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Stack Size and Profiling

 
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dcm684



Joined: 08 Sep 2010
Posts: 8

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Stack Size and Profiling
PostPosted: Wed Sep 08, 2010 11:15 am     Reply with quote
I was reading through the FAQ and noticed that the sum of my stack usage should be less than 9. Currently my stack usage is 14 (7 in main + 7 in ISR).

Is there a software means of profiling my stack usage to find where the software stack is being used? Or is the only way to find stack usage is to find where a function is being called by both the ISR as well as via the main() routine?

Even though I don't believe that I have had any problems related to the stack in the past two years, where is has always been 12 or more), I am now running in to some erratic behavior that might be related to stack overflow. Could a stack overflow cause the CCP5CON special function register to be cleared? And could a stack overflow cause the following to occur:

Code:
char aChar = 'f';
int8 anInt = 16;
fprintf(UART1, "%c %X", aChar, anInt);

This sometimes prints "%c %X" instead of "f 16".

Thanks.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Sep 08, 2010 11:19 am     Reply with quote
That limit is for 16F. For 18F it's 31 stack levels.
dcm684



Joined: 08 Sep 2010
Posts: 8

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PostPosted: Wed Sep 08, 2010 11:42 am     Reply with quote
PCM programmer wrote:
That limit is for 16F. For 18F it's 31 stack levels.

Okay. I am using an 18f chip. So it looks like the stack is not the cause of those other problems.

Thanks.
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