This is the documentation for the latest (main) development branch of Zephyr. If you are looking for the documentation of previous releases, use the drop-down menu on the left and select the desired version.

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:

• Adafruit 2.8” TFT Touch Shield v2 and nRF52840 DK

• Buydisplay 2.8” TFT Touch Shield with Arduino adapter and nRF52840 DK

• SSD1306 128x64(/32) pixels generic shield and NXP FRDM-K64F

or a board with an integrated display:

• ESP-WROVER-KIT

or a simulated display environment in a native Posix application:

• Native POSIX execution (native_posix)

• SDL2 1

or

• NXP MIMXRT1050-EVK

• RK043FN02H-CT 2

or

• NXP MIMXRT1060-EVK

• RK043FN02H-CT 2

Building and Running

Note

When deferred logging is enabled you will likely need to increase CONFIG_LOG_STRDUP_BUF_COUNT and/or CONFIG_LOG_STRDUP_MAX_STRING to make sure no messages are lost or truncated.

Example building for nRF52840 DK:

# From the root of the zephyr repository
west build -b nrf52840dk_nrf52840 samples/subsys/display/lvgl -- -DSHIELD=adafruit_2_8_tft_touch_v2
west flash

Example building for Native POSIX execution (native_posix):

# From the root of the zephyr repository
west build -b native_posix samples/subsys/display/lvgl
west build -t run

Alternatively, if building from a 64-bit host machine, the previous target board argument may also be replaced by native_posix_64.

References

1

https://www.libsdl.org

2(1,2)

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