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Original question:

dataOutputFromEVM data Structure !

IWR6843ISK-ODS: Data Format of dataOutputFromEVM.bin of Output Data of VitalSigns Demo

Alexander Groeschel
Prodigy 100 points
Part Number: IWR6843ISK-ODS
Other Parts Discussed in Thread: MMWAVEICBOOST,

Hello,

I am using a IWR6843ISK-ODS + MMWAVEICBOOST EVM. I flashed the Vital-Signs-Lab of the mmwave_industrial_toolbox_4_4_1 on the sensor and ran the demo as described in the lab user guide.

The Lab GUI includes a checkbox "save data". In my understanding the data of the session is written to the file dataOutputFromEVM.bin in the present working directory, when this checkbox is acitvated.

I would be grateful for answers to the following question:

1.) What is stored in this file?

2.) What is the specific data format of this file?

3.) How can I access the data in this file (import it in matlab or pyhton)?

Thank you in advance

Alexander

  • 0
    TI__Guru 50240 points

    Hi Alexander

    This is a feature that allows the data output stream over UART to be saved. It has the format as shown below, these diagrams will be available in a future user guide for the 68xx Vital Signs Lab.

    Within the Vital Signs Lab folder there is a folder called parse which contains a parsing executable to use on the saved data. Let me know if you have issues using this.

    Regards,

    AG

  • 0 in reply to Akash Gondalia
    Prodigy 100 points

    Thank you for your reply. Could you please help me to understand the output data better. The following questions are not yet clear to me:

    1.) rangeBinIndexPhase: is this the range bin from whicht the phase is deduced for the given time frame?

    1a.) If the rangeBinIndexPhase changes between to measurement frames: does this cause a discontinuity in the variable unwrapPhasePeak_mm so that further evaluation of this data (Band pass filtering, spectral estimation) can only be executed on a  series of consecutive measurement frames with a constant value of rangeBinIndexPhase?

    2.) unwrapPhasePeak_mm: is this the vlaue of the the variable Phi_b(m,nT_s) (corrected by +/-2pi) as defined in the "Vital Signs 68xx Developer's Guide" in section "FMCW Radar - Vital Signs Measurements"? 

    3.) unwrapPhasePeak_mm: Are these the values that are shown in the window "Chest Displacement" of the vital signs lab gui 

    4.) outputFilterBreathout / outputFilterHeartOut : how are these values constructed? I assume these values are deduced of the series unwrapPhasePeak_mm in the procedure as described in the block diagram on slide 6 of the Developer's guide of the Driver Vital Signs Lab in the Automotive Toolbox (s. http://dev.ti.com/tirex/explore/node?node=AMUSsuqxsTHpwmp8m6ix-A__AocYeEd__LATEST ). I this is the case I have the following questions:

    a) How long is the series of frames to which the Bandpass filter is applied to filter the  unwrapPhasePeak_mm

    b) Do the values of  outputFilterBreathout / outputFilterHeartOut correspond to a filtered phase or to a filtered phase differene between consecutive measurement frames?

    5.) outputFilterBreathout / outputFilterHeartOut: Are these the values that are shown in the window "Breating Waveform" and "Heart Waveform" of the vital signs lab gui?

    6.) Is there a resource that explains how the deduction of the heartRateEst_FFT, heartRateEst_FFT_4Hz, heartRateEst_xCorr works?

    7.) What is the difference between heartRateEst_FFT, heartRateEst_FFT_4Hz?

    Thank you in advance

    Alexander

  • 0 in reply to Alexander Groeschel
    TI__Guru 50240 points

    Hi Alexander

    Unfortunately the Vital Signs Lab is provided as-is and isn't actively supported on E2E forums. I would recommend looking at previous E2E threads on the Vital Signs Lab for more information.

    Regards,

    AG