IWR1443: Calibration Data Verification Logic Fails when System Configured for 2nd Antenna Receive Channel

Michael Linden

Part Number: IWR1443
Other Parts Discussed in Thread: TIDEP-0091

Morning folks:

I'm working with code that is based on the IWR1443 High Accuracy Level Measurement Lab. My predecessor left me the following code (below) to verify whether the calibration is good or bad. This logic appears to work correctly when the system is configured for the 1st, 3rd, or 4th antenna receive channel (gMmwMCB.cfg.openCfg.chCfg.rxChannelEn = 1, 4, or 8). However, the logic fails on the DEMO_GOOD_CAL_RESULT portion of the logic when the system is configured for the 2nd antenna receive channel (gMmwMCB.cfg.openCfg.chCfg.rxChannelEn = 2). In the case of the 2nd antenna receive channel calibration, calptr[1] = 2,147,485,694.

Since the system appears to run correctly with the 2nd antenna receive channel calibration, I believe the calibration is actually good, but think that the DEMO_GOOD_CAL_RESULT logic is incorrect.

Any thoughts?

Thanks, Michael

#define DEMO_GOOD_CAL_RESULT           0x17fe

bool rcal_VerifyCalData (void)
{
    bool        valid_calibration;
    uint32_t  *calptr;


    valid_calibration = true;

    calptr = (uint32_t *)&init_cal_data;
    if ((calptr[  0] != 0x00000003) ||
        (calptr[ 57] != 0x00010003) ||
        (calptr[114] != 0x00020003))
    {
        valid_calibration = false;
    }
    else if ((calptr[1] & 0x1fff) != DEMO_GOOD_CAL_RESULT)
    {
        valid_calibration = false;
    }

    return (valid_calibration);
}

over 4 years ago

0 Akash Gondalia over 4 years ago

TI__Guru 50240 points

Hi Michael

Thank you for getting in touch. Can you confirm how you are changing the rxChannelEn mask? I know your code is similar but not the same as code for the TIDEP-0091.

In TIDEP-0091 the rxChannelEn mask is set in demo.c in functions for both demo_staticConfig and demo_calibrationTask. Do you alter mask in both of these or is it done differently?

Regards,

0 Michael Linden over 4 years ago in reply to Akash Gondalia

Intellectual 375 points

rxChannelEn mask is set using the following line of code:

"gMmwMCB.cfg.openCfg.chCfg.rxChannelEn = 2; // Enable second antenna channel (only)"

Additionally, I have used the debugger to confirm that rxChannelEn is 2 when calibration is performed. Since the system runs correctly (very strong amplitude received signal) with this configuration, the calibration appears to be successful/valid and the channel is correct (our hardware is using rx channel 2). Therefore, I do not understand why calibration validation check does not work. However, I don't understand the meaning of the calibration validation logic, either...

Thanks, Michael

0 Akash Gondalia over 4 years ago in reply to Michael Linden

TI__Guru 50240 points

Michael J. Linden said:

rxChannelEn mask is set using the following line of code:

"gMmwMCB.cfg.openCfg.chCfg.rxChannelEn = 2; // Enable second antenna channel (only)"

Thanks Michael, can you clarify which function or functions the above code has been altered in? It is set in two different functions in demo.c code in the TIDEP-0091.

Regards,

0 Akash Gondalia over 4 years ago in reply to Akash Gondalia

TI__Guru 50240 points

Hi Michael I did not mean to click the TI Thinks Resolved button, please disregard it. Regards, AG

0 Michael Linden over 4 years ago in reply to Akash Gondalia

Intellectual 375 points

Hi Akash:

Because the original lab code has been modified, it is now only set in one place. In a new function. I've confirmed that it is correctly set in the data structure after the system comes up using the debugger.

-Michael

0 Akash Gondalia over 4 years ago in reply to Michael Linden

TI__Guru 50240 points

Thanks Michael

I've scheduled to run some tests next week and will have a response sometime on Wednesday.

Let me know if you have any updates in that time.

Regards,

0 Michael Linden over 4 years ago in reply to Akash Gondalia

Intellectual 375 points

Thanks, Akash. My predecessor found that calibration validation logic in a lab or library code, but I'm not really sure if it's appropriate for this configuration.

-Michael

0 Michael Linden over 4 years ago in reply to Akash Gondalia

Intellectual 375 points

Hi Akash:

Just wondering if you've found anything new about validating the calibration?

Thanks! -Michael

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IWR1443: Calibration Data Verification Logic Fails when System Configured for 2nd Antenna Receive Channel