RE: device driver API

Einarh — Mon, 14 Feb 2022 10:31:03 GMT

Hello!

The sample you are referring to is using Zephyr's Devicetree API to access the I2C peripheral, which is the recommended method for accessing peripherals in Zephyr.

In the application the device is defined like this:

#define I2C_DEV DT_LABEL(DT_ALIAS(i2c_0))

~~~~

const struct device *i2c_dev;

i2c_dev = device_get_binding(I2C_DEV);

This code finds hardware specifications in the board specific devicetree file, and saves them in a device struct which is then used to access the device in the application.

Putting the hardware specifications in a devicetree file makes your code more portable, because you can compile your application for a different board just by changing the devicetree overlay, while using the same application code.

You ca read more about Zephyr's devicetree here:

https://docs.zephyrproject.org/latest/guides/dts/intro.html

http://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/reference/devicetree/api.html

Hope this helps, best regards,

Einar