AWR1443BOOST: Abstraction of complex data from rangeProfile

Rajeshwari Chothe

Intellectual 600 points

Part Number: AWR1443BOOST

Hi,

I want complex values from rangeProfile that is being send via UART. How can I get complex values?

Thanks,

Rajeshwari

over 5 years ago

0 Jitendra Gupta over 5 years ago

TI__Guru 69990 points

Hi Rajeshwari,

Please refer the mmw demo source code to reverse map the original structure which is being sent as rangeProfile to Visualizer.

main.c: MmwDemo_transmitProcessedOutput() -> UART_writePolling (uartHandle, (uint8_t*)&obj->rangeDopplerLogMagMatrix[i*obj->numDopplerBins], sizeof(uint16_t));

On the Visualizer you can capture the raw UART data and pick up required data.

Regards,

Jitendra

0 Rajeshwari Chothe over 5 years ago in reply to Jitendra Gupta

Intellectual 600 points

Hi Jitendra,

I reverse mapped original structure of rangeProfile that is being sent over UART, but didn't get what I am looking for. Result of FFT is surely complex in nature. But on decoding data received by UART port I am getting real values. So I am little confused if these are real values or absolute values?

Regards,

Rajeshwari

0 Jitendra Gupta over 5 years ago in reply to Rajeshwari Chothe

TI__Guru 69990 points

Hi Rajeshwari,

In this demo looks like this is only real (size of 2 bytes).

So with this demo, you need to rely on this data type only.

Regards,

Jitendra

0 Rajeshwari Chothe over 5 years ago in reply to Jitendra Gupta

Intellectual 600 points

Hi,

Thank you for your reply!

Can you tell where these separation of real and imaginary values is taking place? I mean in which .c file like post_processing,data_path or in main file itself. Range-profile data is stored in the rangeDopplerLogMagMatrix part of L3 memory and I am not able to locate place where real data from FFT is being stored in this memory. Thank you in advance!

Regards,

Rajeshwari

0 Jitendra Gupta over 5 years ago in reply to Rajeshwari Chothe

TI__Guru 69990 points

Hi Rajeshwari,

This buffer is being filled by HWA output from eDMA.

This structure's address is assigned at memory allocation, you need to check this address from CCS (in debug mode).

Regards,

Jitendra

0 Piyush_ over 5 years ago

TI__Expert 5235 points

rangeProfile is the sum of log magnitude across virtual antennas of the 2D FFT output at 0th doppler, it is by definition not complex.

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AWR1443BOOST: Abstraction of complex data from rangeProfile