通過研究和設計嵌入式USB 的host（主機），闡述了其工作機制和實現架構，并給出了在軟硬件平臺上的具體實現。首先，在三星的ARM7 處理器S3C44B0X 上移植了實時操作系統（RTOS）——μC/OS-II，然后結合具體的醫療設備的實際需要，利用SL811HS 芯片實現了USB 主機功能，并在此基礎上開發了USB接口的EPSON 打印機、海量存儲類設備（U 盤，移動硬盤）的嵌入式驅動程序。
關鍵詞：通用串行總線（USB）；SL811HS；μC/OS-II ；海量存儲；打印語言
Abstract：In this paper, the principle of Embedded USB(Universal Serial Bus) host is deeply researched, and the mechanism and architecture of USB host are expounded, and the practical example based on the Software-Hardware platform is given. First, we transplant μC/ OS-II on the ARM processor S3C44B0X,then, combining the research of the medicine device , the communication of USB host is realized though SL811HS, at last, the drivers of mass storage device and EPSON printer based on USB are developed.
Key words： Universal Serial Bus(USB);SL811HS,μC/OS-II; mass storage；printer language