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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/dma/dma-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">4 Dec 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="d179201e22__20250121171624">本节介绍了 DMA 模块的关键流程。</p><section class="- topic/section section topic" id="concept_mvx_yn3_pzb__id5" data-ofbid="concept_mvx_yn3_pzb__id5"><h2 class="- topic/title title sectiontitle">初始化流程</h2>
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<p class="- topic/p p" data-ofbid="d179201e29__20250121171624">DMA 驱动的初始化接口通过 <span class="+ topic/keyword pr-d/apiname keyword apiname">INIT_BOARD_EXPORT(drv_dma_init)</span> 完成注册，其中主要步骤有：</p>
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<ol class="- topic/ol ol arabic simple" id="concept_mvx_yn3_pzb__ol_kqc_33d_bdc" data-ofbid="concept_mvx_yn3_pzb__ol_kqc_33d_bdc"><li class="- topic/li li" data-ofbid="d179201e36__20250121171624">
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<p class="- topic/p p" data-ofbid="d179201e38__20250121171624">初始化模块的 clk。</p>
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</li><li class="- topic/li li" data-ofbid="d179201e41__20250121171624">
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<p class="- topic/p p" data-ofbid="d179201e43__20250121171624">初始化 DMA 通道、任务描述符管理信息。</p>
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</li><li class="- topic/li li" data-ofbid="d179201e46__20250121171624">
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<p class="- topic/p p" data-ofbid="d179201e48__20250121171624">注册中断。</p>
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</li></ol>
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</section><section class="- topic/section section" id="concept_mvx_yn3_pzb__section_vwr_sms_c1c" data-ofbid="concept_mvx_yn3_pzb__section_vwr_sms_c1c"><h2 class="- topic/title title sectiontitle">DMA Client 的调用流程</h2>
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<p class="- topic/p p" data-ofbid="d179201e57__20250121171624">作为 DMA 用户，调用流程如下：</p>
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<figure class="- topic/fig fig fignone" id="concept_mvx_yn3_pzb__fig_kbf_yms_c1c" data-ofbid="concept_mvx_yn3_pzb__fig_kbf_yms_c1c"><div class="- topic/p p" data-ofbid="d179201e63__20250121171624"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="concept_mvx_yn3_pzb__image_wwr_sms_c1c" src="../../../images/dma/client_flow.png" alt="client_flow1"/></div><br/></div><figcaption data-caption-side="bottom" class="- topic/title title figcap"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 1</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">DMA Client 调用流程</span></figcaption></figure>
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<p class="- topic/p p" data-ofbid="d179201e68__20250121171624">在 <a class="- topic/xref xref" href="dma-key-procedures.html#concept_mvx_yn3_pzb__fig_kbf_yms_c1c">DMA Client 调用流程</a>中：</p>
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<ul class="- topic/ul ul" id="concept_mvx_yn3_pzb__ul_xwr_sms_c1c" data-ofbid="concept_mvx_yn3_pzb__ul_xwr_sms_c1c"><li class="- topic/li li" data-ofbid="d179201e76__20250121171624">
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<p class="- topic/p p" data-ofbid="d179201e78__20250121171624"><span class="+ topic/keyword pr-d/apiname keyword apiname">dmaengine_submit()</span>：将传输请求提交到 DMA Engine 的缓存中，但不开始传输数据。</p>
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</li><li class="- topic/li li" data-ofbid="d179201e83__20250121171624">
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<p class="- topic/p p" data-ofbid="d179201e85__20250121171624"><span class="+ topic/keyword pr-d/apiname keyword apiname">dma_async_issue pending()</span>：将传输请求加入到 DMA Device
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的请求队列中，接下来才会启动数据传输。</p>
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</li></ul>
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</section><section class="- topic/section section" id="concept_mvx_yn3_pzb__section_ywr_sms_c1c" data-ofbid="concept_mvx_yn3_pzb__section_ywr_sms_c1c"><h2 class="- topic/title title sectiontitle">中断处理流程</h2>
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<div class="- topic/div div">
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<p class="- topic/p p" data-ofbid="d179201e101__20250121171624">DMA 中断处理流程可以确保数据高效传输并合理配置系统资源。当 DMA 传输完成或遇到错误时，中断机制会触发相应的处理程序。中断处理流程如下所示：</p>
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<ol class="- topic/ol ol arabic simple" id="concept_mvx_yn3_pzb__ol_nqc_33d_bdc" data-ofbid="concept_mvx_yn3_pzb__ol_nqc_33d_bdc"><li class="- topic/li li" data-ofbid="d179201e105__20250121171624">
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<p class="- topic/p p" data-ofbid="d179201e107__20250121171624">读取 DMA 完成寄存器，获取已完成的传输数量信息，并逐个查看每个 DMA 通道的完成状态。</p>
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<p class="- topic/p p" data-ofbid="d179201e110__20250121171624">在处理完中断后，需要清除相应通道的中断标志位，以免再次触发相同的中断。</p>
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</li><li class="- topic/li li" data-ofbid="d179201e113__20250121171624">
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<p class="- topic/p p" data-ofbid="d179201e115__20250121171624">如果通道有任务传输完成，就调用相应 DMA client 注册的回调函数，进行后续数据处理或其他操作。</p>
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<p class="- topic/p p" data-ofbid="d179201e118__20250121171624">每个 DMA 通道在初始化时都会注册一个回调函数，当该通道的传输任务完成时，就会调用这个回调函数。</p>
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</li></ol>
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</section></div></article></main></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="#concept_mvx_yn3_pzb__id5" data-tocid="concept_mvx_yn3_pzb__id5">初始化流程</a></div></li><li class="section-item"><div class="section-title"><a href="#concept_mvx_yn3_pzb__section_vwr_sms_c1c" data-tocid="concept_mvx_yn3_pzb__section_vwr_sms_c1c">DMA Client 的调用流程</a></div></li><li class="section-item"><div class="section-title"><a href="#concept_mvx_yn3_pzb__section_ywr_sms_c1c" data-tocid="concept_mvx_yn3_pzb__section_ywr_sms_c1c">中断处理流程</a></div></li></ul></div>
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