The driver designed in this paper can support portable storage device and HID device. It is helpful for the developing of other embedded USB host driver.
所设计的驱动程序能够支持移动存储设备和HID设备，对其它嵌入式usb主机驱动的开发有一定的参考意义。
The development works for USB device consists of two parts: device design and host driver.
USB设备的开发，大体可分为设备端开发和主机端开发两部分。
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