Re: [sdcc-devel] problems with printf

[Randy Y. <ya...@di...>]

Randy Yates <ya...@di...> writes:

> "Maarten Brock" <sou...@ds...> writes:
>
>> Hello Randy,
>>
>>> What I AM doing is calling an assembly routine from c.
>>>
>>> If I have an assembly routine with the following signature:
>>>
>>> uint8_t my_func(uint8_t chr);
>>>
>>> then wouldn't the assembly code for handling the passed parameter "chr" be
>>>
>>>                 MOV         A,dpl           ;Put 'chr' parameter in A
>>>
>>> and when it's done, wouldn't the result be put back into dpl?
>>>
>>>                 MOV         dpl,a           ;dpl (return value) = 'A' even
>>> parity
>>>                 RET                         ;All done
>>>
>>> --RY
>>
>> Yes, that's correct.
>
> Thanks Maarten. 
>
> I have another question: How do I control where the stack is located
> when using sdld? I see the stack size can be controlled via the -S
> option, but I don't see a stack location option.

PS: It looks like it's getting located at 0x08 on startup (beginning of
second register bank). I think a better initial value would be 0x30,
the beginning of internal non-SFR memory just past the bit-addressable
memory. That gives you to 0x7F, or 80 bytes, to grow.
-- 
Randy Yates
Digital Signal Labs
http://www.digitalsignallabs.com