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Checking User Stack during runtime

Karl Kalchgruber

Hello,

i'd like to know how much space I need in the Userstack Area.
I'd cleard the UserStack-Section in start_v2.a66.
In my 'main.c' I'd like to have a function which shows me the Userstack. Therefore I have to know where the UserStack is located.

So how could I get access to ?C_USRSTKBOT & ?C_USRSTKTOP in 'main.c'? (I could look in the Memory Map & type in the numbers by hand, okay. But automaticaly it would be nice)

/Koarl

Parents
  • 0 in reply to Karl Kalchgruber

    Why don't you simply make stack top an bottom public in START_V2.a66:

    PUBLIC  stack_top
PUBLIC  stack_bottom

?C_USERSTACK    SECTION DATA PUBLIC 'SDATA'
?C_USRSTKBOT:
stack_bottom:
                DS      USTSZ    ; Size of User Stack
?C_USERSTKTOP:
stack_top:
?C_USERSTACK    ENDS

    And declare extern where you use them:

    extern unsigned int stack_top;
extern unsigned int stack_bottom;

    Sauli

Reply
  • 0 in reply to Karl Kalchgruber

    Why don't you simply make stack top an bottom public in START_V2.a66:

    PUBLIC  stack_top
PUBLIC  stack_bottom

?C_USERSTACK    SECTION DATA PUBLIC 'SDATA'
?C_USRSTKBOT:
stack_bottom:
                DS      USTSZ    ; Size of User Stack
?C_USERSTKTOP:
stack_top:
?C_USERSTACK    ENDS

    And declare extern where you use them:

    extern unsigned int stack_top;
extern unsigned int stack_bottom;

    Sauli

Children
  • 0 in reply to Sauli Porttila

    Hello Sauli,
    thank you for the tip it works!

    I'm not so familar with the assembler.

    Only for better understanding the hole thing, do you know why I cant get acces to the '?C_USRSTKBOT' Label? (which is in the original start_V2.a66 'public')

    /Koarl

  • 0 in reply to Karl Kalchgruber

    I guess it has something to do with the question mark in the label. You cannot have a question mark in any names in C code. There is a hint somewhere in the Keil application notes that you could use underscore in C code to reference a name containing a question mark, but trying to use _C_USRSTKBOT to access ?C_USRSTKBOT does not work. I am sure that Keil people could explain this if they wanted.

    Sauli