Arduino Serial connection

gistfile1.cpp

#define LED_PIN 13

void setup(){
  pinMode(LED_PIN, OUTPUT); 
  Serial.begin(9600);
}

void loop(){
  int input;
  input = Serial.read();
  if(input == -1){
    return;
  }
  switch(input){
  case 'o':
    Serial.print("LED ON\n");
    digitalWrite(LED_PIN, HIGH);
    break;
  case 'p':
    Serial.print("LED OFF\n");
    digitalWrite(LED_PIN, LOW);
    break;   
  case 'b':
    Serial.print("LED Blinking\n");
    brink10();
    break;   
  }
  Serial.print("READY\n");
}

void brink10(){
  for(int i=0; i<10; i++){
    digitalWrite(LED_PIN, HIGH);
    delay(200);
    digitalWrite(LED_PIN, LOW);
    delay(200);
  } 
}