Function drcSetupSerial

wiringPi/drcSerial.c:147–197

 */

int drcSetupSerial (const int pinBase, const int numPins, const char *device, const int baud)
{
  int fd ;
  int ok, tries ;
  time_t then ;
  struct wiringPiNodeStruct *node ;

  if ((fd = serialOpen (device, baud)) < 0)
    return false ;

  delay (10) ;	// May need longer if it's an Uno that reboots on the open...

// Flush any pending input

  while (serialDataAvail (fd))
    (void)serialGetchar (fd) ;

  ok = false ;
  for (tries = 1 ; (tries < 5) && (!ok) ; ++tries)
  {
    serialPutchar (fd, '@') ;		// Ping
    then = time (NULL) + 2 ;
    while (time (NULL) < then)
      if (serialDataAvail (fd))
      {
        if (serialGetchar (fd) == '@')
        {
          ok = true ;
          break ;
        }
      }
  }

  if (!ok)
  {
    serialClose (fd) ;
    return false ;
  }

  node = wiringPiNewNode (pinBase, numPins) ;

  node->fd              = fd ;
  node->pinMode         = myPinMode ;
  node->pullUpDnControl = myPullUpDnControl ;
  node->analogRead      = myAnalogRead ;
  node->digitalRead     = myDigitalRead ;
  node->digitalWrite    = myDigitalWrite ;
  node->pwmWrite        = myPwmWrite ;

  return true ;
}