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IWR6843ISK-ODS: Ends with an error when changing parameters

user6007590
Prodigy 20 points
Part Number: IWR6843ISK-ODS
Hi Technical Support
In the following demo, We replaced the cfg file with an attachment.
 \ti\mmwave_industrial_toolbox_3_3_1\labs\lab0020_pplcount_Overhead\GUI_A_base_no_logic
If we run main_pplcount_viz.exe with this, something on the way up We get an error and quit.
Please tell me the cause.Are we in conflict with parameter limits?mmw_pplcount_demo_change.cfg 
  • 0
    TI__Mastermind 28055 points

    Hi,

    How did you come up with the Frame CFG line? Two things to check:

    1. How much time is required to finish the frame? This is time per chirp (idle + chirp time)*<number of chirps in a frame (3)>*number of chirp loops (255)
      1. Please set 255 to 256, as the demo requires this value be a power of 2
      2. This must be less than the frame periodicity
    2. How much data is required to store all of the chirp samples?
      1. <4 bytes per sample>*<num Rx>*<num Tx>*<num samples per chirp>*<number of chirp loops>
      2. Must be less than 768 KB

    Regards,

    Justin

  • 0 in reply to Justin Curewitz
    Prodigy 20 points
    Dear Justin

    Thank you for the quick response.

    Please tell me two points.

    The number of chirps per frame is set to 255 → 256.
    On the other hand, the argument of “frameCfg” on page 17 in the following document is “number of loops (1 to 255)”.
    　C:\ti\mmwave_sdk_03_01_01_02\docs\mmwave_sdk_user_guide.pdf
    Is the document wrong?

    Also, what is the limitation of the upper limit of “768 KB” for chirp samples?
    Is it possible to increase it?

    Best Regards.
  • 0 in reply to user6007590
    TI__Mastermind 28055 points
    Hi,

    I seem to have made an error regarding the number of chirp loops. 255 is the upper limit - this does not need to be a multiple of 2.

    Currently, 768 KB is the upper limit. It cannot be increased. If you tell me the goals of your chirp design, I may be able to help you find a solution that requires less data.

    Regards,
    Justin