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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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/*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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/*Flex layout demo*/
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#define LV_USE_DEMO_FLEX_LAYOUT 0
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/*Smart-phone like multi-language demo*/
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#define LV_USE_DEMO_MULTILANG 0
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/*Widget transformation demo*/
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#define LV_USE_DEMO_TRANSFORM 0
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/*Demonstrate scroll settings*/
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#define LV_USE_DEMO_SCROLL 0
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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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## Configure Demos Entry
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"demos/lv_demos.c" provides `lv_demos_create` and `lv_demos_usage` to simplify the creation of demos.
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If you build your main program named `lv_demos`, then you can run the widgets demo by running `lv_demos widgets` and the benchmark demo by running `lv_demos benchmark 1`.
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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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static lv_disp_t* hal_init(void)
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{
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lv_disp_t* disp = NULL;
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...
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/* TODO: init display and indev */
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...
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return disp;
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}
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int main(int argc, char ** argv)
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{
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lv_init();
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lv_disp_t* disp = hal_init();
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if (disp == NULL) {
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LV_LOG_ERROR("lv_demos initialization failure!");
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return 1;
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}
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if (!lv_demos_create(&argv[1], argc - 1)) {
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lv_demos_usage();
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goto demo_end;
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}
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while (1) {
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uint32_t delay = lv_timer_handler();
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if (delay < 1) delay = 1;
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usleep(delay * 1000);
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}
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demo_end:
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lv_deinit();
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return 0;
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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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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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### 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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### 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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### 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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## 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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