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< div class = "date inPage" > 9 Apr 2025< / div > < div style = "color: gray;" >
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Read time: 1 minute(s)
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< 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" >
< strong class = "+ topic/ph hi-d/b ph b" > 现象< / strong >
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< p class = "- topic/p p" data-ofbid = "d169755e38__20250409171050" > 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 >
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< div class = "- topic/div div section" id = "id__id4" >
< 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 = "d169755e46__20250409171050" > 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 = "d169755e50__20250409171050" >
< p class = "- topic/p p" data-ofbid = "d169755e52__20250409171050" > 摄像头的打开方法：< a class = "- topic/xref xref" href = "dvp_config_lite.html#id__li_wf4_qjt_2dc" > 打开
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Camera< / a > 。< / p >
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< / li >
< li class = "- topic/li li" data-ofbid = "d169755e60__20250409171050" >
< p class = "- topic/p p" data-ofbid = "d169755e62__20250409171050" > 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 = "d169755e66__20250409171050" > 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 = "d169755e70__20250409171050" >
< p class = "- topic/p p" data-ofbid = "d169755e72__20250409171050" > 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 class = "- topic/xref xref" href = "dvp_config_lite.html#id__li_wf4_qjt_2dc" > 打开 Camera< / a > < / p >
< / li >
< li class = "- topic/li li" data-ofbid = "d169755e79__20250409171050" >
< p class = "- topic/p p" data-ofbid = "d169755e81__20250409171050" > 摄像头的供电、复位 IO 是否配置正常，也参见< a class = "- topic/xref xref" href = "dvp_config_lite.html#id__li_wf4_qjt_2dc" > 打开
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Camera< / a > 。< / p >
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< / 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 >
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< div class = "- topic/div div section" id = "id__id5" >
< strong class = "+ topic/ph hi-d/b ph b" > 现象< / strong >
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< p class = "- topic/p p" data-ofbid = "d169755e101__20250409171050" > 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" >
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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 = "d169755e108__20250409171050" > 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" >
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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 = "id__ol_cdj_yqt_2dc" data-ofbid = "id__ol_cdj_yqt_2dc" >
< li class = "- topic/li li" data-ofbid = "d169755e117__20250409171050" >
< p class = "- topic/p p" data-ofbid = "d169755e119__20250409171050" > 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 = "d169755e123__20250409171050" >
< p class = "- topic/p p" data-ofbid = "d169755e125__20250409171050" > 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 >
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< 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 >
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< p class = "- topic/p p" data-ofbid = "d169755e146__20250409171050" > 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 / >
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< / div >
< div class = "- topic/div div section" id = "id__id11" >
< 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 = "d169755e163__20250409171050" > 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 = "d169755e167__20250409171050" >
< p class = "- topic/p p" data-ofbid = "d169755e169__20250409171050" > 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 = "d169755e173__20250409171050" >
< p class = "- topic/p p" data-ofbid = "d169755e175__20250409171050" > 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 = "d169755e179__20250409171050" >
< p class = "- topic/p p" data-ofbid = "d169755e181__20250409171050" > 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 = "d169755e185__20250409171050" > 比如 D13x 开发板上驱动芯片只能支持 pixclk 到最高 50 MHz，
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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 >
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< p class = "- topic/p p" data-ofbid = "d169755e193__20250409171050" > 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
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< span class = "+ topic/ph sw-d/filepath ph filepath" > drv_ov5640.c< / span > ） ： < / p > < / div >
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