AWR2243: MMWCAS-RF-EVM BPM don't work

user5778500

Part Number: AWR2243
Other Parts Discussed in Thread: MMWCAS-RF-EVM

our condition: MMWCAS-RF-EVM and host cpu(ARM);

My configuration for BPM is as follows: Only one antenna channel is enabled, all receiving channels are enabled. I set two chirp, The first chirp is in the 0 phase and the second chirp is in the 180 phase.The frame configuration is:chirpStartIdx:0 chirpEndIdx:1 numloops:64.

We watched the doppler fft data.We think BPM don't work because there is a spectrum only in a specific place.

The relevant code is as follows:

bpmCfgArgs_master[0].chirpEndIdx = 0;
bpmCfgArgs_master[0.chirpStartIdx = 0;
bpmCfgArgs_master[0].constBpmVal =0;
bpmCfgArgs_master[0].reserved =0;

bpmCfgArgs_master[1].chirpEndIdx = 0;
bpmCfgArgs_master[1].chirpStartIdx = 0;
bpmCfgArgs_master[1].constBpmVal =2;
bpmCfgArgs_master[1].reserved =0;

bpmCfgArgs_slaver1[0].chirpEndIdx = 0;
bpmCfgArgs_slaver1[0.chirpStartIdx = 0;
bpmCfgArgs_slaver1[0].constBpmVal =0;
bpmCfgArgs_slaver1[0].reserved =0;

bpmCfgArgs_slaver1[1].chirpEndIdx = 0;
bpmCfgArgs_slaver1[1].chirpStartIdx = 0;
bpmCfgArgs_slaver1[1].constBpmVal =0;
bpmCfgArgs_slaver1[1].reserved =0;

......

int MMWL_BPMConfig(unsigned char deviceMap)
{
int retVal = RL_RET_CODE_OK;
rlBpmChirpCfg_t bpmCfgArgs[30] = { 0 };

    if(deviceMap==1)
    {
           bpmnum = bpmchip1num;
    }
    if(deviceMap==2)
    {
      bpmnum = bpmchip2num;
    }
    if(deviceMap==4)
    {
      bpmnum = bpmchip3num;
    }
    if(deviceMap==8)
    {
      bpmnum = bpmchip4num;
    }
    printf("bpmnum is %d\n",bpmnum);

        if(deviceMap==1)
      {
          memcpy(&bpmCfgArgs[0],&bpmCfgArgs_master[0],bpmnum*sizeof(rlBpmChirpCfg_t));
      }
    if(deviceMap==2)
    {
         memcpy(&bpmCfgArgs[0],&bpmCfgArgs_slaver1[0],bpmnum*sizeof(rlBpmChirpCfg_t));
    }
    if(deviceMap==4)
    {
        memcpy(&bpmCfgArgs[0],&bpmCfgArgs_slaver2[0],bpmnum*sizeof(rlBpmChirpCfg_t));
    }
    if(deviceMap==8)
    {
        memcpy(&bpmCfgArgs[0],&bpmCfgArgs_slaver3[0],bpmnum*sizeof(rlBpmChirpCfg_t));

// bpmCfgArgs_slaver3[0].constBpmVal=0;
// bpmCfgArgs_slaver3[1].constBpmVal=32;

}
for(int i=0;i<bpmnum;i++)

    {
      retVal = rlSetBpmChirpConfig(deviceMap, &bpmCfgArgs[i]);
      printf("bpmCfgArgs[%d].chirpStartIdx is %d\n",i,bpmCfgArgs[i].chirpStartIdx);
            printf("bpmCfgArgs[%d].chirpEndIdx is %d\n",i,bpmCfgArgs[i].chirpEndIdx);
            printf("bpmCfgArgs[%d].constBpmVal is %d\n",i,bpmCfgArgs[i].constBpmVal);
    }
    return retVal;
}

rlBpmCommonCfg_t data={0};
                rlBpmModeCfg_t mode={0};
                mode.b2SrcSel=0;
                data.mode=mode;
                rlSetBpmCommonConfig(RL_DEVICE_MAP_CASCADED_1,&data);
                rlSetBpmCommonConfig(RL_DEVICE_MAP_CASCADED_2,&data);
                rlSetBpmCommonConfig(RL_DEVICE_MAP_CASCADED_3,&data);
                rlSetBpmCommonConfig(RL_DEVICE_MAP_CASCADED_4,&data);
                   printf("rlSetBpmCommonConfig end\n");

retVal = MMWL_BPMConfig(RL_DEVICE_MAP_CASCADED_1);

retVal = MMWL_BPMConfig(RL_DEVICE_MAP_CASCADED_2);

.......

Do you have any good ways to verify BPM that you can tell me about

Could you tell me other good ways to verify BPM or PHASE SHIFTER？THANKS

over 5 years ago

0 Jitendra Gupta over 5 years ago

TI__Guru 69960 points

Configuration you are setting is slightly wrong.

E.g. frameConfig: chirpStartIdx=0, chirpEndIdx=1, numLoop=10 (total 20*2 chirps in a frame)

and each chirp is configured with Tx0 only

Then BPM Config:

bpmCfgArgs_master[0].chirpEndIdx = 0;
bpmCfgArgs_master[0.chirpStartIdx = 0;
bpmCfgArgs_master[0].constBpmVal =0;
bpmCfgArgs_master[0].reserved =0;

bpmCfgArgs_master[1].chirpEndIdx = 1;
bpmCfgArgs_master[1].chirpStartIdx = 1;
bpmCfgArgs_master[1].constBpmVal =1; /* Tx0 ON: 180 degree */
bpmCfgArgs_master[1].reserved =0;

bpmCfgArgs_slaver1[0].chirpEndIdx = 0;
bpmCfgArgs_slaver1[0.chirpStartIdx = 0;
bpmCfgArgs_slaver1[0].constBpmVal =0;
bpmCfgArgs_slaver1[0].reserved =0;

bpmCfgArgs_slaver1[1].chirpEndIdx = 1;
bpmCfgArgs_slaver1[1].chirpStartIdx = 1;
bpmCfgArgs_slaver1[1].constBpmVal =1; /* Tx0 ON: 180 degree */
bpmCfgArgs_slaver1[1].reserved =0;

To verify you can use mmwave Studio to configure, capture then post-proc : time domain plot you could see alternate 0/180 degree amplitude.

Here is snapshot of two chirp time-domain plot, where you can see sinosoid is changed by 180 degree.

Regards,

Jitendra

0 user5778500 over 5 years ago in reply to Jitendra Gupta

Prodigy 50 points

Sorry, I made a mistake in above code,it should be:

bpmCfgArgs_master[1].chirpEndIdx = 1;
bpmCfgArgs_master[1].chirpStartIdx = 1;
bpmCfgArgs_master[1].constBpmVal =2; //tx0 turn on

constBpmVal is defined as follows in mmWave Radar Interface Control Document Revision 2.7:

Bit    Definition
b0    RESERVED
b1 CONST_BPM_VAL_TX0_TXON
   Value of Binary Phase Shift value for TX0, during
chirp
b2 RESERVED
b3    CONST_BPM_VAL_TX1_TXON
Value of Binary Phase Shift value for TX1, during
   chirp
b4    RESERVED
b5    CONST_BPM_VAL_TX2_TXON
Value of Binary Phase Shift value for TX2, during
chirp
b15:6 RESERVED

0 user5778500 over 5 years ago in reply to Jitendra Gupta

Prodigy 50 points

I I plot time domain time , I still can't see alternate 0/180 degree amplitude. It seems BPM is still not working.

And I I try to use advance chirp to config BPM.But my results were the same.

0 Jitendra Gupta over 5 years ago in reply to user5778500

TI__Guru 69960 points

Hello,

I recommend using mmwave studio first to verify your usecase with BPM feature and plot using PostProc as I did in above reply.

http://www.ti.com/tool/MMWAVE-STUDIO (mmwave Studio -2G)

Regards,

Jitendra

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AWR2243: MMWCAS-RF-EVM BPM don't work