实现FFT算法，适合于新华龙单片机C8051F系列，FFT需要速度高，一般的单片机很难做，对于C8051F12系列，可以达到50M至100M的速度，完全够用！-Implement FFT algorithm suitable for the new Dragon C8051F series microcontrollers, FFT requires high speed, the average single-chip hard to do, for C8051F12 series, you can reach the speed of 50M to 100M, full enough!