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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/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><div class="date inPage">15 Jan 2024</div><div style="color: gray;">
                    Read time: 1 minute(s)
                </div><div class="- topic/body concept/conbody body conbody"><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="d87670e29__20250121171529">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="d87670e33__20250121171529">
                    <p class="- topic/p p" data-ofbid="d87670e35__20250121171529">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="d87670e41__20250121171529">
                    <p class="- topic/p p" data-ofbid="d87670e43__20250121171529">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="d87670e55__20250121171529">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="d87670e59__20250121171529">初始化 Buf 队列。</li><li class="- topic/li li" data-ofbid="d87670e61__20250121171529">分配和释放 Buf。</li><li class="- topic/li li" data-ofbid="d87670e63__20250121171529">将 Buf 添加到空闲队列或工作队列。</li></ul>
            <p class="- topic/p p" data-ofbid="d87670e66__20250121171529">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="d87670e79__20250121171529">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="d87670e90__20250121171529">
                        <p class="- topic/p p" data-ofbid="d87670e92__20250121171529"><span class="+ topic/ph ui-d/uicontrol ph uicontrol">HNUM Interrupt</span></p>
                        <p class="- topic/p p" data-ofbid="d87670e96__20250121171529">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="d87670e102__20250121171529">
                        <p class="- topic/p p" data-ofbid="d87670e104__20250121171529"><span class="+ topic/ph ui-d/uicontrol ph uicontrol">Frame done</span></p>
                        <p class="- topic/p p" data-ofbid="d87670e108__20250121171529">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="d87670e115__20250121171529">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="d87670e124__20250121171529">
                    <span class="+ topic/keyword pr-d/parmname keyword parmname">HNUM Interrupt -&gt; Framedone -&gt; HNUM Interrupt -&gt; Frame done
                        -&gt; HNUM Interrupt -&gt; 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="d87670e138__20250121171529">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="d87670e141__20250121171529">“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="d87670e149__20250121171529">
                            <div class="- topic/p p" data-ofbid="d87670e151__20250121171529">“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="d87670e161__20250121171529">
                                    <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="d87670e165__20250121171529">“异常！DVP 同时使用了两个 Buf”</dt><dd class="- topic/dd dd">
                                                <p class="- topic/p p" data-ofbid="d87670e169__20250121171529">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></dl>
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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="d87670e177__20250121171529">“DVP 在使用”</dt><dd class="- topic/dd dd">
                                                <p class="- topic/p p" data-ofbid="d87670e181__20250121171529">表示 “DVP 控制器硬件正在使用”。</p>
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