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README.md
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README.md
@ -1,4 +1,4 @@
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<h1 align="center"> LittlevGL - Open-source Embedded GUI Library</h1>
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<h1 align="center"> LVGL - Little and Versatile Graphics Library</h1>
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<p align="center">
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<a href="https://github.com/littlevgl/lvgl/blob/master/LICENCE.txt"><img src="https://img.shields.io/badge/licence-MIT-blue.svg"></a>
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<a href="https://github.com/littlevgl/lvgl/releases/tag/v6.1.2"><img src="https://img.shields.io/badge/version-6.1.2-blue.svg"></a>
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@ -9,16 +9,16 @@
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</p>
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<p align="center">
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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.
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LVGL provides everything you need to create embedded GUI with easy-to-use graphical elements, beautiful visual effects and low memory footprint.
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</p>
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<h4 align="center">
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<a href="https://littlevgl.com">Website </a> ·
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<a href="https://littlevgl.com/live-demo">Live demo</a> ·
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<a href="https://docs.littlevgl.com/en/html/get-started/pc-simulator.html">Simulator</a> ·
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<a href="https://forum.littlevgl.com">Forum</a> ·
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<a href="https://docs.littlevgl.com/">Docs</a> ·
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<a href="https://blog.littlevgl.com/">Blog</a>
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<a href="https://lvgl.io">Website </a> ·
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<a href="https://lvgl.io/demos">Live demo</a> ·
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<a href="https://docs.littlevgl.com/v7/en/html/get-started/pc-simulator.html">Simulator</a> ·
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<a href="https://forum.lvgl.io">Forum</a> ·
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<a href="https://docs.lvgl.io/">Docs</a> ·
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<a href="https://blog.lvgl.io/">Blog</a>
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</h4>
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---
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@ -30,7 +30,6 @@ LittlevGL provides everything you need to create a Graphical User Interface (GUI
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- [Learn the basics](#learn-the-basics)
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- [Examples](#examples)
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- [Contributing](#contributing)
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- [Donate](#donate)
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## Features
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@ -44,8 +43,8 @@ LittlevGL provides everything you need to create a Graphical User Interface (GUI
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* **Scalable** to operate with little memory (64 kB Flash, 10 kB RAM)
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* **OS, External memory and GPU** supported but not required
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* **Single frame buffer** operation even with advances graphical effects
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* **Written in C** for maximal compatibility
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* **Micropython Binding** exposes [LittlevGL API in Micropython](https://blog.littlevgl.com/2019-02-20/micropython-bindings)
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* **Written in C** for maximal compatibility (C++ compatible)
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* **Micropython Binding** exposes [LVGL API in Micropython](https://blog.lvgl.io/2019-02-20/micropython-bindings)
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* **Simulator** to develop on PC without embedded hardware
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* **Tutorials, examples, themes** for rapid development
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* **Documentation** and API references
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@ -66,12 +65,12 @@ Basically, every modern controller - which is able to drive a display - is suita
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*Note that the memory usage might vary depending on the architecture, compiler and build options.*
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Just to mention some **platforms**:
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- STM32F1, STM32F3, [STM32F4](https://blog.littlevgl.com/2017-07-15/stm32f429_disco_port), [STM32F7](https://github.com/littlevgl/stm32f746_disco_no_os_sw4stm32)
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- STM32F1, STM32F3, [STM32F4](https://blog.lvgl.io/2017-07-15/stm32f429_disco_port), [STM32F7](https://github.com/littlevgl/stm32f746_disco_no_os_sw4stm32)
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- Microchip dsPIC33, PIC24, PIC32MX, PIC32MZ
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- NXP Kinetis, LPC, iMX
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- [Linux frame buffer](https://blog.littlevgl.com/2018-01-03/linux_fb) (/dev/fb)
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- [Linux frame buffer](https://blog.lvgl.io/2018-01-03/linux_fb) (/dev/fb)
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- [Raspberry PI](http://www.vk3erw.com/index.php/16-software/63-raspberry-pi-official-7-touchscreen-and-littlevgl)
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- [Espressif ESP32](https://github.com/littlevgl/lv_port_esp32)
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- [Espressif ESP32](https://github.com/lvgl/lv_port_esp32)
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- Nordic nrf52
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- Quectell M66
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@ -82,22 +81,22 @@ Choose a project with your favourite IDE:
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| Eclipse | CodeBlocks | Visual Studio | PlatformIO | Qt Creator |
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|-------------|-------------|---------------|-----------|------------|
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| [](https://github.com/littlevgl/pc_simulator_sdl_eclipse) | [](https://github.com/littlevgl/pc_simulator_win_codeblocks) | [](https://github.com/littlevgl/visual_studio_2017_sdl_x64) | [](https://github.com/littlevgl/pc_simulator_sdl_platformio) | [](https://blog.littlevgl.com/2019-01-03/qt-creator) |
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| [](https://github.com/lvgl/pc_simulator_sdl_eclipse) | [](https://github.com/lvgl/pc_simulator_win_codeblocks) | [](https://github.com/lvgl/visual_studio_2017_sdl_x64) | [](https://github.com/lvgl/pc_simulator_sdl_platformio) | [](https://blog.lvgl.io/2019-01-03/qt-creator) |
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| Cross-platform<br>with SDL<br>(Recommended on<br>Linux and Mac) | Native Windows | Windows<br>with SDL | Cross-platform<br>with SDL | Cross-platform<br>with SDL |
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## Add LittlevGL to your project
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The steps below show how to setup LittlevGL on an embedded system with a display and a touchpad.
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You can use the [Simulators](https://docs.littlevgl.com/en/html/get-started/pc-simulator) to get ready to use projects which can be run on your PC.
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The steps below show how to setup LVGL on an embedded system with a display and a touchpad.
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You can use the [Simulators](https://docs.lvgl.io/v7/en/html/get-started/pc-simulator) to get ready to use projects which can be run on your PC.
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1. [Download](https://littlevgl.com/download) or [Clone](https://github.com/littlevgl/lvgl) the library
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1. [Download](https://lvgl.com/developers) or [Clone](https://github.com/lvgl/lvgl) the library
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2. Copy the `lvgl` folder into your project
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3. Copy `lvgl/lv_conf_template.h` as `lv_conf.h` next to the `lvgl` folder and set at least `LV_HOR_RES_MAX`, `LV_VER_RES_MAX` and `LV_COLOR_DEPTH`. Don't forget to **change the `#if 0` statement near the top of the file to `#if 1`**, otherwise you will get compilation errors.
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4. Include `lvgl/lvgl.h` where you need to use LittlevGL related functions.
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5. Call `lv_tick_inc(x)` every `x` milliseconds **in a Timer or Task** (`x` should be between 1 and 10). It is required for the internal timing of LittlevGL.
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4. Include `lvgl/lvgl.h` where you need to use LVGL related functions.
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5. Call `lv_tick_inc(x)` every `x` milliseconds **in a Timer or Task** (`x` should be between 1 and 10). It is required for the internal timing of LVGL.
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6. Call `lv_init()`
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7. Create a display buffer for LittlevGL
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7. Create a display buffer for LVGL
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```c
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static lv_disp_buf_t disp_buf;
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static lv_color_t buf[LV_HOR_RES_MAX * 10]; /*Declare a buffer for 10 lines*/
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@ -154,16 +153,19 @@ It will redraw the screen if required, handle input devices etc.
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## Learn the basics
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### Objects (Widgets)
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In this section you can ready the very basics. For a more detailed guide check the [Quick overview]
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(https://docs.littlevgl.com/v7/en/html/get-started/quick-overview.html#learn-the-basics) in the documentation.
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The graphical elements like Buttons, Labels, Sliders, Charts etc are called objects in LittelvGL. Go to [Object types](https://docs.littlevgl.com/en/html/object-types/index) to see the full list of available types.
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### Widgets (Objects)
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The graphical elements like Buttons, Labels, Sliders, Charts etc are called objects in LittelvGL. Go to [Object types](https://docs.littlevgl.com/v7/en/html/widgets/index) to see the full list of available types.
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Every object has a parent object. The child object moves with the parent and if you delete the parent the children will be deleted too. Children can be visible only on their parent.
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The *screen* are the "root" parents. To get the current screen call `lv_scr_act()`.
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You can create a new object with `lv_<type>_create(parent, obj_to_copy)`. It will return an `lv_obj_t *` variable which should be used as a reference to the object to set its parameters.
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The first parameter is the desired *parent*, te second parameters can be an object to copy (`NULL` is unused).
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The first parameter is the desired *parent*, the second parameters can be an object to copy (`NULL` if unused).
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For example:
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```c
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lv_obj_t * slider1 = lv_slider_create(lv_scr_act(), NULL);
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@ -184,30 +186,27 @@ lv_slider_set_value(slider1, 70, LV_ANIM_ON);
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To see the full API visit the documentation of the object types or the related header file (e.g. `lvgl/src/lv_objx/lv_slider.h`).
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### Styles
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Styles can be assigned to the objects to changed their appearance. A style describes the appearance of rectangle-like objects (like a button or slider), texts, images and lines at once.
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You can create a new style like this:
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Widgets are created with a default appearance but it can be changed by adding new styles to the object. A new style can be created like this:
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```c
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static lv_style_t style1; /*Declare a new style. Should be `static`*/
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lv_style_copy(&style1, &lv_style_plain); /*Copy a built-in style*/
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style1.body.main_color = LV_COLOR_RED; /*Main color*/
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style1.body.grad_color = lv_color_hex(0xffd83c) /*Gradient color (orange)*/
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style1.body.radius = 3;
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style1.text.color = lv_color_hex3(0x0F0) /*Label color (green)*/
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style1.text.font = &lv_font_dejavu_22; /*Change font*/
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...
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static lv_style_t style1; /*Should be static, global or dynamically allocated*/
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lv_style_init(&style1);
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lv_style_set_bg_color(&style1, LV_STATE_DEFAULT, LV_COLOR_RED); /*Default background color*/
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lv_style_set_bg_color(&style1, LV_STATE_PRESSED, LV_COLOR_BLUE); /*Pressed background color*/
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```
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To set a new style for an object use the `lv_<type>set_style(obj, LV_<TYPE>_STYLE_<NAME>, &my_style)` functions. For example:
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```c
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lv_slider_set_style(slider1, LV_SLIDER_STYLE_BG, &slider_bg_style);
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lv_slider_set_style(slider1, LV_SLIDER_STYLE_INDIC, &slider_indic_style);
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lv_slider_set_style(slider1, LV_SLIDER_STYLE_KNOB, &slider_knob_style);
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The wigedt have *parts* which can be referenced via `LV_<TYPE>_PART_<PART_NAME>`. E.g. `LV_BRN_PART_MAIN` or `LV_SLIDER_PART_KNOB`. See the documentation of the widgets to see the exisitng parts.
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To add the style to a button:
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```
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lv_obj_add_style(btn1, LV_BTN_PART_MAIN, &style1);
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```
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If an object's style is `NULL` then it will inherit its parent's style. For example, the labels' style are `NULL` by default. If you place them on a button then they will use the `style.text` properties from the button's style.
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To remove all styles from an object use:
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```c
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lv_obj_reset_style_list(obj, LV_OBJ_PART_MAIN);
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```
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Learn more in [Style overview](https://docs.littlevgl.com/en/html/overview/style) section.
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Learn more in [Style overview](https://docs.lvgl.io/v7/en/html/overview/style) section.
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### Events
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Events are used to inform the user if something has happened with an object. You can assign a callback to an object which will be called if the object is clicked, released, dragged, being deleted etc. It should look like this:
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@ -249,121 +248,10 @@ void btn_event_cb(lv_obj_t * btn, lv_event_t event)
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}
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}
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```
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### Button with styles
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Add styles to the previously button from the previous example
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```c
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static lv_style_t style_btn_rel; /*A variable to store the released style*/
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lv_style_copy(&style_btn_rel, &lv_style_plain); /*Initialize from a built-in style*/
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style_btn_rel.body.border.color = lv_color_hex3(0x269);
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style_btn_rel.body.border.width = 1;
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style_btn_rel.body.main_color = lv_color_hex3(0xADF);
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style_btn_rel.body.grad_color = lv_color_hex3(0x46B);
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style_btn_rel.body.shadow.width = 4;
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style_btn_rel.body.shadow.type = LV_SHADOW_BOTTOM;
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style_btn_rel.body.radius = LV_RADIUS_CIRCLE;
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style_btn_rel.text.color = lv_color_hex3(0xDEF);
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static lv_style_t style_btn_pr; /*A variable to store the pressed style*/
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lv_style_copy(&style_btn_pr, &style_btn_rel); /*Initialize from the released style*/
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style_btn_pr.body.border.color = lv_color_hex3(0x46B);
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style_btn_pr.body.main_color = lv_color_hex3(0x8BD);
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style_btn_pr.body.grad_color = lv_color_hex3(0x24A);
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style_btn_pr.body.shadow.width = 2;
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style_btn_pr.text.color = lv_color_hex3(0xBCD);
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lv_btn_set_style(btn, LV_BTN_STYLE_REL, &style_btn_rel); /*Set the button's released style*/
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lv_btn_set_style(btn, LV_BTN_STYLE_PR, &style_btn_pr); /*Set the button's pressed style*/
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```
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### Slider and object alignment
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```c
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lv_obj_t * label;
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...
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/* Create a slider in the center of the display */
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lv_obj_t * slider = lv_slider_create(lv_scr_act(), NULL);
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lv_obj_set_width(slider, 200); /*Set the width*/
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lv_obj_align(slider, NULL, LV_ALIGN_CENTER, 0, 0); /*Align to the center of the parent (screen)*/
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lv_obj_set_event_cb(slider, slider_event_cb); /*Assign an event function*/
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/* Create a label below the slider */
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label = lv_label_create(lv_scr_act(), NULL);
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lv_label_set_text(label, "0");
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lv_obj_set_auto_realign(slider, true);
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lv_obj_align(label, slider, LV_ALIGN_OUT_BOTTOM_MID, 0, 10);
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...
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void slider_event_cb(lv_obj_t * slider, lv_event_t event)
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{
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if(event == LV_EVENT_VALUE_CHANGED) {
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static char buf[4]; /* max 3 bytes for number plus 1 null terminating byte */
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snprintf(buf, 4, "%u", lv_slider_get_value(slider));
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lv_label_set_text(slider_label, buf); /*Refresh the text*/
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}
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}
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```
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### List and themes
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```c
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/*Texts of the list elements*/
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const char * txts[] = {"First", "Second", "Third", "Forth", "Fifth", "Sixth", NULL};
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/* Initialize and set a theme. `LV_THEME_NIGHT` needs to enabled in lv_conf.h. */
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lv_theme_t * th = lv_theme_night_init(20, NULL);
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lv_theme_set_current(th);
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/*Create a list*/
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lv_obj_t* list = lv_list_create(lv_scr_act(), NULL);
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lv_obj_set_size(list, 120, 180);
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lv_obj_set_pos(list, 10, 10);
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/*Add buttons*/
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uint8_t i;
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for(i = 0; txts[i]; i++) {
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lv_obj_t * btn = lv_list_add_btn(list, LV_SYMBOL_FILE, txts[i]);
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lv_obj_set_event_cb(btn, list_event); /*Assign event function*/
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lv_btn_set_toggle(btn, true); /*Enable on/off states*/
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}
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/* Initialize and set an other theme. `LV_THEME_MATERIAL` needs to enabled in lv_conf.h.
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* If `LV_TEHE_LIVE_UPDATE 1` then the previous list's style will be updated too.*/
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th = lv_theme_material_init(210, NULL);
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lv_theme_set_current(th);
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/*Create an other list*/
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list = lv_list_create(lv_scr_act(), NULL);
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lv_obj_set_size(list, 120, 180);
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lv_obj_set_pos(list, 150, 10);
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/*Add buttons with the same texts*/
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for(i = 0; txts[i]; i++) {
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lv_obj_t * btn = lv_list_add_btn(list, LV_SYMBOL_FILE, txts[i]);
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lv_obj_set_event_cb(btn, list_event);
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lv_btn_set_toggle(btn, true);
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}
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...
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static void list_event(lv_obj_t * btn, lv_event_t e)
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{
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if(e == LV_EVENT_CLICKED) {
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printf("%s\n", lv_list_get_btn_text(btn));
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}
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}
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```
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### Use LittlevGL from Micropython
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Learn more about [Micropython](https://docs.littlevgl.com/en/html/get-started/micropython).
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### Use LVGL from Micropython
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Learn more about [Micropython](https://docs.lvgl.io/en/html/get-started/micropython).
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```python
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# Create a Button and a Label
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scr = lv.obj()
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@ -377,22 +265,17 @@ lv.scr_load(scr)
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```
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## Contributing
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To ask questions please use the [Forum](https://forum.littlevgl.com).
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For development-related things (bug reports, feature suggestions) use [GitHub's Issue tracker](https://github.com/littlevgl/lvgl/issues).
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To ask questions please use the [Forum](https://forum.lvgl.io).
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For development-related things (bug reports, feature suggestions) use [GitHub's Issue tracker](https://github.com/lvgl/lvgl/issues).
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If you are interested in contributing to LittlevGL you can
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- **Help others** in the [Forum](https://forum.littlevgl.com).
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- **Inspire people** by speaking about your project in [My project](https://forum.littlevgl.com/c/my-projects) category in the Forum or add it to the [References](https://blog.littlevgl.com/2018-12-26/references) post
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- **Improve and/or translate the documentation.** Go to the [Documentation](https://github.com/littlevgl/docs) repository to learn more
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If you are interested in contributing to LVGL you can
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- **Help others** in the [Forum](https://forum.lvgl.io).
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- **Inspire people** by speaking about your project in [My project](https://forum.lvgl.io/c/my-projects) category in the Forum.
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- **Improve and/or translate the documentation.** Go to the [Documentation](https://github.com/lvgl/docs) repository to learn more
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- **Write a blog post** about your experiences. See how to do it in the [Blog](https://github.com/littlevgl/blog) repository
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- **Report and/or fix bugs** in [GitHub's issue tracker](https://github.com/littlevgl/lvgl/issues)
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- **Help in the developement**. Check the [Open issues](https://github.com/littlevgl/lvgl/issues) especially the ones with [Help wanted](https://github.com/littlevgl/lvgl/issues?q=is%3Aissue+is%3Aopen+label%3A%22help+wanted%22) label and tell your ideas about a topic or implement a feature.
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- **Report and/or fix bugs** in [GitHub's issue tracker](https://github.com/lvgl/lvgl/issues)
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- **Help in the developement**. Check the [Open issues](https://github.com/lvgl/lvgl/issues) especially the ones with [Help wanted](https://github.com/lvgl/lvgl/issues?q=is%3Aissue+is%3Aopen+label%3A%22help+wanted%22) label and tell your ideas about a topic or implement a feature.
|
||||
|
||||
It should be useful to read the
|
||||
- [Contributing guide](https://blog.littlevgl.com/2018-12-06/contributing)
|
||||
- [Coding style guide](https://github.com/littlevgl/lvgl/blob/master/docs/CODING_STYLE.md)
|
||||
|
||||
## Donate
|
||||
If you are pleased with the library, found it useful, or you are happy with the support you got, please help its further development:
|
||||
|
||||
[](https://littlevgl.com/donate)
|
||||
Before sending Pull requests, please read the following guides:
|
||||
- [Contributing guide](https://blog.lvgl.com/2018-12-06/contributing)
|
||||
- [Coding style guide](https://github.com/lvgl/lvgl/blob/master/docs/CODING_STYLE.md)
|
||||
|
||||
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Reference in New Issue
Block a user