串口是计算机上一种非常通用设备通信的协议（不要与通用串行总线Universal Serial Bus或者USB混淆）.其中包含了arm和51版本的串口程序，但是也不好公开，就公开一个51版本的吧，都差不多，很容易移植的-Computer serial port is a very common device communication protocol (not with the Universal Serial Bus Universal Serial Bus or USB confusion). Which includes the arm and the 51 version of the serial program, but not good public, the public version of a 51 it, are similar, it is easy to transplant