Command ataching issue

[yedidya03]

Hello,
While programming our robot I struggled with three problems I coud'nt solve that are all related to ataching commands to buttens/triggers and I wondered if it is all one problem.

In all three problems it did maneged to buid right but in the driver station I saw no robot code.

The first problem occurred when I tryed to define a command group and atach it to a button action.
The second problem was when I tryed to atach two commands to the same button (one to whileHeld and one to whenRelease).
The third problem was when I tryed to define a new Trigger to the throttel of the joystick and atach to it a command whenActive.

if someone knows what am I doing wrong it would be very helpfull.

[euhlmann]

If you could post a link to your code so we could read it, that would be helpful.

[yedidya03]

the first problem was when I added a command group to a button action.

the command group was :
public class DropAndCollect extends CommandGroup{

public DropAndCollect() {
// TODO Auto-generated constructor stub
addSequential(new DropAndCollect());
addSequential(new Collect());
}

}

the OI was :
public class OI {
public Joystick stick = new Joystick(0);
public Button[] btns = new Button[11];{
for (int i = 0; i < 11; i ++){
btns[i] = new JoystickButton(stick, i + 1);
}
}

public OI(){
btns[0].whileHeld(new DropAndCollect());
}
}

the second problem was when trying to have 2 commands at different actions of a button (in this case I also had no communication)

OI code :
public class OI {
public Joystick stick = new Joystick(0);
public Button[] btns = new Button[11];{
for (int i = 0; i < 11; i ++){
btns[i] = new JoystickButton(stick, i + 1);
}
}

public OI(){
btns[0].whenPressed(new DropCollector());
btns[0].whileHeld(new Collect());
}
}

the third problem was when I tried to define a trigger and run a command with it.

trigger code:
public class ThrottleTrigger extends Trigger{

@Override
public boolean get() {
// TODO Auto-generated method stub
return Robot.oi.stick.getThrottle() > 0;
}

}

OI code:
public class OI {
public Joystick stick = new Joystick(0);
public Button[] btns = new Button[11];{
for (int i = 0; i < 11; i ++){
btns[i] = new JoystickButton(stick, i + 1);
}
}
public ThrottleTrigger throttleTrigger = new ThrottleTrigger();

public OI(){
throttleTrigger.whenActive(new RaiseCollectorArm());
}
}

if someone knows why is that happening it will be very helpful.

[euhlmann]

At a glance I can't see anything wrong with your code, but here are some suggestions

- If you lost communications, check your connection to the robot. Communications aren't typically dependant on the presence of robot code (although robot code that crashes very quickly combined with auto-restart causes some problems in roboRIO responsiveness from experience)

- If your robot code is crashing very quickly for some reason, the driverstation usually doesn't have a chance to grab the log. Instead, open up an SSH session (with PuTTY on Windows and ssh on Linux, or whatever client you prefer) to "roborio-3211-frc.local" (default username is admin; password is blank [so hit enter directly on the prompt]) and use

tail -f /home/lvuser/FRC_UserProgram.log

This might allow you to catch some stack trace you're not seeing

- Try using the debugger. It will probably trigger a breakpoint on any error, so this might also allow you to see if anything's causing a crash

[Waz]

...
the command group was :
public class DropAndCollect extends CommandGroup{

public DropAndCollect() {
// TODO Auto-generated constructor stub
addSequential(new DropAndCollect());
addSequential(new Collect());
}

}
...


The first addSequential is using the wrong class. As you have it, it will result in an infinite loop creating many nested DropAndCollect instances.

Hope this helps,
Steve