// 2009 mlab.uiah.fi/paja
// Connecting to PC
// PC <-> Arduino with Messenger library

/*
 *** Protocal using Messenger Arduino library.
 Send following string from PC as a command. 
 Each string needs to end with carrige return (13 in ASCII)  
 
 - Read analog values: r a [a/d (pin)] [pin]
   (e.g. "r a d 7")
 - Read digital pins: r d [pin]
   (e.g. "r d 6")
 - Write digital pin: w d [pin] [value]
   (e.g. "w a 9")
 - Write analog pins: w a [pin] [value]
   (e.g. "w d 12")
*/

// download the library from following URL
// arduino.cc/playground/Code/Messenger
//
// Copy the library folder following location
// Arduino.app > (Show package contents) > 
// Contents > Resources > Java > hardware > libraries

// Inport Messenger library
#include <Messenger.h>
// Instantiate Messenger object with the default separator 
// (the space character)
Messenger message = Messenger();

///*** Import additional library if needed ***///
// #include <***.h>

///*** Main functions ***///
void setup(){
  // Start serial communication
  Serial.begin(9600);
    // Attach the callback function to the Messenger
  message.attach(messageReady);
  
  // Blink a Led three times when Arduino is ready to connect
  blinkLed();
  blinkLed();
  blinkLed();
}

void loop(){
  // The following line is the most effective way of using 
  // Serial and Messenger's callback
  while (Serial.available())  message.process(Serial.read () );
}

///*** Write functions to read sensors and write actuators ***///
int readPing(int pin){
  int input;
  pinMode(pin, OUTPUT);
  digitalWrite(pin, LOW);
  delayMicroseconds(2);
  digitalWrite(pin, HIGH);
  delayMicroseconds(5);
  digitalWrite(pin, LOW);
   
  pinMode(pin, INPUT);
  input = pulseIn(pin, HIGH);
  return input;
}

void writeAnalogLed(int pin, int value){
  pinMode(pin, OUTPUT);
  value = map(value, 0, 400, 0, 255);
  analogWrite(pin, value);
}

///*** Blinking a LED when you need to monitor ***///
void blinkLed(){
  int pin = 13;
  pinMode(pin, OUTPUT);
  digitalWrite(pin, HIGH);
  delay(100);
  digitalWrite(pin, LOW);
  delay(100);
}

///*** Reading incoming values ***///
void messageReady(){
  // Checks to see if the message is complete
  if (message.available()){
    // read first char
    switch (message.readChar()){
      case 'r':
        readValue();
        break;
      case 'w':
        writeValue();
        break;
    }
  }
}

void readValue(){
  int value;
  int pin;
  switch (message.readChar()){
    case 'd':
      // read boolean from digital pins
      pin = message.readInt();
      pinMode(pin, INPUT);
      value = digitalRead(pin);
      break;
    case 'a':
      switch (message.readChar()){
        // read integer from analog-in pins
        case 'a':
          pin = message.readInt();
          value = analogRead(pin);
          break;
        // read integer from digital pins
        case 'd':
          pin = message.readInt();
          switch (pin){
            case 0:
              // Write code here for the device connected to pin 0
              break;
            case 1:
              // Write code here for the device connected to pin 1
              break;
            case 2:
              // Write code here for the device connected to pin 2
              break;
            case 3:
              // Write code here for the device connected to pin 3
              break;
            case 4:
              // Write code here for the device connected to pin 4
              break;
            case 5:
              // Write code here for the device connected to pin 5
              break;
            case 6:
              // Write code here for the device connected to pin 6
              break;
            case 7:
              // Write code here for the device connected to pin 7
              value = readPing(pin);
              break;
            case 8:
              // Write code here for the device connected to pin 8
              break;
            case 9:
              // Write code here for the device connected to pin 9
              break;
            case 10:
              // Write code here for the device connected to pin 10
              break;
            case 11:
              // Write code here for the device connected to pin 11
              break;
            case 12:
              // Write code here for the device connected to pin 12
              break;
            case 13:
              // Write code here for the device connected to pin 13
              break;
          }
      }
  }
  // send the value to PC followed by linefeed.
  Serial.println(value);
}


///*** Writing outgoing values ***///
void writeValue(){
  int pin;
  int value;
  
  switch (message.readChar()){
    // write boolean to digital pins
    case 'd':
      pin = message.readInt();
      pinMode(pin, OUTPUT);
      value = message.readInt();
      digitalWrite(pin, value);
      break;
    // write integer to digital pins
    case 'a':
      pin = message.readInt();
      value = message.readInt();
      // Arduino NG (ATMEGA8 supports PWM only to pin 9, 10 and 11. 
      switch(pin){
        case 0:
          // Write code here for the device connected to pin 0 
          break;
        case 1:
          // Write code here for the device connected to pin 1
          break;
        case 2:
          // Write code here for the device connected to pin 2
          break;
        case 3:
          // Write code here for the device connected to pin 3
          break;
        case 4:
          // Write code here for the device connected to pin 4
          break;
        case 5:
          // Write code here for the device connected to pin 5
          break;
        case 6:
          // Write code here for the device connected to pin 6
          break;
        case 7:
          // Write code here for the device connected to pin 7
          break;
        case 8:
          // Write code here for the device connected to pin 8
          break;
        case 9:
          // Write code here for the device connected to pin 9
          // PWM pin
          writeAnalogLed(pin, value);
          break;
        case 10:
          // Write code here for the device connected to pin 10
          // PWM pin
          break;
        case 11:
          // Write code here for the device connected to pin 11
          // PWM pin
          break;
        case 12:
          // Write code here for the device connected to pin 12
          break;
        case 13:
          // Write code here for the device connected to pin 13
          break;
      }
  }
}