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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">
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<span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://aicdocco/taskstopics/sdk/dvp/dvp_key_procedure_lite.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">关键流程设计</h1>
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<div class="date inPage">16 May 2025</div><div style="color: gray;">
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Read time: 1 minute(s)
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</div>
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<div class="- topic/body concept/conbody body conbody">
|
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<section class="- topic/section section" id="dvp-key-procedure__section_hfd_hpf_fdc" data-ofbid="dvp-key-procedure__section_hfd_hpf_fdc"><h2 class="- topic/title title sectiontitle">初始化流程</h2>
|
||
|
||
<p class="- topic/p p" data-ofbid="d92869e38__20250519091514">总体上看，DVP 驱动的初始化过程分为两大段：</p>
|
||
<ol class="- topic/ol ol arabic simple" id="dvp-key-procedure__ol_vxt_1kt_2dc" data-ofbid="dvp-key-procedure__ol_vxt_1kt_2dc">
|
||
<li class="- topic/li li" data-ofbid="d92869e43__20250519091514">
|
||
<p class="- topic/p p" data-ofbid="d92869e45__20250519091514">由 <span class="+ topic/keyword pr-d/apiname keyword apiname">probe()</span>
|
||
接口完成中断申请、管理状态初始化，主要任务包括注册中断处理函数、初始化全局变量和数据结构。</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d92869e52__20250519091514">
|
||
<p class="- topic/p p" data-ofbid="d92869e54__20250519091514">由 <span class="+ topic/keyword pr-d/apiname keyword apiname">open()</span> 接口完成，需要等 Sensor 执行完初始化后才能执行。完成的操作包括使能时钟、使能 DVP
|
||
控制器、初始化 Buf 链表信息等。</p>
|
||
</li>
|
||
</ol>
|
||
</section>
|
||
<section class="- topic/section section" id="dvp-key-procedure__section_nq5_wpt_2dc" data-ofbid="dvp-key-procedure__section_nq5_wpt_2dc"><h2 class="- topic/title title sectiontitle">Buf 管理</h2>
|
||
|
||
<p class="- topic/p p" data-ofbid="d92869e68__20250519091514">Buf 管理涉及以下关键操作：</p>
|
||
<ul class="- topic/ul ul" id="dvp-key-procedure__ul_b2c_h4t_2dc" data-ofbid="dvp-key-procedure__ul_b2c_h4t_2dc">
|
||
<li class="- topic/li li" data-ofbid="d92869e73__20250519091514">初始化 Buf 队列。</li>
|
||
<li class="- topic/li li" data-ofbid="d92869e76__20250519091514">分配和释放 Buf。</li>
|
||
<li class="- topic/li li" data-ofbid="d92869e79__20250519091514">将 Buf 添加到空闲队列或工作队列。</li>
|
||
</ul>
|
||
<p class="- topic/p p" data-ofbid="d92869e83__20250519091514">详见 MPP VIN 模块中的 <a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="../mpp/mpp-vin-design-interface.html#mpp_vin_%E8%AE%BE%E8%AE%A1%E5%8F%8A%E6%8E%A5%E5%8F%A3%E8%AF%B4%E6%98%8E__section_znl_jf4_f1c">Buf 队列管理</a></p>
|
||
</section>
|
||
<section class="- topic/section section" id="dvp-key-procedure__section_vst_xym_4dc" data-ofbid="dvp-key-procedure__section_vst_xym_4dc"><h2 class="- topic/title title sectiontitle">中断处理流程</h2>
|
||
|
||
<div class="- topic/div div section" id="dvp-key-procedure__id6">
|
||
<div class="- topic/p p" data-ofbid="d92869e97__20250519091514">DVP 的中断处理函数中主要处理 Buf 的队列切换操作。 DVP 硬件提供的中断可以反映出多个状态（包括出错状态），其中包括以下关键状态：<div class="- topic/note note note note_note" id="dvp-key-procedure__note_hhd_w4t_2dc" data-ofbid="dvp-key-procedure__note_hhd_w4t_2dc"><span class="note__title">注：</span> <span class="+ topic/ph ui-d/uicontrol ph uicontrol">HNUM Interrupt</span> 会先于
|
||
<span class="+ topic/ph ui-d/uicontrol ph uicontrol">Frame done</span> 发生。</div></div>
|
||
<ul class="- topic/ul ul arabic simple" id="dvp-key-procedure__ol_wxt_1kt_2dc" data-ofbid="dvp-key-procedure__ol_wxt_1kt_2dc">
|
||
<li class="- topic/li li" data-ofbid="d92869e109__20250519091514">
|
||
<p class="- topic/p p" data-ofbid="d92869e111__20250519091514"><span class="+ topic/ph ui-d/uicontrol ph uicontrol">HNUM Interrupt</span></p>
|
||
<p class="- topic/p p" data-ofbid="d92869e115__20250519091514">用于判断当前 Register 是否可以修改。出现 <span class="+ topic/ph ui-d/uicontrol ph uicontrol">HNUM
|
||
Interrupt</span>，表示当前图像帧已经完成 1/4 帧（驱动中默认配置）数据的刷新，意味着此时的 Buf 相关
|
||
Register （影子寄存器）可以被修改，软件可以传入下一个 Buf 的参数了。</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d92869e122__20250519091514">
|
||
<p class="- topic/p p" data-ofbid="d92869e124__20250519091514"><span class="+ topic/ph ui-d/uicontrol ph uicontrol">Frame done</span></p>
|
||
<p class="- topic/p p" data-ofbid="d92869e128__20250519091514">用于判断当前 buf 是否完成（done 状态）。出现 <span class="+ topic/ph ui-d/uicontrol ph uicontrol">Frame
|
||
done</span>，表示当前帧的数据传输完成，此时该 buf 可以从 QBuf list 切换到 DQbuf list。</p>
|
||
</li>
|
||
</ul>
|
||
<p class="- topic/p p" data-ofbid="d92869e136__20250519091514">按照 DVP 硬件设计的逻辑，<span class="+ topic/ph ui-d/uicontrol ph uicontrol">HNUM Interrupt</span> 和 <span class="+ topic/ph ui-d/uicontrol ph uicontrol">Frame
|
||
done</span> 会间隔着产生，如下所示：</p>
|
||
<p class="- topic/p p" data-ofbid="d92869e145__20250519091514">
|
||
<span class="+ topic/keyword pr-d/parmname keyword parmname">HNUM Interrupt -> Framedone -> HNUM Interrupt -> Frame done
|
||
-> HNUM Interrupt -> Frame done...</span>
|
||
</p>
|
||
<figure class="- topic/fig fig fignone" id="dvp-key-procedure__id9" data-ofbid="dvp-key-procedure__id9">
|
||
|
||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="dvp-key-procedure__image_zxt_1kt_2dc" src="../../../reusables/reused-topics/../../images/dvp/dvp_irq_flow.png" alt="dvp_irq_flow"/></div><br/>
|
||
<figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><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">DVP 驱动中 IRQ 处理流程</span></figcaption></figure>
|
||
<div class="- topic/p p" data-ofbid="d92869e164__20250519091514">以下分别介绍了关键状态的详细处理流程：<ul class="- topic/ul ul" id="dvp-key-procedure__ul_q5w_nqt_2dc" data-ofbid="dvp-key-procedure__ul_q5w_nqt_2dc">
|
||
<li class="- topic/li li" data-ofbid="d92869e168__20250519091514">“处理 Frame done 事件” 的子流程如下：<figure class="- topic/fig fig fignone" id="dvp-key-procedure__id10" data-ofbid="dvp-key-procedure__id10">
|
||
|
||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="dvp-key-procedure__image_ayt_1kt_2dc" src="../../../reusables/reused-topics/../../images/dvp/dvp_frame_done_flow.png" alt="dvp_frame_done_flow"/></div><br/>
|
||
<figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 2</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">DVP 驱动中 Frame done 处理流程</span></figcaption></figure></li>
|
||
<li class="- topic/li li" data-ofbid="d92869e182__20250519091514">
|
||
<div class="- topic/p p" data-ofbid="d92869e184__20250519091514">“处理 HNUM Interrupt 事件” 的子流程如下：<figure class="- topic/fig fig fignone" id="dvp-key-procedure__id11" data-ofbid="dvp-key-procedure__id11">
|
||
|
||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="dvp-key-procedure__image_byt_1kt_2dc" src="../../../reusables/reused-topics/../../images/dvp/dvp_hnum_int_flow.png" alt="dvp_hnum_int_flow"/></div><br/>
|
||
<figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 3</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">DVP 驱动中 HNUM Interrupt 处理流程</span></figcaption></figure></div>
|
||
<ul class="- topic/ul ul simple" id="dvp-key-procedure__ul_cyt_1kt_2dc" data-ofbid="dvp-key-procedure__ul_cyt_1kt_2dc">
|
||
<li class="- topic/li li" data-ofbid="d92869e200__20250519091514">
|
||
<dl class="- topic/dl dl simple" id="dvp-key-procedure__dl_dyt_1kt_2dc" data-ofbid="dvp-key-procedure__dl_dyt_1kt_2dc">
|
||
|
||
<dt class="- topic/dt dt dlterm" data-ofbid="d92869e206__20250519091514">“异常！DVP 同时使用了两个 Buf”</dt>
|
||
<dd class="- topic/dd dd">
|
||
<p class="- topic/p p" data-ofbid="d92869e211__20250519091514">理论上不应该发生，可认为是一种异常，但因为 DVP 此时正在向 Buf 写数据，所以先不执行
|
||
stop，软件上报错。</p>
|
||
</dd>
|
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|
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</dl>
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</li>
|
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<li class="- topic/li li" data-ofbid="d92869e218__20250519091514">
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<dl class="- topic/dl dl simple" id="dvp-key-procedure__dl_eyt_1kt_2dc" data-ofbid="dvp-key-procedure__dl_eyt_1kt_2dc">
|
||
|
||
<dt class="- topic/dt dt dlterm" data-ofbid="d92869e224__20250519091514">“DVP 在使用”</dt>
|
||
<dd class="- topic/dd dd">
|
||
<p class="- topic/p p" data-ofbid="d92869e229__20250519091514">表示 “DVP 控制器硬件正在使用”。</p>
|
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</dd>
|
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</dl>
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</li>
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</ul>
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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="#dvp-key-procedure__section_hfd_hpf_fdc" data-tocid="dvp-key-procedure__section_hfd_hpf_fdc">初始化流程</a></div></li><li class="section-item"><div class="section-title"><a href="#dvp-key-procedure__section_nq5_wpt_2dc" data-tocid="dvp-key-procedure__section_nq5_wpt_2dc">Buf 管理</a></div></li><li class="section-item"><div class="section-title"><a href="#dvp-key-procedure__section_vst_xym_4dc" data-tocid="dvp-key-procedure__section_vst_xym_4dc">中断处理流程</a></div></li></ul></div>
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