C语言写的串口通讯程序，直接使用可以读写串口数据，包括打开串口，向串口写入数据，关闭串口参考，串口参数可以自己设置，容易扩展，简单实用。-C language to write the serial communication program, direct use can read and write serial data, including open serial port, the serial port to write data, close the serial port inf