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<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-cn" lang="zh-cn" data-whc_version="26.0">
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<head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/><meta name="viewport" content="width=device-width, initial-scale=1.0"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><meta name="description" content="USB 设备枚举总体流程是让 Host 认得这个 USB 设备，并且为该设备准备资源，建立好主机和设备之间的数据传递机制。一个设备枚举的过程分为如下 8 步： 获取设备描述符 Host/Hub 通过数据线上拉电阻的阻值变化检测到新设备接入。Host 等待 100ms 以保证设备电源稳定。 Host 向 device 发 Bus Reset 使得设备进入 default ..."/><meta name="DC.rights.owner" content="(C) 版权 2025"/><meta name="copyright" content="(C) 版权 2025"/><meta name="generator" content="DITA-OT"/><meta name="DC.type" content="concept"/><meta name="DC.contributor" content="yan.wang"/><meta name="DC.date.modified" content="2024-02-04"/><meta name="DC.format" content="HTML5"/><meta name="DC.identifier" content="usb_枚举流程"/><meta name="DC.language" content="zh-CN"/><title>枚举流程</title><!-- Build number 2023110923. --><meta name="wh-path2root" content="../../../"/><meta name="wh-toc-id" content=""/><meta name="wh-source-relpath" content="topics/sdk/usb/usb-listing-procedure.dita"/><meta name="wh-out-relpath" content="topics/sdk/usb/usb-listing-procedure.html"/>
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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic concept/concept topic concept" role="article" aria-labelledby="ariaid-title1"><span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/usb/usb-listing-procedure.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">枚举流程</h1><div class="date inPage">4 Feb 2024</div><div style="color: gray;">
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Read time: 1 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><div class="- topic/p p" data-ofbid="d74753e22__20250121171523">USB 设备枚举总体流程是让 Host 认得这个 USB 设备，并且为该设备准备资源，建立好主机和设备之间的数据传递机制。一个设备枚举的过程分为如下 8 步：<ol class="- topic/ol ol" id="usb_枚举流程__ol_sdp_hgq_g1c" data-ofbid="usb_枚举流程__ol_sdp_hgq_g1c"><li class="- topic/li li" data-ofbid="d74753e25__20250121171523">
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<p class="- topic/p p" data-ofbid="d74753e27__20250121171523">获取设备描述符</p>
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<ul class="- topic/ul ul" id="usb_枚举流程__ul_tdp_hgq_g1c" data-ofbid="usb_枚举流程__ul_tdp_hgq_g1c"><li class="- topic/li li" data-ofbid="d74753e31__20250121171523">
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<p class="- topic/p p" data-ofbid="d74753e33__20250121171523">Host/Hub 通过数据线上拉电阻的阻值变化检测到新设备接入。Host 等待 100ms 以保证设备电源稳定。</p>
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</li><li class="- topic/li li" data-ofbid="d74753e36__20250121171523">
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<p class="- topic/p p" data-ofbid="d74753e38__20250121171523">Host 向 device 发 Bus Reset 使得设备进入 default 状态，从此之后，设备可以响应默认地址 0。</p>
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</li><li class="- topic/li li" data-ofbid="d74753e41__20250121171523">
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<p class="- topic/p p" data-ofbid="d74753e43__20250121171523">Host 请求 Device 发送 Device Descriptor 的前 64 个字节。</p>
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</li></ul>
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</li><li class="- topic/li li" data-ofbid="d74753e47__20250121171523">
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<p class="- topic/p p" data-ofbid="d74753e49__20250121171523">复位</p>
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<ul class="- topic/ul ul" id="usb_枚举流程__ul_udp_hgq_g1c" data-ofbid="usb_枚举流程__ul_udp_hgq_g1c"><li class="- topic/li li" data-ofbid="d74753e53__20250121171523">
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<p class="- topic/p p" data-ofbid="d74753e55__20250121171523">Host 在收到 Device Descritptor 的前 8 个字节后，再次向 Device 发出 Bus Reset。</p>
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</li></ul>
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</li><li class="- topic/li li" data-ofbid="d74753e59__20250121171523">
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<p class="- topic/p p" data-ofbid="d74753e61__20250121171523">设置地址</p>
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<ul class="- topic/ul ul" id="usb_枚举流程__ul_vdp_hgq_g1c" data-ofbid="usb_枚举流程__ul_vdp_hgq_g1c"><li class="- topic/li li" data-ofbid="d74753e65__20250121171523">
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<p class="- topic/p p" data-ofbid="d74753e67__20250121171523">Host 发送一个 Set Address 命令给 Deivce，从此 Device 有个通信地址，不再使用默认地址 0
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进行通信。</p>
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</li></ul>
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</li><li class="- topic/li li" data-ofbid="d74753e71__20250121171523">
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<p class="- topic/p p" data-ofbid="d74753e73__20250121171523">再次获取设备描述符</p>
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<ul class="- topic/ul ul" id="usb_枚举流程__ul_wdp_hgq_g1c" data-ofbid="usb_枚举流程__ul_wdp_hgq_g1c"><li class="- topic/li li" data-ofbid="d74753e77__20250121171523">
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<p class="- topic/p p" data-ofbid="d74753e79__20250121171523">Host 请求获取完整的 Device Descritpor, 总计 18 字节。</p>
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</li></ul>
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</li><li class="- topic/li li" data-ofbid="d74753e83__20250121171523">
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<p class="- topic/p p" data-ofbid="d74753e85__20250121171523">获取配置描述符</p>
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<ul class="- topic/ul ul" id="usb_枚举流程__ul_xdp_hgq_g1c" data-ofbid="usb_枚举流程__ul_xdp_hgq_g1c"><li class="- topic/li li" data-ofbid="d74753e89__20250121171523">
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<p class="- topic/p p" data-ofbid="d74753e91__20250121171523">Host 请求获取 9 个字节的 Configuration Descriptor 以了解 Configuration
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Descriptor 的总大小。</p>
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</li><li class="- topic/li li" data-ofbid="d74753e94__20250121171523">
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<p class="- topic/p p" data-ofbid="d74753e96__20250121171523">Host 请求 255 字节的 Configuration Descritpor。</p>
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</li></ul>
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</li><li class="- topic/li li" data-ofbid="d74753e100__20250121171523">
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<p class="- topic/p p" data-ofbid="d74753e102__20250121171523">获取接口，端点描述符</p>
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</li><li class="- topic/li li" data-ofbid="d74753e105__20250121171523">
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<p class="- topic/p p" data-ofbid="d74753e107__20250121171523">获取字符串描述符</p>
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</li><li class="- topic/li li" data-ofbid="d74753e110__20250121171523">
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<p class="- topic/p p" data-ofbid="d74753e112__20250121171523">选择设备配置</p>
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</li></ol></div><p class="- topic/p p" data-ofbid="d74753e115__20250121171523">下图是接入一个 USB 鼠标之后完整的枚举过程，后面详细逐步分析：</p><div class="- topic/p p" data-ofbid="d74753e117__20250121171523"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_枚举流程__image_ydp_hgq_g1c" src="../../../images/usb/mouse_enum_profile.jpg" alt="image22"/></div><br/></div></div></article></main></div>
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