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64 lines
2.2 KiB
Markdown
64 lines
2.2 KiB
Markdown
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# Using camera
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Applicable platforms: STM32MP135-DK.
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Video from the camera can be tested in the *demo* configuration, with
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the *yavta* tool.
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First you have to configure Video4Linux using the `media-ctl` command.
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The configuration depends on your camera, if your camera board is the MB1723
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then the camera sensor is an *OV5640* on the other hand if your camera board is the
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MB1897 the camera is a *GC2145*.
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## GC2145 Sensor
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```
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# media-ctl -d /dev/media0 --set-v4l2 "'gc2145 1-003c':0[RGB565_2X8_BE/640x480@1/30 field:none]"
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# media-ctl -d /dev/media0 --set-v4l2 "'dcmipp_parallel':0[RGB565_2X8_BE/640x480]"
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# media-ctl -d /dev/media0 --set-v4l2 "'dcmipp_parallel':1[RGB565_2X8_BE/640x480]"
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# media-ctl -d /dev/media0 --set-v4l2 "'dcmipp_dump_postproc':1[fmt:RGB565_2X8_LE/640x480]" -v
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# media-ctl -d /dev/media0 --set-v4l2 "'dcmipp_dump_postproc':1[crop:(0,0)/640x480]" -v
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```
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## OV5640 Sensor
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You first need to apply some changes to the Device Tree of the
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STM32MP135-DK board, in order to change from the GC2145 sensor
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(default) to the OV5640. The changes consist in:
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1. Enabling the OV5640
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2. Disabling the GC2145
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3. Changing the description of the endpoints used for the camera
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pipeline to connect the CSI-to-parallel bridge to the OV5640 instead
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of the GC2145.
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The changes are described in the patch at
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https://gist.github.com/tpetazzoni/63f6c29337111d64a2cf35ed8d42104b.
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```
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# media-ctl -d /dev/media0 --set-v4l2 "'ov5640 1-003c':0[fmt:RGB565_2X8_LE/640x480@1/30 field:none]"
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# media-ctl -d /dev/media0 --set-v4l2 "'dcmipp_parallel':0[fmt:RGB565_2X8_LE/640x480]"
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# media-ctl -d /dev/media0 --set-v4l2 "'dcmipp_parallel':1[fmt:RGB565_2X8_LE/640x480]"
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# media-ctl -d /dev/media0 --set-v4l2 "'dcmipp_dump_postproc':1[fmt:RGB565_2X8_LE/640x480]" -v
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# media-ctl -d /dev/media0 --set-v4l2 "'dcmipp_dump_postproc':1[crop:(0,0)/640x480]" -v
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```
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## Capturing frames
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Use for example the Yavta tool, which is integrated into the demo root
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filesystem:
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```
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# yavta -F /dev/video0 --capture=10
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```
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This command captures 10 frame from the camera with the default format and
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resolution.
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You can list the available formats with the following command:
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```
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# yavta -l --enum-formats --enum-inputs /dev/video0
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```
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