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diff --git a/docs/4_Developer_Guides/5_General_setup.md b/docs/4_Developer_Guides/5_General_setup.md new file mode 100644 index 0000000..af05096 --- /dev/null +++ b/docs/4_Developer_Guides/5_General_setup.md @@ -0,0 +1,94 @@ +--- +title: Generic devices setup +--- + +## Camera setup on RPi4 + +This assumes that you'll be using the Raspberry Pi Camera Module, which can +easily hooked on the board using the LVDS connector. Further more information +about how to connect it, could be found at +[Installing a Raspberry Pi camera](https://www.raspberrypi.com/documentation/accessories/camera.html#installing-a-raspberry-pi-camera) + +With the camera installed, you'll need to enable it by editing /boot/config.txt +file (if you're booting an AGL image over a sd-card it will be there by +default, otherwise -- in case of doing netboot, you'll have to create +manually) and add the following entry: + + + ## start_x + ## Set to "1" to enable the camera module. + ## + ## Enabling the camera requires gpu_mem option to be specified with a value + ## of at least 128. + ## + ## Default 0 + ## + start_x=1 + +And reboot your device. Afterwards, after logging it, make sure that you have +the /dev/video0 device created. You could also use v4l2-ctl to verify +that is indeed usable as a capture device: + + $ v4l2-ctl -d /dev/video0 --all + +In order to test out video playback, use the following gstreamer pipeline: + + $ gst-launch-1.0 v4l2src device=/dev/video0 ! \ + video/x-raw,width=640,height=480 ! waylandsink fullscreen=true + +Alternatively, using [camera-gstreamer](https://gerrit.automotivelinux.org/gerrit/gitweb?p=apps/camera-gstreamer.git;a=summary) +application could might be another possibility, but you'll have to build it +yourself and add it in the image. + +This includes an example on how to create a xdg-toplevel surface and create a +gstreamer pipeline, instead of relaying on waylandsink to create one for you, +in a programmatic fashion. + +## Display setup on RPi4 + +This assumes that you'll be using the Raspberry Pi 7'' display. Installation +can be found at [Rpi Display page](https://www.raspberrypi.com/documentation/accessories/display.html). + +If booting over the network, the dtb should already contain the ft5406 dtb, +while booting over sd-card the following show be in the /boot/config.txt +file: + + dtoverlay=rpi-ft5406-overlay + +Once the board boots up, you should get a rainbow like effect and afterwards +booting up would display debug scrolling over. You'll need to adjust the +orientation as the 800x480 is in portrait. Edit /etc/xdg/weston/weston.ini and +add a new output entry, like the following: + + [output] + name=DSI-1 + transform=90 + +Note that for the Qt platform, the homescreen application, together with the +other demo applications, is tailored specifically for a 1080p display and it +will display incorrectly on such a smaller display. + +## Testing out video camera without a real device + +While the above requires having a real video camera device, one can use out +the [vivid module](https://docs.kernel.org/admin-guide/media/vivid.html?highlight=vivid#the-virtual-video-test-driver-vivid) +to try out your custom application or just testing out camera functionality in AGL. + +You should normally have the module present, not loaded, for either **rpi4** or for +**h3ulcb** boards. Load the module, like in the following command: + + modprobe vivid allocators=0x1 + +Have a look at the kernel ring buffer to see what capture devices are created +and use as source: + + $ gst-launch-1.0 v4l2src device=/dev/videoXX ! \ + video/x-raw,width=640,height=480 ! waylandsink fullscreen=true + +making sure to replace /dev/videoXX with correct capture device. You can check +that easily using the v4l2-ctl mentioned above. + +Note that using camera-gstreamer will attempt to find the first available +capture device, so if you happen to have to another one before the one created +by this module it might not work. You can bypass that, by just making a symlink +from /dev/videoXX to /dev/video0 to make first available capture device. |