FFT Nan Values; ADC DMA

[AKhot.1]

I am getting nan values while computing the fft. It is mostly for fftOut[0][0]----- fftOut[0][512], after that there are not many nan values. What could be the reason?

Is it that because it running in debug mode and the DMA is on?

Please help with this.

[TDK · Accepted solution]

You are calling arm_rfft_fast_f32 multiple times (nChirp times) on the same data. That's no good here.

[AKhot.1]

So, if I have a 2D array I need not to put the arm_rfft_fast_f32 function in for loop? I thought it would take ftt one by one along the row.