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STM32F10xxx DSP library FFT algorithm

Question asked by mathur.abhishek.002 on Oct 11, 2011
Latest reply on Oct 9, 2013 by Clive One

I am using STM32F10xxx DSP library (not the CMSIS DSP)algorithm for calculating FFT of an input sequence.
I want to know the order in whcih the input samples is expected by this algorithm and the order in which the output is given, For eg:
If FFT of x[0] is X[0]
so if I give input as x[0],x[1],x[2],x[3] . . .
then will I get output as X[0],X[1],X[2],X[3] . . .
ie. input in natural orde and output in natural order
ie. the algorithm has inbuilt bit reversal implemented.
OR the input and output should be in any other order.

I want to know that if by any means I can generate twiddle factors of my own then can I use the
64 point, 256 point and 1024 point algorithms for calculating FFT at higher points say 2048.??