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Collecting data from another class
Joined: 26 Apr 2004
Posts: 1
Collecting data from another class
Hi all,
I need some help here, I`m trying to take output data from a class using another
class.I`m a little bit confuse how to do it. Maybe someone can help me. I have
attached the source of the class that i want to take the data from.
Many thanks in advance.
Inge.
---------------------------------------------------------------
import javax.comm.*;
import java.io.*;
import java.awt.event.*;
import java.util.TooManyListenersException;
public class ADCConnection implements SerialPortEventListener {
private OutputStream os;
private InputStream is;
private CommPortIdentifier portId;
private SerialPort sPort;
private boolean open;
private StringBuffer inputBuffer;
private int[] analogValues, prevValues;
private int digitalValue;
public String s;
//channelConversion is a crazy little thing used to renumber the analog
values the ADC sends us
private final static int[] channelConversion={0, 2, 4, 6, 1, 3, 5, 7};
final static int jitterThreshhold=2; // used to compensate for noise from
ADC
// these are this things to change if for some reason the ADC changes
public final static String portName="COM1";
public final static int baudRate = 9600;
public final static int flowControlIn = SerialPort.FLOWCONTROL_NONE;
public final static int flowControlOut = SerialPort.FLOWCONTROL_NONE;
public final static int dataBits = SerialPort.DATABITS_8;
public final static int stopBits = SerialPort.STOPBITS_1;
public final static int parity = SerialPort.PARITY_NONE;
public ADCConnection()
{
analogValues=new int[8];
prevValues=new int[8];
for (int i=0; i<analogValues.length; i++) {
analogValues[i]=0;
prevValues[i]=0;
}
digitalValue=0;
inputBuffer=new StringBuffer(); // this is used in the input event handling
open = false;
}
public boolean openConnection() { // returns true on successful opening
// get CommPortIdentifier object for portName
try {
portId = CommPortIdentifier.getPortIdentifier(portName);
} catch (NoSuchPortException e) {
System.err.println(e.toString());
return false;
}
// Open the port -- give it a one second timeout
try {
sPort = (SerialPort)portId.open("SerialDemo", 1000);
} catch (PortInUseException e) {
System.err.println(e.toString());
return false;
}
// Set the parameters of the connection. If they won`t set, close the
// port before throwing an exception.
try {
sPort.setSerialPortParams(baudRate, dataBits, stopBits, parity);
sPort.setFlowControlMode(flowControlIn | flowControlOut);
} catch (UnsupportedCommOperationException e) {
sPort.close();
return false;
}
// Open the input and output streams for the connection. If they won`t
// open, close the port before throwing an exception.
try {
os = sPort.getOutputStream();
is = sPort.getInputStream();
} catch (IOException e) {
sPort.close();
System.err.println(e.toString());
return false;
}
// Add this object as an event listener for the serial port.
try {
sPort.addEventListener(this);
} catch (TooManyListenersException e) {
sPort.close();
System.err.println(e.toString());
return false;
}
// Set notifyOnDataAvailable to true to allow event driven input.
sPort.notifyOnDataAvailable(true);
try {
sPort.enableReceiveTimeout(30);
} catch (UnsupportedCommOperationException e) {
System.err.println(e.toString());
return false;
}
open = true;
return true;
}
public void closeConnection()
{
// If port is alread closed just return
if (!open) {
return;
}
// Check to make sure sPort has reference to avoid a NPE
if (sPort != null) {
try {
// close the i/o streams.
os.close();
is.close();
} catch (IOException e) {
System.err.println(e);
}
sPort.close();
}
open = false;
}
public boolean isOpen() {
return open;
}
public void poll() { // send the analog poll string (do nothing if not open
yet)
if (open)
{
try {
int delay=1; // don`t know why each command must be sent separately, but
that`s how it is
// the "UX" command ask for analog values
os.write("U8 ".getBytes());
os.flush();
Thread.sleep(delay);
os.write("U9 ".getBytes());
os.flush();
Thread.sleep(delay);
os.write("UA ".getBytes());
os.flush();
Thread.sleep(delay);
os.write("UB ".getBytes());
os.flush();
Thread.sleep(delay);
os.write("UC ".getBytes());
os.flush();
Thread.sleep(delay);
os.write("UD ".getBytes());
os.flush();
Thread.sleep(delay);
os.write("UE ".getBytes());
os.flush();
Thread.sleep(delay);
os.write("UF ".getBytes());
os.flush();
Thread.sleep(delay);
// "I" command gets digital state
os.write("I ".getBytes());
os.flush();
Thread.sleep(delay);
} catch (Exception e) {
System.out.println(e.toString());
}
}
}
public int[] getAnalogValues()
{
// fiddle w/ prevValues array to do some anti-jitter work
for (int i=0; i<analogValues.length; i++) {
if (Math.abs(analogValues[i]-prevValues[i])<=jitterThreshhold) {
analogValues[i]=prevValues[i];
} else {
prevValues[i]=analogValues[i];
}
}
return analogValues;
}
public int getDigitalValue()
{
return digitalValue;
}
public void serialEvent(SerialPortEvent e) {
int newData = 0;
if (e.getEventType()== SerialPortEvent.DATA_AVAILABLE) { // this is the only
event type we care about
// Read data until -1 is returned.
while (newData != -1) {
try {
newData = is.read();
if (newData == -1) {
break;
}
if (` ` == (char)newData) { // carriage return signals end of message
s=new String(inputBuffer); //output value ----> this is the output that
I want to take
inputBuffer = new StringBuffer(); // reset this for later
handleMessage(s); // decipher the message
} else { // keep storing incoming characters until
inputBuffer.append((char)newData);
}
} catch (IOException ex) {
System.err.println(ex);
return;
}
}
}
}
private void handleMessage(String s)
{
char command=s.charAt(0);
if (command == `U`)
{
int channel;
try {
channel=channelConversion[Integer.parseInt(s.substring(1,2), 16)-8];
} catch (Exception e) { // could be numberformat or arrayoutofbounds or
whoknows
channel=0;
System.out.println("problem interpretting channel value");
return; // don`t want to actually set any value if the ADC is sending back
junk
}
try
{
analogValues[channel]=Integer.parseInt(s.substring(2,4), 16); // only look
at first two hex digits of the value, the third is too noisy
} catch (NumberFormatException e)
{
System.out.println("trouble parsing analog value from ADC: "+s);
}
} else if (command == `I`)
{
try
{
digitalValue=Integer.parseInt(s.substring(1,3), 16);
} catch (NumberFormatException e)
{
System.out.println("trouble parsing digital value from ADC: "+s);
}
}
}
}
[Non-text portions of this message have been removed]
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