Graphics library to create embedded GUI with easy-to-use graphical elements, beautiful visual effects and low memory footprint. Anti-aliasing, opacity, animations using only one frame buffer.
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README.md

Littlev Graphics Library

LittlevGL cover

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.
https://littlevgl.com

Key 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

Porting

In the simplest case you need 5 things:

  1. Call lv_tick_inc(x) every x milliseconds in a Timer or Task (x should be between 1 and 10)
  2. Register a function which can copy a pixel array to an area of the screen.
  3. Register a function which can read an input device. (E.g. touch pad)
  4. Copy lv_conf_templ.h as lv_conf.h and set at least LV_HOR_RES, LV_VER_RES and LV_COLOR_DEPTH.
  5. Call lv_task_handler() periodically every few milliseconds. For a detailed description visit https://littlevgl.com/porting Or check the Porting tutorial

Project set-up

  1. Clone or Download the lvgl repository: git clone https://github.com/littlevgl/lvgl.git
  2. Create project with your preferred IDE and add the lvgl folder
  3. Copy lvgl/lv_conf_templ.h as lv_conf.h next to the lvgl folder
  4. In the lv_conf.h delete the first #if 0 and its #endif. Leave the default configuration for the first try.
  5. In your main.c: #include "lvgl/lvgl.h"
  6. In your main function:
    • lvgl_init();
    • tick, display and input device initialization (see above)
  7. To test create a label: lv_obj_t * label = lv_label_create(lv_scr_act(), NULL);
  8. In the main while(1) call lv_task_handler(); and make a few milliseconds delay (e.g. my_delay_ms(5);)
  9. Compile the code and load it to your embedded hardware

PC Simulator

You can test the graphics library in a PC simulator, if you don't have an embedded hardware. The simulator uses SDL2 library to emulate a display on your monitor and a touch pad with your mouse.

There is a pre-configured PC project for Eclipse CDT in this repository: https://github.com/littlevgl/pc_simulator

Related repositories

Screenshots

TFT material TFT zen TFT alien TFT night

Contributing

See CONTRIBUTING.md

Donate

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

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