For the X windows interface on the ComfilePi, you can register a program to autostart by adding a command to start it in the /etc/xdg/lxsession/LXDE-pi/autostart file.
However, if a user has the file .config/lxsession/LXDE-pi/autostart in their home directory, the file in the /etc directory will be ignored and the command will need to be added to the user's autostart file instead.
For example, if you wanted to start a Mono program called HelloWorld.exe you would add the the line
@mono HelloWorld.exe to one of the autostart files mentioned above.
Most embedded applications do not run in a desktop environment. This procedure will describe how to configure the ComfilePi to boot to a console instead of a desktop environment, and auto-start a program as a service.
After rebooting, instead of booting to the desktop environment, it will boot to a console waiting for user to login.
/etc/systemd/system/. For this demonstration we will create a file named dashboard.service that will run the dashboard example program at
[Unit] Description=Dashboard example program [Service] ExecStart=/opt/Qt5.8/examples/quickcontrols/extras/dashboard/dashboard Restart=always [Install] WantedBy=multi-user.target
Description is just a textual description of the service.
ExecStart is the path to the executable to run.
Restart=always will cause the program to respawn if/when its exited.
WantedBy establishes where in the execution pipeline to this program should execute.
* See the systemd official documentation for more information.
sudo systemctl enable dashboard.service, and the next time the ComfilePi boots, it will run the dashboard program automatically. Execute
sudo systemctl start dashboard.serviceto run the service immediately.
sudo systemctl enable dashboard.service- Register the service. The program will auto-start on the next boot.
sudo systemctl disable dashboard.service- Unregister the service. The program will no longer auto-start.
sudo systemctl start dashboard.service- Start the program immediately.
sudo systemctl stop dashboard.service- Stop the program immediately. It will not automatically respawn after executing this command even with the
Qt programs running with the EGLFS backend need to declare a few environment variables to work properly. They are currently set in
/etc/profile.d/qt5.8-environment.sh, so if running the program under a user's profile, nothing needs to be done. However, systemd will not be running under a normal user's profile, so the environment variables must be set explicitly in the
.service file as illustrated below.
[Service] Environment="QT_QPA_EGLFS_HIDECURSOR=1" Environment="QT_QPA_EGLFS_DISABLE_INPUT=1" Environment="QT_QPA_GENERIC_PLUGINS=evdevmouse:abs" Environment="QT_QPA_EGLFS_PHYSICAL_WIDTH=154" Environment="QT_QPA_EGLFS_PHYSICAL_HEIGHT=86" Environment="QT_QPA_EGLFS_WIDTH=800" Environment="QT_QPA_EGLFS_HEIGHT=480" ExecStart=/opt/Qt5.8/examples/quickcontrols/extras/dashboard/dashboard