个人觉得很经典的入门教材 来自 http://www.beyondlogic.org/usbnutshell/usb1.shtml USB in a NutShellMaking sense of the USB standard Starting out new with USB can be quite daunting. With the USB 2.0 specification at 650 pages one could easily be put off just by the sheer size of the standard. This is only the beginning of a long list of associated standards for USB. There are USB Class Standardssuch as the HID Class Specification which details the common operation of devices (keyboards, mice etc) falling under the HID (Human Interface Devices) Class - only another 97 pages. If you a

http://www.beyondlogic.org/usbnutshell/usb3.shtml usb protocol的Package简单介绍 Unlike RS-232 and similar serial interfaces where the format of data being sent is not defined, USB is made up of several layers of protocols. While this sounds complicated, don’t give up now. Once you understand what is going on, you really only have to worry about the higher level layers. In fact most USB controller I.C.s will take care of the lower layer, thus making it almost invisible to the end designer. Each USB transaction consists of a Token Packet (Header defining what it expects to follow), an Opt

USB/UVC/UAC/HID开发者的福利,USB中文网，里面有很多的USB规范，调试记录分析等。 "USB技术开发,USB摄像头,USB音视频开发,UAC音频声卡麦克风规格书,USBIP,USB社区技术问答,HID规范,报告描述符分析,技术培训，BUSHOUND抓包分析,USB代码分享，USB开发工具，驱动编程，技术博客分享。 http://www.usbzh.com/

当你起身去上厕所或者喝水的时候，是否可曾担心屏幕上的信息被人有意或者无意的看到？或者你外出办事，是否担心有人悄悄操作你的电脑？解决这个问题最简单的办法就是给Windows设置一个密码，然后在离开的时候按下 WinKey+L 。 下面就来使用Arduino制作一个自动完成这个“人走屏锁”的装置。 简单的说，工作分为两步：第一步，制作Arduino模拟USB键盘；第二步，让这个模拟键盘发出WinKey+L的键码。 使用的BOM如下： A.USB公头(有供电和通讯能力的USB头

麻烦大神给看看，我用6018a写EEPROM怎么一直是写不进去，代码如下： BYTE xdata iicsed[10] = {0,1,2,3,4,4,3,7,8,9}; BYTE xdata iicrec[10] = {0,};

还有能不能判断写入缓冲区数据的数量？

小弟最近开始学习U盘的开发，自己分工需要负责写上位机的部分，自定义HID类的我有思路去写了，不过U盘的接口函数貌似跟HID类的不一样。网上也找不到资

http://www.beyondlogic.org/usbnutshell/usb2.shtml 对于软件工程师来说，这一章并非必须；但是对于 Firmware 工程师来说，了解这些是非常必要的。 Connectors All devices have an upstream connection to the host and all hosts have a downstream connection to the device. Upstream and downstream connectors are not mechanically interchangeable, thus eliminating illegal loopback connections at hubs such as a downstream port connected to a downstream port. There are commonly two types of connectors, called type A and type B which are shown below. Type A USB Connector Typ

有人提了这么一个问题： USB芯片PDIUSBD12读CHIP ID命令在手册中怎么找不到？ 刚开始我以为只是没有拿到完整版的手册，后来找了一份比较新的结果里面也没有 PDIUSBD12D-0.9 遇到这样的情况，通常是要去找找 AP　Note，找了一下还真找到了 What is the command to read the chip ID of the PDIUSBD12 and what is the chip ID? The command to read the chip ID of the PDIUSBD12 is FDh and the expected value is 1012h. PDIUSBD12_FAQ 来源：http://www.lab-z.com/d12usb0xfd/

D12是一款很常见的USB芯片，非常适合与单片机配合使用 《圈圈教你玩USB》配合的开发板就使用了这颗IC来实现USB的功能

三本Spec，个人感觉完全可以用1.1开始阅读 USB 1.1 USB 2.0 USB 3.0

电路图如下（更详细请参考附件） 实物图（具体可能会和你拿到手中的有一些差别）

第一篇 2014-06-14

亲爱的各位吧友：欢迎来到usb开发