c8051f430单片机提供了usb接口，利用此接口可以方便制成usb存储器，此代码为u盘的底层代码，包括设置寄存器，完成usb2.0协议，具体需要配合文件系统实现U盘的功能-c8051f430 microcontroller provides a usb interface, this interface can be easily made using usb memory, this code is the underlying code for the u disk, including