[En-Nut-Discussion] stack size

[Alain M.]

Ernst Stippl escreveu:
> Hi Nathan!
> 
> I have already thought about how to find out and document stack space
> requirements for API functions, but I have not found a solution.
> [...]
> What I normally do is trial-and-error. Starting at (size of local vars) plus
> 512 bytes, increasing by 256. If I know there will be quite a number of
> function calls within my own code, I take 1024. 
> 
> How do you tackle that question?

I do something just a little more scientific (in other similar OSes):

When I allocate a stack I clear it all to 0x00. Whenever I am 
interested, I read it all and see how much of the stack is non-zero. 
This is a very fair evaluation of worst case stack usage, specialy if it 
is in some status screen and queried after a very long time the system 
is running.

Another important trick that I had to use sometimes is to change the 
stack for the ISRs that are more consuming. This is not so slow, and can 
reduce overall memory requirement...

Alain