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Unread 03-03-2014, 01:37
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Aren Siekmeier Aren Siekmeier is offline
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Re: Serious bug identified in SmartDashboard/NetworkTables -- robot hangs

Quote:
Originally Posted by virtuald View Post
Unfortunately, I haven't been able to verify it on a cRio as I don't have access to one at the moment -- if any of you can do this, that would be great.
We've been working through this problem too, discussed in this thread. Here's what we've come up with so far:

Quote:
Originally Posted by compwiztobe View Post
We applied this patch, and rebuilt and redeployed our code. It appeared to improve the problem at first in that it gave the same FDIO errors as we saw previously, about as frequently as we had been getting the timeout errors, and we did not appear to be hanging. However (and we don't really understand what happened here), after a very short time, it started timing out immediately when enabled, giving the same error at line 117 of MotorSafetyHelper.cpp. One interesting thing to note is that when disabled all these errors stopped, so it seems to still be making it through the control loop in IterativeRobot.cpp (StartCompetition()). We have most of these error messages logged, so as soon as someone has access to those text files we will post those.

We have ported all of our code to Java and LabView, and neither of these implementations seem to show the same problem, though we hope to run the bot into the ground a little more over the next few days to tease any more errors out of it. Some C++ code that doesn't use Commands or the SmartDashboard/NetworkTables is in the works so testing that may also give some insight. We will probably stick with the Java implementation for the rest of the season.
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