Mega128 recently wrote a 128-point FFT procedures, floating-point operations, Hanning window. Since the window function and the twiddle factor look-up table has been adopted, so the speed can also be, the initial value to the process through high-speed AD collected 20KHz sinusoidal signal. The calculation results with the Matlab

Packet : 15883841armok01167658.rar filelist
FFT\default\dep\FFT.o.d
FFT\default\FFT.eep
FFT\default\FFT.elf
FFT\default\FFT.hex
FFT\default\FFT.o
FFT\default\Makefile
FFT\FFT.aps
FFT\FFT.c
FFT\default\dep
FFT\default
FFT

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