C语言编写的串口测试程序，简单实用，支持串口接收和发送数据，支持多个波特率，无需进行任何修改，正确编译执行，多平台测试通过-C language prepared by the serial testing procedures, simple and practical, support serial port to receive and send data, support for multiple baud rate, without any modification, the correct compiler implementation, multi-platform testing by