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-   -   Defining/Setting a motor in Java (http://www.chiefdelphi.com/forums/showthread.php?t=141790)

JoelRummel 15-01-2016 15:52
Defining/Setting a motor in Java
 
I am trying to run a VERY SIMPLE piece of Java.
Its only goal is to set a motor's speed to 0.5.
Yet I have difficulties with even this simple task:
Code:
package org.usfirst.frc.team4855.robot;

import edu.wpi.first.wpilibj.IterativeRobot;
import edu.wpi.first.wpilibj.Talon;

public class Robot extends IterativeRobot {

        Talon talonMotor;

    public void robotInit() {

            talonMotor = new Talon(0);
           
    }

    public void teleopInit(){

            talonMotor.set(0.5);

    }
Not only does this not work but I get a whole bunch of crap in the driver station:

ERROR Unhandled exception: java.lang.RuntimeException: Code: -1029. HAL: Resource already allocated at [edu.wpi.first.wpilibj.hal.PWMJNI.allocatePWMChanne l(Native Method), edu.wpi.first.wpilibj.PWM.initPWM(PWM.java:117), edu.wpi.first.wpilibj.PWM.<init>(PWM.java:134), edu.wpi.first.wpilibj.SafePWM.<init>(SafePWM.java: 35), edu.wpi.first.wpilibj.Talon.<init>(Talon.java:51), org.usfirst.frc.team4855.robot.Robot.robotInit(Rob ot.java:31), edu.wpi.first.wpilibj.IterativeRobot.startCompetit ion(IterativeRobot.java:72), edu.wpi.first.wpilibj.RobotBase.main(RobotBase.jav a:241)]
WARNING: Robots don't quit!

Give it enough time and the robot will just reach an emergency stopped state without any apparent reason.

What in the world am I doing wrong

joelg236 15-01-2016 16:11
Re: Defining/Setting a motor in Java
 
First, the 50% code should be in teleopPeriodic, not init (so it keeps getting called over and over again).

Second, you're creating the talon at least twice. Your code isn't complete so I can't see where else it's being constructed.

JoelRummel 15-01-2016 16:18
Re: Defining/Setting a motor in Java
 
Thanks, put the code in teleopPeriodic.

I'm confused with your second point. The code I posted is all the code there is.

iSpotix 15-01-2016 17:37
Re: Defining/Setting a motor in Java
 
I have always written it in one line directly under the class statement not in robotinit.

Talon motor = new Talon(0);

Your problem may be from splitting it up.

rzoeller 15-01-2016 17:41
Re: Defining/Setting a motor in Java
 
Quote:
Originally Posted by iSpotix (Post 1524473)
I have always written it in one line directly under the class statement not in robotinit.

Talon motor = new Talon(0);

Your problem may be from splitting it up.
That shouldn't cause it, his motor reference would just be null prior to calling robotInit().

joelg236 16-01-2016 00:24
Re: Defining/Setting a motor in Java
 
The error stack shows Robot.java:31, meaning line 31. You don't have 31 lines posted in your thread.

And you're missing a curly brace to close the class. The above by itself wouldn't compile.

JoelRummel 16-01-2016 10:40
Re: Defining/Setting a motor in Java
 
That's because I had a bunch of blank space and comments that I got rid of when I copied and pasted the code here

I'm no longer getting errors in the console after moving to teleopPeriodic. But the motors still won't move.

I checked the motors earlier by hooking them up to our battery. They work fine...

pastelpony 16-01-2016 11:16
Re: Defining/Setting a motor in Java
 
I am having the same issue. I am trying to execute EXTREMELY basic code (operating a Victor). Yet, whenever I try to execute the code, nothing happens and my console gives no hints. Even the sample code does nothing to the robot right now. It successfully deploys yet does nothing.

JoelRummel 16-01-2016 11:45
Re: Defining/Setting a motor in Java
 
Nevermind. It was a stupid electrical error. I thought I had checked the system thoroughly but apparently I hadn't.

Thanks for letting me know it wasn't the code's fault.

joelg236 16-01-2016 12:17
Re: Defining/Setting a motor in Java
 
Quote:
Originally Posted by JoelRummel (Post 1524791)
Nevermind. It was a stupid electrical error. I thought I had checked the system thoroughly but apparently I hadn't.

Thanks for letting me know it wasn't the code's fault.
Always is :)


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