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# bsp usb
简单写点,有待优化. 目前仅支持虚拟串口通信,暂未开发其他内容.
注意，为了增加发送完成和接收完成回调，对Inc/usbd_xxxx.h四个文件做了修改，对Src/usbxxx.c也进行了修改。