arm实验时编写的linux串口程序，实现了基本的串口通讯功能，并在接收报文时，使用了环形缓冲区，希望程序对大家有所帮助，如有Bug，请给我留言，谢谢。-arm experiments prepared by the linux serial procedures to achieve the basic serial communications functions, the reported receiving text, the use of the circular buffer, we