[CS411X] How do I drive a serial line-based controller? Part2

Dr. Douglas Lyon ( lyon@snet.net)

Fri, 18 Sep 1998 07:44:28 -0500

In my last e-mail on this

subject...I realized that:

String s = "M,0,0,0,0,0,0,7,0,0";

could be:

String s = "M,0,0,0,0,0,0,7,0,0\r\f";

byte b[] = s.getBytes();

Should be enough!

Check the value of the last two bytes by writing

them as int values to the console...is it 13 and 10?

- DL

To formulate a string+ control

characters to an embedded controller, you need to formulate

to different byte arrays and concatenate them.

byte [] st={'M',0,0,0,0,0,0,7,0,0,13,10}; // have

Should be:

String s = "M,0,0,0,0,0,0,7,0,0";

byte b[] = s.getBytes();

byte eb[] = {13,10};

byte turnBytes[] = new byte[b.length+eb.length];

int i=0;

for (; i < b.length; i++) {

turnBytes [i]=b[i];

}

turnBytes[i]=eb[0];

turnBytes[i+1]=eb[1];

now write out the turnBytes....

Got it?

- DL

Hi!

Here is my code.

If you can solve the problem, send me a email.

-Hak Kywn Roh

// Hak Kywn Roh (0367641)

// CPE388X

// Assignment #1

import java.io.*;

import java.util.*;

import javax.comm.*;

public class TurnTable

{

static Enumeration portList;

static CommPortIdentifier portId;

static SerialPort serialPort;

static OutputStream outputStream;

public static void main(String[] args)

{

TurnTable tt=new TurnTable();

System.out.println("getPortIdentifiers...");

portList=CommPortIdentifier.getPortIdentifiers();

System.out.println("getPortIdentifiers... done!");

while (portList.hasMoreElements())

{

portId=(CommPortIdentifier)portList.nextElement();

if

(portId.getPortType()==CommPortIdentifier.PORT_SERIAL)

{

if (portId.getName().equals("COM3"))

{

System.out.println("portId="+portId.getName());

try

{

serialPort=(SerialPort)portId.open("SimpleWriteApp", 2000);

System.out.println("Port

Open");

}

catch (PortInUseException e)

{

System.out.println(e.currentOwner+" owned this port");

System.out.println("Will

try to close");

serialPort.close();

}

try

{

outputStream=serialPort.getOutputStream();

}

catch (IOException e)

{

System.out.println("Could

not get output Stream:"+e);

}

try

{

serialPort.setSerialPortParams(9600,SerialPort.DATABITS_8,

SerialPort.STOPBITS_2, SerialPort.PARITY_NONE);

}

catch

(UnsupportedCommOperationException e)

{

System.out.println("Set

Serial Port Params :"+e);

}

try

{

byte [] mn={27, 13, 27, 13, 27, 13, 0};

outputStream.write(mn);

System.out.println("Send

magic number..");

}

catch (IOException e)

{

System.out.println(e);

}

sleepSec(10);

try

{

byte [] st={'M',0,0,0,0,0,0,7,0,0,13,10}; // have

to change this line...

outputStream.write(st);

System.out.println("Move

step.");

}

catch (IOException e)

{

System.out.println(e);

}

//tt.step(1);

//sleepSec(2);

//tt.step(2);

//sleepSec(2);

//tt.step(3);

//sleepSec(2);

serialPort.close();

System.out.println("port closed");

try {

System.in.read();

} catch (java.io.IOException e) {}

}

}

}

}

public void step(int n)

{

System.out.println("Move "+n+" steps");

byte [] st={'M',0,0,0,0,0,0,7,0,0,13,10};

for (int i=0;i<n;i++)

try

{

outputStream.write(st);

}

catch (IOException e)

{

System.out.println(e);

}

}

public static void sleepSec(int sec)

{

try

{

Thread.sleep(sec*1000);

}

catch (InterruptedException e) {}

}

}

Also try:

http://www.ferrettronics.com