STM32下做的usb转RS232程序，有兴趣的同志可以参考下，开发板为MCBSTM32-STM32 done under the usb to RS232 procedures comrades are interested can refer to, the development board for MCBSTM32

Windows下STM32 USB虚拟串口驱动程序。本人经多次实验发现，必须在开发时，设置CDC的PID和VID两个参数与驱动程序中stmcdc.inf中的数字相同。否则，系统将不可识别STM32的USB口为串口。(STM32 USB virtual serial port driver under Windows. I have many experiments found that must be in development, s