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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-aic_udc_driver.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">AIC UDC Driver</h1><div class="date inPage">8 Aug 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"><p class="- topic/p p" data-ofbid="d283000e22__20250121171752"><code class="+ topic/ph pr-d/codeph ph codeph">UDC Driver</code> 在需要完成的工作有两点：</p><ul class="- topic/ul ul" id="usb_aic_udc_driver__ul_u4y_nqz_21c" data-ofbid="usb_aic_udc_driver__ul_u4y_nqz_21c"><li class="- topic/li li" data-ofbid="d283000e27__20250121171752">
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<p class="- topic/p p" data-ofbid="d283000e29__20250121171752">把 UDC 硬件注册成标准的 Gadget Device，以便提供标准的 Gadget API 给 Gadget Function 驱动来使用。</p>
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</li><li class="- topic/li li" data-ofbid="d283000e32__20250121171752">
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<p class="- topic/p p" data-ofbid="d283000e34__20250121171752">提供 endpoint 资源池，处理 endpoint 层级的数据收发。</p>
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</li><li class="- topic/li li" data-ofbid="d283000e37__20250121171752">
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<p class="- topic/p p" data-ofbid="d283000e39__20250121171752">需要处理部分 Endpoint0 Setup 逻辑。</p>
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</li></ul><section class="- topic/section section" id="usb_aic_udc_driver__section_qjy_pqz_21c" data-ofbid="usb_aic_udc_driver__section_qjy_pqz_21c"><h2 class="- topic/title title sectiontitle">Init</h2>
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<div class="- topic/p p" data-ofbid="d283000e47__20250121171752"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_aic_udc_driver__image_tks_4qz_21c" src="../../../images/usb/usb_udc_init.png" alt="image7"/></div><br/></div>
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<p class="- topic/p p" data-ofbid="d283000e52__20250121171752">UDC 驱动把资源初始化好以后，注册成一个标准的 gadget 设备。</p>
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</section><section class="- topic/section section" id="usb_aic_udc_driver__section_uks_4qz_21c" data-ofbid="usb_aic_udc_driver__section_uks_4qz_21c"><h2 class="- topic/title title sectiontitle">gadget.ops</h2>
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<p class="- topic/p p" data-ofbid="d283000e60__20250121171752">UDC 驱动需要提供 gadget 设备的操作函数集 <code class="+ topic/ph pr-d/codeph ph codeph">gadget.ops</code>。简单定义如下：</p>
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_aic_udc_driver__pre_vks_4qz_21c" data-ofbid="usb_aic_udc_driver__pre_vks_4qz_21c">staticconststructusb_gadget_opsaic_usb_gadget_ops={.get_frame=aic_gg_getframe,.udc_start=aic_gg_udc_start,.udc_stop=aic_gg_udc_stop,.pullup=aic_gg_pullup,.vbus_session=aic_gg_vbus_session,.vbus_draw=aic_gg_vbus_draw,};</pre>
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<p class="- topic/p p" data-ofbid="d283000e69__20250121171752">其中的核心函数为 <code class="+ topic/ph pr-d/codeph ph codeph">.udc_start()</code> ，在调用该函数以后 UDC 才真正进入工作状态。其主要流程如下：</p>
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<div class="- topic/p p" data-ofbid="d283000e75__20250121171752"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_aic_udc_driver__image_wks_4qz_21c" src="../../../images/usb/usb_udc_start.png" alt="image8"/></div><br/></div>
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</section><section class="- topic/section section" id="usb_aic_udc_driver__section_xks_4qz_21c" data-ofbid="usb_aic_udc_driver__section_xks_4qz_21c"><h2 class="- topic/title title sectiontitle">ep.ops</h2>
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<p class="- topic/p p" data-ofbid="d283000e85__20250121171752">UDC 驱动需要提供 endpoint 的操作函数集 <code class="+ topic/ph pr-d/codeph ph codeph">ep.ops</code>。简单定义如下：</p>
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_aic_udc_driver__pre_yks_4qz_21c" data-ofbid="usb_aic_udc_driver__pre_yks_4qz_21c">staticconststructusb_ep_opsaic_usb_ep_ops={.enable=aic_ep_enable,.disable=aic_ep_disable,.alloc_request=aic_ep_alloc_request,.free_request=aic_ep_free_request,.queue=aic_ep_queue_request,.dequeue=aic_ep_dequeue_request,.set_halt=aic_ep_sethalt,};</pre>
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<p class="- topic/p p" data-ofbid="d283000e94__20250121171752">其中 <code class="+ topic/ph pr-d/codeph ph codeph">.queue()</code> 函数负责接收 Gadget Function 驱动发送下来的
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<code class="+ topic/ph pr-d/codeph ph codeph">usb_request</code>。其主要流程如下：</p>
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<div class="- topic/p p" data-ofbid="d283000e103__20250121171752"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_aic_udc_driver__image_zks_4qz_21c" src="../../../images/usb/usb_udc_queue.png" alt="image9"/></div><br/></div>
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</section><section class="- topic/section section" id="usb_aic_udc_driver__section_als_4qz_21c" data-ofbid="usb_aic_udc_driver__section_als_4qz_21c"><h2 class="- topic/title title sectiontitle">Interrupt</h2>
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<p class="- topic/p p" data-ofbid="d283000e113__20250121171752">UDC 驱动主要承担的是数据收发，在上一节收到 <code class="+ topic/ph pr-d/codeph ph codeph">usb_request</code>
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请求以后，接下来就是等待硬件处理完成产生中断了。中断处理的主要流程如下：</p>
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<div class="- topic/p p" data-ofbid="d283000e119__20250121171752"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_aic_udc_driver__image_bls_4qz_21c" src="../../../images/usb/usb_udc_interrupt_flow.png" alt="image10"/></div><br/></div>
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</section><section class="- topic/section section" id="usb_aic_udc_driver__section_cls_4qz_21c" data-ofbid="usb_aic_udc_driver__section_cls_4qz_21c"><h2 class="- topic/title title sectiontitle">EP0 Setup</h2>
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<p class="- topic/p p" data-ofbid="d283000e129__20250121171752">UDC 驱动还有一项重要工作就是负责 EP0 Control 状态机的处理。USB ep0 上的 Control Transfer 处理分为 3 个阶段：
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<code class="+ topic/ph pr-d/codeph ph codeph">Setup Stage</code> 、 <code class="+ topic/ph pr-d/codeph ph codeph">Data In/Out Stage</code> 、
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<code class="+ topic/ph pr-d/codeph ph codeph">Status In/Out Stage</code> 。具体对应以下 5 种状态：</p>
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_aic_udc_driver__pre_dls_4qz_21c" data-ofbid="usb_aic_udc_driver__pre_dls_4qz_21c"><em class="hl-comment">/*Gadgetep0states*/</em>enumep0_state{EP0_SETUP,EP0_DATA_IN,EP0_DATA_OUT,EP0_STATUS_IN,EP0_STATUS_OUT,};</pre>
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<p class="- topic/p p" data-ofbid="d283000e144__20250121171752">这几种状态之间的转换流程如下所示：</p>
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<div class="- topic/p p" data-ofbid="d283000e147__20250121171752"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_aic_udc_driver__image_els_4qz_21c" src="../../../images/usb/usb_udc_ep0_control.png" alt="image11"/></div><br/></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_aic_udc_driver__section_qjy_pqz_21c" data-tocid="usb_aic_udc_driver__section_qjy_pqz_21c">Init</a></div></li><li class="section-item"><div class="section-title"><a href="#usb_aic_udc_driver__section_uks_4qz_21c" data-tocid="usb_aic_udc_driver__section_uks_4qz_21c">gadget.ops</a></div></li><li class="section-item"><div class="section-title"><a href="#usb_aic_udc_driver__section_xks_4qz_21c" data-tocid="usb_aic_udc_driver__section_xks_4qz_21c">ep.ops</a></div></li><li class="section-item"><div class="section-title"><a href="#usb_aic_udc_driver__section_als_4qz_21c" data-tocid="usb_aic_udc_driver__section_als_4qz_21c">Interrupt</a></div></li><li class="section-item"><div class="section-title"><a href="#usb_aic_udc_driver__section_cls_4qz_21c" data-tocid="usb_aic_udc_driver__section_cls_4qz_21c">EP0 Setup</a></div></li></ul></div>
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