mirror of
https://github.com/lvgl/lvgl.git
synced 2025-01-28 07:03:00 +08:00
b1bf7fd29a
Create one GitHub workflow job for each build option build
or test execution. This allows each of the five builds to
be executed in parallel as well as making it easier to
navigate to the test output as it now resides in its own
job.
This change **does** change the command-line arguments to
the test execution script. This is required to allow the
build options name to be passed in.
New `tests/main.py` command-line help:
```
usage: main.py [-h] [--build-options BUILD_OPTIONS] [--clean]
[--report]
[{build,test} [{build,test} ...]]
Build and/or run LVGL tests.
positional arguments:
{build,test} build: compile build tests, test:
compile/run executable tests.
optional arguments:
-h, --help show this help message and exit
--build-options BUILD_OPTIONS
the build option name to build or run.
When omitted all build configurations
are used.
--clean clean existing build artifacts before
operation.
--report generate code coverage report for
tests.
This program builds and optionally runs the LVGL test programs.
There are two types of LVGL tests: "build", and "test". The
build-only tests, as their name suggests, only verify that the
program successfully compiles and links (with various build
options). There are also a set of tests that execute to verify
correct LVGL library behavior.
```
LVGL - Light and Versatile Graphics Library
LVGL provides everything you need to create an embedded GUI with easy-to-use graphical elements, beautiful visual effects and a low memory footprint.
Website · Docs · Forum · Services · Interactive examples
Table of content
Overview
Features
- Powerful building blocks: buttons, charts, lists, sliders, images, etc.
- Advanced graphics engine: animations, anti-aliasing, opacity, smooth scrolling, blending modes, etc
- Supports various input devices: touchscreen, mouse, keyboard, encoder, buttons, etc.
- Supports multiple displays
- Hardware independent, can be use with any microcontroller and display
- Scalable to operate with little memory (64 kB Flash, 16 kB RAM)
- Multi-language support with UTF-8 handling, CJK, Bidirectional and Arabic script support
- Fully customizable graphical elements via CSS-like styles
- Powerful layouts inspired by CSS: Flexbox and Grid
- OS, External memory and GPU are supported but not required. (built in support for STM32 DMA2D, and NXP PXP and VGLite)
- Smooth rendering even with a single frame buffer
- Written in C and compatibile with C++
- Micropython Binding exposes LVGL API in Micropython
- Simulator to develop on PC without embedded hardware
- 100+ simple Examples
- Documentation and API references online and in PDF
Requirements
Basically, every modern controller (which is able to drive a display) is suitable to run LVGL. The minimal requirements are:
| Name | Minimal | Recommended |
| Architecture | 16, 32 or 64 bit microcontroller or processor | |
| Clock | > 16 MHz | > 48 MHz |
| Flash/ROM | > 64 kB | > 180 kB |
| Static RAM | > 16 kB | > 48 kB |
| Draw buffer | > 1 × hor. res. pixels | > 1/10 screen size |
| Compiler | C99 or newer | |
Note that the memory usage might vary depending on the architecture, compiler and build options.
Supported platforms
LVGL is completely platform independent and can be used with any MCU that fulfills the requirements. Just to mention some platforms:
- NXP: Kinetis, LPC, iMX, iMX RT
- STM32F1, STM32F3, STM32F4, STM32F7, STM32L4, STM32L5, STM32H7
- Microchip dsPIC33, PIC24, PIC32MX, PIC32MZ
- Linux frame buffer (/dev/fb)
- Raspberry Pi
- Espressif ESP32
- Infineon Aurix
- Nordic NRF52 Bluetooth modules
- Quectel modems
LVGL is also avaiable as:
- Arduino library
- PlatformIO package
- Zephyr library
- ESP32 component
- NXP MCUXpresso component
- NuttX library
Get started
This list shows the recommended way of learning the library:
- Check the Online demos to see LVGL in action (3 minutes)
- Read the Introduction page of the documentation (5 minutes)
- Get familiar with the basics on the Quick overview page (15 minutes)
- Set up a Simulator (10 minutes)
- Try out some Examples
- Port LVGL to a board. See the Porting guide or check the ready to use Projects
- Read the Overview page to get a better understanding of the library (2-3 hours)
- Check the documentation of the Widgets to see their features and usage
- If you have questions go to the Forum
- Read the Contributing guide to see how you can help to improve LVGL (15 minutes)
Examples
For more examples see the examples folder.
C
lv_obj_t * btn = lv_btn_create(lv_scr_act()); /*Add a button to the current screen*/
lv_obj_set_pos(btn, 10, 10); /*Set its position*/
lv_obj_set_size(btn, 100, 50); /*Set its size*/
lv_obj_add_event_cb(btn, btn_event_cb, LV_EVENT_CLICKED, NULL); /*Assign a callback to the button*/
lv_obj_t * label = lv_label_create(btn); /*Add a label to the button*/
lv_label_set_text(label, "Button"); /*Set the labels text*/
lv_obj_center(label); /*Align the label to the center*/
...
void btn_event_cb(lv_event_t * e)
{
printf("Clicked\n");
}
Micropython
Learn more about Micropython.
def btn_event_cb(e):
print("Clicked")
# Create a Button and a Label
btn = lv.btn(lv.scr_act())
btn.set_pos(10, 10)
btn.set_size(100, 50)
btn.add_event_cb(btn_event_cb, lv.EVENT.CLICKED, None)
label = lv.label(btn)
label.set_text("Button")
label.center()
Services
LVGL Kft was established to provide a solid background for LVGL library. We offer several type of services to help you in UI development:
- Graphics design
- UI implementation
- Consulting/Support
For more information see https://lvgl.io/services Feel free to contact us if you have any questions.
Contributing
LVGL is an open project and contribution is very welcome. There are many ways to contribute from simply speaking about your project, through writing examples, improving the documentation, fixing bugs to hosting your own project under the LVGL organization.
For a detailed description of contribution opportunities visit the Contributing section of the documentation.