Chief Delphi - cRIO FRC_RobotTask error

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cRIO FRC_RobotTask error

Hey guys. I don't have much time before my competition and I just got this error from the NetConsole;

0x28bffe8 (FRC_RobotTask): task 0x28bffe8 has had a failure and has stopped.

A search brings up no hits. Does anybody have any idea about what causes this task error and what I can do to solve this?

Will post code if necessary.
Quick replies would be lovely.

EDIT:
Got rid of my Initial error by fixing up my pointers, however I now get a new error upon clicking 'Enable' on the driver station:

0x28c00e0 (FRC_RobotTask): task 0x28c00e0 has had a failure and has stopped.
0x28c00e0 (FRC_RobotTask): fatal kernel task-level exception!

Again, help is much appreciated.

Re: cRIO FRC_RobotTask error

I saw an issue in Orlando where we were trying to gather input from the Analog Input on the DS Software. Sometimes, it returned a null and caused a null-pointer exception. I can't say if that is your issue but it is possible. Thanks to Andrew Schreiber for helping me track that bug down.

Re: cRIO FRC_RobotTask error

Thanks Bharat. I'm currently going through looking for a similar issue. Figured it must be a an improper pointer assignment, so I'm scouring through the lines hehe. Glad to know I'm on the right track.

Re: cRIO FRC_RobotTask error

I agree - most likely the use of a null pointer. As a general rule of C/C++ programming, this is a MUST -- check all pointers before using them. **ALSO** if you 'delete' a pointer, set that pointer to NULL afterwards as well. The programming is a little more 'verbose', but it is SAFER. Crashing in a real-time robot is the PITS.

For instance: (Writing a sample that should be rather 'real' but is from memory so may come with issues...this is intended to show the use of pointer checking -- not syntax and running code)

Code:

ColorImage* pImage;

pImage = NULL;

AxisCamera& cam=AxisCamera::GetInstance();

BinaryImage* pBin;

pBin = NULL;



while(IsOperatorControl())

{

  if (cam.IsFreshImage())

  {

    pImage = cam.GetImage();

    if (pImage)

    {

      pBin = pImage->ThresholdHSL(x,y,z,zz,p,d,NULL);

      if (pBin)

      {

        // Do something using pBin like particle report ...

      }

      else

        printf("ERROR: ThresholdHSL() failed.\n");

    }

    else

      printf("ERROR: GetImage() failed.\n");



    // Done with the image -- must dispose of it.

    // But *SHOULD* also reset it to NULL so it doesn't get used accidentally.

    if (pImage)

    {

      delete pImage;

      pImage = NULL;

    }



    // Done with the image -- must dispose of it.

    // But *SHOULD* also reset it to NULL so it doesn't get used accidentally.

    if (pBin)

    {

      delete pBin;

      pBin = NULL;

    }

  }

}