Function maxDetectLowHighWait

wiringPi/rht03.c:40–73

 */

static int maxDetectLowHighWait (const int pin)
{
  struct timeval now, timeOut, timeUp ;

// If already high then wait for pin to go low

  gettimeofday (&now, NULL) ;
  timerclear   (&timeOut) ;
  timeOut.tv_usec = 1000 ;
  timeradd     (&now, &timeOut, &timeUp) ;

  while (digitalRead (pin) == HIGH)
  {
    gettimeofday (&now, NULL) ;
    if (timercmp (&now, &timeUp, >))
      return false ;
  }

// Wait for it to go HIGH

  gettimeofday (&now, NULL) ;
  timerclear (&timeOut) ;
  timeOut.tv_usec = 1000 ;
  timeradd (&now, &timeOut, &timeUp) ;

  while (digitalRead (pin) == LOW)
  {
    gettimeofday (&now, NULL) ;
    if (timercmp (&now, &timeUp, >))
      return false ;
  }

  return true ;
}


/*