Wiki: Implementing device interface drivers utilizing Zephyr and DT API

[chriskhoury01]

Our first goal is to initialize the SPI pins between the ESP32C3-devkitc and the CC1200.

The ESP32C3 DeviceTree gets compiled to a C header that defines the hardware connections (i.e. GPIOS) made in the SPUR-SBR.

• DeviceTree definitions and bindings are at https://github.com/k5utd/OpenRTX/tree/spur-sbr/platform/targets/spur-sbr/spur-sbr.dts . Comment the relative path to the file where a pin is initialized i.e. /platform/drivers/baseband/CC1200.cpp
• Most of the current work was sourced from the Zephyr Project at https://github.com/zephyrproject-rtos/zephyr/tree/main/boards/riscv/esp32c3_devkitm
• the initialization of DeviceTree definitions and bindings will happen in files such as https://github.com/k5utd/OpenRTX/tree/spur-sbr/platform/drivers/baseband/CC1200.cpp

DeviceTree Guide:

• https://docs.zephyrproject.org/latest/build/dts/index.html#devicetree-guide

Bindings for ESP32-SPI and CC1200: -https://docs.zephyrproject.org/3.0.0/reference/devicetree/bindings/spi/espressif%2Cesp32-spi.html#dtbinding-espressif-esp32-spi

https://docs.zephyrproject.org/latest/build/dts/api/bindings/ieee802154/ti,cc1200.html

Examples: https://github.com/aaron-mohtar-co/Lemon-IoT-LTE-nRF9160/blob/main/Examples/spi_sensor/boards/lemon_iot_lte_nrf9160_ns.overlay

https://www.zephyrproject.org/how-to-set-up-esp32-gpio-pins-in-zephyr-rtos/

[muhilans1]

What is this the SPI device interface for?

[ericmutton]

What is this SPI device interface for?

This is to have a usable SPI interface stub for posterity.

A working understanding of interfaces should be available as part of future documentation, together with a generic interface stub for future interface development.