problems with fft routines in the dsplib of the dsk 5402 | TMS320C54x

Technical discussions about the TI C54x DSPs (including the c5401, c5402, c5402a, c5404, c5407, c5409, c5409a, c5410, c5410a, c5416, c5420, c5421, c5441, c549, c5470 and c5471).

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hi, i am implementing a simple program on the dsk 5402, which involves a fourier transform. Reading the application notes i have found out that there are some functions in the dsplib that do the hard work ('rfft256' and 'cbrev' for example). When i have tested them and compared the results with the matlab outputs, i have found out that the results are WRONG: the real part is quite the same (differences of 2-3 can be explained by the rounding error) but in the imaginary part, there is a block of indexes in the middle of the output buffer that are completely wrong (while the first indexes, and the last ones obviously, are o.k.). I found that in any length of the fft there is a block in the middle of the imaginary part which is wrong, and its size increases as the fft length goes larger. i must emphasize that i have been careful in the alignment needed, and i used cbrev as specified in the notes. Did any one met the same problems ? Where can i find any updated versions of the dsplib ? Thanks, Raffaele DaTo Italy.

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Discussion Groups | TMS320C54x | problems with fft routines in the dsplib of the dsk 5402

problems with fft routines in the dsplib of the dsk 5402 - radato1 - Jun 3 15:08:00 2002