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# Demos for LVGL
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## Add the examples to your projects
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1. demos can be found in the 'demos' folder once you clone the lvgl.
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2. In the ***lv_conf.h*** or equivalent places, you can find demo related macros, change its value to enable or disable specified demos:
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```c
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...
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/*===================
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* DEMO USAGE
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====================*/
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/*Show some widget. It might be required to increase `LV_MEM_SIZE` */
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#define LV_USE_DEMO_WIDGETS 0
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#if LV_USE_DEMO_WIDGETS
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#define LV_DEMO_WIDGETS_SLIDESHOW 0
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#endif
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/*Demonstrate the usage of encoder and keyboard*/
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#define LV_USE_DEMO_KEYPAD_AND_ENCODER 0
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/*Benchmark your system*/
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#define LV_USE_DEMO_BENCHMARK 0
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/*Stress test for LVGL*/
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#define LV_USE_DEMO_STRESS 0
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/*Music player demo*/
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#define LV_USE_DEMO_MUSIC 0
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#if LV_USE_DEMO_MUSIC
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# define LV_DEMO_MUSIC_SQUARE 0
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# define LV_DEMO_MUSIC_LANDSCAPE 0
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# define LV_DEMO_MUSIC_ROUND 0
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# define LV_DEMO_MUSIC_LARGE 0
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# define LV_DEMO_MUSIC_AUTO_PLAY 0
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#endif
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...
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```
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3. If your development environment or toolchain does not add source files inside '***lvgl***' folder automatically, ensure the `demos` folder is included for compilation.
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4. Include "***demos/lv_demos.h***" in your application source file, for example:
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```c
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//! main.c
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#include "lvgl.h"
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#include "demos/lv_demos.h"
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...
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```
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## Demos
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### Widgets
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Shows how the widgets look like out of the box using the built-in material theme.
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See in [widgets](https://github.com/lvgl/lvgl/tree/master/demos/widgets) folder.
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<img src="https://github.com/lvgl/lvgl/tree/master/demos/widgets/screenshot1.png?raw=true" width=600px alt="Basic demo to show the widgets of LVGL">
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For running this demo properly, please make sure **LV_MEM_SIZE** is at least **38KB** (and **48KB** is recommended):
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```c
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#define LV_MEME_SIZE (38ul * 1024ul)
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```
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### Music player
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The music player demo shows what kind of modern, smartphone-like user interfaces can be created on LVGL. It works the best with display with 480x272 or 272x480 resolution.
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See in [music](https://github.com/lvgl/lvgl/tree/master/demos/music) folder.
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<img src="https://github.com/lvgl/lvgl/tree/master/demos/music/screenshot1.gif?raw=true" width=600px alt="Music player demo with LVGL">
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### Keypad and encoder
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LVGL allows you to control the widgets with a keypad and/or encoder without a touchpad. This demo shows how to handle buttons, drop-down lists, rollers, sliders, switches, and text inputs without touchpad.
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Learn more about the touchpad-less usage of LVGL [here](https://docs.lvgl.io/master/overview/indev.html#keypad-and-encoder).
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See in [keypad_encoder](https://github.com/lvgl/lvgl/tree/master/demos/keypad_encoder) folder.
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<img src="https://github.com/lvgl/lvgl/tree/master/demos/keypad_encoder/screenshot1.png?raw=true" width=600px alt="Keypad and encoder navigation in LVGL embedded GUI library">
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### Benchmark
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A demo to measure the performance of LVGL or to compare different settings.
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See in [benchmark](https://github.com/lvgl/lvgl/tree/master/demos/benchmark) folder.
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<img src="https://github.com/lvgl/lvgl/tree/master/demos/benchmark/screenshot1.png?raw=true" width=600px alt="Benchmark demo with LVGL embedded GUI library">
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### Stress
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A stress test for LVGL. It contains a lot of object creation, deletion, animations, style usage, and so on. It can be used if there is any memory corruption during heavy usage or any memory leaks.
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See in [stress](https://github.com/lvgl/lvgl/tree/master/demos/stress) folder.
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<img src="https://github.com/lvgl/lvgl/tree/master/demos/stress/screenshot1.png?raw=true" width=600px alt="Stress test for LVGL">
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## Contributing
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For contribution and coding style guidelines, please refer to the file docs/CONTRIBUTING.md in the main LVGL repo:
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https://github.com/lvgl/lvgl
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