c语言实现的串口模块，全功能提供；包含读写、设置等复杂情况，亲测可用。-c language serial module, provides full-function comprising read and write, set up complex cases, pro-test available.

For time-frequency analysis algorithm, Complex of three-point Gauss-lengend the Formula pi, Including the generalized cross-correlation function GCC time delay estimation.

在单片中模拟多线程实现方式，可以在无法移植操作系统的单片机上实现复杂功能和协议。(It can realize complex function and protocol in MCU which can't transplant OS by simulating Multithread in single chip.)