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研究生： 陳仕杰
Chen, Shih-Chieh
論文名稱： 建構於USB On-The-Go之多媒體播放器應用實作
The Implementation of a USB On-The-Go Multimedia Player
指導教授： 楊中平
Young, Chung-Ping
學位類別： 碩士
Master
系所名稱： 電機資訊學院 - 資訊工程學系
Department of Computer Science and Information Engineering
論文出版年： 2007
畢業學年度： 95
語文別： 英文
論文頁數： 100
中文關鍵詞： On-The-Go 、通用序列匯流排 、USB 、Dual-role Device
外文關鍵詞： USB, OTG, Dual-role device, On-The-Go
相關次數： 點閱：105  下載：1 
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    • 自從面世以來，通用序列匯流排(USB)獲得了相當巨大的成功。目前所有與電腦相連接的外部裝置，幾乎都能找到支援USB的版本。由於其具有統一的溝通介面、支援隨插即用、良好的擴充性及價格低廉，讓越來越多的主機與消費性電子產品樂於支援USB介面。主從式的設計，讓主機端控制所有傳輸的進行，而周邊裝置只需要回應主機的需求即可，進而簡化裝置端的設計與製造成本。先天上的設計使得周邊裝置本身無法直接與另一周邊裝置交換資料，因此USB Implementers Forum頒布了On-The-Go補充協議。基於這份協議所設計出來的周邊裝置，能夠在外部裝置上實現有限主機能力，進而達到裝置對裝置的資料傳遞，而不需透過主機的協助。本篇論文採用Cypress的CY3663開發平台，實現了一個雙重角色的OTG裝置(Dual-role Device)。其中包含設計韌體層，撰寫主機端驅動程式、裝置端驅動程式以及用來驗證該裝置是否支援雙重角色的應用程式。為了測試該裝置的各種角色功能，我們設計了三個情境來測試，作為Host角色時，OTG裝置與一般的隨身碟或其他支援OTG的 Mass storage裝置連接，並支援USB speaker播放音訊；作為Device角色時，則可連接傳統的電腦主機，讓主機識別該裝置為符合Mass storage class Bulk-only的裝置；最後的情境則利用了巨盛公司所開發的OXDK3800平台，驗證我們的裝置是否能支援SRP與HNP，達到不需重新拔插連接線就能使彼此的角色互換。

    Since has appeared on the market, the Universal Serial Bus (USB) has obtained the quite huge success. Nearly all of the exterior equipments use USB to communicate with computer. Because it has the unitary communication interface, the support of hot plug, good extensibility and the inexpensive price, more and more host computers and the consumer electronic products consider USB interface as necessary. The master/slave architecture makes the host computer to be in charge of all the communications and the device just need to answer these requests. Therefore the device can be very simple and cheap. The congenital on design causes to the peripheral device is unable to exchange data with another peripheral device. As a result, the USB Implementers Forum has promulgated the On-The-Go subsidiary agreement. Peripheral which is based on this supplement implements the restricted host abilities and then achieve information transmission between peripherals. In this thesis, we use Cypress CY3663 development platform to implement an OTG dual-role device. The work encompasses the firmware layer design, host drivers design, peripheral device driver design, and the upper applications which are used to confirm the device. We designed three scenarios to test the device. In the first scenario, the device plays the host role and can support legacy mass storage device and USB speaker. In the second scenario, the device plays the peripheral role and can be considered as a mass storage device when connects to a desktop computer. In the final scenario, we test the OTG capability by connecting the device to the Chesen OXDK3800 and change their roles without reverse the cable. Therefore the capabilities of SRP and HNP of the device can be verified.

    Chapter 1 Introduction 1 1.1 Introduction 1 1.2 Motivation 3 1.3 Overview of This Thesis 3 Chapter 2 Related works 4 2.1 Chesen OTG eXpress Development Kit (OXDK) 6 2.2 Atmel AT90USBKey Evaluation Kit 7 2.3 Other OTG Solution Chips 8 2.3.1 Genesys Logic GL824/824C 8 2.3.2 Philips ISP1761 9 Chapter 3 Background Knowledge Materials 11 3.1 Universal Serial Bus 11 3.1.1 Physical Connection 11 3.1.2 Abstract Logical Connection 12 3.1.3 Data Transfer Fundamentals 16 3.1.4 Device Classifications 19 3.1.5 USB OTG Supplements 20 3.1.6 Session Request Protocol 28 3.1.7 Host Negotiation Protocol 29 3.1.8 OTG device State Machines 31 Chapter 4 The Environment of Experimentations 39 4.1 Cypress CY3663 Development Kit 39 4.1.1 Hardware Architecture 40 4.2 Software Architecture 44 4.2.1 BIOS Functionalities 44 4.2.2 Firmware Development 47 4.2.3 Frameworks Subsystem 49 4.2.4 An example of host application 50 4.3 USB Subsystem under Linux 54 4.3.1 USB Host Stack 55 4.3.1.1 USB Core Layer 55 4.3.1.2 USB Host Controller Driver 57 4.3.2 Peripheral Driver Model 59 Chapter 5 Implementations 66 5.1 Preparation 66 5.1.1 Rebuild the Linux system 66 5.1.1.1 Modular support 67 5.1.1.2 PROC File System 68 5.1.1.3 Hot-plugging support 68 5.1.2 Overall System Layout 69 5.2 OTG Device acts as the Host 70 5.2.1 Execution details 71 5.2.2 Summary 72 5.3 OTG Device acts as the Peripheral 73 5.3.1 Storage Function Driver 73 5.3.2 Execution details 76 5.3.3 Summary 78 5.4 Exchanging Roles between OTG Devices 79 5.4.1 OTG-Manager Layer 79 5.4.2 Execution details 80 5.4.3 Summary 84 5.5 Performance of Peripheral Device Driver 85 5.5.1 ATTO Disk Benchmark 86 5.5.2 HD Tune 88 5.5.3 FDBENCH benchmark 89 5.5.4 hdparam 90 5.6 Test for OTG On-Line Role Exchanging 91 Chapter 6 Conclusions and Future work 94

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