We want to develop the Internet radio application for the Raspberry Pi in the same way as for a PC. We change the source code in QtCreator and run the application. QtCreator cross-builds the application on the PC for the Raspberry Pi, deploys it with SSH to the Pi and runs it on the Pi....
Category: Embedded Linux
Qt Embedded Systems – Part 1: Building a Linux Image with Yocto
In Part 1 of the series on Qt Embedded Systems, we build a custom Linux image with Yocto for the Raspberry Pi 3B. When we power on the embedded device, it starts an Internet radio application – called Cuteradio. This QML application is very simple: it can only play a single, hard-wired station. Despite its...
Less Love for FOSS Qt Users
From Qt 5.15, The Qt Company make their offering a bit more inconvenient for FOSS users. They announced three changes: A Qt account is mandatory to download binary Qt packages. The offline installer is not available to FOSS users any more. LTS (long-term support) releases are not available to FOSS users, once the next minor...
Detecting Overdraw in QML HMIs with GammaRay
Overdraw happens when one QML item fully eclipses another QML item. The QML renderer always draws both items, although there is no need to draw the eclipsed item. You must help out the renderer by explicitly setting visible: false on the eclipsed item. On embedded systems, heavy overdraw makes animations or flicking jerky. In the...
My talk “A Deep Dive into QtCanBus” at Qt World Summit 2019
The screenshot above shows the home screen of a sugar beet harvester. The home screen receives roughly 50 CAN messages per second and displays the contents of the CAN messages numerically or graphically.
Deploying Qt Projects to Embedded Devices with CMake
When you run a Qt project, QtCreator first deploys the project to a remote embedded Linux device via ssh and then runs the executable on the remote device. This feature enables nearly instant feedback how your Qt application works on the embedded device. Deployment works fine with the INSTALLS variable of qmake. It does not...
Yocto Builds with CROPS Containers
In a recent post Using Docker Containers for Yocto Builds, I suffered an episode of NIHS (not-invented-here syndrome). I wrote a Dockerfile for Yocto builds. Stefan Agner pointed out in his comment that the CROPS project provides ready-made containers for Linux distributions like Ubuntu, Fedora and others. The crops/poky-container enables us to start our first...
Using Docker Containers for Yocto Builds
We want to build a custom Linux image with Yocto for the Raspberry Pi 3 model B (BCM2837). The Linux image contains a very simple Internet radio application using Qt 5.11 and the eglfs graphics backend. Our colleagues shall be able to repeat the build easily – now, in three years and even in ten...
Linux Foundation Launches Automated Compliance Tooling (ACT) Project
LinuxGizmos reports that the Linux Foundation has launched a project Automated Compliance Tooling (ACT). ACT is an umbrella project for FOSS compliance tools like Fossology, Quartermaster and SPDX. Fossology is a copyright and license scanner that works on the source code (see my recent post Seminar “Open-Source Management in Software Supply Chains” for a very...
Seminar “Open-Source Management in Software Supply Chains”
On 20 November 2018, the law firm Bird & Bird hosted a seminar about “Open-Source Management in Software Supply Chains – Effective and Consistent License Compliance” in their Frankfurt office. The seminar was organised by Miriam Ballhausen, who is Bird & Bird’s specialist in open-source Licensing. The seminar offered the opportunity to meet two of...