flasher86, I think there is a lot of notions you have to learn there, I think it is more complicated than the touch driver you want to do.
If you want to do a tuner and use FFT, you can either use the DSP instructions offered by the ARM7E core or my the DSP (ZSP400) core.
None of them support floating point (single or double precision). You would have to use so called fixed point arithmetic.
You are in luck because the stroboscope already does an FFT, but only 128 points which might not be accurate enough for a tuner :
Rockchip Developer Package\RK225_Dict_08_28\WMADecode\Stroboscope
Anyways, if I were you I would first experiment with this on the PC and then come back later to the MPX players....
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