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Qt for MCUs 2.2LTS新技术与生态合作

优飞迪科技

2年前浏览1806

回顾历史版本

Since 1.0

26 new major features

9 new reference MCUs

1 new reference target OS

1 new compiler support

1 new host platform

163 bug fixes

Qt for MCUs 2.2LTS长周期支持

› Qt for MCUs 2.2 is the first LTS release

› QML APIs aligned and compatible with Qt 6.2 LTS

› 1 patch release every 6-8 weeks for 18 months, starting August 2022

支持的MCU平台

Qt for MCUs 2.2LTS新技术

文字处理

Qt for MCUs处理文字

-支持Glyph位图字体

• 编译时TTF自动转换为位图

• 极低的CPU占用

-支持Monotype Spark™字体引擎

• 专门为MCU环境设计

• 低CPU和内存占用

• 高性能矢量字体运行时绘制引擎

• 提供字体编辑工具

Monotype Spark Font Engine (TP)

国际化语言显示文本

文本溢出处理

› What is it and why is it important?

Display dynamic text and translations that are too long to fit in limited screen space. Must-have for dynamic UIs.

› What’s new?

QML property: Text.elide

Enum values: Text.ElideNone (default), Text.ElideLeft, Text.ElideMiddle, Text.ElideRight

› What should I know?

-Behavior aligned with Qt

-Text width (or right and left anchors) must be set

-Works with multiline text if Text has an explicit height

› Learn more

https://doc-snapshots.qt.io/qtformcus-dev/qml-qtquick-text.html#elide-prop

文本自动变形

› What is it and why is it important?

Automatically wrap text when it’s wider than the available space. Must-have for dynamic UIs and multi-language applications.

› What’s new?

QML property: Text.wrapMode

Enum values: Text.NoWrap(default), Text.WordWrap, Text.WrapAnywhere, Text.Wrap

› What should I know?

-Behavior aligned with Qt

-Text width (or right and left anchors) must be set.

-Not available for StaticText

› Learn more

https://doc-snapshots.qt.io/qtformcus-dev/qml-qtquick-text.html#wrapMode-prop

图片优化及资源管理

Qt for MCUs处理图片

-未压缩的RGB格式速度很快，但闪存成本非常高。

-PNG格式高压缩率闪存占用空间低，但需要更多的RAM来保存解压缩的数据。

-RLE压缩，轻量级，低闪存和低RAM，并且提供足够快的解压缩时间。

RLE压缩

OPTIMAL USE OF HARDWARE：Improved management of graphical resources

› Why is this valuable?

Achieve UX goals while keeping hardware costs to a minimum

› What’s new?

-New CMake APIs for graphical resource configuration

-Fine-grained placement of individual resources

› Why is it important?

Reaching the desired frame rate and fitting the GUI in memory often requires an optimized placement of resources

› Learn more

https://doc-snapshots.qt.io/qtformcus-dev/qtul-resources.html#resource-placement-in-memory

OTA GUI UPDATES：Replaceable resources in deployed applications

› Why is this valuable?

-Cheaper device firmware update process for specific use cases

-Full software recertification is not needed

› What are the use cases?

-GUI style update

-Device (re-)branding

-Downloadable GUI skins

› What’s new?

-Image resources can be replaced without re-flashing the complete application

-CMake build target to compile resource binaries

› Learn more

https://doc-snapshots.qt.io/qtformcus-dev/qtul-resources.html#ota-resources-update

新的错误处理机制

错误处理

› What is it and why is it important?

APIs to be notified of errors in GUI code and react appropriately. Enables robust and traceable applications.

› What are the use cases?

Some examples:

-detailed logging for debugging or device diagnostic

-restart the device on memory allocation failure in QUL

› What’s new?

C++ API: Qul::setErrorHandler(), QUL_ASSERT()

Enum: QulError

› What should I know?

-The default error handler prints an error message in the console.

-Custom handlers can be implemented for custom logging or mitigation actions.

› Learn more

https://doc-snapshots.qt.io/qtformcus-dev/qtul-error-handling.html

代码生成工具qmlprojectexporter

技术预览: qmlprojectexporter

› What is it and why is it important?

New ways to generate C++ code from a QML project, enabling new and better workflows. Possibility to build QUL applications in any IDE or build system.

› What’s new?

New project file format: .qmlproject

New command-line tools: qmlprojectexporter, platform exporter

› What should I know?

-Optional feature, users can still use the old way of building QUL applications for compatibility reasons

-Available as Tech Preview, APIs can change in v2.3

› Learn more

https://doc-snapshots.qt.io/qtformcus-dev/qtul-qmlproject-qmlprojectexporter.html

https://doc-snapshots.qt.io/qtformcus-dev/qtul-qmlproject-qmlprojectexportercmd-qmlprojectfile.html

https://doc-snapshots.qt.io/qtformcus-dev/qtul-platform-exporter.html

构建APP静态库

Static Library Build

Example:https://doc-snapshots.qt.io/qtformcus/quickultralite-static-library-example.html

性能优化指南

Performance and footprint guide

-Achieving good performance with a low memory footprint is challenging

-New documentation with guidelines, tips, and tricks to help get the best results faster

-Instructions on how to collect performance data from the device

› Learn more

https://doc.qt.io/QtForMCUs-2.2/qtul-performance-guide.html

https://doc.qt.io/QtForMCUs-2.2/qtul-performance-logging.html

生态合作

Qt for MCUs on 杰发 ac8015：透明alpha图片显示

Qt完成芯驰最新车规级芯片适配，助力车载HMI创新加速

Qt for MCUs on SemiDrive – E3

Qt for MCUs on 乐鑫 Espressif ESp32-S3-BOX

Qt for MCUs on OneOS 国产思澈芯片

中国移动OneOS是为物联网行业打造的可裁剪、跨平台、低功耗、轻量级实时操作系统。中移物联与Qt共同推出了Qt for MCUs-OneOS，通过OneOS的芯片适配能力，针对硬件底层进行GUI适配，可广泛应用于表计、穿戴、家居、工业控制等行业。

“Qt for MCUs-OneOS拥有极致性能，让我们可以快速开发、上线新应用，大大提升了生产效率。中国移动作为一家全球领先的通信运营商，拥有大量中小型企业客户，”OneOS产品总监孙靖评价，“我们与Qt合作，一方面提升了OneOS的GUI组件平台能力，同时也让更多企业用户获得了Qt的商业软件价值，希望未来有更多的用户能和我们一起来共建国产物联网操作系统的生态圈。”