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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" title="Edit this document" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/usb/usb-device-key_procedures.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">关键流程设计</h1>
<div class="date inPage">15 Jan 2024</div><div style="color: gray;">
Read time: 1 minute(s)
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<div class="- topic/body concept/conbody body conbody">
<section class="- topic/section section" id="usb_device_key_procedures__section_kyj_qmz_21c" data-ofbid="usb_device_key_procedures__section_kyj_qmz_21c"><h2 class="- topic/title title sectiontitle">初始化流程</h2>
<p class="- topic/p p" data-ofbid="d190730e38__20250123155220">DCD 驱动的入口是 platform 驱动，初始化流程先获取 irq、reg、clk、reset 等资源并进行初始化，最后调用 usb_add_gadget_udc()
向系统中注册。</p>
<div class="- topic/p p" data-ofbid="d190730e41__20250123155220">大致的流程如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_device_key_procedures__codeblock_yvz_qmz_21c" data-ofbid="usb_device_key_procedures__codeblock_yvz_qmz_21c"><code>|--&gt;aic_udc_probe()
|--&gt;gg-&gt;regs = devm_ioremap_resource(&amp;dev-&gt;dev, res);
|--&gt;gg-&gt;reset = devm_reset_control_get_optional(gg-&gt;dev, <span class="hl-string">"aicudc"</span>);
|--&gt;gg-&gt;reset_ecc = devm_reset_control_get_optional_shared(gg-&gt;dev,<span class="hl-string">"aicudc-ecc"</span>);
|--&gt;gg-&gt;clks[i] = of_clk_get(gg-&gt;dev-&gt;of_node, i);
|--&gt;aic_gadget_init(gg);
|--&gt;aic_low_hw_enable()
|--&gt;clk_prepare_enable(gg-&gt;clks[i]);
|--&gt;reset_control_deassert(gg-&gt;reset);
|--&gt;reset_control_deassert(gg-&gt;reset_ecc);
|--&gt;res = platform_get_resource(dev, IORESOURCE_IRQ, <span class="hl-number">0</span>);
|--&gt;gg-&gt;irq = res-&gt;start;
|--&gt;usb_add_gadget_udc(gg-&gt;dev, &amp;gg-&gt;gadget);</code></pre></div>
</section>
<section class="- topic/section section" id="usb_device_key_procedures__section_myj_qmz_21c" data-ofbid="usb_device_key_procedures__section_myj_qmz_21c"><h2 class="- topic/title title sectiontitle">ep 分配流程</h2>
<div class="- topic/p p" data-ofbid="d190730e52__20250123155220"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_device_key_procedures__image_nyj_qmz_21c" src="../../../images/usb/usb_dcd_ep_pool.png" alt="image5"/></div><br/></div>
<p class="- topic/p p" data-ofbid="d190730e59__20250123155220">如上图所示，ep 资源的操作分为两部分：</p>
<ul class="- topic/ul ul" id="usb_device_key_procedures__ul_oyj_qmz_21c" data-ofbid="usb_device_key_procedures__ul_oyj_qmz_21c">
<li class="- topic/li li" data-ofbid="d190730e64__20250123155220">
<p class="- topic/p p" data-ofbid="d190730e66__20250123155220">ep 资源池初始化。在 udc 驱动初始化的时候同时初始化了 ep 资源池，这样就决定了当前有多少个 ep 资源可用。</p>
</li>
<li class="- topic/li li" data-ofbid="d190730e70__20250123155220">
<p class="- topic/p p" data-ofbid="d190730e72__20250123155220">ep 资源的分配。gadget composite device 可以配置多个 interface 即 gadget function driver，当
function driver 启用时，会从资源池中分配需要的 ep。如果配置的 function driver 过多，就可能会分配失败。</p>
</li>
</ul>
</section>
<section class="- topic/section section" id="usb_device_key_procedures__section_pyj_qmz_21c" data-ofbid="usb_device_key_procedures__section_pyj_qmz_21c"><h2 class="- topic/title title sectiontitle">普通 ep 的 request 处理</h2>
<div class="- topic/p p" data-ofbid="d190730e83__20250123155220"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_device_key_procedures__image_qyj_qmz_21c" src="../../../images/usb/usb_dcd_ep_queue.png" alt="image6"/></div><br/></div>
<p class="- topic/p p" data-ofbid="d190730e90__20250123155220">如上图所示，对于普通 ep 的 reuqest 数据收发分为两步：</p>
<ul class="- topic/ul ul" id="usb_device_key_procedures__ul_ryj_qmz_21c" data-ofbid="usb_device_key_procedures__ul_ryj_qmz_21c">
<li class="- topic/li li" data-ofbid="d190730e95__20250123155220">
<p class="- topic/p p" data-ofbid="d190730e97__20250123155220">request enqueue。首先调用 udc 的 <code class="+ topic/ph pr-d/codeph ph codeph">.queue()</code> 函数，将需要传输的数据插入到硬件控制器对应的
ep 寄存器当中。</p>
</li>
<li class="- topic/li li" data-ofbid="d190730e104__20250123155220">
<p class="- topic/p p" data-ofbid="d190730e106__20250123155220">complete callback。ep 数据收发完成会产生 <code class="+ topic/ph pr-d/codeph ph codeph">transfer complete</code>
中断，在中断服务程序中调用 <code class="+ topic/ph pr-d/codeph ph codeph">complete</code> 回调函数，结束整个 request 传输。</p>
</li>
</ul>
</section>
<section class="- topic/section section" id="usb_device_key_procedures__section_syj_qmz_21c" data-ofbid="usb_device_key_procedures__section_syj_qmz_21c"><h2 class="- topic/title title sectiontitle">ep0 的 request 处理</h2>
<div class="- topic/p p" data-ofbid="d190730e123__20250123155220"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_device_key_procedures__image_tyj_qmz_21c" src="../../../images/usb/usb_dcd_ep0_queue.png" alt="image7"/></div><br/></div>
<p class="- topic/p p" data-ofbid="d190730e130__20250123155220">如上图所示，对于 ep0 的 reuqest 数据收发和 普通 ep 基本一样，只是对数据的回调处理稍有不同。</p>
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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_device_key_procedures__section_kyj_qmz_21c" data-tocid="usb_device_key_procedures__section_kyj_qmz_21c">初始化流程</a></div></li><li class="section-item"><div class="section-title"><a href="#usb_device_key_procedures__section_myj_qmz_21c" data-tocid="usb_device_key_procedures__section_myj_qmz_21c">ep 分配流程</a></div></li><li class="section-item"><div class="section-title"><a href="#usb_device_key_procedures__section_pyj_qmz_21c" data-tocid="usb_device_key_procedures__section_pyj_qmz_21c">普通 ep 的 request 处理</a></div></li><li class="section-item"><div class="section-title"><a href="#usb_device_key_procedures__section_syj_qmz_21c" data-tocid="usb_device_key_procedures__section_syj_qmz_21c">ep0 的 request 处理</a></div></li></ul></div>
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