Serial driven interrupt

Official Hardware Mega Due
1

hi everyone,
i wrote a code in which i poll the status of some sensors and if data are received on the Serial Arduino enables some little motors.
this is the pseudo-code:

void setup(){
  Serial.begin(baudRate);
  initialize_Motor_pins();
  calibrateSensors();
}

void loop(){
  readSensorStatus(); //there are 26 capacitive sensors;
  if(Serial.available()){
  char letter = serial.read()
  switch(letter){
  case 'a' : activateMotors(1);
  case 'b' : activateMotors(2);
  . 
  .
  .
//each letter received activates a different motor
  .
  .
  .
}
}

is there any way i can manage the Serial.available event as an interrupt?

i hope i was clear. thank for the help

2

The closest thing that I know of is serialEvent(). Each time loop() starts, the buffer is checked and if serial has come in it branches to a service routine.