demo工程暂存 优化菜单界面UI和功能

MCU/components/modules/lvgl/demos/README.md

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+# 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