maarten1C96 / st7789v_lvgl

Zephyr + RPI_PICO_W + ST7789V Display Using LvGL.

Zephyr Support for ST7789V Display Using LVGL on a RPI_PICO_W

Overview

This sample application displays some simple LvGL capabilities using a Pico-W and ST7789V display panel.

It is hoped this project will provide a template for for ST7789 support on other SoC+board combinations.

See the following video links --

• Zephyr+Pico+LvGL

Requirements

Display panel and a board which provides a configuration for example:

• ST7789V based display panel: example.
• PICO or PICO-W Raspberry Pi RP2040 Eval Board.
• Momentary Switches example

Wiring and Soldering

The 0.10" headers will need to be soldered onto the display pannel. In addition, wiring between the display panel and the PCA10056 board needs to be made.
Review the overlay files for wire-to-pin specifics.

Be sure to wire the backlight pin, othewise the panel will remain dark.

How to Build

This project was developed using Zephyr V3.5, and successfully built on both Ubuntu and MacOS.

NOTE -- If you use the Segger Ozone debugger, you must update the ozone *.jdebug file. See ozone_pico_bootloader.txt for details.

NOTE -- The default resolution settings in the rpi_pico_w.overlay files are set to 320x170.
Many displays will have a resolution of 320x240, so update the height and width parameters according to your display panel's resolution.

CMake Method

This build method use cmake directly, and doesn't use west or ninja.

1. cd to st7789v_lvgl directory
2. ./configure.sh
3. cd build
4. make -j6

West Method

1. cd to st7789v_lvgl directory
2. rm -rf build
3. west build -b rpi_pico_w

Operation

There are four buttons assigned the following actions:

• Button1 -- Rotates the currently displayed page: 1-4 pages
• Button2 -- Within the currently displayed page, rotate though the editable fields.
• Button3 -- Within the current field, increase the value by step side.
• Button4 -- Within the current field, decrease the value by step side.

Screens (Pages) --

• Pg1 -- Shows slider widget. Use Button3 or Button4 to move slider.
• Pg2 -- Shows two editable fields and an icon. Use Button3 or Button4 to change field value.
• Pg3 -- Shows three labled fields. Use Button2 to select field. Use Button3 or Button4 to change value.
• Pg4 -- Shows only a simple graphic icon (old television test screen).