I was looking myself for some code for doing FFT that will be fast enough for spectrum display of music, but did not find any.
With Arduino I had to give up as the best I could do is 2-3 times a second which visually not good enough.
The code linked here does it in 50ms overall so 20 times a second which is really good, however it using RLP (native) code. Hope you will find it useful.
The FFT code was taken from Plain FFT by Didier Longueville who maintains blog at Arduinoos site http://didier.longue...e.fr/arduinoos/ and was generous to share it with us. Thank you Didier!
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Working FFT with RLP code
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