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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-otg_configuration.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">USB OTG 配置</h1><div class="date inPage">23 Dec 2024</div><div style="color: gray;">
Read time: 4 minute(s)
</div><div class="- topic/body concept/conbody body conbody"><section class="- topic/section section" id="usb_otg_configuration__section_kvg_l3z_21c" data-ofbid="usb_otg_configuration__section_kvg_l3z_21c"><h2 class="- topic/title title sectiontitle">OTG 模式配置</h2>
<div class="- topic/p p" data-ofbid="d282322e26__20250121171752">OTG 可以配置成 <code class="+ topic/ph pr-d/codeph ph codeph">Auto 模式</code> 或者 <code class="+ topic/ph pr-d/codeph ph codeph">Manual</code> 模式 ：<ul class="- topic/ul ul" id="usb_otg_configuration__ul_k4r_hdz_21c" data-ofbid="usb_otg_configuration__ul_k4r_hdz_21c"><li class="- topic/li li" data-ofbid="d282322e35__20250121171752">
<p class="- topic/p p" data-ofbid="d282322e37__20250121171752"><code class="+ topic/ph pr-d/codeph ph codeph">Auto 模式</code>。根据 <span class="- topic/ph ph">id-pin GPIO</span> 管脚的电平来决定当前 OTG 端口工作模式为
<code class="+ topic/ph pr-d/codeph ph codeph">Host</code> / <code class="+ topic/ph pr-d/codeph ph codeph">Device</code> 。</p>
<div class="- topic/p p" data-ofbid="d282322e51__20250121171752">配置 OTG 为 Auto 模式时，id-pin 是必须要配置的，需要配置 id-pin GPIO
的名称和极性。相关 menuconfig
配置：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_otg_configuration__codeblock_thv_sv3_zbc" data-ofbid="usb_otg_configuration__codeblock_thv_sv3_zbc">&gt; Local packages options
&gt; Third-party packages options
[*] CherryUSB: tiny and portable USB host/device stack <strong class="hl-keyword">for</strong> embedded system with USB IP ---&gt;
[*] Enable usb otg mode ---&gt;
Select otg <strong class="hl-keyword">switch</strong> (Auto (Id pin detect)) ---&gt;
-*- Using id-pin gpio ---&gt;
(PF.<span class="hl-number">15</span>) GPIO name
Select GPIO polarity (Input value: <span class="hl-number">0</span> = Host, <span class="hl-number">1</span> = Device) ---&gt;</pre></div>
</li><li class="- topic/li li" data-ofbid="d282322e56__20250121171752">OTG 工作在 Manual 模式时，由用户手工来切换 Host/Device 模式。相关
menuconfig
配置：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_otg_configuration__codeblock_ujz_5v3_zbc" data-ofbid="usb_otg_configuration__codeblock_ujz_5v3_zbc">&gt; Local packages options
&gt; Third-party packages options
[*] CherryUSB: tiny and portable USB host/device stack <strong class="hl-keyword">for</strong> embedded system with USB IP ---&gt;
[*] Enable usb otg mode ---&gt;
Select otg <strong class="hl-keyword">switch</strong> (Manual) ---&gt;
Select <strong class="hl-keyword">default</strong> mode (Device) ---&gt;</pre><div class="- topic/p p" data-ofbid="d282322e60__20250121171752">手工切换
Host/Device 模式的命令为
<span class="+ topic/keyword sw-d/cmdname keyword cmdname">set_otg_mode</span>：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_otg_configuration__codeblock_d31_wv3_zbc" data-ofbid="usb_otg_configuration__codeblock_d31_wv3_zbc">set_otg_mode host</pre><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_otg_configuration__codeblock_jr4_3lk_5dc" data-ofbid="usb_otg_configuration__codeblock_jr4_3lk_5dc">Usb otg <strong class="hl-keyword">auto</strong> mode (<strong class="hl-keyword">switch</strong> usb0 to host).</pre><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_otg_configuration__codeblock_tz5_3lk_5dc" data-ofbid="usb_otg_configuration__codeblock_tz5_3lk_5dc">set_otg_mode device</pre><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_otg_configuration__codeblock_hc1_jlk_5dc" data-ofbid="usb_otg_configuration__codeblock_hc1_jlk_5dc">Usb otg manual mode (<strong class="hl-keyword">switch</strong> usb0 to device).</pre></div></li></ul></div> 两种模式对应 DTS 文件中的 <code class="+ topic/ph pr-d/codeph ph codeph">otg</code> 节点的不同配置：<div class="table-container"><table class="- topic/table table frame-all" id="usb_otg_configuration__table_l4r_hdz_21c" data-ofbid="usb_otg_configuration__table_l4r_hdz_21c" data-cols="4"><caption></caption><colgroup><col style="width:13.755158184319122%"/><col style="width:27.097661623108664%"/><col style="width:25.722145804676757%"/><col style="width:33.425034387895465%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="usb_otg_configuration__table_l4r_hdz_21c__entry__1">Mode</th><th class="- topic/entry entry colsep-1 rowsep-1" id="usb_otg_configuration__table_l4r_hdz_21c__entry__2">DTS <code class="+ topic/ph pr-d/codeph ph codeph">otg-mode</code> 属性</th><th class="- topic/entry entry colsep-1 rowsep-1" id="usb_otg_configuration__table_l4r_hdz_21c__entry__3">DTS <code class="+ topic/ph pr-d/codeph ph codeph">xxx-gpios</code> 属性</th><th class="- topic/entry entry colsep-0 rowsep-1" id="usb_otg_configuration__table_l4r_hdz_21c__entry__4">运行时 <code class="+ topic/ph pr-d/codeph ph codeph">Host</code> / <code class="+ topic/ph pr-d/codeph ph codeph">Device</code> 切换方法</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="usb_otg_configuration__table_l4r_hdz_21c__entry__1">Auto</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="usb_otg_configuration__table_l4r_hdz_21c__entry__2"><code class="+ topic/ph pr-d/codeph ph codeph">otg-mode = "auto";</code> (如果没有配置
<code class="+ topic/ph pr-d/codeph ph codeph">otg-mode</code> 属性, 默认也是 Auto 模式)</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="usb_otg_configuration__table_l4r_hdz_21c__entry__3"><code class="+ topic/ph pr-d/codeph ph codeph">id-gpios</code> 属性必须配置。 <code class="+ topic/ph pr-d/codeph ph codeph">vbus-en-gpios</code>
和 <code class="+ topic/ph pr-d/codeph ph codeph">dp-sw-gpios</code> 属性根据硬件配置选配。</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="usb_otg_configuration__table_l4r_hdz_21c__entry__4">OTG 驱动根据 <code class="+ topic/ph pr-d/codeph ph codeph">id-gpios</code> 管脚的电平变化 自动切换 USB 工作模式为
<code class="+ topic/ph pr-d/codeph ph codeph">Host</code> / <code class="+ topic/ph pr-d/codeph ph codeph">Device</code>。</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="usb_otg_configuration__table_l4r_hdz_21c__entry__1">Force</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="usb_otg_configuration__table_l4r_hdz_21c__entry__2"><code class="+ topic/ph pr-d/codeph ph codeph">otg-mode = "device";</code> 或者 <code class="+ topic/ph pr-d/codeph ph codeph">otg-mode =
"host";</code></td><td class="- topic/entry entry colsep-1 rowsep-0" headers="usb_otg_configuration__table_l4r_hdz_21c__entry__3"><code class="+ topic/ph pr-d/codeph ph codeph">id-gpios</code> 属性不需要配置。 <code class="+ topic/ph pr-d/codeph ph codeph">vbus-en-gpios</code>
和 <code class="+ topic/ph pr-d/codeph ph codeph">dp-sw-gpios</code> 属性根据硬件配置选配。</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="usb_otg_configuration__table_l4r_hdz_21c__entry__4">需要配置文件节点来手工切换： <code class="+ topic/ph pr-d/codeph ph codeph">echo devices &gt;
/sys/devices/platform/soc/soc\:usb-otg/otg_mode</code> 或者
<code class="+ topic/ph pr-d/codeph ph codeph">echo host &gt;
/sys/devices/platform/soc/soc\:usb-otg/otg_mode</code></td></tr></tbody></table></div>
</section><section class="- topic/section section" id="usb_otg_configuration__section_m4r_hdz_21c" data-ofbid="usb_otg_configuration__section_m4r_hdz_21c"><h2 class="- topic/title title sectiontitle">OTG 相关 GPIO</h2>
<p class="- topic/p p" data-ofbid="d282322e169__20250121171752">从上面配置可以看到和 OTG 功能相关的 GPIO 管脚有 3 个：</p>
<ul class="- topic/ul ul" id="usb_otg_configuration__ul_n4r_hdz_21c" data-ofbid="usb_otg_configuration__ul_n4r_hdz_21c"><li class="- topic/li li" data-ofbid="d282322e173__20250121171752">
<p class="- topic/p p" data-ofbid="d282322e175__20250121171752"><code class="+ topic/ph pr-d/codeph ph codeph">id-gpios</code> 。用来检测当前插入的是不是 OTG 线，如果为 OTG 线则需要把本机切换到 USB Host
模式，否则本机切换到 USB Device 模式。该管脚在 <code class="+ topic/ph pr-d/codeph ph codeph">Auto 模式</code> 模式下是必须配置的，如果缺少该管脚 OTG
只能工作在 <code class="+ topic/ph pr-d/codeph ph codeph">Manual</code> 模式手工进行切换。</p>
</li><li class="- topic/li li" data-ofbid="d282322e186__20250121171752">
<p class="- topic/p p" data-ofbid="d282322e188__20250121171752"><code class="+ topic/ph pr-d/codeph ph codeph">vbus-en-gpios</code> 。该管脚是用来控制 VBUS 的 5V 输出的，通常情况下：切换到 USB Host
模式时需要使能本机端的 VBUS 5V 输出给对端 Device 供电，切换到 USB Device 模式时需要关闭本机端的 VBUS 5V
输出转而对端 Host 的供电。（实际使用上来说，不论本端是 Host/Device 模式，也可以在 VBUS 上一直供电 5V 两边 VBUS
无压差则无漏电，这种情况下 <code class="+ topic/ph pr-d/codeph ph codeph">vbus-en-gpios</code> 无需配置。）</p>
</li><li class="- topic/li li" data-ofbid="d282322e196__20250121171752">
<p class="- topic/p p" data-ofbid="d282322e198__20250121171752"><code class="+ topic/ph pr-d/codeph ph codeph">dp-sw-gpios</code> 。该管脚是在 OTG 外出两个独立 Host、Device 端口时，用来控制外部 Switch
的。非该模式时， <code class="+ topic/ph pr-d/codeph ph codeph">dp-sw-gpios</code> 无需配置。</p>
<div class="- topic/p p" data-ofbid="d282322e206__20250121171752"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_otg_configuration__image_p4r_hdz_21c" src="../../../images/usb/otg_gpio.png" alt="image2"/></div><br/></div>
</li></ul>
<p class="- topic/p p" data-ofbid="d282322e212__20250121171752">3 个 GPIO 管脚的具体使用场景如上图所示，用户根据自己的使用场景来选择配置哪些 GPIO。每个 GPIO 的 输入输出正反电平有效，可以通过 <span class="- topic/ph ph">menuconfig 菜单中的 <code class="+ topic/ph pr-d/codeph ph codeph">GPIO polarity</code> 选项来配置。</span>：</p>
</section><section class="- topic/section section" id="usb_otg_configuration__section_cls_hw3_zbc" data-ofbid="usb_otg_configuration__section_cls_hw3_zbc"><h2 class="- topic/title title sectiontitle">USB Host/Device 配置</h2>
<div class="- topic/p p" data-ofbid="d282322e226__20250121171752">在 OTG 模式下 CherryUSB 的 Device Mode 和 Host Mode 都必须使能，并且需要配置上相应应用。下图实例使能了 Host U 盘 和
Device MSC RAM disk
设备：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_otg_configuration__codeblock_ab3_3w3_zbc" data-ofbid="usb_otg_configuration__codeblock_ab3_3w3_zbc">Local packages options
&gt; Third-party packages options
[*] CherryUSB: tiny and portable USB host/device stack <strong class="hl-keyword">for</strong> embedded system with USB IP ---&gt;
[*] Enable usb otg mode ---&gt;
[*] Enable usb device mode ---&gt;
[*] Enable usb msc device ---&gt;
Use ram or storage template (msc ram) ---&gt;
[*] Enable usb host mode ---&gt;
[*] Enable usb msc driver ---&gt;
[*] Use msc template</pre></div>
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<div class=" wh_topic_toc "><div class="wh_topic_label">在本页上</div><ul><li class="section-item"><div class="section-title"><a href="#usb_otg_configuration__section_kvg_l3z_21c" data-tocid="usb_otg_configuration__section_kvg_l3z_21c">OTG 模式配置</a></div></li><li class="section-item"><div class="section-title"><a href="#usb_otg_configuration__section_m4r_hdz_21c" data-tocid="usb_otg_configuration__section_m4r_hdz_21c">OTG 相关 GPIO</a></div></li><li class="section-item"><div class="section-title"><a href="#usb_otg_configuration__section_cls_hw3_zbc" data-tocid="usb_otg_configuration__section_cls_hw3_zbc">USB Host/Device 配置</a></div></li></ul></div>
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