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arunb
Joined: 08 Sep 2003
Posts: 492
Location: India
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| How many stack locations are used in this loop structure ? |
 Posted: Mon Oct 23, 2006 10:30 pm |
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Hi,
I have the following code...
| Code: |
void save()
{
//a do while loop is implemented here
}
int16 func7(int h)
{
//a for loop is implemented here
}
void proc4(int nGroup,int nSelStep,int DevCode)
{
int j;
j=func7();
}
void proc5()
{
int g;
//a do while loop is implemented here
}
int func2()
{
proc5();
}
int16 func1()
{
int v,m;
v=func2();
v=func2();
m=func2();
m=func2();
return(make16(v,m));
}
void main()
{
do
{
if (bTransferFrom==1)
{
bTransferFrom=0;
for (n=0;n<2;n++)
{
T1=func1();
proc4(1,4,3);
}
}while(TRUE);
}
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The above code shows the only the structure of the loops.
The code compiles well, and the LST file shows a stack usage of 7. Althogh the mcu works well sometimes for some reason it misses some operations , is it possible that the nested loop structure causes it to do so ??
thanks
arunb |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Oct 23, 2006 11:37 pm |
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| Quote: |
The LST file shows a stack usage of 7. Although the mcu works
well sometimes for some reason it misses some operations.
|
Look for code that writes beyond the end of an array.
For example, suppose you have a string that is 16 characters long.
If you create an array as in the following code, the string will over-write
the 'i' variable when you copy a string to the array.
That's because a string has a 0x00 byte at the end. It's really 17 bytes
long -- 16 characters, plus the 0x00 at the end.
| Code: |
void main()
{
char array[16];
int8 i;
} |
If the 'i' variable is being used to count iterations in a for() loop,
the code could behave in an erratic manner, and it could appear
to "miss some operations". |
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