Re: [PIC] Learning C

Hi Forrest,
I am intrigued by what you say. Could you please point me at any specific 
embedded C compilers that do this.

Friendly Regards
Sergio Masci

On Sun, 17 Nov 2024, Forrest Christian (List Account) wrote:

> With many embedded compilers, x may or may not be on the stack, as the
> compiler will, in some cases, use non-stack memory for local variables.
> This is especially true on smaller microcontrollers with limited stack
> space.
>
> One would need to read the compiler manual to determine if x will always be
> on the stack,  whether there is a way to force x to be on the stack,  or if
> there is a compiler specific way to get the stack pointer.
>
> On Sat, Nov 16, 2024, 4:09 AM smplx <[email protected]> wrote:
>
>> write a function:
>>
>> void * get_stack_ptr(void)
>> {
>>         int x;
>>
>>         return &x;
>> }
>>
>> This will return the address of the local variable x which will be on the
>> stack.
>>
>> use it as:
>>
>>         if ((unsigned long)get_stack_ptr() == (unsigned long)fixed_value+N)
>>
>> // where N is a constant TBD (around +/- 4 to 12)
>>
>>
>> On Fri, 15 Nov 2024, David VanHorn wrote:
>>
>> > Same here. I can work with c fairly well, but some things seem unusually
>> > difficult in c.  Like comparing the current value of the stack pointer
>> to a
>> > fixed value ( used in my sanity check routine)  I assume there is a way
>> to
>> > get there.
>> >
>> > On Sun, Nov 10, 2024, 11:34 AM David C Brown <[email protected]> wrote:
>> >
>> >> Although I enjoy programming in Assembler, the fact that so many
>> libraries
>> >> abd code examples are in C I think that the time has come for me to
>> learn
>> >> that language.
>> >>
>> >> Any advice on how to do that would be welcomed, be it a book or online
>> >> resources.
>> >> I am a competent programmer having programmed in  with Forth, Fortran.
>> >> \Pascal, Visual basic
>> >> __________________________________________
>> >> David C Brown
>> >> 43 Bings Road
>> >> Whaley Bridge
>> >> High Peak                           Phone: 01663 733236
>> >> Derbyshire                eMail: [email protected]
>> >> SK23 7ND          web: www.bings-knowle.co.uk/dcb
>> >> <http://www.jb.man.ac.uk/~dcb>
>> >>
>> >>
>> >>
>> >> *Sent from my etch-a-sketch*
>> >> --
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