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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-source_sink_function.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">SourceSink Function</h1><div class="date inPage">24 Jan 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="d296975e22__20250121171801"><code class="+ topic/ph pr-d/codeph ph codeph">SourceSink Function</code> 的主要功能是提供了一组 USB 测试 endpoint，其中:</p><ul class="- topic/ul ul" id="usb_source_sink_function__ul_vjq_zjz_21c" data-ofbid="usb_source_sink_function__ul_vjq_zjz_21c"><li class="- topic/li li" data-ofbid="d296975e27__20250121171801">
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<p class="- topic/p p" data-ofbid="d296975e29__20250121171801"><code class="+ topic/ph pr-d/codeph ph codeph">Sink</code>。sinks bulk packets OUT to the peripheral。意思是把数据从 Host 引流到
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Device，即 <code class="+ topic/ph pr-d/codeph ph codeph">OUT</code> 方向。</p>
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</li><li class="- topic/li li" data-ofbid="d296975e37__20250121171801">
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<p class="- topic/p p" data-ofbid="d296975e39__20250121171801"><code class="+ topic/ph pr-d/codeph ph codeph">Source</code>。sources them IN to the host。意思是把从 Device 发送数据到 Device，即
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<code class="+ topic/ph pr-d/codeph ph codeph">IN</code> 方向。</p>
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</li></ul><p class="- topic/p p" data-ofbid="d296975e47__20250121171801">具体提供了 4 组 测试 endpoint：</p><div class="table-container"><table class="- topic/table table frame-all" id="usb_source_sink_function__table_wjq_zjz_21c" data-ofbid="usb_source_sink_function__table_wjq_zjz_21c" data-cols="4"><caption></caption><colgroup><col style="width:18.231046931407946%"/><col style="width:18.05054151624549%"/><col style="width:18.953068592057765%"/><col style="width:44.76534296028882%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="usb_source_sink_function__table_wjq_zjz_21c__entry__1">Endpoint</th><th class="- topic/entry entry colsep-1 rowsep-1" id="usb_source_sink_function__table_wjq_zjz_21c__entry__2">Type</th><th class="- topic/entry entry colsep-1 rowsep-1" id="usb_source_sink_function__table_wjq_zjz_21c__entry__3">Direction</th><th class="- topic/entry entry colsep-0 rowsep-1" id="usb_source_sink_function__table_wjq_zjz_21c__entry__4">Descript|</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="usb_source_sink_function__table_wjq_zjz_21c__entry__1">in_ep</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="usb_source_sink_function__table_wjq_zjz_21c__entry__2">bulk</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="usb_source_sink_function__table_wjq_zjz_21c__entry__3">IN</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="usb_source_sink_function__table_wjq_zjz_21c__entry__4">
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<p class="- topic/p p" data-ofbid="d296975e75__20250121171801">Source 发送数据到 Host，</p>
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<p class="- topic/p p" data-ofbid="d296975e78__20250121171801">注意这数据是 Device 主动生成的</p>
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</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="usb_source_sink_function__table_wjq_zjz_21c__entry__1">out_ep</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="usb_source_sink_function__table_wjq_zjz_21c__entry__2">bulk</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="usb_source_sink_function__table_wjq_zjz_21c__entry__3">OUT</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="usb_source_sink_function__table_wjq_zjz_21c__entry__4">Sink 接收 Host 的数据</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="usb_source_sink_function__table_wjq_zjz_21c__entry__1">iso_in_ep</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="usb_source_sink_function__table_wjq_zjz_21c__entry__2">iso</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="usb_source_sink_function__table_wjq_zjz_21c__entry__3">IN</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="usb_source_sink_function__table_wjq_zjz_21c__entry__4">Source 发送数据到 Host</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="usb_source_sink_function__table_wjq_zjz_21c__entry__1">iso_out_ep</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="usb_source_sink_function__table_wjq_zjz_21c__entry__2">iso</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="usb_source_sink_function__table_wjq_zjz_21c__entry__3">OUT</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="usb_source_sink_function__table_wjq_zjz_21c__entry__4">Sink 接收 Host 的数据</td></tr></tbody></table></div><p class="- topic/p p" data-ofbid="d296975e108__20250121171801">主要流程如下：</p><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_source_sink_function__pre_xjq_zjz_21c" data-ofbid="usb_source_sink_function__pre_xjq_zjz_21c">drivers\usb\gadget\function\f_sourcesink.c:
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sourcesink_bind()：
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<strong class="hl-keyword">static</strong> <strong class="hl-keyword">int</strong>
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sourcesink_bind(<strong class="hl-keyword">struct</strong> usb_configuration *c, <strong class="hl-keyword">struct</strong> usb_function *f)
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{
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<em class="hl-comment">/* (1) 从 gadget 中分配 2 个 bulk endpoint */</em>
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<em class="hl-comment">/* allocate bulk endpoints */</em>
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ss->in_ep = usb_ep_autoconfig(cdev->gadget, &fs_source_desc);
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ss->out_ep = usb_ep_autoconfig(cdev->gadget, &fs_sink_desc);
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<em class="hl-comment">/* (2) 如果支持 ISO，再从 gadget 中分配 2 个 iso endpoint */</em>
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<em class="hl-comment">/* allocate iso endpoints */</em>
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ss->iso_in_ep = usb_ep_autoconfig(cdev->gadget, &fs_iso_source_desc);
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<strong class="hl-keyword">if</strong> (!ss->iso_in_ep)
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<strong class="hl-keyword">goto</strong> no_iso;
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ss->iso_out_ep = usb_ep_autoconfig(cdev->gadget, &fs_iso_sink_desc);
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<strong class="hl-keyword">if</strong> (!ss->iso_out_ep) {
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}
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sourcesink_set_alt() → enable_source_sink() → usb_ep_enable()/source_sink_start_ep()：
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<em class="hl-comment">// 启动上述 endpoint</em>
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→ source_sink_complete():
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<em class="hl-comment">// urb 的 complete() 函数，urb 发送/接收完成后，重新挂载 urb</em>
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</pre><p class="- topic/p p" data-ofbid="d296975e112__20250121171801">还支持一些参数调整：</p><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_source_sink_function__pre_yjq_zjz_21c" data-ofbid="usb_source_sink_function__pre_yjq_zjz_21c"><em class="+ topic/ph hi-d/i ph i"># ls functions/SourceSink.<span class="hl-number">0</span>/</em>bulk_bufleniso_qlenisoc_maxburstisoc_multbulk_qlenisoc_intervalisoc_maxpacketpattern</pre></div></article></main></div>
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