在ubuntu18.04系统；利用V4L2采集两个usb摄像头数据，在QT上控件显示两个采集的视频流。可以同时采集两个相机。
在QT下调用V4L2的库函数来实现采集视频流。并且把采集到的视频流在控件上显示出来。
相机输出格式可以设置为JPEG(V4L2_PIX_FMT_MJPEG)，也可设置为yuyv(V4L2_PIX_FMT_YUYV)，程序里面有介绍。 程序里面使用的是ioctl（ioctl是应用与驱动的常用接口。对字符设备、块设备、及套接字，非常方便扩充新的命令）。
QT版本（qt-opensource-linux-x64-5.13.2）。
使用了QT的线程， 相机的整个采图过程在子线程中进行，可以避免卡住主线程。
并且把抓到的图转为QImage对象，方便后续的处理，可以方便的保存为图片，例如BMP图片。
2022-06-29 09:01:28
30KB
打开和关闭电脑USB端口批处理小程序，不用设置CMOS关闭USB设备，使用后USB鼠标、USB键盘、USB打印机均可以正常使用
2022-05-27 18:36:05
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USB网络共享工具 USB共享(USB-Over-Network)4.75带注册机
2022-05-22 18:27:29
8.75MB
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stm32全系列驱动是一款官方发布的通用版USBHost驱动库，缺少该驱动库，电脑无法正常运行，小编为大家整理了详细的host移植方法，操作简单直观，需要的朋友欢迎在下载！stm32驱动介绍2014年10月5日官方最新发布的STM32全系列通用的USBHost驱动库，FORSTM3,欢迎下载体验
2022-05-01 11:54:51
3.69MB
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用于网络共享USB设备，USB共享(USB-Over-Network)5.02带注册码
2022-04-27 10:05:13
8.72MB
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圈圈教你玩USB.pdf文档扫描版，带目录，内容完整并且还附带光盘资料，本书是USB开发学习的入门书籍。
2022-03-23 14:53:15
184B
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Universal Serial Bus Type-C Cable and Connector Specification
Release 1.3 July 14, 2017
CONTENTS
Specification Work Group Chairs / Specification Editors ................................................... 11
Specification Work Group Contributors .................................................................................. 11
Pre-Release Draft Industry Reviewing Companies That Provided Feedback ................ 14
Revision History ............................................................................................................................. 14
1 Introduction ............................................................................................................................ 15
1.1 Purpose ......................................................................................................................... 15
1.2 Scope ............................................................................................................................. 15
1.3 Related Documents .................................................................................................... 16
1.4 Conventions ................................................................................................................. 16
1.4.1 Precedence .................................................................................................... 16
1.4.2 Keywords ...................................................................................................... 16
1.4.3 Numbering .................................................................................................... 17
1.5 Terms and Abbreviations ......................................................................................... 17
2 Overview ................................................................................................................................. 21
2.1 Introduction ................................................................................................................ 21
2.2 USB Type-C Receptacles, Plugs and Cables ......................................................... 22
2.3 Configuration Process ............................................................................................... 23
2.3.1 Source-to-Sink Attach/Detach Detection .............................................. 24
2.3.2 Plug Orientation/Cable Twist Detection ............................................... 24
2.3.3 Initial Power (Source-to-Sink) Detection and Establishing the Data
(Host-to-Device) Relationship ................................................................. 24
2.3.4 USB Type-C VBUS Current Detection and Usage .................................. 25
2.3.5 USB PD Communication ............................................................................. 25
2.3.6 Functional Extensions ................................................................................ 26
2.4 VBUS ............................................................................................................................... 26
2.5 VCONN ............................................................................................................................. 27
2.6 Hubs ............................................................................................................................... 27
3 Mechanical ............................................................................................................................... 28
3.1 Overview ...................................................................................................................... 28
3.1.1 Compliant Connectors................................................................................ 28
3.1.2 Compliant Cable Assemblies .................................................................... 28
3.1.3 Compliant USB Type-C to Legacy Cable Assemblies .......................... 28
3.1.4 Compliant USB Type-C to Legacy Adapter Assemblies ..................... 29
3.2 USB Type-C Connector Mating Interfaces ............................................................ 29
3.2.1 Interface Definition .................................................................................... 29
3.2.2 Reference Designs ....................................................................................... 52
3.2.3 Pin Assignments and Descriptions ......................................................... 59
3.3 Cable Construction and Wire Assignments ......................................................... 60
3.3.1 Cable Construction (Informative) ........................................................... 60
3.3.2 Wire Assignments ....................................................................................... 62
3.3.3 Wire Gauges and Cable Diameters (Informative) ............................... 63
3.4 Standard USB Type-C Cable Assemblies .............................................................. 65
3.4.1 USB Full-Featured Type-C Cable Assembly .......................................... 65
3.4.2 USB 2.0 Type-C Cable Assembly .............................................................. 66
3.4.3 USB Type-C Captive Cable Assemblies .................................................. 67
3.5 Legacy Cable Assemblies .......................................................................................... 67
3.5.1 USB Type-C to USB 3.1 Standard-A Cable Assembly .......................... 68
3.5.2 USB Type-C to USB 2.0 Standard-A Cable Assembly .......................... 69
3.5.3 USB Type-C to USB 3.1 Standard-B Cable Assembly .......................... 70
3.5.4 USB Type-C to USB 2.0 Standard-B Cable Assembly .......................... 71
3.5.5 USB Type-C to USB 2.0 Mini-B Cable Assembly ................................... 72
3.5.6 USB Type-C to USB 3.1 Micro-B Cable Assembly ................................. 73
3.5.7 USB Type-C to USB 2.0 Micro-B Cable Assembly ................................. 75
3.6 Legacy Adapter Assemblies ..................................................................................... 76
3.6.1 USB Type-C to USB 3.1 Standard-A Receptacle Adapter Assembly 76
3.6.2 USB Type-C to USB 2.0 Micro-B Receptacle Adapter Assembly ...... 78
3.7 Electrical Characteristics ......................................................................................... 79
3.7.1 Raw Cable (Informative) ........................................................................... 79
3.7.2 USB Type-C to Type-C Passive Cable Assemblies (Normative) ....... 80
3.7.3 Mated Connector (Informative) .............................................................. 93
3.7.4 USB Type-C to Legacy Cable Assemblies (Normative) ...................... 97
3.7.5 USB Type-C to USB Legacy Adapter Assemblies (Normative) ....... 101
3.7.6 Shielding Effectiveness Requirements (Normative) ........................ 103
3.7.7 DC Electrical Requirements (Normative) ........................................... 106
3.8 Mechanical and Environmental Requirements (Normative) ........................ 109
3.8.1 Mechanical Requirements ....................................................................... 109
3.8.2 Environmental Requirements ................................................................ 115
3.9 Docking Applications (Informative) ................................................................... 116
3.10 Implementation Notes and Design Guides ........................................................ 117
3.10.1 EMC Management (Informative) ........................................................... 117
3.10.2 Stacked and Side-by-Side Connector Physical Spacing
(Informative) .............................................................................................. 120
3.10.3 Cable Mating Considerations (Informative) ...................................... 120
4 Functional .............................................................................................................................. 122
4.1 Signal Summary ........................................................................................................ 122
4.2 Signal Pin Descriptions ........................................................................................... 122
4.2.1 SuperSpeed USB Pins ............................................................................... 122
4.2.2 USB 2.0 Pins ................................................................................................ 123
4.2.3 Auxiliary Signal Pins ................................................................................ 123
4.2.4 Power and Ground Pins ........................................................................... 123
4.2.5 Configuration Pins .................................................................................... 123
4.3 Sideband Use (SBU) ................................................................................................. 123
4.4 Power and Ground ................................................................................................... 123
4.4.1 IR Drop ......................................................................................................... 123
4.4.2 VBUS ............................................................................................................... 124
... ...
2022-03-22 10:23:20
8.65MB
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LibUsbDotNet_Setup.2.2.8，是windows上用C#开发USB 通讯的一个开源库源文件。
2022-03-16 20:22:25
2.21MB
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