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[FAQ] [参考译文] [常见问题解答]基于 V4L2的应用无法从探测 CSI 传感器捕获图像的常见原因是什么？

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Guru**** 1670750 points
Other Parts Discussed in Thread: AM67, AM62A7-Q1
请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1403218/faq-what-are-the-common-reasons-v4l2-based-applications-fail-to-capture-images-from-a-probed-csi-sensor

器件型号：AM62A7
Thread 中讨论的其他器件：AM67、

工具与软件：

我将 CSI 摄像头连接到板、并且传感器已成功探测、但无法通过摄像头捕捉图像。 "v4l2-ctl --stream-mmap"、"yavta -c"或"gst-launch-1.0 v4l2src"均无法捕获图像。 我可能错过了什么？

其他器件： AM62A3、 AM62A3-Q1、AM62A7-Q1、AM67、  AM68A、 AM69A

  • 0
    TI__Guru**** 1670750 points
    请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。

      摄像头采集失败的原因可能有多种。

    1.检查视频设备节点

    确保使用正确的视频设备节点进行采集。 请参阅此常见问题解答：

    2.检查链路频率  

    需要正确配置传感器和 D-PHY 的链路频率。 参考： https://docs.kernel.org/driver-api/media/tx-rx.html#pixel-rate。 

      3.配置介质图形  

      导致捕获失败的最常见错误是介质图形配置不正确。 探测传感器后、需要用户空间正确设置介质图中的实体和布线。 例如、下面是在 AM62A 上探测 IMX219传感器后的介质图： 

      root@am62axx-evm:~# media-ctl -p -d /dev/media0
Media controller API version 6.6.32
 
Media device information
------------------------
driver          j721e-csi2rx
model           TI-CSI2RX
serial
bus info        platform:30102000.ticsi2rx
hw revision     0x1
driver version  6.6.32
 
Device topology
- entity 1: 30102000.ticsi2rx (7 pads, 7 links, 1 route)
            type V4L2 subdev subtype Unknown flags 0
            device node name /dev/v4l-subdev0
        routes:
                0/0 -> 1/0 [ACTIVE]
        pad0: Sink
                [stream:0 fmt:UYVY8_1X16/640x480 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:lim-range]
                <- "cdns_csi2rx.30101000.csi-bridge":1 [ENABLED,IMMUTABLE]
        pad1: Source
                [stream:0 fmt:UYVY8_1X16/640x480 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:lim-range]
                -> "30102000.ticsi2rx context 0":0 [ENABLED,IMMUTABLE]
        pad2: Source
                -> "30102000.ticsi2rx context 1":0 [ENABLED,IMMUTABLE]
        pad3: Source
                -> "30102000.ticsi2rx context 2":0 [ENABLED,IMMUTABLE]
        pad4: Source
                -> "30102000.ticsi2rx context 3":0 [ENABLED,IMMUTABLE]
        pad5: Source
                -> "30102000.ticsi2rx context 4":0 [ENABLED,IMMUTABLE]
        pad6: Source
                -> "30102000.ticsi2rx context 5":0 [ENABLED,IMMUTABLE]
 
- entity 9: cdns_csi2rx.30101000.csi-bridge (5 pads, 2 links, 1 route)
            type V4L2 subdev subtype Unknown flags 0
            device node name /dev/v4l-subdev1
        routes:
                0/0 -> 1/0 [ACTIVE]
        pad0: Sink
                [stream:0 fmt:UYVY8_1X16/640x480 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:lim-range]
                <- "imx219 4-0010":0 [ENABLED,IMMUTABLE]
        pad1: Source
                [stream:0 fmt:UYVY8_1X16/640x480 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:lim-range]
                -> "30102000.ticsi2rx":0 [ENABLED,IMMUTABLE]
        pad2: Source
        pad3: Source
        pad4: Source
 
- entity 15: imx219 4-0010 (1 pad, 1 link, 0 routes)
             type V4L2 subdev subtype Sensor flags 0
             device node name /dev/v4l-subdev2
        pad0: Source
                [stream:0 fmt:SRGGB10_1X10/3280x2464 field:none colorspace:raw xfer:none quantization:full-range
                 crop.bounds:(8,8)/3280x2464
                 crop:(8,8)/3280x2464]
                -> "cdns_csi2rx.30101000.csi-bridge":0 [ENABLED,IMMUTABLE]

      请注意、"imx219 4-0010"的格式与"cdns_csi2rx.30101000.csi-bridge"和"30102000.ticsi2rx"的格式不同。 这种格式不匹配会妨碍图像捕捉正常运行。

      要解决此问题、请运行以下命令以更改三个实体之间的格式： 

      root@am62axx-evm:~# media-ctl -V '"imx219 4-0010":0 [fmt:SRGGB8_1X8/1920x1080 field:none]'
root@am62axx-evm:~# media-ctl -V '"cdns_csi2rx.30101000.csi-bridge":0 [fmt:SRGGB8_1X8/1920x1080 field:none]'
root@am62axx-evm:~# media-ctl -V '"30102000.ticsi2rx":0 [fmt:SRGGB8_1X8/1920x1080 field:none]'

      现在重新运行"media-ctl -p"命令以验证整个媒体图的图像格式是否相同： 

      root@am62axx-evm:~# media-ctl -p
Media controller API version 6.6.32
 
Media device information
------------------------
driver          j721e-csi2rx
model           TI-CSI2RX
serial
bus info        platform:30102000.ticsi2rx
hw revision     0x1
driver version  6.6.32
 
Device topology
- entity 1: 30102000.ticsi2rx (7 pads, 7 links, 1 route)
            type V4L2 subdev subtype Unknown flags 0
            device node name /dev/v4l-subdev0
        routes:
                0/0 -> 1/0 [ACTIVE]
        pad0: Sink
                [stream:0 fmt:SRGGB8_1X8/1920x1080 field:none]
                <- "cdns_csi2rx.30101000.csi-bridge":1 [ENABLED,IMMUTABLE]
        pad1: Source
                [stream:0 fmt:SRGGB8_1X8/1920x1080 field:none]
                -> "30102000.ticsi2rx context 0":0 [ENABLED,IMMUTABLE]
        pad2: Source
                -> "30102000.ticsi2rx context 1":0 [ENABLED,IMMUTABLE]
        pad3: Source
                -> "30102000.ticsi2rx context 2":0 [ENABLED,IMMUTABLE]
        pad4: Source
                -> "30102000.ticsi2rx context 3":0 [ENABLED,IMMUTABLE]
        pad5: Source
                -> "30102000.ticsi2rx context 4":0 [ENABLED,IMMUTABLE]
        pad6: Source
                -> "30102000.ticsi2rx context 5":0 [ENABLED,IMMUTABLE]
 
- entity 9: cdns_csi2rx.30101000.csi-bridge (5 pads, 2 links, 1 route)
            type V4L2 subdev subtype Unknown flags 0
            device node name /dev/v4l-subdev1
        routes:
                0/0 -> 1/0 [ACTIVE]
        pad0: Sink
                [stream:0 fmt:SRGGB8_1X8/1920x1080 field:none]
                <- "imx219 4-0010":0 [ENABLED,IMMUTABLE]
        pad1: Source
                [stream:0 fmt:SRGGB8_1X8/1920x1080 field:none]
                -> "30102000.ticsi2rx":0 [ENABLED,IMMUTABLE]
        pad2: Source
        pad3: Source
        pad4: Source
 
- entity 15: imx219 4-0010 (1 pad, 1 link, 0 routes)
             type V4L2 subdev subtype Sensor flags 0
             device node name /dev/v4l-subdev2
        pad0: Source
                [stream:0 fmt:SRGGB8_1X8/1920x1080 field:none colorspace:raw xfer:none quantization:full-range
                 crop.bounds:(8,8)/3280x2464
                 crop:(688,700)/1920x1080]
                -> "cdns_csi2rx.30101000.csi-bridge":0 [ENABLED,IMMUTABLE]

      对于具有多个虚拟通道的传感器、请参阅以下有关在媒体图中设置路由的常见问题解答

      有关 CSI 摄像头的其他常见问题、请参阅此常见问题解答：