RIOT/examples/guides/saul/main.c

/*
 * SPDX-FileCopyrightText: 2025 Tom Hert <git@annsann.eu>
 * SPDX-FileCopyrightText: 2025 HAW Hamburg
 * SPDX-License-Identifier: LGPL-2.1-only
 */

#include <stdio.h>

#include "board.h"
#include "saul_reg.h"
#include "ztimer.h"

int main(void) {
  /* We sleep for 5 seconds to allow the system to initialize */
  ztimer_sleep(ZTIMER_MSEC, 5000);
  puts("Welcome to SAUL magic!");

  /* Define our temperature sensor */
  saul_reg_t *temperature_sensor = saul_reg_find_type(SAUL_SENSE_TEMP);

  /* Exit if we can't find a temperature sensor */
  if (!temperature_sensor) {
    puts("No temperature sensor found");
    return 1;
  } else {
    /*
     * Otherwise print the name of the temperature sensor
     * and continue the program
     */
    printf("Temperature sensor found: %s\n", temperature_sensor->name);
  }

  /* We start an infinite loop to continuously read the temperature */
  while (1) {
    /* Define a variable to store the temperature */
    phydat_t temperature;

    /*
     * Read the temperature sensor
     * and store the result in the temperature variable
     * saul_reg_read returns the dimension of the data read (1 in this case)
     */
    int dimension = saul_reg_read(temperature_sensor, &temperature);

    /* If the read was successful (1+ Dimensions), print the temperature */
    if (dimension <= 0) {
      puts("Error reading temperature sensor");
      return 1;
    }

    /* Dump the temperature to the console */
    phydat_dump(&temperature, dimension);

    /* Sleep for 1 seconds */
    ztimer_sleep(ZTIMER_MSEC, 1000);
  }
}