No Robot Code on the RoboRIO

Technical Programming
1

We are still using the 2015 Control System and all the code from last year. We haven’t updated WPILib. When I load the code to the robot, this is the log:

Trying to override old definition of task classloader
clean:
   [delete] Deleting directory /Users/Nashoba/Programming/2016-Pre-Season-Drivetrain/build
   [delete] Deleting directory /Users/Nashoba/Programming/2016-Pre-Season-Drivetrain/dist
compile:
    [mkdir] Created dir: /Users/Nashoba/Programming/2016-Pre-Season-Drivetrain/build
     [echo] [athena-compile] Compiling src with classpath=/Users/Nashoba/wpilib/java/current/lib/WPILib.jar:/Users/Nashoba/wpilib/java/current/lib/NetworkTables.jar to build
    [javac] Compiling 22 source files to /Users/Nashoba/Programming/2016-Pre-Season-Drivetrain/build
jar:
     [echo] [athena-jar] Making jar dist/FRCUserProgram.jar.
    [mkdir] Created dir: /Users/Nashoba/Programming/2016-Pre-Season-Drivetrain/dist
    [mkdir] Created dir: /Users/Nashoba/Programming/2016-Pre-Season-Drivetrain/build/jars
     [echo] [athena-jar] Copying jars from /Users/Nashoba/wpilib/java/current/lib/WPILib.jar:/Users/Nashoba/wpilib/java/current/lib/NetworkTables.jar to build/jars.
     [copy] Copying 2 files to /Users/Nashoba/Programming/2016-Pre-Season-Drivetrain/build/jars
      [jar] Building jar: /Users/Nashob/Programming/2016-Pre-Season-Drivetrain/dist/FRCUserProgram.jar
get-target-ip:
     [echo] Trying Target: roboRIO-1768.local
     [echo] roboRIO found via mDNS
dependencies:
     [echo] roboRIO image version validated
     [echo] Checking for JRE. If this fails install the JRE using these instructions: https://wpilib.screenstepslive.com/s/4485/m/13503/l/288822-installing-java-8-on-the-roborio-using-the-frc-roborio-java-installer-java-only
  [sshexec] Connecting to roboRIO-1768.local:22
  [sshexec] cmd : test -d /usr/local/frc/JRE
deploy:
     [echo] [athena-deploy] Copying code over.
      [scp] Connecting to roboRIO-1768.local:22
      [scp] done.
  [sshexec] Connecting to roboRIO-1768.local:22
  [sshexec] cmd : killall netconsole-host
      [scp] Connecting to roboRIO-1768.local:22
      [scp] done.
      [scp] Connecting to roboRIO-1768.local:22
      [scp] done.
     [echo] [athena-deploy] Starting program.
  [sshexec] Connecting to roboRIO-1768.local:22
  [sshexec] cmd : . /etc/profile.d/natinst-path.sh; /usr/local/frc/bin/frcKillRobot.sh -t -r;
  [sshexec] start-stop-daemon: warning: killing process 1761: No such process
BUILD SUCCESSFUL
Total time: 11 seconds

However, the Comm light on the RoboRIO is red (indicating no code) and the Driver Station says there is no code on the robot.

2

Looks like your code is erroring out. Can you post a riolog dump as well? and the driver station error log if there is any content there.

3

There is no driver station error log. How do I find the roborio log?

4

Instructions for opening Riolog are available on ScreenSteps here: http://wpilib.screenstepslive.com/s/4485/m/13809/l/284333-viewing-console-output. Instructions are about halfway down the page.

5

The only thing that the Riolog says is

➔ Launching «'/usr/local/frc/JRE/bin/java' '-jar' '/home/lvuser/FRCUserProgram.jar'»
6

Okay, by commenting out code, I’ve narrowed it down to

for(; i*maxAcc < maxSpeed; i += 0.01) {}

being the issue.

This happens because maxAcc = 0, since I hadn’t found the value yet… Oops.

Thanks for the help at narrowing it down to being a code issue.