Re: [avr-chat] Strange struct problem

[Russell Shaw]

Daniel O'Connor wrote:
> On Fri, 9 Dec 2005 10:52, Russell Shaw wrote:
>
> > > Any help gratefully received!
> >
> > Beware of structure padding leaving holes.
> >
> > http://www.eskimo.com/~scs/C-faq/q2.12.html
> > http://www.eskimo.com/~scs/C-faq/q2.13.html
>
> Hmm, I tried..
>     struct foo { 
> 	uint8_t a;
>         uint8_t b;
>         uint8_t c;
>         uint8_t d;
>         uint8_t e;
>     } __attribute__ ((packed)) abc = {
>         1,
>         2,
>         3,
>         4,
>         5
>     };
>
> but there is no change in behaviour.
>
> I would not expect GCC to pad [too much] on AVR anyway because the processor 
> doesn't require aligned access.

Because i haven't got a running system to test it on, i can only infer
things at a distance. I can't see any bugs in the supplied code. Maybe
it's interaction or something being overwritten by another part of your
system?