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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" title="Edit this document" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/dvp/dvp_faq.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">常见问题</h1>
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<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>
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<div class="- topic/body concept/conbody body conbody"><section class="- topic/section section" id="dvp_common_issues__section_ovr_zdh_d1c" data-ofbid="dvp_common_issues__section_ovr_zdh_d1c"><h2 class="- topic/title title sectiontitle">摄像头初始化失败</h2>
|
||
|
||
<div class="- topic/div div section" id="dvp_common_issues__id3">
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<strong class="+ topic/ph hi-d/b ph b">现象</strong>
|
||
<p class="- topic/p p" data-ofbid="d161564e42__20250123155216">板子启动后，摄像头的 V4L2 device 注册失败，此时 DVP 的注册流程也因此不完整，在 Sysfs 中会找不到 /dev/video0
|
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不存在。</p></div>
|
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<p class="- topic/p p" data-ofbid="d161564e45__20250123155216"><strong class="+ topic/ph hi-d/b ph b">原因分析</strong></p>
|
||
<div class="- topic/p p" data-ofbid="d161564e49__20250123155216">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。<ul class="- topic/ul ul" id="dvp_common_issues__ul_qvr_zdh_d1c" data-ofbid="dvp_common_issues__ul_qvr_zdh_d1c">
|
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<li class="- topic/li li" data-ofbid="d161564e53__20250123155216">
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<p class="- topic/p p" data-ofbid="d161564e55__20250123155216">摄像头的打开方法：<a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="dvp_test.html#dvp_test_guide__ol_is1_qzg_d1c">配置 OV5640 摄像头</a>
|
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</p>
|
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</li>
|
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<li class="- topic/li li" data-ofbid="d161564e63__20250123155216">
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<p class="- topic/p p" data-ofbid="d161564e65__20250123155216">I2C 的打开方法，参考 I2C 模块的使用说明。</p>
|
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</li>
|
||
</ul></div>
|
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<div class="- topic/p p" data-ofbid="d161564e70__20250123155216">同时，要确认以下配置是否正确：<ol class="- topic/ol ol" id="dvp_common_issues__ol_rvr_zdh_d1c" data-ofbid="dvp_common_issues__ol_rvr_zdh_d1c">
|
||
<li class="- topic/li li" data-ofbid="d161564e74__20250123155216">
|
||
<p class="- topic/p p" data-ofbid="d161564e76__20250123155216">硬件上，摄像头是连接到哪个 I2C 通道，对应的 DTS 配置是否正确，配置参见 <a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="dvp_test.html#dvp_test_guide__ol_is1_qzg_d1c">配置 OV5640
|
||
摄像头</a>
|
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</p>
|
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</li>
|
||
<li class="- topic/li li" data-ofbid="d161564e84__20250123155216">
|
||
<p class="- topic/p p" data-ofbid="d161564e86__20250123155216">摄像头的 I2C 设备地址是否正确，参见 <a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="dvp_test.html#dvp_test_guide__ol_is1_qzg_d1c">配置 OV5640 摄像头</a> 中的参数
|
||
<span class="+ topic/keyword pr-d/parmname keyword parmname">camera@3C</span>。</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d161564e97__20250123155216">
|
||
<p class="- topic/p p" data-ofbid="d161564e99__20250123155216">摄像头的供电是否正常。</p>
|
||
</li>
|
||
</ol></div>
|
||
|
||
</section>
|
||
<section class="- topic/section section" id="dvp_common_issues__section_r41_s1n_4dc" data-ofbid="dvp_common_issues__section_r41_s1n_4dc"><h2 class="- topic/title title sectiontitle">画面不够流畅</h2>
|
||
|
||
<div class="- topic/div div section" id="dvp_common_issues__id5">
|
||
<strong class="+ topic/ph hi-d/b ph b">现象</strong>
|
||
<p class="- topic/p p" data-ofbid="d161564e115__20250123155216">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="dvp_common_issues__id7">
|
||
<strong class="+ topic/ph hi-d/b ph b">原因分析</strong>
|
||
<p class="- topic/p p" data-ofbid="d161564e122__20250123155216">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="dvp_common_issues__id8">
|
||
<strong class="+ topic/ph hi-d/b ph b">解决方法</strong>
|
||
<ol class="- topic/ol ol arabic simple" id="dvp_common_issues__ol_cdj_yqt_2dc" data-ofbid="dvp_common_issues__ol_cdj_yqt_2dc">
|
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<li class="- topic/li li" data-ofbid="d161564e131__20250123155216">
|
||
<p class="- topic/p p" data-ofbid="d161564e133__20250123155216">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>
|
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<li class="- topic/li li" data-ofbid="d161564e137__20250123155216">
|
||
<p class="- topic/p p" data-ofbid="d161564e139__20250123155216">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>
|
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</li>
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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_common_issues__section_ovr_zdh_d1c" data-tocid="dvp_common_issues__section_ovr_zdh_d1c">摄像头初始化失败</a></div></li><li class="section-item"><div class="section-title"><a href="#dvp_common_issues__section_r41_s1n_4dc" data-tocid="dvp_common_issues__section_r41_s1n_4dc">画面不够流畅</a></div></li></ul></div>
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