File content as of revision 4:f25a26f79c62:

/**
 ******************************************************************************
 * @file    main.cpp
 * @author  SRA
 * @version V1.0.0
 * @date    5-March-2019
 * @brief   Simple Example application for using the X_NUCLEO_IKS01A3 
 *          MEMS Inertial & Environmental Sensor Nucleo expansion board.
 ******************************************************************************
 * @attention
 *
 * <h2><center>&copy; COPYRIGHT(c) 2019 STMicroelectronics</center></h2>
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *   1. Redistributions of source code must retain the above copyright notice,
 *      this list of conditions and the following disclaimer.
 *   2. Redistributions in binary form must reproduce the above copyright notice,
 *      this list of conditions and the following disclaimer in the documentation
 *      and/or other materials provided with the distribution.
 *   3. Neither the name of STMicroelectronics nor the names of its contributors
 *      may be used to endorse or promote products derived from this software
 *      without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 *  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 ******************************************************************************
*/ 
 
/* Includes */
#include "mbed.h"
#include "XNucleoIKS01A3.h"
 
/* Instantiate the expansion board */
static XNucleoIKS01A3 *mems_expansion_board = XNucleoIKS01A3::instance(D14, D15, D4, D5, A3, D6, A4);
 
/* Retrieve the composing elements of the expansion board */
static STTS751Sensor *t_sensor = mems_expansion_board->t_sensor;

DigitalOut myled(LED1);
 
volatile int mems_event = 0;
uint32_t previous_tick = 0;
uint32_t current_tick = 0;
uint8_t high = 0, low = 0;
float temperature = 0.0f;
char buffer[32];

void INT_cb();

/* Helper function for printing floats & doubles */
static char *print_double(char* str, double v, int decimalDigits=2)
{
  int i = 1;
  int intPart, fractPart;
  int len;
  char *ptr;

  /* prepare decimal digits multiplicator */
  for (;decimalDigits!=0; i*=10, decimalDigits--);

  /* calculate integer & fractinal parts */
  intPart = (int)v;
  fractPart = (int)((v-(double)(int)v)*i);

  /* fill in integer part */
  sprintf(str, "%i.", intPart);

  /* prepare fill in of fractional part */
  len = strlen(str);
  ptr = &str[len];

  /* fill in leading fractional zeros */
  for (i/=10;i>1; i/=10, ptr++) {
    if (fractPart >= i) {
      break;
    }
    *ptr = '0';
  }

  /* fill in (rest of) fractional part */
  sprintf(ptr, "%i", fractPart);

  return str;
}

/* Simple main function */
int main() {
  /* Attach callback to STTS751 INT */
  t_sensor->attach_int_irq(&INT_cb);
  
  /* Enable STTS751 temperature sensor */
  t_sensor->enable();
  /* Set ODR to 4Hz */
  t_sensor->set_odr(4.0f);
  /* Set Low Temperature Threshold */
  t_sensor->set_low_temp_thr(22.0f);
  /* Set High Temperature Threshold */
  t_sensor->set_high_temp_thr(28.0f);
  /* Enable Event pin */
  t_sensor->set_event_pin(1);
  /* Get beginning status */
  t_sensor->get_temp_limit_status(NULL, NULL, NULL);

  previous_tick = clock();
  
  printf("\r\n--- Starting new run ---\r\n");
 
  while(1) {
    if (mems_event) {
      mems_event=0;
      uint8_t high_temp = 0, low_temp = 0;
      t_sensor->get_temp_limit_status(&high_temp, &low_temp, NULL);
      if (high_temp){
        high = 1;
        low = 0;
      }
      if (low_temp){
        low = 1;
        high = 0;
      }
    
      t_sensor->get_temperature(&temperature);
      myled = 1;
      wait(0.1);
      myled = 0;
    }

    current_tick = clock();
    if (((current_tick - previous_tick)/CLOCKS_PER_SEC) >= 2){
      if (!high && !low){
        t_sensor->get_temperature(&temperature);
      }
      printf("Temp[C]: ");
      printf("%7s C", print_double(buffer, temperature));
      if (high){
        printf(" High temperature detected!(>28C) \r\n");
        high = 0;
      } else if (low) {
        printf(" Low temperature detected!(<22C) \r\n");
        low = 0;
      } else {
        printf("\r\n");
      }
      previous_tick = clock();
    }
  }
}
 
void INT_cb() {
  mems_event = 1;
}