IWR1443: High Accuracy Range Measurement - 14xx / Level Sense Demo (TIDEP-0091) - how the 1D FFT output is organized in memory L3?

Hi All,

1. in High Accuracy Range Measurement - 14xx, the following CLI command is used to config the adcbuf :

adcbufCfg 0 1 0 1

which means, Complex data out, Q in LSB and I in MSB, Interleaved samples, fixed value for chirp thres.

2. in Level Sense Demo (TIDEP-0091) uses following lines to config ADCBUF in demo.c demo_staticConfig:

/* Populate Adcbuf configuration: */
  adcbufCfg->adcFmt             = 0; //0=complex
  adcbufCfg->iqSwapSel          = 1; //1=Q in LSB, I in MSB
  adcbufCfg->chInterleave       = 1; //not interleaved
  adcbufCfg->chirpThreshold     = 1;

which uses non-interleaved samples

In both cases, ADCBUF outputs complex samples (I & Q) and the input to the FFT module is a complex signal. 

A) in these two cases, does the 1D FFT output stored in a different way due to the ADCBUF interleaved/non-interleaved change? 

I mean the way imag. and real parts of the 1D FFT out is organized in L3 local memory is different due to the interleaved/non-interleaved change?

Any documentation or an explanation would be appropriated. 

B) From the source of TIDEP-0091, demo.c, demo_findTopTanges it seems that the  imaginary and complex parts are stored next to each other. : 

Here, which one is imaginary and which one is real component? 

for (idx = START_IDX; idx < DEMOCFG_NUM_ADC_SAMPLES; idx ++)
  {
    mag[idx] = 0;

    for (idx2 = 0; idx2 < chirps * 2; idx2 ++)
    {
      //Sum the squares of the magnitudes (of I and Q) and sum the chirps.
      //(don't need to do square roots since we'll only looking for max)
      temp = *fft_out++ >> 1;
      mag[idx] += (temp * temp);
    }
  }

C) in High Accuracy Demo 14xx, (i.e. with interleaved samples) how the imag. and real parts of the1D FFT output is stored in MMW_HWA_1D_OUT_PING memory? 

Is this similar to non-interleaved complex input signal ?

The reason why I'm asking this info. is, I need to find few peak values in 1D FFT output.  Is there any documentation on how the real and imaginary signals are stored in memory? 

Thanks,

Randy