Deploying to gh-pages from @ cherry-embedded/CherryUSB@8712e2c03c 🚀

2024-10-10 09:14:31 +00:00
parent 249ee43b89
commit 4d2aa4db55
71 changed files with 3469 additions and 14585 deletions
--- a/usb/usb_ext.html
+++ b/usb/usb_ext.html
@@ -1,17 +1,21 @@


 <!DOCTYPE html>
-<html class="writer-html5" lang="en">
+<html class="writer-html5" lang="en" data-content_root="../">
 <head>
-  <meta charset="utf-8" />
+  <meta charset="utf-8" /><meta name="viewport" content="width=device-width, initial-scale=1" />
+
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>USB 知识点拓展 &mdash; CherryUSB 1.4.0 documentation</title>
+      <link rel="stylesheet" type="text/css" href="../_static/pygments.css?v=80d5e7a1" />
+      <link rel="stylesheet" type="text/css" href="../_static/css/theme.css?v=e59714d7" />

  
-      <script src="../_static/jquery.js"></script>
-      <script src="../_static/underscore.js"></script>
-      <script src="../_static/doctools.js"></script>
-      <script src="../_static/language_data.js"></script>
+      <script src="../_static/jquery.js?v=5d32c60e"></script>
+      <script src="../_static/_sphinx_javascript_frameworks_compat.js?v=2cd50e6c"></script>
+      <script src="../_static/documentation_options.js?v=9172181d"></script>
+      <script src="../_static/doctools.js?v=9a2dae69"></script>
+      <script src="../_static/sphinx_highlight.js?v=dc90522c"></script>
    <script src="../_static/js/theme.js"></script>
    <link rel="index" title="Index" href="../genindex.html" />
    <link rel="search" title="Search" href="../search.html" />
@@ -38,16 +42,16 @@
  </form>
 </div>
        </div><div class="wy-menu wy-menu-vertical" data-spy="affix" role="navigation" aria-label="Navigation menu">
-              <p class="caption"><span class="caption-text">快速上手</span></p>
+              <p class="caption" role="heading"><span class="caption-text">快速上手</span></p>
 <ul>
 <li class="toctree-l1"><a class="reference internal" href="../quick_start/start.html">入门必看</a></li>
 <li class="toctree-l1"><a class="reference internal" href="../quick_start/demo.html">基于现有 demo 快速验证</a></li>
 <li class="toctree-l1"><a class="reference internal" href="../quick_start/transplant.html">芯片通用移植指南</a></li>
 <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>
 <li class="toctree-l1"><a class="reference internal" href="../quick_start/esp.html">基于 ESP-Registry 开发指南</a></li>
-<li class="toctree-l1"><a class="reference internal" href="../q&amp;a.html">Q &amp; A</a></li>
+<li class="toctree-l1"><a class="reference internal" href="../q%26a.html">Q &amp; A</a></li>
 </ul>
-<p class="caption"><span class="caption-text">USB 基本知识点</span></p>
+<p class="caption" role="heading"><span class="caption-text">USB 基本知识点</span></p>
 <ul class="current">
 <li class="toctree-l1"><a class="reference internal" href="usb2.0_basic.html">USB 基本概念(2.0 为主)</a></li>
 <li class="toctree-l1"><a class="reference internal" href="usb3.0_basic.html">USB 基本概念(3.0 为主)</a></li>
@@ -62,14 +66,14 @@
 </ul>
 </li>
 </ul>
-<p class="caption"><span class="caption-text">API 手册</span></p>
+<p class="caption" role="heading"><span class="caption-text">API 手册</span></p>
 <ul>
 <li class="toctree-l1"><a class="reference internal" href="../api/api_device.html">设备协议栈</a></li>
 <li class="toctree-l1"><a class="reference internal" href="../api/api_host.html">主机协议栈</a></li>
 <li class="toctree-l1"><a class="reference internal" href="../api/api_port.html">主从驱动</a></li>
 <li class="toctree-l1"><a class="reference internal" href="../api/api_config.html">USB CONFIG 说明</a></li>
 </ul>
-<p class="caption"><span class="caption-text">Class 指南</span></p>
+<p class="caption" role="heading"><span class="caption-text">Class 指南</span></p>
 <ul>
 <li class="toctree-l1"><a class="reference internal" href="../class/class_cdc.html">CDC</a></li>
 <li class="toctree-l1"><a class="reference internal" href="../class/class_hid.html">HID</a></li>
@@ -78,7 +82,7 @@
 <li class="toctree-l1"><a class="reference internal" href="../class/class_video.html">UVC</a></li>
 <li class="toctree-l1"><a class="reference internal" href="../class/winusb.html">WINUSB</a></li>
 </ul>
-<p class="caption"><span class="caption-text">例程说明</span></p>
+<p class="caption" role="heading"><span class="caption-text">例程说明</span></p>
 <ul>
 <li class="toctree-l1"><a class="reference internal" href="../demo/usbd_cdc_acm.html">usbd_cdc_acm</a></li>
 <li class="toctree-l1"><a class="reference internal" href="../demo/usbd_hid.html">usbd_hid</a></li>
@@ -97,7 +101,7 @@
 <li class="toctree-l1"><a class="reference internal" href="../demo/usbh_bluetooth.html">usbh_bluetooth</a></li>
 <li class="toctree-l1"><a class="reference internal" href="../demo/usbh_wifi.html">usbh_wifi</a></li>
 </ul>
-<p class="caption"><span class="caption-text">USBIP 介绍</span></p>
+<p class="caption" role="heading"><span class="caption-text">USBIP 介绍</span></p>
 <ul>
 <li class="toctree-l1"><a class="reference internal" href="../usbip/ohci.html">OHCI</a></li>
 <li class="toctree-l1"><a class="reference internal" href="../usbip/ehci.html">EHCI</a></li>
@@ -110,18 +114,18 @@
 <li class="toctree-l1"><a class="reference internal" href="../usbip/cdns3.html">CDNS3</a></li>
 <li class="toctree-l1"><a class="reference internal" href="../usbip/dwc3.html">DWC3</a></li>
 </ul>
-<p class="caption"><span class="caption-text">工具使用</span></p>
+<p class="caption" role="heading"><span class="caption-text">工具使用</span></p>
 <ul>
 <li class="toctree-l1"><a class="reference internal" href="../tools/index.html">chryusb_configurator</a></li>
 <li class="toctree-l1"><a class="reference internal" href="../tools/index.html#usb-protocol-suite">力科 USB Protocol Suite</a></li>
 <li class="toctree-l1"><a class="reference internal" href="../tools/index.html#wireshark">Wireshark</a></li>
 <li class="toctree-l1"><a class="reference internal" href="../tools/index.html#audacity">Audacity</a></li>
 </ul>
-<p class="caption"><span class="caption-text">版本说明</span></p>
+<p class="caption" role="heading"><span class="caption-text">版本说明</span></p>
 <ul>
 <li class="toctree-l1"><a class="reference internal" href="../version.html">版本说明</a></li>
 </ul>
-<p class="caption"><span class="caption-text">商业支持</span></p>
+<p class="caption" role="heading"><span class="caption-text">商业支持</span></p>
 <ul>
 <li class="toctree-l1"><a class="reference internal" href="../support/index.html">商业支持</a></li>
 </ul>
@@ -150,30 +154,30 @@
          <div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article">
           <div itemprop="articleBody">
             
-  <div class="section" id="usb">
-<h1>USB 知识点拓展<a class="headerlink" href="#usb" title="Permalink to this headline">¶</a></h1>
-<div class="section" id="id1">
-<h2>什么是分包<a class="headerlink" href="#id1" title="Permalink to this headline">¶</a></h2>
+  <section id="usb">
+<h1>USB 知识点拓展<a class="headerlink" href="#usb" title="Link to this heading"></a></h1>
+<section id="id1">
+<h2>什么是分包<a class="headerlink" href="#id1" title="Link to this heading"></a></h2>
 <p>由于 USB 协议中规定了每个包的最大长度，所以当我们发送的数据长度超过了最大包长度时，就需要分包发送，这就是分包。比如 ep mps 为 64，数据长度为 129，则 USB 会按照 64 + 64 + 1 的形式传输。
 而对于 USB IP 来说，分包分为软件分包和硬件分包，软件分包就是用户代码自行分包，这种 ip 一般都使用 FIFO 来进行，因为 FIFO 深度是有限的；第二种
 则是使用硬件分包，这种 USB IP 一般带 DMA 或者描述符 DMA 功能，那么这种 IP 的效率无疑是最高的，cherryusb 中充分利用了这点，使得 USB 速度能够达到最高。</p>
 <p>对于软件分包来说，一次发送的长度即使是 16K， <strong>内部也是通过软件分包的，在这种情况下，发送长度的多少不会对速度有任何提升</strong>。
 对于硬件分包来说，发送的长度会影响速度，因为硬件分包是通过 DMA 来进行的， <strong>一次发送的长度越大，DMA 的效率就越高，速度也就越快</strong>。（当然，其他协议栈虽然使用了 dma，但是部分代码实现还是按照一个包进行，等于没用，这也是速度低的一个原因）</p>
-</div>
-<div class="section" id="id2">
-<h2>什么是短包<a class="headerlink" href="#id2" title="Permalink to this headline">¶</a></h2>
+</section>
+<section id="id2">
+<h2>什么是短包<a class="headerlink" href="#id2" title="Link to this heading"></a></h2>
 <p>在上面我们讲了分包之后，短包就是分包的最后一个包（并且长度小于 EP MPS）.比如发送 129 字节的数据，那么 USB 会按照 64 + 64 + 1 的形式传输，最后一个包是1个字节，这1个字节就是短包。</p>
-</div>
-<div class="section" id="zlp">
-<h2>什么是 ZLP<a class="headerlink" href="#zlp" title="Permalink to this headline">¶</a></h2>
+</section>
+<section id="zlp">
+<h2>什么是 ZLP<a class="headerlink" href="#zlp" title="Link to this heading"></a></h2>
 <p>ZLP，顾名思义，零长度数据包，也就是数据长度为0 的短包。是 USB 设备在数据传输结束时，如果数据长度正好是最大包长度的整数倍，那么就需要发送一个 ZLP 数据包，用来告诉对方数据传输结束。</p>
 <div class="admonition caution">
 <p class="admonition-title">Caution</p>
 <p>ZLP 功能仅限于 CONTROL 和 BULK 传输</p>
 </div>
-</div>
-<div class="section" id="id3">
-<h2>什么时候算中断完成<a class="headerlink" href="#id3" title="Permalink to this headline">¶</a></h2>
+</section>
+<section id="id3">
+<h2>什么时候算中断完成<a class="headerlink" href="#id3" title="Link to this heading"></a></h2>
 <p>从机接收：接收的长度与设置的长度相等；接收的最后一个包为短包。
 从机发送：发送的长度与设置的长度相等，如果发送的长度是 EP MPS 的整数倍，需要再发送一个 ZLP（仅限 control 和 bulk 传输）。</p>
 <p>主机接收：同从机接收
@@ -182,8 +186,8 @@
 <p class="admonition-title">Note</p>
 <p>对于从机接收，并且是 bulk 传输，接收长度通常设计为 EP MPS，以下三种情况可以修改为多个 EP MPS: 固定长度；自定义协议并携带长度（例如 MSC）; 主机手动发送 ZLP 或者短包（例如 RNDIS）</p>
 </div>
-</div>
-</div>
+</section>
+</section>


           </div>