JON95Git/zephyr-out-of-tree-driver-st7789

A simple example to demonstrate how to create an out-of-tree driver in Zephyr RTOS

Zephyr out-of-tree driver ST7789-no-cs

A simple example to demonstrate how to create an out-of-tree driver in Zephyr RTOS. The custom driver is an altered version of ST7789v device driver for a display without CS pin.

The application example creates a LVGL widget in Zephyr RTOS running on a nRF52840_mdk.

Dependencies

• Zephyr RTOS v3.1.0

Helpul links

• https://blog.golioth.io/adding-an-out-of-tree-sensor-driver-to-zephyr/

• https://docs.zephyrproject.org/latest/samples/application_development/out_of_tree_driver/README.html

• https://github.com/zephyrproject-rtos/example-application

Tree folder structure

.
├── CMakeLists.txt
├── drivers
│   └── zephyr
│       ├── CMakeLists.txt
│       ├── display
│       │   ├── CMakeLists.txt
│       │   ├── Kconfig
│       │   └── st7789v_no_cs
│       │       ├── CMakeLists.txt
│       │       ├── display_st7789v_no_cs.c
│       │       ├── display_st7789v_no_cs.h
│       │       └── Kconfig
│       ├── Kconfig
│       └── module.yml
├── dts
│   └── bindings
│       └── display
│           └── sitronix,st7789v-no-cs.yaml
├── Kconfig
├── nrf52840_mdk.overlay
├── prj.conf
└── src
    ├── lvgl_sample.c
    ├── lvgl_sample.h
    └── main.c

Tests

It was tested in a nRF52840_mdk board.

Pinout

nRF52840_mdk	ST7789
P0.28	RES
P0.29	DC (CMD)
P0.27	SCK (SCL)
P0.26	MOSI (SDA)

How to build

$ west build -p auto -b nrf52840_mdk

How to flash

$ west flash

Application running