93 lines
2.9 KiB
ReStructuredText
93 lines
2.9 KiB
ReStructuredText
.. zephyr:code-sample:: lvgl
|
|
:name: LVGL basic sample
|
|
:relevant-api: display_interface input_interface
|
|
|
|
Display a "Hello World" and react to user input using LVGL.
|
|
|
|
Overview
|
|
********
|
|
|
|
This sample application displays "Hello World" in the center of the screen
|
|
and a counter at the bottom which increments every second.
|
|
Based on the available input devices on the board used to run the sample,
|
|
additional widgets may be displayed and additional interactions enabled:
|
|
|
|
* Pointer
|
|
If your board has a touch panel controller
|
|
(:dtcompatible:`zephyr,lvgl-pointer-input`), a button widget is displayed
|
|
in the center of the screen. Otherwise a label widget is displayed.
|
|
* Button
|
|
The button pseudo device (:dtcompatible:`zephyr,lvgl-button-input`) maps
|
|
a press/release action to a specific coordinate on screen. In the case
|
|
of this sample, the coordinates are mapped to the center of the screen.
|
|
* Encoder
|
|
The encoder pseudo device (:dtcompatible:`zephyr,lvgl-encoder-input`)
|
|
can be used to navigate between widgets and edit their values. If the
|
|
board contains an encoder, an arc widget is displayed, which can be
|
|
edited.
|
|
* Keypad
|
|
The keypad pseudo device (:dtcompatible:`zephyr,lvgl-keypad-input`) can
|
|
be used for focus shifting and also entering characters inside editable
|
|
widgets such as text areas. If the board used with this sample has a
|
|
keypad device, a button matrix is displayed at the bottom of the screen
|
|
to showcase the focus shifting capabilities.
|
|
|
|
Requirements
|
|
************
|
|
|
|
Display shield and a board which provides a configuration
|
|
for Arduino connectors, for example:
|
|
|
|
- :ref:`adafruit_2_8_tft_touch_v2` and :ref:`nrf52840dk_nrf52840`
|
|
- :ref:`buydisplay_2_8_tft_touch_arduino` and :ref:`nrf52840dk_nrf52840`
|
|
- :ref:`ssd1306_128_shield` and :ref:`frdm_k64f`
|
|
|
|
or a board with an integrated display:
|
|
|
|
- :ref:`esp_wrover_kit`
|
|
|
|
or a simulated display environment in a :ref:`native_sim <native_sim>` application:
|
|
|
|
- :ref:`native_sim`
|
|
- `SDL2`_
|
|
|
|
or
|
|
|
|
- :ref:`mimxrt1050_evk`
|
|
- `RK043FN02H-CT`_
|
|
|
|
or
|
|
|
|
- :ref:`mimxrt1060_evk`
|
|
- `RK043FN02H-CT`_
|
|
|
|
Building and Running
|
|
********************
|
|
|
|
Example building for :ref:`nrf52840dk_nrf52840`:
|
|
|
|
.. zephyr-app-commands::
|
|
:zephyr-app: samples/subsys/display/lvgl
|
|
:board: nrf52840dk_nrf52840
|
|
:shield: adafruit_2_8_tft_touch_v2
|
|
:goals: build flash
|
|
|
|
Example building for :ref:`native_sim <native_sim>`:
|
|
|
|
.. zephyr-app-commands::
|
|
:zephyr-app: samples/subsys/display/lvgl
|
|
:board: native_sim
|
|
:goals: build run
|
|
|
|
Alternatively, if building from a 64-bit host machine, the previous target
|
|
board argument may also be replaced by ``native_sim_64``.
|
|
|
|
References
|
|
**********
|
|
|
|
.. target-notes::
|
|
|
|
.. _LVGL Web Page: https://lvgl.io/
|
|
.. _SDL2: https://www.libsdl.org
|
|
.. _RK043FN02H-CT: https://www.nxp.com/products/processors-and-microcontrollers/arm-based-processors-and-mcus/i.mx-applications-processors/i.mx-rt-series/4.3-lcd-panel:RK043FN02H-CT
|