Disabling UART on Due?

Hardware Arduino Due
26

I am working with K-line that is similar to yours. My code starts the bit-bang before activating the UART1.
I am using UART0 for debug. This is on a 1284 chip.

  digitalWrite (TX, HIGH); // makes K-line high 3
  digitalWrite(ledPin,HIGH);
  delay(2000);       // wait for K-line to be clear 3
  digitalWrite (TX, LOW); // makes K-line low  3
  delay(25);
  digitalWrite (TX, HIGH); // makes K-line high  3
  delay(25);        //last delay before first message
  Serial1.begin(10400);

Also, I think there is a function called Serial.end() to stop serial comms.. I am not positive about it though.