lvgl/demos/README.md

# Demos for LVGL

## Add the examples to your projects
1. demos can be found in the 'demos' folder once you clone the lvgl.

2. In the ***lv_conf.h*** or equivalent places, you can find demo related macros, change its value to enable or disable specified demos:

```c
...
/*===================
 * DEMO USAGE
 ====================*/

/*Show some widget. It might be required to increase `LV_MEM_SIZE` */
#define LV_USE_DEMO_WIDGETS        0
#if LV_USE_DEMO_WIDGETS
#define LV_DEMO_WIDGETS_SLIDESHOW  0
#endif

/*Demonstrate the usage of encoder and keyboard*/
#define LV_USE_DEMO_KEYPAD_AND_ENCODER     0

/*Benchmark your system*/
#define LV_USE_DEMO_BENCHMARK   0

/*Stress test for LVGL*/
#define LV_USE_DEMO_STRESS      0

/*Music player demo*/
#define LV_USE_DEMO_MUSIC       0
#if LV_USE_DEMO_MUSIC
# define LV_DEMO_MUSIC_SQUARE       0
# define LV_DEMO_MUSIC_LANDSCAPE    0
# define LV_DEMO_MUSIC_ROUND        0
# define LV_DEMO_MUSIC_LARGE        0
# define LV_DEMO_MUSIC_AUTO_PLAY    0
#endif
...
```

3. If your development environment or toolchain does not add source files inside '***lvgl***' folder automatically, ensure the `demos` folder is included for compilation.
4. Include "***demos/lv_demos.h***" in your application source file, for example:

```c
//! main.c
#include "lvgl.h"
#include "demos/lv_demos.h"
...
```



## Demos

### Widgets
Shows how the widgets look like out of the box using the built-in material theme.

See in [widgets](https://github.com/lvgl/lvgl/tree/master/demos/widgets) folder.

<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">

For running this demo properly, please make sure **LV_MEM_SIZE** is at least **38KB** (and **48KB** is recommended):

```c
#define LV_MEME_SIZE    (38ul * 1024ul)
```



### Music player
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.

See in [music](https://github.com/lvgl/lvgl/tree/master/demos/music) folder.

<img src="https://github.com/lvgl/lvgl/tree/master/demos/music/screenshot1.gif?raw=true" width=600px alt="Music player demo with LVGL">

### Keypad and encoder
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.
Learn more about the touchpad-less usage of LVGL [here](https://docs.lvgl.io/master/overview/indev.html#keypad-and-encoder).

See in [keypad_encoder](https://github.com/lvgl/lvgl/tree/master/demos/keypad_encoder) folder.

<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">

### Benchmark
A demo to measure the performance of LVGL or to compare different settings.
See in [benchmark](https://github.com/lvgl/lvgl/tree/master/demos/benchmark) folder.
<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">

### Stress
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.
See in [stress](https://github.com/lvgl/lvgl/tree/master/demos/stress) folder.
<img src="https://github.com/lvgl/lvgl/tree/master/demos/stress/screenshot1.png?raw=true" width=600px alt="Stress test for LVGL">

## Contributing
For contribution and coding style guidelines, please refer to the file docs/CONTRIBUTING.md in the main LVGL repo:
  https://github.com/lvgl/lvgl