現代作業系統的主要工作之一是提供一個介面給應用程式和使用者與周邊設備相互作用。通用序列匯流排比序列和並列介面於周邊介面擁有更多的優勢。因為通用序列匯流排特殊的特性，像是熱插拔、增加果大周邊數量的可能性，使得通用序列匯流排在嵌入式系統中越來越收歡迎。在這篇論文中，我們實作通用序列匯流排協定層堆疊以及增進主機控制器驅動程式在即時核心作業系統MicroC/OS-II中。我們也實作通用序列匯流排電源管理，因為電源消耗在嵌入式系統是敏感的。所有連接在系統上的通用序列匯流排設備進入休眠狀態當沒有任何的傳輸在通用序列匯流上。由於更錯綜複雜的拓普結構以及需要支援如同電源管理的特徵，一種描述一般抽象結構的理念將被更新的嵌入式系統所需要。也因此，嵌入式驅動程式模型被提出和實現。系統開發者將透過嵌入式驅動程式模型簡單且有效的管理在系統上的匯流排、設備以及驅動程式。這將使得整個系統更加有組織的去處理相關周邊的物件。

One of the main tasks of modern operating system is to provide an interface to applications and the users to interact with peripheral devices. In the area USB is getting more advantages than serial and parallel interface. Because of its special properties, like hot-plugging and the possibility to simply enlarge the number of attached device, USB is more and more popular in many embedded systems. In this thesis, we implemented the USB Host Protocol Stack and the Enhanced HCD for the USB 2.0 in the Real-Time kernel MicroC/OS-II. We also implemented the power management of USB because of the power consumption is sensitive in the embedded system. All of the USB devices which attached in the system enter its suspended state when there is no traffic in the USB bus. The demands of newer embedded system, with their more complicated topologies and need to support features such as power management, made it clear, however, that a general abstraction describing the structure was needed. Therefore the embedded driver model was proposed and implemented. It is efficiently and easily for the system developer to manage bus, device and driver in the system by the embedded driver model. It made the whole system more organized in this will to deal with peripheral objects.

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