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Hello everybody,
I have a doubt about stack in DSP/BIOS tasks.
In fact I'm currently using a DM642 based platform and I have these doubts:
1)    the stack size of task seems to be limited to about 32 KB. Is this correct? Why is used
this threshold?
2)    how is allocated the stack? It seems that there is some hole in stack, but I don't know
which alignment strategies are adopted by the DSP/BIOS. 
Is there someone that can provide me some more info and may be some document that explain these
concerns?
Thanks a lot Gio

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Hello, Gio

--- Giovanni Parodi <g...@yahoo.it> wrote:

> Hello everybody,
> I have a doubt about stack in DSP/BIOS tasks.
> In fact I'm currently using a DM642 based platform
> and I have these doubts:
> 1)    the stack size of task seems to be limited to
> about 32 KB. Is this correct? Why is used this
> threshold?
> 2)    how is allocated the stack? It seems that
> there is some hole in stack, but I don't know which
> alignment strategies are adopted by the DSP/BIOS. 
> Is there someone that can provide me some more info
> and may be some document that explain these
> concerns?

If DSP/BIOS for DM642 is same with DSP/BIOS for C6711,
in which I am working, you will find stack setting for
TSK object in its Properties page (right mouse over
your TSK object and select Properties). Documents:
DSP/BIOS API Reference Guide and DSP/BIOS User's Guide.

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 Today my program on C6713 wasn't working when I INCREASED task stack size ( from 4k to
16k ) !! 

Anyone met/solved such problem ?

The reason is very difficult to trace because it somehow spoils UART communication, but I can't
find how. I checked map files for projects with different stacks sizes - they are exactly the
same except the stack size and all stuff placed after the stack which is moved forward. 

And related question - if each task has its own stack, what is than "run-time stack"
?

   Gregor

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