216 lines
13 KiB
HTML
216 lines
13 KiB
HTML
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<!DOCTYPE html>
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<html class="writer-html5" lang="en" data-content_root="../">
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<head>
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<title>USB 枚举 — CherryUSB 1.5.3 documentation</title>
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CherryUSB
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<p class="caption" role="heading"><span class="caption-text">快速上手</span></p>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../quick_start/start.html">入门必看</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../quick_start/demo.html">基于现有 demo 快速验证</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../quick_start/transplant.html">芯片通用移植指南</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../quick_start/rtthread.html">基于 RT-Thread 软件包开发指南</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../quick_start/opensource.html">官方开源项目分享</a></li>
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</ul>
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<p class="caption" role="heading"><span class="caption-text">USB 基本知识点</span></p>
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<ul class="current">
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<li class="toctree-l1"><a class="reference internal" href="usb2.0_basic.html">USB 基本概念(2.0 为主)</a></li>
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<li class="toctree-l1"><a class="reference internal" href="usb3.0_basic.html">USB 基本概念(3.0 为主)</a></li>
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<li class="toctree-l1"><a class="reference internal" href="usb_desc.html">USB 描述符</a></li>
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<li class="toctree-l1"><a class="reference internal" href="usb_request.html">USB 设备请求</a></li>
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<li class="toctree-l1 current"><a class="current reference internal" href="#">USB 枚举</a></li>
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<li class="toctree-l1"><a class="reference internal" href="usb_ext.html">USB 知识点拓展</a></li>
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</ul>
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<p class="caption" role="heading"><span class="caption-text">API 手册</span></p>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../api/api_device.html">设备协议栈</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../api/api_host.html">主机协议栈</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../api/api_port.html">主从驱动</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../api/api_config.html">USB CONFIG 说明</a></li>
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</ul>
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<p class="caption" role="heading"><span class="caption-text">Class 指南</span></p>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../class/class_cdc.html">CDC</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../class/class_hid.html">HID</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../class/class_msc.html">MSC</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../class/class_audio.html">UAC</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../class/class_video.html">UVC</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../class/winusb.html">WINUSB</a></li>
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</ul>
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<p class="caption" role="heading"><span class="caption-text">例程说明</span></p>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../demo/usbd_cdc_acm.html">usbd_cdc_acm</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../demo/usbd_hid.html">usbd_hid</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../demo/usbd_msc.html">usbd_msc</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../demo/usbd_rndis.html">usbd_rndis</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../demo/usbd_ecm.html">usbd_cdc_ecm</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../demo/usbd_audiov1.html">usbd_audiov1</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../demo/usbd_audiov2.html">usbd_audiov2</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../demo/usbd_video.html">usbd_video</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../demo/usbd_winusb.html">usbd_winusb</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../demo/usbd_webusb.html">usbd_webusb</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../demo/usbd_adb.html">usbd_adb</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../demo/usbh_serial.html">usbh_serial</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../demo/usbh_hid.html">usbh_hid</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../demo/usbh_msc.html">usbh_msc</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../demo/usbh_net.html">usbh_net</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../demo/usbh_bluetooth.html">usbh_bluetooth</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../demo/usbh_wifi.html">usbh_wifi</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../demo/usbd_vendor.html">vendor device 驱动编写</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../demo/usbh_vendor.html">vendor host 驱动编写</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../demo/usb_otg.html">OTG 功能的使用</a></li>
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</ul>
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<p class="caption" role="heading"><span class="caption-text">USBIP 介绍</span></p>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../usbip/ohci.html">OHCI</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../usbip/ehci.html">EHCI</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../usbip/xhci.html">XHCI</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../usbip/chipidea.html">CHIPIDEA</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../usbip/dwc2.html">DWC2</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../usbip/musb.html">MUSB</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../usbip/fotg210.html">FOTG210</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../usbip/cdns2.html">CDNS2</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../usbip/cdns3.html">CDNS3</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../usbip/dwc3.html">DWC3</a></li>
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</ul>
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<p class="caption" role="heading"><span class="caption-text">工具使用</span></p>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../tools/index.html">chryusb_configurator</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../tools/index.html#usb-protocol-suite">力科 USB Protocol Suite</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../tools/index.html#wireshark">Wireshark</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../tools/index.html#audacity">Audacity</a></li>
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</ul>
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<p class="caption" role="heading"><span class="caption-text">版本说明</span></p>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../version.html">版本说明</a></li>
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</ul>
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<p class="caption" role="heading"><span class="caption-text">性能展示</span></p>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../show/index.html">性能展示</a></li>
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</ul>
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<p class="caption" role="heading"><span class="caption-text">商业支持</span></p>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../support/index.html">商业支持</a></li>
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</ul>
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</div>
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</div>
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</nav>
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<section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"><nav class="wy-nav-top" aria-label="Mobile navigation menu" >
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<a href="../index.html">CherryUSB</a>
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</nav>
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<div class="wy-nav-content">
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<div class="rst-content">
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<div role="navigation" aria-label="Page navigation">
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<ul class="wy-breadcrumbs">
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<li><a href="../index.html" class="icon icon-home" aria-label="Home"></a></li>
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<li class="breadcrumb-item active">USB 枚举</li>
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<li class="wy-breadcrumbs-aside">
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<a href="../_sources/usb/usb_enum.rst.txt" rel="nofollow"> View page source</a>
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<hr/>
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</div>
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<div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article">
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<div itemprop="articleBody">
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<section id="usb">
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<h1>USB 枚举<a class="headerlink" href="#usb" title="Link to this heading"></a></h1>
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<p>当我们了解了 usb 设备请求以后，就可以来学习下 USB 设备的整个枚举过程了，看看是如何枚举出一个串口、鼠标、u盘等设备了。枚举过程中主机会发送设备请求来获取相关信息（也就是描述符），具体发送哪些，参考下图。</p>
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<figure class="align-default">
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<img alt="../_images/usb_enum.png" src="../_images/usb_enum.png" />
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</figure>
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<ul class="simple">
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<li><p>首先设备接上 USB 线，然后插上电脑</p></li>
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<li><p>设备插上以后上电，处于供电状态</p></li>
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<li><p>主机通过 D+/D- 识别到设备插入</p></li>
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<li><p>对设备进行复位</p></li>
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<li><p>主机发送 <strong>获取设备描述符请求</strong></p></li>
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<li><p>可选的复位操作</p></li>
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<li><p>主机发送 <strong>设置设备地址请求</strong></p></li>
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<li><p>主机发送 <strong>获取配置描述符请求</strong>，可能会获取多次，无所谓</p></li>
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<li><p>主机发送 <strong>获取字符串描述符请求</strong>，正常会获取3个字符串，如果后面的描述符中指定了字符串，则继续获取指定的字符串</p></li>
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<li><p>主机发送 <strong>获取设备限定描述符请求</strong>，用来获取在设备工作在其他速度上的请求，如果设备只能工作在全速模式，则必须回复 stall，并且协议栈中一定会打印该请求告诉你此命令设备不支持。</p></li>
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<li><p>主机发送 <strong>设置配置请求</strong>，对设备的端点进行配置，通常是根据端点描述符中的配置进行设置。</p></li>
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<li><p>到此标准的设备请求结束</p></li>
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<li><p>主机根据接口描述符加载对应支持的 class 驱动，如果主机不支持，则会提示该设备找不到驱动</p></li>
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<li><p>加载完成以后，开始执行该 class 相关的请求</p></li>
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<li><p>最终进行 class 的数据流传输</p></li>
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</ul>
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</section>
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</div>
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</div>
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<footer><div class="rst-footer-buttons" role="navigation" aria-label="Footer">
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<a href="usb_request.html" class="btn btn-neutral float-left" title="USB 设备请求" accesskey="p" rel="prev"><span class="fa fa-arrow-circle-left" aria-hidden="true"></span> Previous</a>
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<a href="usb_ext.html" class="btn btn-neutral float-right" title="USB 知识点拓展" accesskey="n" rel="next">Next <span class="fa fa-arrow-circle-right" aria-hidden="true"></span></a>
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</div>
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<p>© Copyright 2022 ~ 2025, sakumisu.</p>
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