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I am developing application with serial communication with arduino due.

Like this:

while(1)
{
  if(Serial2.available() > 0){
  byte l_byData = Serial2.read ();
  Serial.println(l_byData,HEX);
  }
}

But I am getting "0xFF" from serial very frequently.

I am using Arduino 1.6.6 IDE.

Can anyone help on this?

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12
  • When you say you are "getting 0xFF", do you mean that's what is displayed in the serial monitor? – The Guy with The Hat Dec 21 '15 at 16:38
  • Maybe that's what's being sent. What code are you using to send the data and do the baud rates match on both devices ? – Bra1n Dec 21 '15 at 16:49
  • Yes. it was displayed in the serial monitor. – hariprasath Dec 21 '15 at 16:57
  • Baud rate is same on both the devices. – hariprasath Dec 21 '15 at 16:58
  • Is there is any bug in the serial library? – hariprasath Dec 21 '15 at 16:59
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Check baud rate, voltage levels. Better check your signals with a oscilloscope or at least check it with a serial dongle like this https://www.sparkfun.com/products/11814

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Is it possible you've accidentally enabled the pull-up resistor on that GPIO or have it wired to vcc by accident? A constant high signal will resent as all 1s (0xFF)

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