傅立叶变换与傅立叶逆变换，使用的是整型数据。一次变换时间15MS左右，正反变换30MS左右。已经在STM32F1系列（因为没有浮点运算，只能整型运算。）的上运行测试OK。- Fourier transform and inverse Fourier transform, using integer data. A transition time around 15MS, transform pros around 30MS. Has STM32F1 series (because there

1. press button K1, serial port print function armcalculation results and sampling waveform.(1. press button K1, serial port print function arm calculation results and sampling waveform.)