Zephyr drivers

Keywords: sensor interrupts : sensor triggers : Zephyr triggers : sensor interrupt support

OVERVIEW

This page a stash point to hold Zephyr driver notes. Zephyr RTOS project includes a range of types of drivers. First type referenced by this page will be Zephyr's sensor drivers.

^ Zephyr Sensor Model

Zephyr 4.3.0 device driver documentation:

• https://docs.zephyrproject.org/4.3.0/doxygen/html/group__io__interfaces.html

Zephyr 4.3.0 sensor model:

• https://docs.zephyrproject.org/4.3.0/doxygen/html/group__sensor__interface.html

"Sensor attribute get" function prototype. This prototype reveals Zephyr's enumerations for sensor yyy . . .

• https://docs.zephyrproject.org/4.3.0/doxygen/html/group__sensor__interface.html#gaedfdfc71dce702dc1fb1c6e60ff0f73a

Zephyr's sensor model plays a big role in the design of sensor drivers for this RTOS. Zephyr's [... sensor.h] header defines many things. Two important enums from this header file are:

_ Sensor channel enum _

• https://github.com/zephyrproject-rtos/zephyr/blob/main/include/zephyr/drivers/sensor.h#L65

_ Sensor attribute enum _

• https://github.com/zephyrproject-rtos/zephyr/blob/main/include/zephyr/drivers/sensor.h#L342

Sensor channels generally correspond to readings of a quantity in specific units, like degrees centigrade and acceleration in the x-axis. Sensor attributes generally corrrespond to configuration settings for a sensor, where these settings modify the way in which readings are taken and reported.

For a Zephyr driver to support configuration of a sensor's attributes, it must implement a function of the form:

sensor_attr_set()
int sensor_attr_set	(	const struct device *	dev,
enum sensor_channel	chan,
enum sensor_attribute	attr,
const struct sensor_value *	val )

. . . whose typedef is at https://github.com/zephyrproject-rtos/zephyr/blob/main/include/zephyr/drivers/sensor.h#L431.

^ References

1. https://github.com/zephyrproject-rtos/zephyr/issues/30133

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