V4L2 error

srinivas_123 — Wed, 24 Jul 2024 09:39:37 GMT

I am using an i.MX 8M Plus custom board and have connected an OV5640 camera to it. After building the imx-image-full image and booting it on the custom board, I confirm the camera's presence using the command v4l2-ctl --list-devices. However, sometimes the camera does not appear when I run this command. Does anyone know why this is happening? Are there any modifications needed?

root@imx8mp-lpddr4-evk:/usr/bin/application# v4l2-ctl --list-devices
mxc-isi-m2m_v1 (platform:32e00000.isi:m2m_devic):
/dev/video2

vsi_v4l2dec (platform:vsi_v4l2dec):
/dev/video1

vsi_v4l2enc (platform:vsi_v4l2enc):
/dev/video0

root@imx8mp-lpddr4-evk:/usr/bin/application# v4l2-ctl --list-devices
():
/dev/v4l-subdev0

FSL Capture Media Device (platform:32c00000.bus:camera):
/dev/media0

mxc-isi-cap_v1 (platform:32e00000.isi:cap_devic):
/dev/video3

mxc-isi-m2m_v1 (platform:32e00000.isi:m2m_devic):
/dev/video2

vsi_v4l2dec (platform:vsi_v4l2dec):
/dev/video1

vsi_v4l2enc (platform:vsi_v4l2enc):
/dev/video0

Regards

srinivas

Re: V4L2 error

pengyong_zhang — Thu, 25 Jul 2024 06:41:29 GMT

hi, @srinivas_123

Sometimes you can see the camera device but sometimes can't,right?

B.R

Re: V4L2 error

srinivas_123 — Mon, 02 Sep 2024 06:24:08 GMT

Hi@pengyong_zhang
yes ,is there any specific reason for showing like this. am i missed any configurations.
Thanks&Regards
srinivas

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