stamp.util.os.Event

bxgirten

Was the Event class removed from the stamp.util.os package? I was playing with JBotInterface and the compiler couldn't resolve the reference.

Peter Verkaik

Can't remember it ever had an Event class. Only Task and TaskManager classes.

Sure it isn't from another package?

regards peter

bxgirten

Where are my manners? Here's the sample JBot code:

bxgirten

Here's the exploded view of the source code:

package JBot;

import stamp.core.*;
import stamp.util.os.*;

/**
* J-Bot wheel control interface
* <p>
* Defines methods that J-Bot wheel control classes must provide.
*
* @version 2.1 03/12/03 Use new Task status support
* @version 2.0 12/12/02 Use Event synchronization
* @version 1.0 10/2/02
* @author Parallax Inc.
*/

public abstract class JBotInterface {
protected Event startEvent ;
protected Event nextEvent = Event.nullEvent ;
protected Event oneTimeEvent = Event.nullEvent ;

static final public int continuousForward = 32760 ;
static final public int continuousBackward = -32760 ;
static final public int continuousLeft = continuousForward ;
static final public int continuousRight = continuousBackward ;

/**
* Set Event that is to be notified when a movement starts.
*
* @param event Event to be notified when movement starts. Can be null.
*/
public JBotInterface ( Event event ) {
startEvent = Event.checkEvent(event);
}

/**
* Setup (current) task to wait for end of movement
*
* @param state next task state
*/
public void wait ( int state ) {
Task waitingTask = Task.getCurrentTask () ;
waitingTask.nextState ( state ) ;

if ( waitingTask.taskStatus()==Task.taskRunning) {
waitingTask.suspend () ;
oneTimeEvent = waitingTask ;
}
}

/**
* Set event to notify when movement is started. May be null.
*
* @param event Event to notify when movement is started
*
* @returns prior event
*/
public Event setStartEvent ( Event event ) {
Event resultEvent = startEvent ;
startEvent = Event.checkEvent(event) ;
return resultEvent ;
}

/**
* Set event to notify when movement is done. May be null.
*
* @param event Event to notify when movement is done
*
* @returns prior event
*/
public Event setNextEvent ( Event event ) {
Event resultEvent = nextEvent ;
nextEvent = Event.checkEvent(event) ;

// Prime the pump if necessary
if ( movementDone ()) {
causeNextEvent () ;
}

return resultEvent ;
}

/**
* Cause one time and next event.
* Normally called by the matching multitasking object.
*/
protected void causeNextEvent () {
// Notify event that the next movement can be started
nextEvent.notify ( this ) ;

// Notify event that the next movement can be started
oneTimeEvent.notify ( this ) ;
oneTimeEvent = Event.nullEvent ;
}

/**
* This method should be called at the beginning of a movement method.
*/
protected void startMovement () {
startEvent.notify (this) ;
}

/**
* Check if movement is done. This should be called until it
* returns true.
*
* @returns true if done waiting for movement
*/
public abstract boolean movementDone () ;

/**
* Stop movement.
*/
public void stop () {
move ( 0 ) ;
}

/**
* Set wheel speed to move forward/backward (negative).
*
* @param inches number of inches to move
*/
public abstract void move ( int inches ) ;

/**
* Set wheel speed to pivot left (positive) or right (negative).
*
* @param steps number of steps to turn
*/
public abstract void pivot ( int steps ) ;

/**
* Turn left (positive) or right (negative).
*
* @param steps number of steps to turn
*/
public abstract void turn ( int steps ) ;
}

Peter Verkaik

Go here

http://www.parallax.com/javelin/javelinbot.asp

It says:

JavelinBot robot is a manuscript with Boe-Bot® robot projects designed for use the Javelin Stamp™ module. JavelinBot files (manuscript, program listings, and a revised stamp.util.os package (in the Javelin App Guide) are available for downloading below.

regards peter

bxgirten

Thanks, Peter. I was about to embark on writing the missing class(es) so you saved me some time

-Bill

diafysal

How come the "revised stamp.util.os package" are not on this site:
http://www.parallax.com/javelin/doc/index.html
?

Post Edited (diafysal) : 7/25/2005 10:21:52 PM GMT

Peck

I too am having trouble using the classes in teh JBot package due to an incomplete Task or Event class. Do you think you can help me?

Thanks in advance, Peck

Peter Verkaik

I attached a copy of the revised os.
It also includes a class SimpleTask (and extended classes FlashLed, CheckPin, CheckPin_and_FlashLed)
which are classes of my own that are much simpler than the Task class.

regards peter