TDA2PXEVM: Why is the limitation in numAdcSamples in TDA?

Nishant G

Part Number: TDA2PXEVM

In PROCESSOR_SDK_VISION (ver 3.6), in chains_common_cascade_ar12xx_config_mimo.c, line 203 mentions "/*profileCfgArgs[1].numAdcSamples * 2 - 512 * 2*/". I believe 512 is the maximum possible value that can be entered for numAdcSamples for complex FFT calculations. As numAdcSamples is used to determine the Range FFT, this limits the maximum possible Range FFT using TDA2px. Could you tell me what is causing this limitation? Is it because of any particular Hardware component (for eg buffer size)? I tried entering 1024 to increase the FFT size, but then my frame rate reduced drastically. What might be causing this issue?

I look forward to your reply.

Best Regards,

Nishant

over 6 years ago

0 Piyali Goswami over 6 years ago

TI__Mastermind 30245 points

Nishant,

You should be able to set 1024 in the configuration, are you setting the timings for the ramp end time and the frameperiodicity appropriately for the frame rate you would like to achieve.

Thanks and Regards,
Piyali

0 Nishant G over 6 years ago in reply to Piyali Goswami

Expert 1600 points

Thank you Piyali for confirming that the range bin size can be increased to 1024. I will look into the ramp end time and frame periodicity aspects.

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TDA2PXEVM: Why is the limitation in numAdcSamples in TDA?