实例介绍
【实例简介】USB OTG DATASHEET
【实例截图】
【核心代码】
Contents 1. Preface........................................................................................................ vii 1.1 Intellectual Property Disclaimer ........................................................... vii 1.2 Contributors .......................................................................................... vii 1.3 Scope of this Revision.......................................................................... viii 1.4 Revision History .................................................................................. viii 1.5 Document Conventions.......................................................................... ix 2. Introduction .................................................................................................. 1 2.1 Scope....................................................................................................... 1 2.2 Purpose.................................................................................................... 2 2.3 Related Documents ................................................................................. 3 3. Management Overview ................................................................................ 4 4. Functional Characteristics ............................................................................ 7 4.1 The HID Class......................................................................................... 7 4.2 Subclass................................................................................................... 8 4.3 Protocols.................................................................................................. 9 4.4 Interfaces............................................................................................... 10 4.5 Device Limitations................................................................................ 11 5. Operational Model...................................................................................... 12 5.1 Device Descriptor Structure.................................................................. 12 5.2 Report Descriptors ................................................................................ 14 5.3 Generic Item Format ............................................................................. 14 5.4 Item Parser ............................................................................................ 15 5.5 Usages ................................................................................................... 17 5.6 Reports .................................................................................................. 17 5.7 Strings ................................................................................................... 18 5.8 Format of Multibyte Numeric Values ................................................... 19 5.9 Orientation ............................................................................................ 20 5.10 Null Values ....................................................................................... 20 6. Descriptors.................................................................................................. 21 6.1 Standard Descriptors ............................................................................. 21 6.2 Class-Specific Descriptors .................................................................... 21 6.2.1 HID Descriptor.............................................................................. 22 6.2.2 Report Descriptor.......................................................................... 23 6.2.2.1 Items Types and Tags............................................................ 26 6.2.2.2 Short Items ............................................................................ 26 iv Contents 6/27/00: 6.2.2.3 Long items............................................................................. 27 6.2.2.4 Main Items ............................................................................ 28 6.2.2.5 Input, Output, and Feature Items........................................... 29 6.2.2.6 Collection, End Collection Items .......................................... 33 6.2.2.7 Global Items.......................................................................... 35 6.2.2.8 Local Items............................................................................ 39 6.2.2.9 Padding.................................................................................. 42 6.2.3 Physical Descriptors...................................................................... 43 7. Requests ..................................................................................................... 48 7.1 Standard Requests................................................................................. 48 7.1.1 Get_Descriptor Request ................................................................ 49 7.1.2 Set_Descriptor Request................................................................. 50 7.2 Class-Specific Requests ........................................................................ 50 7.2.1 Get_Report Request ...................................................................... 51 7.2.2 Set_Report Request....................................................................... 52 7.2.3 Get_Idle Request........................................................................... 52 7.2.4 Set_Idle Request ........................................................................... 52 7.2.5 Get_Protocol Request ................................................................... 54 7.2.6 Set_Protocol Request .................................................................... 54 8. Report Protocol .......................................................................................... 55 8.1 Report Types......................................................................................... 55 8.2 Report Format for Standard Items......................................................... 55 8.3 Report Format for Array Items.............................................................. 56 8.4 Report Constraints ................................................................................ 57 8.5 Report Example..................................................................................... 57 Appendix A: Usage Tags...................................................................................... 59 Appendix B: Boot Interface Descriptors.............................................................. 59 B.1 Protocol 1 (Keyboard)............................................................................... 59 B.2 Protocol 2 (Mouse) ................................................................................... 61 Appendix C: Keyboard Implementation ............................................................... 62 Appendix D: Example Report Descriptors ........................................................... 64 D.1 Example Joystick Descriptor .................................................................... 64 Appendix E: Example USB Descriptors for HID Class Devices.......................... 66 E.1 Device Descriptor...................................................................................... 66 E.2 Configuration Descriptor .......................................................................... 67 E.3 Interface Descriptor (Keyboard) ............................................................... 67 E.4 HID Descriptor (Keyboard)....................................................................... 68 E.5 Endpoint Descriptor (Keyboard)............................................................... 68 E.6 Report Descriptor (Keyboard)................................................................... 69 Contents v 6/277/00: E.7 Interface Descriptor (Mouse) .................................................................... 70 E.8 HID Descriptor (Mouse) ........................................................................... 70 E.9 Endpoint Descriptor (Mouse).................................................................... 70 E.10 Report Descriptor (Mouse)...................................................................... 71 E.11 String Descriptors.................................................................................... 72 Appendix F: Legacy Keyboard Implementation................................................... 73 F.1 Purpose ...................................................................................................... 73 F.2 Management Overview ............................................................................. 73 F.3 Boot Keyboard Requirements ................................................................... 74 F.4 Keyboard: Non-USB Aware System Design Requirements...................... 75 F.5 Keyboard: Using the Keyboard Boot Protocol.......................................... 75 Appendix G: HID Request Support Requirements ............................................... 78 Appendix H: Glossary Definitions........................................................................ 79
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