stm32 USB 开发，上位机，驱动，下位机程序参考-stm32 USB development, host computer, drive, lower computer program reference

上位机vc6.0编程控制西门子GPRS模块实现短信收发，GPRS收发数据，并且此程序可以移植到带有操作系统UCOS-II或LINUX的下位机，框架结构很好，效率很高。-Programming the control PC vc6.0 Siemens GPRS module to send and receive SMS, GPRS to send and receive data, and this process can be transferred to UCOS-II with the o