigy 90 points
Part Number: IWR6843
Other Parts Discussed in Thread: , IWR1642

Hi,

I'm trying to stream data out of the IWR8643 using the LVDS interface to the DCA1000. I would like to start with raw ADC samples and eventually move to processed/custom data. I plan to use the API provided in C:\ti\mmwave_studio_02_00_00_02\mmWaveStudio\Clients\AR1xController\RF_API.dll to control the DCA1000 however I'm having difficulty getting data out via the CBUFF interface.

I noticed that he multi_gesture_68xx lab contains code for streaming data out of the lvds interface so I loaded it onto the IWR6843ISK. The data produced by the gesture lab is custom data rather than raw ADC data but it thought it would be a good place to start.

After programming the mss, dss, and connecting to the uart port, I issue the following command " lvdsStreamCfg 0 0 1 1 ". The radar responds almost immediately with "DSS Frame Processing Deadline Miss Exception." This leads me to believe that this functionality was never intended to be used with this demo. Note I do not issue any other configuration commands to the radar since the user guide for the lab states " … the gesture demo firmware auto-configures the sensor with pre-programmed chirp configuration at startup"

 Is there example firmware demonstrating setup of the CBUFF to stream raw adc data and/or custom data for the IWR6843 that is known to work?

Thanks

  • 0
    TI__Mastermind 25825 points
    Hello,

    Gesture demo is not intended to be used with the LVDS stream capture application.
    Currently supported configuration for the LVDS capture is through the mmWave studio.
    At this point in time, Unfortunately, there are no firmware available for demonstrating the custom data for IWR6843.

    For the Data-path architecture there is app-note written for the AWR16xx it would be similar for 68xx family of devices.
    This also provides the frame-work for the getting the custom/processed data over LVDS interface.
    www.ti.com/.../swra555.pdf

    Also review below application note
    www.ti.com/.../swra581b.pdf
    This application report demonstrates how to interpret raw analog-to-digital converter (ADC) data that is captured using the Capture Demo or Mmwave Studio.

    Were you able to capture the RAW ADC data using DCA1000 using mmWave studio?

    Thanks and regards,
    CHETHAN KUMAR Y.B.
  • 0 in reply to CHETHAN KUMAR Y.B.
    Prodigy 90 points
    Thank you for your reply. I have not collected raw data with the IWR6834 and the DCA1000 however I have done this with IWR1642 and I found the process did not suit my needs.

    I will review the data path architecture note and proceed from there.

    Regards,

    John