利用ti54x系列dsp编解码dtmf源程序的第三版，改进了算法，更适合移植。利用make.bat可进行编译。-use ti54x series dsp Either source codec, the third edition, improved algorithm, more suitable for transplantation. Make.bat use can be compiled.

uart通讯口的接收设计，符合大部分的uart接口协议，方便用户进行移植。-uart the receive communication port design, in line with most of the the uart interface protocol, user-transplant.