TQMa62xx - YOCTO Linux BSP documentation

LVDS and Camera

The extlinux.conf generated by this BSP's default configuration will display a menu to choose between a number of different LVDS display and MIPI-CSI camera configurations. The default can be modified by setting the pxe_label_override environment variable:

setenv pxe_label_override 'label' # Set default boot option to 'label'
saveenv # Persist configuration

The following labels are currently defined:

Label	Display	Camera
default	none	none
lvds-tm070jdhg30	Tianma TM070JDHG30	none
lvds-vesa-fhd	Generic VESA FullHD	none
csi-imx327	none	VisionComponents module with IMX327 sensor
csi-ov9281	none	VisionComponents module with OV9281 sensor
lvds-tm070jdhg30-csi-imx327	Tianma TM070JDHG30	VisionComponents module with IMX327 sensor
lvds-tm070jdhg30-csi-ov9281	Tianma TM070JDHG30	VisionComponents module with OV9281 sensor
lvds-vesa-fhd-csi-imx327	Generic VESA FullHD	VisionComponents module with IMX327 sensor
lvds-vesa-fhd-csi-ov9281	Generic VESA FullHD	VisionComponents module with OV9281 sensor

The following commands can be used to capture the camera picture and display it on the display:

For IMX327:

media-ctl -V '"30102000.ticsi2rx":0[fmt:SRGGB10/1280x720]'
media-ctl -V '"cdns_csi2rx.30101000.csi-bridge":0[fmt:SRGGB10/1280x720]'
media-ctl -V '"imx327 1-001a":0[fmt:SRGGB10/1280x720 field:none]'
gst-launch-1.0 v4l2src device=/dev/video0 ! video/x-bayer,format=rggb10le,bpp=10,width=1280,height=720 ! \
  bayer2rgb ! waylandsink sync=false

For OV9281:

media-ctl -V '"30102000.ticsi2rx":0[fmt:Y8_1X8/1280x800]'
media-ctl -V '"cdns_csi2rx.30101000.csi-bridge":0[fmt:Y8_1X8/1280x800]'
media-ctl -V '"ov9281 1-0060":0[fmt:Y8_1X8/1280x800 field:none]'
gst-launch-1.0 v4l2src device=/dev/video0 ! video/x-raw,format=GRAY8,width=1280,height=800 ! \
  videoconvert ! waylandsink sync=false

waylandsink will render the video using Wayland by default. Alternatively, the video can be displayed in fullscreen directly on a Linux framebuffer device by stopping the Wayland compositor with systemctl stop weston.service and replacing waylandsink sync=false with fbdevsink sync=false in the gst-launch-1.0 command.

Note that the TQMa62xx does not have hardware acceleration for the conversion from the Bayer pixel format to RGB. Even when using the optimized bayer2rgbneon plugin provided in our BSP, framerates with the IMX327 are very low.