Originally Posted by kmrchiefdelphi (Post 1630189)

Hi, after installing the latest navx_mxp jar file we are getting the following errors during deploy. We followed the Java coding steps from the Kauai Labs website. Any suggestions would be welcomed.

Thanks in advance.

[javac] RobotMap.java:3: error: package com.kauailabs.navx.frc does not exist
[javac] import com.kauailabs.navx.frc.AHRS;
[javac] ^
[javac] RobotMap.java:23: error: cannot find symbol
[javac] AHRS x = new AHRS(SerialPort.Port.kMXP);
[javac] ^
[javac] symbol: class AHRS
[javac] location: class RobotMap
[javac] RobotMap.java:23: error: cannot find symbol
[javac] AHRS x = new AHRS(SerialPort.Port.kMXP);
[javac] ^
[javac] symbol: class AHRS
[javac] location: class RobotMap
[javac] 3 errors

Originally Posted by madz (Post 1629052)

Are there any FRC Java examples for turning to or driving on a heading with a tank drive like there are for FTC? The FRC examples all seem to be for a mecanum drive. Thanks!

Originally Posted by slibert (Post 1630675)

The info you sent suggests that Eclipse can't locate the navx_frc.jar file (the navX-MXP RoboRIO Java Library).

For 2017, the location of the navX-MXP RoboRIO Java Library has changed, to match the new standard defined by the WPI Library for 3rd-party libraries.

This new location is:

C:\Users\<username>\wpilib\user\java\lib

This actually makes things simpler to configure in Eclipse than in previous years, but it involves a change to the Eclipse library paths.

Please review the RoboRIO Java Library instructions for Configuring Eclipse Library Paths, which have been recently updated to reflect this new location.

Originally Posted by slibert (Post 1630724)

If Kauai Labs creates a Java tank drive "straight-line driving" example using the WPI Library RobotDrive class, would your team be able to spend some time testing it? I realize everyone's busy right now...

Originally Posted by madz (Post 1635990)

We are trying to get this to work right now, but are running into build problems

Originally Posted by madz (Post 1636074)

OK, we think there is an issue on this particular computer's eclipse. We were able to get it to compile on another computer (after refresh/clean/rebuild) but not on our main computer. It's really weird.

We'd love to test the tank drive code, though. We have a test drivetrain wired and ready to go.

Originally Posted by slibert (Post 1636104)

Glad to hear you've worked around the configuration problem. Now, let's work together on the tank drive code, and discuss what it exactly you'd like to accomplish.

With your tank drive system, is it your goal to:

- when stopped, rotate the robot to point to a particular angle?

- or -

- when moving, continue driving in a straight line?

Originally Posted by madz (Post 1636120)

Thanks for offering to help! It's actually both.

We're using a naxX micro for our FTC robot so are familiar with the FTC examples (we have a consistent 100 point autonomous in FTC). We are just trying to translate that into FRC where we have much less experience.

So, for instance, we may:

(1) drive on a heading for X encoder ticks
(2) stop, and turn in place
(3a) drive on a heading for X more encoder ticks AND/OR
(3b) drive using vision tracking for X more encoder ticks

Originally Posted by inform880 (Post 1637280)

Hi,

I'm using Labview (updated), and have just installed the library, but it can't find this file:

Any ideas on what's wrong?

Originally Posted by aeastet (Post 1638049)

I would try reinstalling the navX-AE library again. Something must have gone wrong with your install. Is that the only file that can not be found?

Originally Posted by inform880 (Post 1639840)

Sorry for the long delay, the SF2 stuff was put on hold while we had to work something else out, but now I'm back and remembered about the post. Yes, that is the only file missing, I installed it twice to try and work it out but it didn't fix it.

Originally Posted by slibert (Post 1637984)

Ok, there's now a FRC RoboRIO Java Tank-drive example demonstrating Rotate-to-Angle and Drive-straight techniques using navX-MXP, as well as zeroing the yaw.

Let us know how the testing goes.

- scott

Originally Posted by blturner (Post 1642438)

We tried to use the SF2 Labview samples yesterday for latency correction. The samples seem incomplete. The top level vision example does not seem to call to the lower level VIs. It makes reference to an Action Engine in the comments which I think is a replacement for global variables but I don't see where the needed stuff gets passed back and forth.

I was hoping to add shot while driving to our robot, but this all looks more complicated than we're going to be able to deal with in the next 2 weeks.

Sorry for being negative. But I am looking forward to SF2 in the future. I suspect that I have not found the right documentation.