Please Help

Cameron8160 · February 22, 2020, 4:27pm

I have been having trouble programming my drive train. If there out there that can walk me through programming drive train.

Thanks,

Cameron Richardson, 8160

Phone 7089049367

GitHub

sargeanthost · February 22, 2020, 4:03pm

What kind of problems?

Cameron8160 · February 22, 2020, 4:05pm

I get errors sometimes it stops the motor doesn’t move and i get emergency stopped .

Waz · February 22, 2020, 4:10pm

Could you share a link to your code in GitHub or somewhere similar?

Mark_McLeod · February 22, 2020, 4:27pm

Emergency Stopped happens when you hit the PC’s space bar.
Buttons to avoid or be aware of on your PC while the Driver Station is running:

Space bar - estop (robot power must be cycled to restore operation)
Enter key - Disable robot
[]\ all at once - Enable Robot

Cameron8160 · February 22, 2020, 4:27pm

Waz · February 22, 2020, 5:10pm

I am not sure why it is not moving, however, there are a number of non-standard constructs in your code that could be throwing me off. Here are a few suggestions if you are still having issues after considering Mark’s post.

First, the change the motor controller and TankDrive method static declarations in Drivesubsystem to non-static.

Second, remove the setDefualtcomand method from Drivesubsystem. You are getting default command set because this is misspelled. If someone fixes the spelling, its implementation that does nothing is going to cause you mysterious grief.

Third, in RobotContainer change line 35 to:

DriveSub.setDefaultCommand(new RunCommand(() -> DriveSub.TankDrive(joy.getRawAxis(1), joy.getRawAxis(5)), DriveSub));

Cameron8160 · February 22, 2020, 5:19pm

I did all of that its giving me this error

ERROR 1 Unhandled exception: java.lang.NullPointerException java.base/java.util.Objects.requireNonNull(Unknown Source)
ERROR 1 The startCompetition() method (or methods called by it) should have handled the exception above. edu.wpi.first.wpilibj.RobotBase.runRobot(RobotBase.java:293)
Warning at edu.wpi.first.wpilibj.RobotBase.runRobot(RobotBase.java:291): Robots should not quit, but yours did!

Amicus1 · February 22, 2020, 5:22pm

It means you are passing a null object somewhere. I can’t tell where though.

Cameron8160 · February 22, 2020, 5:36pm

Yea looked through the whole thing and still cant find it

Amicus1 · February 22, 2020, 6:00pm

Found it:

github.com

cameron30560/Kyle305/blob/5d98f1e33f6db7bc3018c090c68bcedd5e9a6f41/RobotContainer.java#L27




/**
 * This class is where the bulk of the robot should be declared. Since
 * Command-based is a "declarative" paradigm, very little robot logic should
 * actually be handled in the {@link Robot} periodic methods (other than the
 * scheduler calls). Instead, the structure of the robot (including subsystems,
 * commands, and button mappings) should be declared here.
 */
public class RobotContainer {
  private ExampleSubsystem m_exampleSubsystem;
  private final ExampleCommand m_autoCommand = new ExampleCommand(m_exampleSubsystem);
public static Drivesubsystem DriveSub = new Drivesubsystem();
public static XboxController joy = new XboxController(0);


  /**
   * The container for the robot.  Contains subsystems, OI devices, and commands.
   */
  public RobotContainer() {
   DriveSub.setDefaultCommand(new RunCommand(() -> Drivesubsystem.TankDrive(joy.getRawAxis(1), joy.getRawAxis(5)), DriveSub));
    // Configure the button bindings
    configureButtonBindings();

You need to change this to drive sub or instantiate example subsystem.

Cameron8160 · February 22, 2020, 6:05pm

how i dont understand

Waz · February 22, 2020, 6:41pm

Change line 26 to:

private ExampleSubsystem m_exampleSubsystem = new ExampleSubsystem();

If you get another exception like this that you want to ask about, please post the stack trace you see in the driver station log. It should point right to the failing line.

system · February 21, 2021, 6:52pm

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