Thomas Petazzoni
5cd2b9bb19
The new U-Boot no longer adjusts the DT automatically based on the detected camera sensor, so the user has to manually update the DT if the user has the OV5640 sensor. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
2.2 KiB
Using camera
Applicable platforms: STM32MP135-DK.
Video from the camera can be tested in the demo configuration, with the yavta tool.
First you have to configure Video4Linux using the media-ctl command.
The configuration depends on your camera, if your camera board is the MB1723
then the camera sensor is an OV5640 on the other hand if your camera board is the
MB1897 the camera is a GC2145.
GC2145 Sensor
# media-ctl -d /dev/media0 --set-v4l2 "'gc2145 1-003c':0[RGB565_2X8_BE/640x480@1/30 field:none]"
# media-ctl -d /dev/media0 --set-v4l2 "'dcmipp_parallel':0[RGB565_2X8_BE/640x480]"
# media-ctl -d /dev/media0 --set-v4l2 "'dcmipp_parallel':1[RGB565_2X8_BE/640x480]"
# media-ctl -d /dev/media0 --set-v4l2 "'dcmipp_dump_postproc':1[fmt:RGB565_2X8_LE/640x480]" -v
# media-ctl -d /dev/media0 --set-v4l2 "'dcmipp_dump_postproc':1[crop:(0,0)/640x480]" -v
OV5640 Sensor
You first need to apply some changes to the Device Tree of the STM32MP135-DK board, in order to change from the GC2145 sensor (default) to the OV5640. The changes consist in:
-
Enabling the OV5640
-
Disabling the GC2145
-
Changing the description of the endpoints used for the camera pipeline to connect the CSI-to-parallel bridge to the OV5640 instead of the GC2145.
The changes are described in the patch at https://gist.github.com/tpetazzoni/63f6c29337111d64a2cf35ed8d42104b.
# media-ctl -d /dev/media0 --set-v4l2 "'ov5640 1-003c':0[fmt:RGB565_2X8_LE/640x480@1/30 field:none]"
# media-ctl -d /dev/media0 --set-v4l2 "'dcmipp_parallel':0[fmt:RGB565_2X8_LE/640x480]"
# media-ctl -d /dev/media0 --set-v4l2 "'dcmipp_parallel':1[fmt:RGB565_2X8_LE/640x480]"
# media-ctl -d /dev/media0 --set-v4l2 "'dcmipp_dump_postproc':1[fmt:RGB565_2X8_LE/640x480]" -v
# media-ctl -d /dev/media0 --set-v4l2 "'dcmipp_dump_postproc':1[crop:(0,0)/640x480]" -v
Capturing frames
Use for example the Yavta tool, which is integrated into the demo root filesystem:
# yavta -F /dev/video0 --capture=10
This command captures 10 frame from the camera with the default format and resolution.
You can list the available formats with the following command:
# yavta -l --enum-formats --enum-inputs /dev/video0