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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So every embedded device must design the special device driver in development.

因此，不同的嵌入式产品在开发时都必须设计自己的设备驱动程序。

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So every embedded device must design the special device driver in development.

因此，不同的嵌入式产品在开发时都必须设计自己的设备驱动程序。

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