[c-prog] Re: Volatile variable in C

[John Matthews]

--- In c-prog@yahoogroups.com, "John Matthews" <jm5...@...> wrote:
>
> --- In c-prog@yahoogroups.com, "Sharma, Hans Raj \(London\)" 
> <hansraj_sharma@> wrote:
> >
> > Can someone please help me understand how can I write a program which,
> > using volatile variable, access some memory mapped devices?
> 
>   volatile unsigned char *const reg = 0x1234;

...or:

#define reg ((volatile unsigned char *)0x1234)