说明：  使用方便的串口通信模块 功 能: 串口中断服务程序，通过简单调用即可完成串口输入输出的处理。 输入输出均设有缓冲区，可任意设置大小。
(Easy-to-use serial communication module features: serial port interrupt service routine, through a simple call to complete the deal with serial input and output. Input and output are provided in the buffer zone size can be arbitrarily set.)