text: /*
  * The MIT License (MIT)
  *
  * Author: Assam Boudjelthia
  * Copyright (c) 2018 Rohm Semiconductor.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
  * the Software without restriction, including without limitation the rights to
  * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
  * the Software, and to permit persons to whom the Software is furnished to do so,
  * subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in all
  * copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
  * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
  * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
  * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
  
  #include <iostream>
  #include <signal.h>
  #include  <sys/time.h>
  #include "bh1792.hpp"
  #include "upm_utilities.h"
  
  bool isStopped;
  upm::BH1792 dev;
  
  void signal_int_handler(int signo)
  {
      if (signo == SIGINT)
          isStopped = true;
  }
  
  //! [Interesting]
  void PrintData(void *args)
  {
      std::vector<std::vector<int>> fifo;
      struct timespec now;
  
      clock_gettime(CLOCK_MONOTONIC_RAW, &now);
      try {
          fifo = dev.GetFifoData();
  
          std::cout << "\nHeart beat sensor FIFO data:" << std::endl;
          for(int i = 0; i < 32; i++)
              std::cout << i << ": off: " << fifo.at(i).at(0) << ", on: " <<
                          fifo.at(i).at(1) << std::endl;
  
          std::cout << "timestamp " << now.tv_sec << " sec, " << now.tv_nsec <<
                      " nsec" << std::endl;
      } catch (std::exception& e) {
          std::cout << "Failed to read FIFO data" << std::endl;
          throw;
      }
  }
  
  int main(int argc, char **argv)
  {
      float measTime;
  
      signal(SIGINT, signal_int_handler);
      dev.SoftReset();
      dev.EnableSyncMode(256, 32);
      std::cout << "Installing ISR" << std::endl;
      dev.InstallISR(MRAA_GPIO_EDGE_FALLING, 33, &PrintData, NULL);
      measTime = dev.GetMeasurementTimeMS();
      dev.StartMeasurement();
  
      while(!isStopped) {
          usleep(measTime * 1000);
      }
  
      return 0;
  }
  //! [Interesting]
  