problem with buffer in serial connection

danielle_nl

Hi all, I've been trying for hours to get a serial connection to my decibel meter to work in processing. It works with my old Basic Stamp setup but now I want to use it in Processing and I'm trying to translate the script. I do get some sensible data but after a while the I get an index out of bounds error. Here's the script: import processing.serial.*;

Serial myPort;  // Create object from Serial class
int baudrate = 9600;
int delayTime = 3000;
byte regel1[] = new byte[8];
byte regel2[] = new byte[8];
byte regel3[] = new byte[8];
int db = 0;
int maxRange = 1300;
int minRange = 300;
//int oldMillis = 0;

void setup(){
  size(200, 200);
  String portName = Serial.list()[1];
  println(Serial.list());
  myPort = new Serial(this, portName, baudrate,'N',8,1);
}
void draw(){
  regel1[0] = byte(2);
  regel1[1] = byte('K'); 
  regel1[2] = byte(0);
  regel1[3] = byte(0);
  regel1[4] = byte(0);
  regel1[5] = byte(0);
  regel1[6] = byte(0);
  regel1[7] = byte(3);
  regel2[0] = byte(2);
  regel2[1] = byte('a');
  regel2[2] = byte('0');
  regel2[3] = byte('0');
  regel2[4] = byte('0');
  regel2[5] = byte('0');
  regel2[6] = byte('0');
  regel2[7] = byte(3); 
  regel3[0] = byte(2);
  regel3[1] = byte('X');
  regel3[2] = byte('0');
  regel3[3] = byte('0');
  regel3[4] = byte('0');
  regel3[5] = byte('0');
  regel3[6] = byte('0');
  regel3[7] = byte(3);
  myPort.write(regel1);
  myDelay(50);
  while (myPort.available() > 0) {
    println("available");  
    byte[] smallBuffer = new byte[4];
    smallBuffer = myPort.readBytes();
    myPort.write(regel2);
    myDelay(50);
    myPort.write(regel3);
    myDelay(50);
    byte[] inBuffer = new byte[15]; //15
    for(int i = 0; i < inBuffer.length; i++){
      inBuffer[i] = 0;
    }
    inBuffer = myPort.readBytes();
    if (inBuffer != null && inBuffer[3] != 0 && inBuffer[4] != 0){ 
      db = inBuffer[3]*256 + inBuffer[4];
        if(db > minRange && db < maxRange){
          println("db: "+db);
          //print(" t: ");
          //println(millis()-oldMillis);
          //oldMillis = millis();
        }
    }
    myDelay(2850);
  }
}

void myDelay(int ms)
{
   try
  {    
    Thread.sleep(ms);
  }
  catch(Exception e){}
}

As you can see I've filled the buffer with zero's to make sure there's something inside. I then check for index 3 and 4 (because I'm doing calculations on it). But I still get an index out of bounds on this line: if (inBuffer != null && inBuffer[3] != 0 && inBuffer[4] != 0) As the reported decibel level is sometimes incorrect I suspect the buffer to not have cleared of filled completely. I hope someone can point me in the right direction here.

Thanks very much in advance for your help, danielle.