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RTOS/XTCIEVMK2LX: How can I get long length (~20M points) of FFT?

Part Number: XTCIEVMK2LX


Tool/software: TI-RTOS

Hello,

I'm not sure that I'm at the right place to ask this, please move this post to the right place if not.

I'm trying to use the FFT functions included in the DSPLIB these days, especially DSPF_sp_fftSPXSP().

By the description of the function, the input length of FFT in complex samples must be less or equal to 131072, which is only about 0.13M points.

I have a 20M-points signal to FFT, so how can I do this? Is there another function included in the DSPLIB or another library that I can exploit in this case? Or should I implement my own FFT function for this?

Thank you very much!