linux下的串口配置及测试程序，可以在此基础上增加功能，实现linux串口程序，可以选择波特率等配置，相当于一个简单的串口调试助手-serial port configuration and testing procedures under linux, you can add functionality on this basis to achieve the linux serial procedures, you can choose the configuration of the baud rate, etc., which is equivalent to a simple serial port debugging assistant