| With the applying of embedded technology widely, more and more embedded devices need one or several network communication interface. Because Linux has good open style and USB has excellent generalization, USB equipments get extensive application in Linux operation system. Studying and developing of embedded Linux have been becoming a disquisitive hotspot in the field of embedded system, and to develop communication interface driver such as USB driver under embedded system is a highly significant job.Firstly, the paper gave a brief description of the development of embedded system, and introduced the general architecture of the embedded communication platform developed by ourselves. The method of designing communication interface driver under embedded system was brought forward.Secondly, base on the embedded Linux operating system, the paper analyzed the relation of operating system kernel and the driver, the principle of developing device deliver and the method of debugging device driver under this operating system were given.And then, by deeply studying on USB system architecture, the USB system of Motorola PowerPC 850 was designed and realized under embedded Linux operating system on this platform. The hardware interface circuit of USB system was designed, and the driver of USB host controller of Motorola PowerPC 850 was programmed.Finally, the concept of USB device class was introduced, the driver of U disk under embedded Linux system was realized, and the method of loading a USB device driver under embedded system was summarized.
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