H1 2015 Priorities and Bare-Metal Programming

[Walter Bright via Digitalmars-d]

On 2/1/2015 9:21 PM, Daniel Murphy wrote:
> "Walter Bright"  wrote in message news:mam6qe$15nu$1 at digitalmars.com...
>> > We also need a pragma(address) to complement pragma(mangle).
>>
>> What would that do?
>
> It would allow naming a memory address, similar to using .org in assembly.
>
> eg
> pragma(address, 0x0025)
> shared ubyte PORTB;
> static assert(&PORTB == cast(ubyte*)0x0025);
>
> This is a much nicer version of C's
> #define PORTB (*(volatile unsigned char *)0x0025)

That's what I suspected :-)

   struct Ports {
     static ubyte B() { return volatileLoad(cast(ubyte *)0x0025); }
     static void B(ubyte value) { volatileStore(cast(ubyte *)0x0025, value); }
   }

   ...
   Ports.B = 7;
   foo(Ports.B);

gets the job done. Of course, you could take it further and make a template out 
of it:

   auto Ports = Port!(ubyte, 0x0025);