[lvgl (1)] a brief introduction to lvgl

Plan to learn LVGL, So record the learning process .

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LVGL The website links ：LVGL - Light and Versatile Embedded Graphics LibraryFree and open-source graphics library to create embedded GUI with easy-to-use graphical elements, beautiful visual effects and low memory footprint.https://lvgl.io/

LVGL Official website

Its code is placed in Github Upper

GitHub - lvgl/lvgl: Powerful and easy-to-use embedded GUI library with many widgets, advanced visual effects (opacity, antialiasing, animations) and low memory requirements (16K RAM, 64K Flash).https://github.com/lvgl/lvgl We should be good at making use of it Gitee Of “Github Speed up ” function ！

Gitee And review the code , So troublesome . It's better to just be Github Accelerator for .

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Github Warehouse

incredibly README And Chinese ！！ It's also very good for my English Xiaobai ！

What's the use of English ！ Official documents are not in Chinese , It's still hard ！！！

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LVGL A brief introduction to the conditions of

Official website · file · Forum · service · routine

requirement	Minimum requirements	It is suggested that
framework	16、32、64 Bit microcontroller or microprocessor
The clock	> 16 MHz	> 48 MHz
Flash/ROM	> 64 kB	> 180 kB
Static RAM	> 16 kB	> 48 kB
Draw buffer	> 1 × hor. res. pixels	> 1/10 The screen size
compiler	C99 Or update

Look at it this way , I want to use STM32C6T6 Your idea will come to naught ！！！！ So hard!

Think about it ESP32 learn LVGL Well ！STM32ZET6 Is that ok ？？

Look at the situation , Taoyi development board ！

LVGL It does not depend on a specific hardware platform , Any satisfaction LVGL All microcontrollers required by hardware configuration can run .

characteristic ：

• Rich and powerful modularity Graphic components ： Button (buttons)、 Chart (charts)、 list (lists)、 Slider bar (sliders)、 picture (images) etc.
• Advanced graphics engine ： Animation 、 Anti-Aliasing 、 transparency 、 Smooth scrolling 、 Layer blending and other effects
• Support for multiple input device ： Touch screen 、 keyboard 、 Encoder 、 Buttons, etc.
• Support Multi display device
• Independent of specific hardware platforms , It can run on any display
• Configuration can be cropped （ Minimum resource occupancy ：64 kB Flash,16 kB RAM）
• be based on UTF-8 Multilingual support for , For example, Chinese 、 Japanese 、 Korean 、 Arabic, etc
• Can pass class CSS The way to design 、 Layout graphical interface （ for example ：Flexbox、Grid）
• Support operating system 、 External memory 、 And hardware acceleration （LVGL Built in support STM32 DMA2D、SWM341 DMA2D、NXP PXP and VGLite）
• Even if only Single buffer (frame buffer) Under the circumstances , It can also ensure that the rendering is as smooth as silk
• All by C Finished writing , And support C++ call
• Support Micropython Programming , See ：LVGL API in Micropython
• Support Simulator Simulation , It can be developed without hardware support
• Rich and detailed routine
• Detailed file as well as API Reference manual , Available online or downloadable as PDF Format

How to get started ：

• Use Web page online routines To experience LVGL（3 minute ）
• Read the document brief introduction Chapter to get a preliminary understanding LVGL（5 minute ）
• Read the document again fast Quick overview Chapter to understand LVGL Basic knowledge of （15 minute ）
• Learn how to use Simulator To simulate on the computer LVGL（10 minute ）
• Try to practice some routine
• Reference resources Migration guide Try to LVGL Transplant to a development board ,LVGL Some transplanted ones have also been provided engineering
• Read the document carefully The overview Chapter to get more in-depth understanding and familiarity LVGL（2-3 Hours ）
• Browse documents Components (Widgets) Chapter to learn how to use them
• If you have any questions, you can go to LVGL Forum put questions to
• Read the document How to contribute to the community Chapter to see if you can help LVGL What does the community do , In order to promote LVGL The continuous improvement of software quality （15 minute ）

Is it that simple? ？？？ It's not easy to see ？？？ I don't believe it ！ impossible ！

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LVGL Simulator

LVGL And simulators , There is no need to consider the development board first ！！！

advantage ：

• Independent of hardware - Write code , stay PC Run on and on PC View the results on the display .
• Cross platform - whatever Windows、Linux or OSX PC Can run PC Simulator .
• Portability - The code is portable , This means that you can simply copy it when using embedded hardware .
• Easy verification - Simulators are also very useful for reporting errors , Because it means a common platform for every user . therefore , Reproduce the error in the simulator and use Forum  .

For installation, please see LVGL Let's have a look at your documents

STM32

I got confused by the official documents ？

There is nothing here .... How can I fix it ？？

ESP32

Anyway ESP32 use Arduino To use , Just look Arduino All right .

because v7.7.1 LVGL contain Kconfig file , therefore LVGL Can be used as ESP-IDF v4 Components .

Arduino

The core LVGL library and the examples are directly available as Arduino libraries.

LVGL Core libraries and examples can be used directly Arduino library .

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Pay attention to the version problem , Different versions are different ！！

In fact , The kernels of different platforms are the same , It should not be difficult to migrate from this platform to another platform ！

1️⃣LVGL Official documents ：LVGL Official documents

https://docs.lvgl.io/latest/en/html/index.html

2️⃣ On the spot atom LVGL course ： The punctual atoms LVGL course
 

http://www.openedv.com/docs/book-videos/zdyzshipin/4free/littleVGL.html

3️⃣ Litchi sect Nano Of LVGL course ： Litchi sect Nano Of LVGL course

http://nano.lichee.pro/application/littlevgl.html

4️⃣ Bison development board lvgl 6.0 routine ： Bison development board lvgl 6.0 routine

https://gitee.com/mzy2364/LittlevGL_Demo

5️⃣LVGL Official routine ：LVGL Official routine

https://github.com/lvgl/lv_demos

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Okay , This is my first acquaintance LVGL La ~

Subsequent updates ~