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RTOS/TM4C1294NCPDT: Stack overflow occurs in TM4C1294 Tiva C series EVM

Manohar B
Intellectual 610 points
Part Number: TM4C1294NCPDT

Tool/software: TI-RTOS

Hi,

During execution of my application, Often I am getting the below error,

l.Task: line 383: E_spOutOfBounds: Task 0x200028dc stack error, SP = 0x20000ce4.
xdc.runtime.Error.raise: terminating execution

I am using almost 9 task with each task having 512Kb stack size. I have used 4 event handler and 4 mailbox.

Question:

1.Do I need to increase the stack size of each task? or the system stack

2.What is the default system stack size? Where I can find the system stack increase option in CCS .cfg file.

3., it's throwing memory error, When I increase event handler or mailbox. Is there any option to increase memory buffer for mailbox.

Regards,

Manohar

  • 0
    Guru 27665 points

    Manohar B said:
    I am using almost 9 task with each task having 512Kb stack size.

    I don't think this is possible. There's not that much memory on the chip and the Launchpad doesn't add memory.

    Robert

  • 0 in reply to Robert Adsett
    Intellectual 610 points
    Hi,
    Thanks Robert

    Actually the Stack size for each task is 512 bytes only, So 4Kb of memory only its taking.
    Then why its showing the error?

    l.Task: line 383: E_spOutOfBounds: Task 0x200028dc stack error, SP = 0x20000ce4.
    xdc.runtime.Error.raise: terminating execution

    Please suggest any optimaization can be done or stack size can be increased.

    Note: In our task there is no local variables, no recursive calls and no arrays declared.


    Regards,
    Manohar
  • 0 in reply to Manohar B
    Guru 27665 points

    Manohar B said:
    Then why its showing the error?

    Because q is 32? Seriously, how are we to know?

    Manohar B said:
    Note: In our task there is no local variables, no recursive calls and no arrays declared.

    RTOS calls? library calls?

    How have you determined the appropriate size for you stacks?

    Manohar B said:
    l.Task: line 383: E_spOutOfBounds: Task 0x200028dc stack error, SP = 0x20000ce4.

    Note, your error is telling you which task and stack are failing

    Robert

  • 0 in reply to Robert Adsett
    Intellectual 610 points
    Hi Robert,

    1. Because q is 32? Seriously, how are we to know?
    I am not getting this question.

    2.How have you determined the appropriate size for you stacks?
    I am just using default Stack memory size that is mentioned when I create a task in .cfg GUI.


    3.Note, your error is telling you which task and stack are failing
    How can I find which task and stack is failing using the task address, do you have any idea on how we can find it in CSS?


    Regards,
    Manohar
  • 0 in reply to Manohar B
    Guru 27665 points

    Manohar B said:

    1. Because q is 32? Seriously, how are we to know?
    I am not getting this question.

    I was making the observation that we have no insight into why you might have a stack problem. We have no idea how your application is structured or what your tasks do. I was flippantly suggesting that the reason your stack was overflowing was because you had set q to 32. That's as good a suggestion as any given the information we have.

    Manohar B said:
    2.How have you determined the appropriate size for you stacks?
    I am just using default Stack memory size that is mentioned when I create a task in .cfg GUI.

    So now you have your first task. determine what size your stacks need to be.

    Manohar B said:
    3.Note, your error is telling you which task and stack are failing
    How can I find which task and stack is failing using the task address

    Back track from the address information given.

    Manohar B said:
    , do you have any idea on how we can find it in CSS?

    Not the foggiest, but it should be possible to produce a map. Although I presume you mean CCS, otherwise I have even less of an idea.

    Robert

  • 0 in reply to Robert Adsett
    Intellectual 610 points

    Hi,

    Thank you Robert

    I have found that the above error is because of Idle task with the address in the Error.

    And I have gradually increased the idle task stack size from 512 to 2048. Since I am getting the same error.

    Question:

    1.I want to know how to resolve this error, its not getting resolved even if I increase the stack size of idle task.

    2. Any other approach to resolve this issue?

    Regards,

    Manohar