AWR1642: How to read ADC raw data from Ti in mmw demo.

Hi,

In mmw demo, I tried to read the raw ADC data of one chirp using the following code changes, Please can you confirm is it proper or not.

1) dss_main.c: Read raw data from obj->ADCdataBuf into Uart local buffer ptrCurrBuffer in MmwDemo_dssSendProcessOutputToMSS() function.

/* Sending raw data information */

{
itemPayloadLen = obj->numRxAntennas*obj->numRangeBins*sizeof(cmplx16ReIm_t);
totalHsmSize += itemPayloadLen;
if(totalHsmSize > outputBufSize)
{
retVal = -1;
goto Exit;
}
memcpy(ptrCurrBuffer, (void *)obj->ADCdataBuf, itemPayloadLen);
for(i=0;i<obj->numRangeBins*obj->numRxAntennas;i++)
{
CheckSum = CheckSum+obj->ADCdataBuf[i].real;
CheckSum = CheckSum+obj->ADCdataBuf[i].imag;
}

iptr1 = (int32_t *)((uint32_t)ptrHsmBuffer + totalHsmSize);
//iptr1[0] = CheckSum;
itemPayloadLen = itemPayloadLen+4; //4 is for check sum
totalHsmSize += 4; //4 is for check sum

message.body.detObj.tlv[tlvIdx].length = itemPayloadLen;
message.body.detObj.tlv[tlvIdx].type = MMWDEMO_OUTPUT_MSG_STATS; //currently dummy
message.body.detObj.tlv[tlvIdx].address = (uint32_t) ptrCurrBuffer;;
tlvIdx++;

/* Incrementing pointer to HSM buffer */
ptrCurrBuffer = (uint8_t *)((uint32_t)ptrHsmBuffer + totalHsmSize);
//totalPacketLen += sizeof(MmwDemo_output_message_tl) + itemPayloadLen; //not incrementing so that same code can be used with TI gui
}

2)mss_main.c: sending the raw adc data from local uart buffer to PC in MmwDemo_mboxReadTask().

3)raw and fft plot of adc data in scilab.

4) Scilab Code to plot the raw data.





NumAdcSamples = 256;
ComplexSamples = (2*NumAdcSamples);
ChRawDataStartIndex = 2;
Numch  = 4;

Ch1Start = 2;
Ch1End   = (Ch1Start+ComplexSamples-1);
Ch2Start = Ch1End+1;
Ch2End   = (Ch2Start+ComplexSamples-1);
Ch3Start = Ch2End+1;
Ch3End   = (Ch3Start+ComplexSamples-1);
Ch4Start = Ch3End+1;
Ch4End   = (Ch4Start+ComplexSamples-1);

B = read_csv('D:\ScilabModel\DataRawAdc1.csv',',','double');
Tag = evstr(B(:,1));

Temp1 = size(B);
TotFrames = Temp1(1);

for Frm=1:TotFrames
    for ch=1:Numch
        StartIndex = ChRawDataStartIndex+((ch-1)*ComplexSamples);
        EndIndex   = StartIndex+ComplexSamples-1;
        RawIQ(ch,:) = evstr(B(Frm,StartIndex:EndIndex));
        RawI(ch,:) = RawIQ(ch,1:2:ComplexSamples);
        RawQ(ch,:) = RawIQ(ch,2:2:ComplexSamples);
        CmplxIQ(ch,:) = RawI(ch,:)+sqrt(-1)*RawQ(ch,:);
        //D1 = CmplxIQ(ch,(64+1):(64+64));
        FFTCmplxIQ(ch,:) = fft(CmplxIQ(ch,:));
        Phase_FFTCmplxIQ(ch,:) = atan(imag(FFTCmplxIQ(ch,:)),real(FFTCmplxIQ(ch,:)));
        //FFTCmplxIQ = fft(D1);
        //Phase_FFTCmplxIQ = atan(imag(FFTCmplxIQ),real(FFTCmplxIQ));

        scf(1);
        clf(1);
        drawlater();
        subplot(3,1,1);plot(RawI(ch,:)');plot(RawQ(ch,:)');
        title("Ch, IQ");
        subplot(3,1,2);plot(abs(FFTCmplxIQ(ch,:)'));
        //subplot(3,1,2);plot(abs(FFTCmplxIQ'));
        title("Ch, Mag FFT IQ");
        subplot(3,1,3);plot(Phase_FFTCmplxIQ(ch,:)');
        //subplot(3,1,3);plot(Phase_FFTCmplxIQ');
        title("Ch, phase FFT IQ");
        drawnow();
        sleep(100);
    end
end