采用串口API 编写的重叠IO方式的串口通信程序，多次测试，性能不错。-com communication program by use com api overlapped io,and have a good performance

Unfortunately Microsoft has never paid much attention to the serial port. In the Windows API it is just regarded as a file, and in the first version (1.1) of the .NET framework (managed code) there was no support for serial communication. Fortunately

stm32 按键IO口操作，UART与从机通信-stm32 key IO port operation, UART communication with a slave