CCS/AWR1843BOOST: WEBENCH® Tools/AWR1843BOOST:

Hi,

The code defines two processing paths. Unfortunately the terminology is a little confusing. "MAX_VEL_ENH_PROCESSING" refers actually to MRR subframe and "POINT_CLOUD_PROCESSING" refers to USRR subframe.

/*! @brief There are two processing paths in the MRR Demo. */
#define MAX_VEL_ENH_PROCESSING (0U)
#define POINT_CLOUD_PROCESSING (1U)

So, as shown in the code, the Velocity Enhancement is ONLY performed on MRR subframes.

Please see following section of the code

labs\lab0007_medium_range_radar\src\dss\dss_data_path.c

/**
*  @b Description
*  @n
*    Interframe processing. It is called from MmwDemo_dssDataPathProcessEvents
*    after all chirps of the frame have been received and 1D FFT processing on them
*    has been completed.
*
*  @retval
*      Not Applicable.
*/
void MmwDemo_interFrameProcessing(MmwDemo_DSS_DataPathObj *obj, uint8_t subframeIndx)
{
    uint32_t rangeIdx, detIdx1, numDetObjPerCfar, numDetDopplerLine1D, numDetObj1D, numDetObj2D;
    volatile uint32_t startTime;
    volatile uint32_t startTimeWait;
    uint32_t waitingTime = 0;
    uint32_t pingPongIdx = 0;
    uint32_t dopplerLine, dopplerLineNext;
    startTime = Cycleprofiler_getTimeStamp();
       
    /* Trigger first DMA (Ping) to bring the 1DFFT data out of L3 to dstPingPong buffer  */
    MmwDemo_startDmaTransfer(obj->edmaHandle[EDMA_INSTANCE_DSS],
        MRR_SF0_EDMA_CH_2D_IN_PING,
        MRR_SF1_EDMA_CH_2D_IN_PING,
        subframeIndx);

    /* Initialize the  variable that keeps track of the number of objects detected */
    numDetDopplerLine1D = 0;
    numDetObj1D = 0;
    MmwDemo_resetDopplerLines(&obj->detDopplerLines);
    
    for (rangeIdx = 0; rangeIdx < obj->numRangeBins; rangeIdx++)
    {
        
       
        /* Perform the 2nd dimension  FFT (doppler-FFT), compute the log2Abs, and provide the
         * noncoherently added sum of the log2Abs across antennas as the output (sumAbs). */
        waitingTime += secondDimFFTandLog2Computation(obj, obj->sumAbs, CHECK_FOR_DET_MATRIX_TX, rangeIdx, &pingPongIdx);

        if (obj->processingPath == MAX_VEL_ENH_PROCESSING)
        {
            /* In the subframe for maximum velocity enancement, the second half of the chirps of the
            * subframe consists of 'slow chirps', i.e., chirps with larger idle times compared to
            * the first set. These have a different (lower) max-unambiguous-velocities, and its
            * 2D-FFT output can be used (along with the 2D-FFT output of the 'fast-chirps' of the
            * first half of the frame ) with the chinese remainder theorem (or CRT) to increase
            * the max-unambiguous velocity. */
            waitingTime += secondDimFFTandLog2Computation(obj, obj->sumAbsSlowChirp, DO_NOT_CHECK_FOR_DET_MATRIX_TX, rangeIdx, &pingPongIdx);
        }

        /* doppler-CFAR-detecton on the current range gate.*/
        numDetObjPerCfar = cfarCa_SO_dBwrap_withSNR(
            obj->sumAbs,
            obj->cfarDetObjIndexBuf,
            obj->cfarDetObjSNR,
            obj->numDopplerBins,
            obj->cfarCfgDoppler.thresholdScale,
            obj->cfarCfgDoppler.noiseDivShift,
            obj->cfarCfgDoppler.guardLen,
            obj->cfarCfgDoppler.winLen);

        /* Reduce the detected objects to peaks. */
        numDetObjPerCfar = pruneToPeaks(obj->cfarDetObjIndexBuf, obj->cfarDetObjSNR,
                                        numDetObjPerCfar, obj->sumAbs, obj->numDopplerBins);