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href="../../../topics/chapter-title/chapter-interface-sdk.html" id="concept_nww_hzh_pzb-d5856e4868-link">接口</a><div class="wh-tooltip"><p class="shortdesc">CAN<span class="ph">、CAP</span>、CIR、GPAI、GPIO、I2C、PSADC、PWM 等接口模块的介绍和使用说明。</p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="chapter-safety-d5856e6083" class="topicref" data-id="chapter-safety" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action chapter-safety-d5856e6083-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-safety-sdk.html" id="chapter-safety-d5856e6083-link">安全</a><div class="wh-tooltip"><p class="shortdesc">SPI ENC、CE、eFuse 等安全模块的介绍和使用说明。</p></div></div></div></li></ul></li></ul></div>
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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic topic" 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_faq_lite.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">常见问题</h1><div class="date inPage">15 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 body"><section class="- topic/section section" id="id__section_dfr_yqt_2dc" data-ofbid="id__section_dfr_yqt_2dc"><h2 class="- topic/title title sectiontitle">摄像头初始化失败</h2>
|
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|
||
<div class="- topic/div div section" id="id__id3">
|
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<strong class="+ topic/ph hi-d/b ph b">现象</strong>
|
||
<p class="- topic/p p" data-ofbid="d314130e29__20250121171819">板子启动后，摄像头注册失败，此时 DVP 的注册流程也无法完成。</p></div>
|
||
<div class="- topic/div div section" id="id__id4">
|
||
<strong class="+ topic/ph hi-d/b ph b">原因分析</strong>
|
||
<p class="- topic/p p" data-ofbid="d314130e37__20250121171819">一般情况下，摄像头需要通过 I2C 来访问，所以要确保 I2C 和摄像头两个模块是否打开。</p><ul class="- topic/ul ul simple" id="id__ul_adj_yqt_2dc" data-ofbid="id__ul_adj_yqt_2dc"><li class="- topic/li li" data-ofbid="d314130e40__20250121171819">
|
||
<p class="- topic/p p" data-ofbid="d314130e42__20250121171819">摄像头的打开方法：<a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="dvp_config.html#dvp_configuration__li_wf4_qjt_2dc">打开
|
||
Camera</a>。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d314130e49__20250121171819">
|
||
<p class="- topic/p p" data-ofbid="d314130e51__20250121171819">I2C 的打开方法，请参考 I2C 模块的使用说明。</p>
|
||
</li></ul><p class="- topic/p p" data-ofbid="d314130e54__20250121171819">同时，要确认以下配置是否正确：</p><ol class="- topic/ol ol arabic simple" id="id__ol_bdj_yqt_2dc" data-ofbid="id__ol_bdj_yqt_2dc"><li class="- topic/li li" data-ofbid="d314130e57__20250121171819">
|
||
<p class="- topic/p p" data-ofbid="d314130e59__20250121171819">硬件上，摄像头是连接到哪个 I2C 通道，对应的 menuconfig 配置是否正确，配置参见 <a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="dvp_config.html#dvp_configuration__li_wf4_qjt_2dc">打开 Camera</a></p>
|
||
</li><li class="- topic/li li" data-ofbid="d314130e65__20250121171819">
|
||
<p class="- topic/p p" data-ofbid="d314130e67__20250121171819">摄像头的供电、复位 IO 是否配置正常，也参见<a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="dvp_config.html#dvp_configuration__li_wf4_qjt_2dc">打开
|
||
Camera</a>。</p>
|
||
</li></ol></div>
|
||
</section><section class="- topic/section section" id="id__section_r41_s1n_4dc" data-ofbid="id__section_r41_s1n_4dc"><h2 class="- topic/title title sectiontitle">画面不够流畅</h2>
|
||
|
||
<div class="- topic/div div section" id="id__id5">
|
||
<strong class="+ topic/ph hi-d/b ph b">现象</strong>
|
||
<p class="- topic/p p" data-ofbid="d314130e85__20250121171819">界面显示的摄像头画面有明显卡顿情况。</p><div class="- topic/div div section" id="id__id7">
|
||
<strong class="+ topic/ph hi-d/b ph b">原因分析</strong>
|
||
<p class="- topic/p p" data-ofbid="d314130e92__20250121171819">很可能是 OS 的调度不够及时导致，导致 DVP 的帧采集不连续。</p></div><div class="- topic/div div section" id="id__id8">
|
||
<strong class="+ topic/ph hi-d/b ph b">解决方法</strong>
|
||
<ol class="- topic/ol ol arabic simple" id="id__ol_cdj_yqt_2dc" data-ofbid="id__ol_cdj_yqt_2dc"><li class="- topic/li li" data-ofbid="d314130e100__20250121171819">
|
||
<p class="- topic/p p" data-ofbid="d314130e102__20250121171819">如果 DVP 驱动中的调试信息打开了，每一帧数据处理都有输出 log，会影响帧率，需要关掉。提升 log 级别即可。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d314130e105__20250121171819">
|
||
<p class="- topic/p p" data-ofbid="d314130e107__20250121171819">尝试增加 <code class="+ topic/ph pr-d/codeph ph codeph">test_dvp</code> 中的 buffer 数量，保证 buf 队列中有充裕的空闲 buf。</p>
|
||
</li></ol></div></div>
|
||
</section><section class="- topic/section section" id="id__section_tnv_1rt_2dc" data-ofbid="id__section_tnv_1rt_2dc"><h2 class="- topic/title title sectiontitle">画面被矩形切割</h2>
|
||
|
||
<div class="- topic/div div section" id="id__id9">
|
||
<div class="- topic/div div section" id="id__id10">
|
||
<strong class="+ topic/ph hi-d/b ph b">现象</strong>
|
||
<p class="- topic/p p" data-ofbid="d314130e126__20250121171819">从摄像头采集并回显到屏幕，画面出现被矩形切割成多份，如下图</p><figure class="- topic/fig fig fignone" id="id__fig_ddj_yqt_2dc" data-ofbid="id__fig_ddj_yqt_2dc"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="id__image_edj_yqt_2dc" src="../../../images/dvp/fr_too_bigger.png" alt="fr_too_bigger"/></div><br/></figure>
|
||
</div>
|
||
<div class="- topic/div div section" id="id__id11">
|
||
<strong class="+ topic/ph hi-d/b ph b">原因分析</strong>
|
||
<p class="- topic/p p" data-ofbid="d314130e139__20250121171819">摄像头内部会根据 CLK_OUT 产生一个 pixclk，</p><ol class="- topic/ol ol arabic simple" id="id__ol_fdj_yqt_2dc" data-ofbid="id__ol_fdj_yqt_2dc"><li class="- topic/li li" data-ofbid="d314130e142__20250121171819">
|
||
<p class="- topic/p p" data-ofbid="d314130e144__20250121171819"> pixclk 的驱动能力有上限值，由驱动芯片决定 </p>
|
||
</li><li class="- topic/li li" data-ofbid="d314130e147__20250121171819">
|
||
<p class="- topic/p p" data-ofbid="d314130e149__20250121171819">pixclk 的频率值由分辨率、帧率决定，分辨率、帧率越高需要的 pixclk 也越高</p>
|
||
</li><li class="- topic/li li" data-ofbid="d314130e152__20250121171819">
|
||
<p class="- topic/p p" data-ofbid="d314130e154__20250121171819">相应的， pixclk 的频率值越高，要求驱动能力也要越高</p>
|
||
</li></ol><p class="- topic/p p" data-ofbid="d314130e157__20250121171819">比如 D13x 开发板上驱动芯片只能支持 pixclk 到最高 50 MHz，如果预期的 pixclk 超出 50 MHz
|
||
就会导致同步信号发生异常，于是画面出现不对齐的情况。</p></div>
|
||
<div class="- topic/div div section" id="id__id12">
|
||
<strong class="+ topic/ph hi-d/b ph b">解决方法</strong>
|
||
<p class="- topic/p p" data-ofbid="d314130e165__20250121171819">调低摄像头驱动中的帧率、分辨率配置。以 OV5640 为例，可调整以下配置参数（详见
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">drv_ov5640.c</span>）： </p></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="#id__section_dfr_yqt_2dc" data-tocid="id__section_dfr_yqt_2dc">摄像头初始化失败</a></div></li><li class="section-item"><div class="section-title"><a href="#id__section_r41_s1n_4dc" data-tocid="id__section_r41_s1n_4dc">画面不够流畅</a></div></li><li class="section-item"><div class="section-title"><a href="#id__section_tnv_1rt_2dc" data-tocid="id__section_tnv_1rt_2dc">画面被矩形切割</a></div></li></ul></div>
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