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< / div > < div class = "- topic/body concept/conbody body conbody" > < section class = "- topic/section section" id = "dvp_debug_guide__section_jxx_tyg_d1c" data-ofbid = "dvp_debug_guide__section_jxx_tyg_d1c" > < h2 class = "- topic/title title sectiontitle" > 调试开关< / h2 >
< ol class = "- topic/ol ol" id = "dvp_debug_guide__ol_otl_bqq_sdc" data-ofbid = "dvp_debug_guide__ol_otl_bqq_sdc" > < li class = "- topic/li li" data-ofbid = "d136838e28__20250121171607" >
< div class = "- topic/div div" >
< div class = "- topic/p p" data-ofbid = "d136838e32__20250121171607" > 在 SDK 根目录下,执行下列命令,进入 kernel
的功能配置界面:< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "dvp_debug_guide__codeblock_wg1_3ml_sdc" data-ofbid = "dvp_debug_guide__codeblock_wg1_3ml_sdc" > make kernel-menuconfig< / pre > < / div >
< p class = "- topic/p p" data-ofbid = "d136838e37__20250121171607" > 或使用简写命令< / p >
< div class = "- topic/p p" data-ofbid = "d136838e40__20250121171607" >
< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "dvp_debug_guide__codeblock_uss_hml_sdc" data-ofbid = "dvp_debug_guide__codeblock_uss_hml_sdc" > make km< / pre >
< / div >
< / div >
< / li > < li class = "- topic/li li" data-ofbid = "d136838e47__20250121171607" >
< div class = "- topic/p p" data-ofbid = "d136838e49__20250121171607" > 在内核配置界面,打开 DVP 模块的 DEBUG
选项:< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "dvp_debug_guide__pre_kxx_tyg_d1c" data-ofbid = "dvp_debug_guide__pre_kxx_tyg_d1c" > Linux
Kernel hacking
Artinchip Debug
[*] DVP driver debug< / pre > < / div >
< / li > < / ol >
< div class = "- topic/p p" data-ofbid = "d136838e55__20250121171607" > 打开 DEBUG 选项后:< ul class = "- topic/ul ul" id = "dvp_debug_guide__ol_ucp_mss_c1c" data-ofbid = "dvp_debug_guide__ol_ucp_mss_c1c" > < li class = "- topic/li li" data-ofbid = "d136838e58__20250121171607" >
< p class = "- topic/p p" data-ofbid = "d136838e60__20250121171607" > 驱动以< code class = "+ topic/ph pr-d/codeph ph codeph" > -O0< / code > 编译。< / p >
< / li > < li class = "- topic/li li" data-ofbid = "d136838e66__20250121171607" >
< p class = "- topic/p p" data-ofbid = "d136838e68__20250121171607" > < span class = "+ topic/keyword pr-d/parmname keyword parmname" > pr_dbg()< / span > 和 < span class = "+ topic/keyword pr-d/parmname keyword parmname" > dev_dbg()< / span > 调试信息会被编译。< / p >
< div class = "- topic/p p" id = "dvp_debug_guide__p_wvf_n3w_mdc" data-ofbid = "dvp_debug_guide__p_wvf_n3w_mdc" > 在系统运行时,如果要打印 < span class = "+ topic/keyword pr-d/parmname keyword parmname" > pr_dbg()< / span > 和
< span class = "+ topic/keyword pr-d/parmname keyword parmname" > dev_dbg()< / span > 信息,还需要调整 < span class = "+ topic/keyword pr-d/parmname keyword parmname" > loglevel< / span > 为
8, 可以通过以下两种方式实现: < ul class = "- topic/ul ul" id = "dvp_debug_guide__ol_vcp_mss_c1c" data-ofbid = "dvp_debug_guide__ol_vcp_mss_c1c" > < li class = "- topic/li li" data-ofbid = "d136838e88__20250121171607" >
< p class = "- topic/p p" data-ofbid = "d136838e90__20250121171607" > 在 < span class = "+ topic/ph sw-d/filepath ph filepath" > board.dts< / span > 中修改
< span class = "+ topic/keyword pr-d/parmname keyword parmname" > bootargs< / span > ,增加
< span class = "+ topic/keyword pr-d/parmname keyword parmname" > “loglevel=8”< / span > < / p >
< / li > < li class = "- topic/li li" data-ofbid = "d136838e101__20250121171607" >
< div class = "- topic/p p" data-ofbid = "d136838e103__20250121171607" > 在板子启动到 Linux Shell
后,执行下列命令:< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "dvp_debug_guide__pre_wcp_mss_c1c" data-ofbid = "dvp_debug_guide__pre_wcp_mss_c1c" > echo8 > /proc/sys/kernel/printk< / pre > < / div >
< / li > < / ul > < / div >
< / li > < / ul > < / div >
< / section > < section class = "- topic/section section" id = "dvp_debug_guide__section_oxx_tyg_d1c" data-ofbid = "dvp_debug_guide__section_oxx_tyg_d1c" > < h2 class = "- topic/title title sectiontitle" > Sysfs 节点< / h2 >
< div class = "- topic/p p" data-ofbid = "d136838e115__20250121171607" >
< ol class = "- topic/ol ol" id = "dvp_debug_guide__ol_pwb_wyg_d1c" data-ofbid = "dvp_debug_guide__ol_pwb_wyg_d1c" > < li class = "- topic/li li" data-ofbid = "d136838e118__20250121171607" >
< div class = "- topic/p p" data-ofbid = "d136838e120__20250121171607" > 在 Sysfs 中查看 video 设备的信息:< ul class = "- topic/ul ul" id = "dvp_debug_guide__ul_cnf_l1m_sdc" data-ofbid = "dvp_debug_guide__ul_cnf_l1m_sdc" > < li class = "- topic/li li" data-ofbid = "d136838e123__20250121171607" > 查看 < code class = "+ topic/ph pr-d/codeph ph codeph" > /dev/video0< / code >
设备的信息:< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "dvp_debug_guide__codeblock_nyq_wyg_d1c" data-ofbid = "dvp_debug_guide__codeblock_nyq_wyg_d1c" > ls /dev/video0 -l< / pre > < div class = "- topic/p p" data-ofbid = "d136838e130__20250121171607" > 输出结果示例如下,其中主设备号为
81, 次设备号为
0: < pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "dvp_debug_guide__codeblock_gx2_31m_sdc" data-ofbid = "dvp_debug_guide__codeblock_gx2_31m_sdc" > crw------- < span class = "hl-number" > 1< / span > root root < span class = "hl-number" > 81< / span > , < span class = "hl-number" > 0< / span > Jan < span class = "hl-number" > 1< / span > < span class = "hl-number" > 1970< / span > /dev/video0< / pre > < / div > < / li > < li class = "- topic/li li" data-ofbid = "d136838e134__20250121171607" > 查看 < code class = "+ topic/ph pr-d/codeph ph codeph" > /sys/class/video4linux/v4l-subdev0/< / code >
目录中的文件,了解视频子设备的详细信息:< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "dvp_debug_guide__codeblock_ozv_31m_sdc" data-ofbid = "dvp_debug_guide__codeblock_ozv_31m_sdc" > ls /sys/class/video4linux/v4l-subdev0/< / pre > < div class = "- topic/p p" data-ofbid = "d136838e141__20250121171607" > 输出结果示例如下:< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "dvp_debug_guide__codeblock_mbd_j1m_sdc" data-ofbid = "dvp_debug_guide__codeblock_mbd_j1m_sdc" > dev dev_debug device index name subsystem uevent< / pre > < / div > < / li > < li class = "- topic/li li" data-ofbid = "d136838e145__20250121171607" > 通过 < code class = "+ topic/ph pr-d/codeph ph codeph" > cat< / code > 命令查看特定文件的内容,例如 < code class = "+ topic/ph pr-d/codeph ph codeph" > name< / code >
文件:< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "dvp_debug_guide__codeblock_sdm_j1m_sdc" data-ofbid = "dvp_debug_guide__codeblock_sdm_j1m_sdc" > cat /sys/class/video4linux/v4l-subdev0/name< / pre > < p class = "- topic/p p" data-ofbid = "d136838e155__20250121171607" > 输出结果示例如下,表示视频子设备的名称是
< code class = "+ topic/ph pr-d/codeph ph codeph" > ov5640
3-003c< / code > : < / p > < pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "dvp_debug_guide__codeblock_wft_j1m_sdc" data-ofbid = "dvp_debug_guide__codeblock_wft_j1m_sdc" > ov5640 < span class = "hl-number" > 3< / span > -< span class = "hl-number" > 003< / span > c< / pre > < / li > < li class = "- topic/li li" data-ofbid = "d136838e162__20250121171607" >
< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "dvp_debug_guide__codeblock_sdb_k1m_sdc" data-ofbid = "dvp_debug_guide__codeblock_sdb_k1m_sdc" > cat /sys/class/video4linux/v4l-subdev1/name< / pre >
< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "dvp_debug_guide__codeblock_s3j_k1m_sdc" data-ofbid = "dvp_debug_guide__codeblock_s3j_k1m_sdc" > aic-dvp-sd< / pre >
< / li > < li class = "- topic/li li" data-ofbid = "d136838e170__20250121171607" >
< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "dvp_debug_guide__codeblock_jrp_k1m_sdc" data-ofbid = "dvp_debug_guide__codeblock_jrp_k1m_sdc" > ls -l /sys/class/video4linux/< / pre >
< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "dvp_debug_guide__codeblock_dsw_k1m_sdc" data-ofbid = "dvp_debug_guide__codeblock_dsw_k1m_sdc" > lrwxrwxrwx < span class = "hl-number" > 1< / span > root root < span class = "hl-number" > 0< / span > Jan < span class = "hl-number" > 1< / span > < span class = "hl-number" > 00< / span > :< span class = "hl-number" > 12< / span > v4l-subdev0 -> ../../devices/platform/soc/< span class = "hl-number" > 99223000.< / span > i2c/i2c-< span class = "hl-number" > 3< / span > /< span class = "hl-number" > 3< / span > -< span class = "hl-number" > 003< / span > c/video4linux/v4l-subdev0
lrwxrwxrwx < span class = "hl-number" > 1< / span > root root < span class = "hl-number" > 0< / span > Jan < span class = "hl-number" > 1< / span > < span class = "hl-number" > 00< / span > :< span class = "hl-number" > 12< / span > v4l-subdev1 -> ../../devices/platform/soc/< span class = "hl-number" > 98830000.< / span > dvp/video4linux/v4l-subdev1
lrwxrwxrwx < span class = "hl-number" > 1< / span > root root < span class = "hl-number" > 0< / span > Jan < span class = "hl-number" > 1< / span > < span class = "hl-number" > 00< / span > :< span class = "hl-number" > 12< / span > video0 -> ../../devices/platform/soc/< span class = "hl-number" > 98830000.< / span > dvp/video4linux/video0< / pre >
< / li > < / ul > < / div >
< / li > < li class = "- topic/li li" data-ofbid = "d136838e179__20250121171607" >
< p class = "- topic/p p" data-ofbid = "d136838e181__20250121171607" > 向对应的 Sysfs 节点写入一个整数值,修改 debug level, 打开 V4L2 的 debug 开关。< / p >
< div class = "- topic/p p" data-ofbid = "d136838e184__20250121171607" > 例如,设置不同的模块和设备的 Debug 级别为
3( 即显示所有调试信息) : < pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "dvp_debug_guide__codeblock_rsr_yyg_d1c" data-ofbid = "dvp_debug_guide__codeblock_rsr_yyg_d1c" > echo < span class = "hl-number" > 0x3< / span > > /sys/module/videobuf2_v4l2/parameters/debug
echo < span class = "hl-number" > 0x3< / span > > /sys/module/videobuf2_common/parameters/debug
echo < span class = "hl-number" > 0x3< / span > > /sys/devices/platform/soc/< span class = "hl-number" > 18830000.< / span > dvp/video4linux/v4l-subdev1/dev_debug
echo < span class = "hl-number" > 0x3< / span > > /sys/devices/platform/soc/< span class = "hl-number" > 18830000.< / span > dvp/video4linux/video0/dev_debug
< / pre > < / div >
< p class = "- topic/p p" data-ofbid = "d136838e189__20250121171607" > V4L2 子系统使用 < span class = "+ topic/keyword pr-d/apiname keyword apiname" > dprintk(level)< / span > 接口来控制调试信息。当
< span class = "+ topic/keyword pr-d/apiname keyword apiname" > dprintk(level)< / span > 中的 level 值大于代码中的
< span class = "+ topic/keyword pr-d/apiname keyword apiname" > dprintk(level)< / span > 调用的 level
值即可打印信息。< span class = "+ topic/keyword pr-d/apiname keyword apiname" > dprintk()< / span > 一般用到两个 debug level: < / p >
< div class = "table-container" > < table class = "- topic/table table frame-all" id = "dvp_debug_guide__table_rxx_tyg_d1c" data-ofbid = "dvp_debug_guide__table_rxx_tyg_d1c" data-cols = "2" > < caption > < / caption > < colgroup > < col style = "width:25.510204081632654%" / > < col style = "width:74.48979591836735%" / > < / colgroup > < tbody class = "- topic/tbody tbody" > < tr class = "- topic/row" > < td class = "- topic/entry entry colsep-1 rowsep-1" > 1< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" > 显示 ioctl 名称< / td > < / tr > < tr class = "- topic/row" > < td class = "- topic/entry entry colsep-1 rowsep-0" > 2< / td > < td class = "- topic/entry entry colsep-0 rowsep-0" > 显示 API 的传入参数< / td > < / tr > < / tbody > < / table > < / div >
< / li > < li class = "- topic/li li" data-ofbid = "d136838e220__20250121171607" > 查看 DVP 的 Buf 队列情况< p class = "- topic/p p" data-ofbid = "d136838e222__20250121171607" > DVP 驱动中实现了一个 sysfs 节点 buflist, 查看当前三个 Qbuf、DQbuf、DVP 驱动中的
buf list
状态:< / p > < pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "dvp_debug_guide__pre_uxx_tyg_d1c" data-ofbid = "dvp_debug_guide__pre_uxx_tyg_d1c" > cat /sys/devices/platform/soc/< span class = "hl-number" > 18830000.< / span > dvp/buflist< / pre > < div class = "- topic/p p" data-ofbid = "d136838e226__20250121171607" > 输出结果示例如下,表示当前
DVP 驱动中的缓冲区列表状态,其中 Q-buf 和 DQ-buf 列表均为空,而 D-buf
列表中的所有缓冲区都处于完成状态:< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "dvp_debug_guide__codeblock_vsq_hbm_sdc" data-ofbid = "dvp_debug_guide__codeblock_vsq_hbm_sdc" > In dvp-> buf_list, the current buf < strong class = "+ topic/ph hi-d/b ph b" > in< / strong > list:
[< span class = "hl-number" > 0< / span > ]: empty
[< span class = "hl-number" > 1< / span > ]: empty
[< span class = "hl-number" > 2< / span > ]: empty
In V4L2 Q-buf list:
[< span class = "hl-number" > 0< / span > ]: empty
[< span class = "hl-number" > 1< / span > ]: empty
[< span class = "hl-number" > 2< / span > ]: empty
In V4L2 DQ-buf list:
[< span class = "hl-number" > 0< / span > ], state: Done
[< span class = "hl-number" > 1< / span > ], state: Done
[< span class = "hl-number" > 2< / span > ], state: Done
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< / section > < section class = "- topic/section section" id = "dvp_debug_guide__section_vxx_tyg_d1c" data-ofbid = "dvp_debug_guide__section_vxx_tyg_d1c" > < h2 class = "- topic/title title sectiontitle" > V4L2 相关的其他工具< / h2 >
< ul class = "- topic/ul ul" id = "dvp_debug_guide__ul_wxx_tyg_d1c" data-ofbid = "dvp_debug_guide__ul_wxx_tyg_d1c" > < li class = "- topic/li li" data-ofbid = "d136838e241__20250121171607" >
< p class = "- topic/p p" data-ofbid = "d136838e243__20250121171607" > V4l2-ctl, v4l2 的命令行工具,用于管理和控制 Linux 系统中的视频设备。< / p >
< / li > < li class = "- topic/li li" data-ofbid = "d136838e246__20250121171607" >
< p class = "- topic/p p" data-ofbid = "d136838e248__20250121171607" > V4l2 兼容性测试< / p >
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< p class = "- topic/p p" data-ofbid = "d136838e253__20250121171607" > V4l2-dbg, < / p >
< / li > < li class = "- topic/li li" data-ofbid = "d136838e256__20250121171607" >
< p class = "- topic/p p" data-ofbid = "d136838e258__20250121171607" > qv4l2, QT 测试程序< / 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_debug_guide__section_jxx_tyg_d1c" data-tocid = "dvp_debug_guide__section_jxx_tyg_d1c" > 调试开关< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#dvp_debug_guide__section_oxx_tyg_d1c" data-tocid = "dvp_debug_guide__section_oxx_tyg_d1c" > Sysfs 节点< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#dvp_debug_guide__section_vxx_tyg_d1c" data-tocid = "dvp_debug_guide__section_vxx_tyg_d1c" > V4L2 相关的其他工具< / a > < / div > < / li > < / ul > < / div >
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