Re: [Sdcc-user] Pointer in data, pointing to xdata

[Bernhard H. <ber...@be...>]

> xdata unsigned char * data p;
>
> I need the pointer to physically reside in RAM because I need to change it.
> It will be used for system log storage.
>
> I should then be able to write using something like
> *p=0xFF;
> and read like
> t=*p;
> as in standard C, correct?
>
> Will this work? If not, how do you recommend I implement this?
It's perfect!

> The NVRAM I am using is a dallas chip that also has a RTC (Real Time Clock)
> on it. I will have to access the time locations on the chip also, which are
> access identially to any other RAM location. Can I use a declaration like
> this? :
>
> xdata at 0x7FFF unsigned char YEAR ;
>
> These make sense to me, but I would like to pass it by someone first :)
Everything's ok. If don't want YEAR appearing in the map file, you could use:

#define YEAR (*(xdata unsigned char *) 0x7fff)

Bernhard