用FPGA实现FFT，通过状态机控制，分析信号频域信息-Using FPGA to achieve FFT, through state machine control, analysis signal frequency domain information

实现了STM32座FFT功能，不需要FPGA,只需要STM32就可以实现(The implementation of the STM32 seat FFT function, do not need FPGA, only STM32 can be implemented)