.. _lvgl-sample:
LittlevGL Basic Sample
######################
Overview
********
This sample application displays "Hello World" in the center of the screen
and a counter at the bottom which increments every second. If an input driver
is supported, such as the touch panel controller on mimxrt10{50,60,64}_evk
boards, "Hello World" is enclosed in a button that changes to the toggled state
when touched.
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 native Posix application:
- :ref:`native_posix`
- `SDL2`_
or
- :ref:`mimxrt1050_evk`
- `RK043FN02H-CT`_
or
- :ref:`mimxrt1060_evk`
- `RK043FN02H-CT`_
Building and Running
********************
.. note::
When deferred logging is enabled you will likely need to increase
:kconfig:option:`CONFIG_LOG_STRDUP_BUF_COUNT` and/or
:kconfig:option:`CONFIG_LOG_STRDUP_MAX_STRING` to make sure no messages are lost or
truncated.
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_posix`:
.. zephyr-app-commands::
:zephyr-app: samples/subsys/display/lvgl
:board: native_posix
:goals: build run
Alternatively, if building from a 64-bit host machine, the previous target
board argument may also be replaced by ``native_posix_64``.
References
**********
.. target-notes::
.. _LittlevGL Web Page: https://littlevgl.com/
.. _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
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