Raphael Neider wrote:
>>> Something along this lines may work:
>>> void MINOR_VERSION (void) _naked
>>> .area MY_VERSION (ABS)
>>> .org 0xaffe
>>> .db 0x01
>> Thanks; it works (when at the end of the file, otherwise everything in
>> the file is at 0xaffe), but changes the type of MY_VERSION from uint8_t
>> to void(* )(void).
>> I want to access MY_VERSION from both inside my code (where I'd prefer
>> it to have the type uint8_t) and from a peripheral, which can access the
>> memory (which is why I need the fixed location).
> Just an idea (untested): Possibly you can
> #define MY_VERSION (*((uint8_t *)((void *)&MY_VERSION)))
> *after* the function definition to implicitly cast the type for use in C
> (or rename MY_VERSION in the _asm-block to MY_VERSION2 and
> define the above macro whereever suitable---breaks symbolic
> references across object files, though, since MY_VERSION is no longer
> a (global) symbol.).
> The weird cast might even be stripped down to (*(uint8_t *)MY_VERSION),
> I cannot try it out right now...
> Raphael Neider
Thanks, here's my final working version (I had to add another .area,
otherwise the rest of the file would be placed at wrong locations):
void MINOR_VERSION_DATA(void) _naked
.area MY_VERSION (ABS)
#define MINOR_VERSION (*(uint8_t *)((void *)(&MINOR_VERSION_DATA)))
I still think that there should be a simpler and more elegant way to do
I can't try out the #pragma constseg solution suggested my martenbrook,
since I use the Debian packages, which don't include that feature yet.