samples: sensor: pressure_polling: Log altitude only if supported

This sample application periodically reads the sensor

temperature and pressure, displaying the

values on the console along with a timestamp since startup.

It also displays the estimated altitude if floating point is supported.

It also displays the estimated altitude if floating point is supported

and the sensor provides altitude data.

Wiring

*******

## Default configuration

   Found device "icp101xx@63", getting sensor data

   [00:00:00.266,479] <inf> PRESSURE_POLLING: Starting pressure and altitude polling sample.

   [00:00:00.273,803] <inf> PRESSURE_POLLING: temp 25.49 Cel, pressure 96.271438 kPa, altitude 447.208465 m

   [00:00:00.280,914] <inf> PRESSURE_POLLING: temp 25.50 Cel, pressure 96.271331 kPa, altitude 447.234161 m

   [00:00:00.288,024] <inf> PRESSURE_POLLING: temp 25.49 Cel, pressure 96.266685 kPa, altitude 447.636077 m

   [00:00:00.295,135] <inf> PRESSURE_POLLING: temp 25.50 Cel, pressure 96.267951 kPa, altitude 447.537078 m

   [00:00:00.302,246] <inf> PRESSURE_POLLING: temp 25.51 Cel, pressure 96.268577 kPa, altitude 447.488281 m

   [00:00:00.309,356] <inf> PRESSURE_POLLING: temp 25.50 Cel, pressure 96.269340 kPa, altitude 447.414978 m

   [00:00:00.316,467] <inf> PRESSURE_POLLING: temp 25.50 Cel, pressure 96.268562 kPa, altitude 447.473663 m

   [00:00:00.323,547] <inf> PRESSURE_POLLING: temp 25.50 Cel, pressure 96.267341 kPa, altitude 447.596496 m

   Starting pressure and altitude polling sample.

   temp 25.49 Cel, pressure 96.271438 kPa, altitude 447.208465 m

   temp 25.50 Cel, pressure 96.271331 kPa, altitude 447.234161 m

   temp 25.49 Cel, pressure 96.266685 kPa, altitude 447.636077 m

   temp 25.50 Cel, pressure 96.267951 kPa, altitude 447.537078 m

   temp 25.51 Cel, pressure 96.268577 kPa, altitude 447.488281 m

   temp 25.50 Cel, pressure 96.269340 kPa, altitude 447.414978 m

   temp 25.50 Cel, pressure 96.268562 kPa, altitude 447.473663 m

   temp 25.50 Cel, pressure 96.267341 kPa, altitude 447.596496 m

   <repeats endlessly>

#include <zephyr/devicetree.h>

#include <zephyr/drivers/sensor.h>

#include <stdio.h>

#include <zephyr/logging/log.h>

LOG_MODULE_REGISTER(PRESSURE_POLLING, CONFIG_SENSOR_LOG_LEVEL);

/*

 * Get a device structure from a devicetree node from alias

int main(void)

{

	const struct device *dev = get_pressure_sensor_device();

	int ret;

	if (dev == NULL) {

		return 0;

	struct sensor_value temperature;

	struct sensor_value altitude;

	LOG_INF("Starting pressure and altitude polling sample.\n");

	printk("Starting pressure, temperature and altitude polling sample.\n");

	while (1) {

		if (sensor_sample_fetch_chan(dev, SENSOR_CHAN_ALL) == 0) {

			sensor_channel_get(dev, SENSOR_CHAN_PRESS, &pressure);

			sensor_channel_get(dev, SENSOR_CHAN_AMBIENT_TEMP, &temperature);

			sensor_channel_get(dev, SENSOR_CHAN_ALTITUDE, &altitude);

			ret = sensor_channel_get(dev, SENSOR_CHAN_ALTITUDE, &altitude);

			LOG_INF("temp %.2f Cel, pressure %f kPa, altitude %f m",

			printk("temp %.2f Cel, pressure %f kPa",

			       sensor_value_to_double(&temperature),

				sensor_value_to_double(&pressure),

				sensor_value_to_double(&altitude));

			       sensor_value_to_double(&pressure));

			if (ret == 0) {

				printk(", altitude %f m", sensor_value_to_double(&altitude));

			}

			printk("\n");

		}

	}

	return 0;