QtDesignStudio/FAQ

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This page contains technical FAQs for Design Studio, its MCU support as well as Figma integration.

Design Studio & MCU

What are the main differences between Qt Quick and Qt Ultralite?

There are several differences due to optimizations required by the embedded world. These include:

• Some QML types are unavailable in Qt Ultralite. The available types are listed here.
• Some of the types have additional constraints what is described here.
• The QML/JS support is limited for MCU to the features described here.

For full overview of the differences please refer to QtForMCUs docs.

I'm starting a project for MCU, what should I remember at the very beginning?

You can start immediately and create a new project using the Qt for MCUs presets.

The components and their properties available in the Design Studio editor should respect the MCU rules. However, if you plan to edit the QML code manually, you may end up creating code that is not valid for the MCU and you won't notice it at first glance.

In this case it is worth configuring 'Qt for MCUs SDK' in 'Preferences->Devices->MCU'. The kit can be obtained from the Qt Maintenance Tool (an appropriate license is required). All you need to do is set the appropriate SDK installation path and reopen/create your project. With the MCUs SDK configured, Design Studio will automatically add an additional deployment step to your project that generates MCU-compliant C++ code. If something goes wrong during this process, such as using properties that are not available in Qt for MCU, you will see an error in the console.

For example, the following code for the Rectangle is perfectly fine, you can paste it into your MCU project in the Design Studio and run it:

Rectangle { 
    width: 200 
    height: 200 
    visible: true 
    anchors.centerIn: parent 
    color: "red" 
    rotation: 45 
    border.width: 10 
    border.color: "green"  
}

However, a Rectangle type for MCU does not have border and rotation properties. If you configure the MCU SDK kit, you will see errors in the console and Design Studio won't be able to run the project/generate a preview:

/SomePath/SomeProject/Screen01.ui.qml:24:9: error: Group property of unknown type border.width: 10 /SomePath/SomeProject//Screen01.ui.qml:23:9: error: Binding on property of unknown type rotation: 45

Design Studio import of data from Qt Bridge for Figma

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