[Dspforum] FFT QDMA help

[O'Connor, Sean R.]

Doug/Joseph,

I am having issues with this assignment, so I have uploaded my project directory to the website.

The QDMA portion appears to work fine.  I verified this by loading increasing integers (cast as floats) into the RAM starting at address 0x80000000, QDMAing the data to the internal memory and then QDMAing it out starting at 0x803A9800 without doing any FFT functions.  I exported this file and analyzed it in matlab, and it was perfectly intact.

Performing the STFT on the data produces QNANs and INFs in the data output, however, a single FFT works fine.  I can QDMA any chunk of 8192 complex samples, take the FFT, QDMA it out to 0x803A9800, export it to matlab and it looks fine.  It seems multiple FFTs cause issues... I will continue to work at it, but any input you might have would be greatly appreciated.

Thanks,
Sean
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