By studying and designing the embedded USB host, this paper expounds its working mechanism and implementation architecture, and gives the specific implementation on the software and hardware platform. First, the real-time operating system (RTOS) - μC/OS-II is transplanted on Samsung\'s ARM7 processor S3C44B0X, and then combined with the actual needs of specific medical equipment, the USB host function is realized using the SL811HS chip, and on this basis, the embedded drivers of EPSON printers and mass storage devices (U disk, mobile hard disk) with USB interface are developed. Keywords: Universal Serial Bus (USB); SL811HS; μC/OS-II; mass storage; printing language 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
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