#define ledStartPin 2
#define totalPins 7

int pinState[totalPins];

void setup(){
  initPins();
  initSerial();
}


void loop(){
  sendSerialComm(); //send serial commands to reflect arduino states
  readSerialComm(); //recieve serial command from processing
  setPins(); //set the pin state base on the pinState array
}
//===================
void initSerial(){
  Serial.begin(14400);
}

void initPins(){ //define pin states and array for pin state storage
  for (int i=ledStartPin; i<ledStartPin+totalPins; i++){
    pinMode(i, OUTPUT);    
  }
  for (int i=0; i<totalPins; i++){//initialize array for storing pin state
    pinState[i]=-1; //-1 for off, 1 for on
  }  
}


void readSerialComm(){
                int incomingByte = 0;	// for incoming serial data  
 // send data only when you receive data:
	if (Serial.available() > 0) {
		// read the incoming byte:
		incomingByte = Serial.read();
		// say what you got:
//		Serial.print("I received: ");
//		Serial.println(incomingByte);
                
                if ((incomingByte>47)&&(incomingByte<58)){//check if the incoming byte is (0-9, ASCII= 48-57)
                    int switchPin=incomingByte-48; //parse ASCII to integer
                    if ((switchPin>=ledStartPin)&&(switchPin<=ledStartPin+totalPins)){
                      pinState[switchPin-ledStartPin]*=-1; //toggle pin state
                    }
                }  
                Serial.flush();
	}
}

void sendSerialComm(){
    Serial.print("===================:");
    for (int i=0; i<totalPins; i++){
      Serial.print(":pinState");
      Serial.print(i);
      Serial.print(":");      
      Serial.print(pinState[i]);            
    }    
    Serial.println(":;");
    Serial.flush();
//    delay(1);
}

void setPins(){
  for (int i=0; i<totalPins; i++){
    if(pinState[i]==-1){
      digitalWrite(i+ledStartPin, LOW);
    }else{
      digitalWrite(i+ledStartPin, HIGH);      
    }
  }
}