Fill stack with a pre-defined value

Christian,

I am not clear on what you are looking to do.  Is this for development so that you can determine how large a stack you need to allocate in the code project?  If so, then you can just use CCS to fill the stack memory before you run the program.  Are you looking to do this each and every time you run your code, and maybe check the end of the stack periodically in your code to see how much is left?  If that is the case, then you need to fill the stack at runtime.  The assembly code you cited will not actually fill the stack at runtime.  It fills the stack at LOADTIME (when CCS loads the program).  To fill the stack at runtime, you'd need to write actual assembly instructions that stores the desired value to the stack in a loop.  The code you showed above is not really code.  It is a bunch of assembler directives.

Regards,

David

Hello Christian,

you do not have to write any assembly code, see the following function:

#define STACK_PATTERN (0xAAAAu)

uint16_t *globalIterator;

void stackInit(void)
{
  uint16_t topOfStack;

  globalIterator = &topOfStack;
  while(globalIterator < &vStackEnd)
  {
    *globalIterator = STACK_PATTERN;
    globalIterator++;
  }
}

This function defines a variable topOfStack, which will be placed on top of the stack (it cannot be assigned to any register, because we are using a pointer to this variable - and a register doesn't have any address). The symbol vStackEnd is generated by linker (see RUN_END operator in SPRU513) and its address is the last address of the stack.

I hope this helps, regards,

  Jan

Hello Jan,

Thank you for this suggestion. I think this would require a "pre-loader" programme written in C-code which after executing your code jumps to the actual programme. If not, you will corrupt the stack as it is in use while running your C-code?

Best regards,

Christian

Thank you Jan, and thank you David,

That's two very good solutions!

Best regards,

Christian