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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_faq.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">常见问题</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"><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>
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<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>
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<p class="- topic/p p" data-ofbid="d305773e32__20250121171812">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="d305773e35__20250121171812"><strong class="+ topic/ph hi-d/b ph b">原因分析</strong></p>
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<div class="- topic/p p" data-ofbid="d305773e39__20250121171812">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"><li class="- topic/li li" data-ofbid="d305773e42__20250121171812">
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<p class="- topic/p p" data-ofbid="d305773e44__20250121171812">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><li class="- topic/li li" data-ofbid="d305773e51__20250121171812">
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<p class="- topic/p p" data-ofbid="d305773e53__20250121171812">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="d305773e57__20250121171812">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="d305773e60__20250121171812">
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<p class="- topic/p p" data-ofbid="d305773e62__20250121171812">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
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</p>
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</li><li class="- topic/li li" data-ofbid="d305773e65__20250121171812">
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<p class="- topic/p p" data-ofbid="d305773e67__20250121171812">摄像头的 I2C 设备地址是否正确，参见 中的参数
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<span class="+ topic/keyword pr-d/parmname keyword parmname">camera@3C</span>。</p>
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</li><li class="- topic/li li" data-ofbid="d305773e73__20250121171812">
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<p class="- topic/p p" data-ofbid="d305773e75__20250121171812">摄像头的供电是否正常。</p>
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</li></ol></div>
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</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>
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<div class="- topic/div div section" id="dvp_common_issues__id5">
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<strong class="+ topic/ph hi-d/b ph b">现象</strong>
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<p class="- topic/p p" data-ofbid="d305773e89__20250121171812">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">
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<strong class="+ topic/ph hi-d/b ph b">原因分析</strong>
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<p class="- topic/p p" data-ofbid="d305773e96__20250121171812">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">
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<strong class="+ topic/ph hi-d/b ph b">解决方法</strong>
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<ol class="- topic/ol ol arabic simple" id="dvp_common_issues__ol_cdj_yqt_2dc" data-ofbid="dvp_common_issues__ol_cdj_yqt_2dc"><li class="- topic/li li" data-ofbid="d305773e104__20250121171812">
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<p class="- topic/p p" data-ofbid="d305773e106__20250121171812">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>
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</li><li class="- topic/li li" data-ofbid="d305773e109__20250121171812">
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<p class="- topic/p p" data-ofbid="d305773e111__20250121171812">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></ol></div></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="#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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