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Doubt on "STACK"...

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Joyhtidas

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Hi...
I am developing a appication in which the user can choose many 'operation modes'
... So to jump from one mode to another i used the 'switch' case statements...
Below shows the code structure... My doubt is that, whether the stack will overflow
when i write a code like this....

[

Thanks..
 
Last edited:

Depends which chip you're using. A PIC16 usually has an 8 level deep stack, so you could do up to 6 function calls one inside the other. The reason I say 6 instead of 8 is because you should always try to leave room for an occasional interrupt since that uses the stack as well.

Higher model chips, such as a PIC18 has a 31 level deep stack, so you have a lot more headroom to work with.
 

The answer depends entirely on the kind of processor you are using and how it implements the stack. If it is a processor with an accessible stack pointer, you can probably push hundreds of bytes on to it without any problem, if it's a small PIC for example, you might only have an 8 byte deep stack. It also depends upon the number of functions/subroutines you call elsewhere in the program and in the switch statements.
Brian.
 

Hi....
I am using the PIC24F series processor.... So i hope there won't be much problems with the stack....
As i explainied in the picture, i have many operation modes.... the user can choose from one to another
at any time... so how should i write the algorithm...?
 

Remember that with every "return" the PC is popped OUT of the stack as well. It's only if you call a function within a function 32 times.

In other words:

F1 calls F2, F2 calls F3, F3 calls F4, F4 calls F5....and so on... it'll run out of stack space quickly :)

If you have:

F1 calls F2 which calls F3, F4, F5 and so on Sequentially, it's only going to use 2 levels of stack.
 
Hi,
But in application... 5 different operation modes are there from main menu itself....
And the main menu is always accesible to the user.... Do u have any idea for this problem..?
 

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