The Qt version of an embedded Linux system is tied to the Yocto version. Yocto 2.7 (Warrior) comes with Qt 5.12, Yocto 3.1 (Dunfell) with Qt 5.14, Yocto 3.2, 3.3 and 3.4 with Qt 5.15 . There is no Yocto version with Qt 6 yet. How can we build Qt 6.2 against the SDK of old Yocto versions?
Read More »Building Qt 6.2 For Old Yocto Versions
I never got the hang of UML: overly complicated, hard to understand, too close to code. Hence, I was skeptical about C4 diagrams when I… Read More »Visualising the Architecture of Qt Embedded Systems: Context and Container Diagrams
I am using TDD to implement a hardware-independent mock QCanBusDevice. We can use MockCanBusDevice in unit, integration and acceptance tests – without access to a… Read More »A Mock QCanBusDevice for TDD
Although Qt comes with a unit-test framework QuickTest for QML code, hardly any QML GUIs are unit-tested, let alone developed with TDD (test-driven development). One… Read More »Developing a QML Keypad with TDD
Creating an architecture means answering many questions about the ecosystem, in which the Qt embedded system operates. While the questions are very similar for all Qt embedded systems, the answers and their priorities differ. So, you should be able to transfer the questions and answers from my running example, a harvester terminal, to your system.
Read More »My Talk “A Successful Architecture for Qt Embedded Systems” at Qt Day Italy 2021
Our quest for a successful architecture of a harvester terminal continues. In this episode, we discuss when a system with a single application is good enough and when a system with multiple applications and a window manager is the better choice. Sometimes, a single-application system with a window manager is just the right choice.
Read More »Architecture of Qt Embedded Systems: Single vs. Multiple GUI ApplicationsNearly exactly 5 years ago, I wrote my first article about Using Qt 5.6 and Later under LGPL. The trigger then was the switch from LGPLv2.1 to LGPLv3 with Qt 5.6. The trigger now is the switch from Qt 5 to Qt 6. All the Qt modules under LGPLv3 5 years ago are still available under LGPLv3 – unless they have been retired. Some new modules like Charts, CoAP and MQTT were only available under Qt Commercial until Qt 5.15, but are now available under the new Marketplace license for 50-300 USD per year (no royalties). Some new modules like Quick 3D and WebAssembly are only commercially available. All in all not much changed: You can still build fantastic HMIs with Qt LGPLv3.
Read More »Using Qt 5.15 and Qt 6 under LGPLv3Setting up QtCreator for cross-compilation with CMake took me 15-20 hours the first two or three times. The next half a dozen times took me… Read More »How to Set Up QtCreator for Cross-Compilation with CMake in 5 Minutes
Our Qt embedded system is displayed on a monitor mounted in portrait orientation. The system runs the Wayland compositor Weston as a window manager. HMI applications are shown rotated by 90 degrees – in landscape orientation. The system toolbar of Weston is visible. How can we configure Weston so that the applications are shown in portrait orientation and so that the system toolbar is removed?
Read More »Showing Wayland Compositor Fullscreen in Portrait Orientation