LittlevGL - Free Open-source Embedded GUI Library

LittlevGL provides everything you need to create a Graphical User Interface (GUI) on embedded systems with easy-to-use graphical elements, beautiful visual effects and low memory footprint.

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Website · Live demo · Simulator · Docs · Blog

Features

Powerful building blocks buttons, charts, lists, sliders, images, etc.
Advanced graphics with animations, anti-aliasing, opacity, smooth scrolling
Various input devices touch pad, mouse, keyboard, encoder, buttons, etc.
Multi-language support with UTF-8 encoding
Fully customizable graphical elements
Hardware independent to use with any microcontroller or display
Scalable to operate with little memory (50 kB Flash, 10 kB RAM)
OS, External memory and GPU supported but not required
Single frame buffer operation even with advances graphical effects
Written in C for maximal compatibility
Simulator to develop on PC without embedded hardware
Tutorials, examples, themes for rapid development
Documentation and API references online

Supported devices

Basically, every modern controller - which is able to drive a display - is suitable to run LittlevGL. The minimal requirements:

16, 32 or 64-bit microcontroller or processor
> 16 MHz clock speed
> 8 kB RAM for static data and > 2 KB RAM for dynamic data (graphical objects)
> 64 kB flash program memory
Optionally ~1/10 screen sized memory for buffered drawing (on 240 × 320, 16-bit colors it's 15 kB)

Just to mention some platforms:

STM32F1, STM32F3, STM32F4, STM32F7
Microchip dsPIC33, PIC24, PIC32MX, PIC32MZ
NXP Kinetis, LPC, iMX
Linux frame buffer (/dev/fb)
Raspberry PI
Espressif ESP32
Nordic nrf52
Quectell M66

Quick start in a simulator

Try LittlevGL in a simulator on you PC without any embedded hardware. Choose a project with your favourite IDE:

Eclipse	CodeBlock	Visual Studio	PlatfomIO	Qt Creator

Cross-platform with SDL	Native Windows	Cross-platform with SDL	Cross-platform with SDL	Cross-platform with SDL

Porting to an embedded hardware

In the most simple case you need to do 5 things:

Call lv_tick_inc(x) every x milliseconds in a Timer or Task (x should be between 1 and 10)
Register a function which can copy a pixel array to an area of the screen.
Register a function which can read an input device. (E.g. touch pad)
Copy lv_conf_templ.h as lv_conf.h next to lvgl and set at least LV_HOR_RES, LV_VER_RES and LV_COLOR_DEPTH.
Call lv_task_handler() periodically every few milliseconds.

For a detailed description check the Online documatation or the Porting tutorial

Contributing

To ask questions and discuss topics we use GitHub's Issue tracker. You contribute in several ways:

Answer other's question click the Watch button on the top to get notified about the issues
Report and/or fix bugs using the issue tracker and in Pull-request
Suggest and/or implement new features using the issue tracker and in Pull-request
Improve and/or translate the documentation learn more here
Write a blog post about your experiences learn more here
Upload your project or product as a reference to this site

Before contributing, please read CONTRIBUTING.md.
For more info read this blog post.

Donate

If you are pleased with the library, found it useful, or you are happy with the support you got, please help its further development:

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