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c674x dsplib padding

István Gyürki
Intellectual 310 points

Hi All,

I'm using c674x dsplib 3.1.0.0 for fft/ifft, functions DSPF_sp_ifftSPxSP/DSPF_sp_fftSPxSP.

I noticed that the demo code (DSPF_sp_fftSPxSP_d.c) does use some padding both at the beginning and at the end of x/y/w arrays.

However, neither the code nor the documentation of c674x dsplib mentions that it'd be necessary to add padding.

I took a look of C67x dsplib, and there the doc says (http://www.ti.com/lit/ug/spru657c/spru657c.pdf) that for DSPF_sp_ifftSPxSP input array x needs a padding at the end.

So I'd like to ask, if in case of c674x dsplib DSPF_sp_ifftSPxSP/DSPF_sp_fftSPxSP do one need to add some padding, if yes, then for which arrays, how long and at the beginning and/or at the end?

Thanks,

Istvan