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<li class="toctree-l1 current"><a class="current reference internal" href="#">OTG 功能的使用</a></li>
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<section id="otg">
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<h1>OTG 功能的使用<a class="headerlink" href="#otg" title="Link to this heading"></a></h1>
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<p>如果需要使用 OTG 功能，首先使用的芯片需要支持 ID 检测功能，然后使能 <code class="docutils literal notranslate"><span class="pre">CONFIG_USB_OTG_ENABLE</span></code> 宏，将之前的例程中 <code class="docutils literal notranslate"><span class="pre">usbh_initialize</span></code> 或者 <code class="docutils literal notranslate"><span class="pre">usbh_initialize</span></code>
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替换成 <code class="docutils literal notranslate"><span class="pre">usbotg_initialize</span></code> 即可。</p>
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<p>ID 检测电路根据不同的 USB 接口类型有所不同，常见的有 micro-USB 和 USB-C 两种接口类型。</p>
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<ul class="simple">
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<li><p>如果是 micro-USB 接口，则将 ID 线连接到芯片的 ID 引脚，并使能 ID 功能即可。</p></li>
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<li><p>如果是 USB-C 接口，由于没有 ID 引脚，则需要借助 CC 电路转换成 ID 然后连接到芯片的 ID 引脚，常见电路图如下所示（DNP 表示不焊接）：</p></li>
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</ul>
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<figure class="align-default">
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<img alt="../_images/otg.png" src="../_images/otg.png" />
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</figure>
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<div class="admonition note">
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<p class="admonition-title">Note</p>
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<p>除 ID 引脚以外，还需要增加 VBUS 输出开关控制，当工作在 host 时，开启 VBUS 供电，当工作在 device 时，关闭 VBUS 供电。</p>
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