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Original question:

IWR6843AOP: Single measurement on Level sensing lab

IWR6843AOP: High accuracy lab data format

Julia Sánchez Sánchez
Prodigy 115 points
Part Number: IWR6843AOP

Hello,

I'm working with IWR6843AOP with High Accuracy lab FW, with the intention of integrating this solution in a device.

For this aim, I need to read the DATA UART and understand its output without the visualizer GUI. I've been trying to use a python parser I've developed and tested for the OOB demo, that reads and interprets TLV packets.

This parser works perfectly with OOB demo output but it's not working with High Accuracy Lab output, so I guess the format is different.

I'm using the prebuilt binary for this demo so I know that the source of this problem it's not a modification I've made to the code.

Thanks in advance for your time and best regards,

Julia Sánchez.

  • 0
    TI__Genius 11850 points

    Hi,

    Following is the TLV Format

    numDetetedObj (16 bits);  // Always set to 1

    xyzQFormat(16 bits);  //Set to 20

    Peak 1 (LSB 16 bits)

    Peak 3 (LSB 16 bits)

    Peak 2 (LSB 16 bits)

    Peak 1 (MSB16 bits)

    Peak 2 (MSB 16 bits)

     Peak 3 (MSB 16 bits)

    Peak 1,2,3 are floating point numbers

    You can refer to MmwDemo_transmitProcessedOutput() function in mss_main.c in  radar_toolbox_1_20_00_11\source\ti\examples\Level_Sensing\high_accuracy\src\68xx\mss

    Regards,

  • 0 in reply to Abhishek Karkisaval
    Prodigy 115 points

    Hello Abshishek,

    Thank you for your answer. I'm looking at the function you referred to (MmwDemo_transmitProcessedOutput() function in mss_main.c of the lab FW) and I have a doubt. You mentioned peak 1, peak 2 and peak 3, but in the code what I see is a structure named dummyDetectionOut of type MmwDemo_detectedObj, in which there are no value peak 1,2 and 3 but "rangeIdx, x, peakVal..." which doesn't seem to correspond to different objects. Is that because the structure is used in an inaccurate way or because I'm getting lost somewhere? Because it doesn't relate to what you're telling me.

    Best regards and thanks again,

    Julia.

  • +1 in reply to Julia Sánchez Sánchez
    TI__Genius 11850 points

    Hi Julia,

    The High accuracy lab output does not have a dedicated TLV format. It used the existing TLV of the structure to MmwDemo_detectedObj to send the 3 detected peaks.

    Below code in the same function assigns the 3 peaks as per the format that I mentioned.

    tempRange = (int32_t)(outputData->rangeEst * 1048576.f);
    tempRange1 = (int32_t)(outputData->rangeEst1 * 1048576.f);
    tempRange2 = (int32_t)(outputData->rangeEst2 * 1048576.f);


    dummyDetectionOut.rangeIdx = (uint16_t) tempRange & 0xFFFF;
    dummyDetectionOut.x = tempRange >> 16;

    dummyDetectionOut.peakVal = (uint16_t) tempRange1 & 0xFFFF;
    dummyDetectionOut.y = tempRange1 >> 16;

    dummyDetectionOut.dopplerIdx = (uint16_t) tempRange2 & 0xFFFF;
    dummyDetectionOut.z = tempRange2 >> 16;

    Regards,

    Abhishek

  • 0 in reply to Abhishek Karkisaval
    Prodigy 115 points

    Hello Abhishek,

    That's what I thought. Thank you very much, this solved my issue.

    Best regards, Julia.