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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 >
< div class = "- topic/div div section" id = "dvp_common_issues__id3" >
< strong class = "+ topic/ph hi-d/b ph b" > 现象< / strong >
< 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
不存在。< / p > < / div >
< p class = "- topic/p p" data-ofbid = "d305773e35__20250121171812" > < strong class = "+ topic/ph hi-d/b ph b" > 原因分析< / strong > < / p >
< 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" >
< 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 >
< / p >
< / li > < li class = "- topic/li li" data-ofbid = "d305773e51__20250121171812" >
< 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 >
< / li > < / ul > < / div >
< 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" >
< 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
< / p >
< / li > < li class = "- topic/li li" data-ofbid = "d305773e65__20250121171812" >
< 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
< span class = "+ topic/keyword pr-d/parmname keyword parmname" > camera@3C< / span > 。< / p >
< / li > < li class = "- topic/li li" data-ofbid = "d305773e73__20250121171812" >
< p class = "- topic/p p" data-ofbid = "d305773e75__20250121171812" > 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 = "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" >
< strong class = "+ topic/ph hi-d/b ph b" > 原因分析< / strong >
< 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" >
< strong class = "+ topic/ph hi-d/b ph b" > 解决方法< / strong >
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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， ， < / p >
< / li > < li class = "- topic/li li" data-ofbid = "d305773e109__20250121171812" >
< 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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< 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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