Electronic + Coding 2

Serial Communication: Arduino-Processing

Arduino-Code
#include "serialComLib.h"

// ----------------------------------------------------------------------------
// cmdId constants
#define   CMD_WRITE_DOUT2   1
#define   CMD_READ_DIN3     2
#define   CMD_READ_AD0      3
#define   CMD_RET_READ_DIN3 4
#define   CMD_RET_READ_AD0  5

// ----------------------------------------------------------------------------
// global var

SerialComLib   comLib;

unsigned char  din;

unsigned char  digitalOutPin = 2;
unsigned char  digitalInPin = 3;
unsigned char  analogPin = 0;

void setup()
{
  pinMode(digitalOutPin, OUTPUT);
  pinMode(digitalInPin, INPUT);

  digitalWrite(digitalOutPin, LOW);

  comLib.open(Serial,9600);
}

unsigned char data[] = {11,22};

void loop()
{
  if(comLib.readPacket() == SerialComLib::Ok)
  { // there is some data on the serial port

    // interprete the command
    switch(comLib.getCmd())
    {
    case CMD_WRITE_DOUT2:
      // set the digital out 2
      digitalWrite(digitalOutPin, comLib.getByte() > 0 ? HIGH : LOW);
      break;

    case CMD_READ_DIN3:
      // read in the digtial input 3
      comLib.beginSend(CMD_RET_READ_DIN3);
        comLib.sendByte(digitalRead(digitalInPin));
      comLib.endSend();
      break;

    case CMD_READ_AD0:
      // read in the anolog input 0
      comLib.beginSend(CMD_RET_READ_AD0);
        comLib.sendInt(analogRead(analogPin));
      comLib.endSend();
      break;
    default:
      // unknown cmd
      break;
    }
  }
  else
  {  // do something else ???

  }

}

Download Arduino Code
Processing Code
import processing.serial.*;

final static byte CMD_WRITE_DOUT2  = 1;
final static byte CMD_READ_DIN3    = 2;
final static byte CMD_READ_AD0     = 3;
final static byte CMD_RET_READ_DIN3= 4;
final static byte CMD_RET_READ_AD0 = 5;

SerialComLib  serialComLib;

void setup()
{
  size(500,400);

  println("Serial Ports:");
  println(Serial.list());

  String portName = Serial.list()[0];

  serialComLib = new SerialComLib(this, portName, 9600);
}

void draw()
{
  background(255); 

  serialComLib.update();
}

void keyPressed()
{
  switch(key)
  {
  case '1':
    println("Send read DIN3");
    serialComLib.beginSend(CMD_READ_DIN3);
    serialComLib.endSend();
    break;
  case '2':
    println("Send read AD0");
    serialComLib.beginSend(CMD_READ_AD0);
    serialComLib.endSend();
    break;
  case '3':
    println("Send write DOUT2 low");
    serialComLib.beginSend(CMD_WRITE_DOUT2);
      serialComLib.sendByte(0);
    serialComLib.endSend();
    break;
  case '4':
    println("Send write DOUT2 high");
    serialComLib.beginSend(CMD_WRITE_DOUT2);
      serialComLib.sendByte(1);
    serialComLib.endSend();
    break;
  }
}

void onReceiveSerialCom(int cmdId,SerialComLib serialCom)
{
  switch(cmdId)
  {
  case CMD_RET_READ_DIN3:
    println("DIN3: " + serialCom.getByte());
    // get din3
    break;
  case CMD_RET_READ_AD0:
    // get ad0
    println("AD0: " + serialCom.getUShort());
    break;
  default:
    println("Unknown command: " + cmdId);
    break;
  }
}


Download Processing Code