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Re: [avr-gcc-list] Accessing structures defined in ROM ?

From: Vincent Trouilliez
Subject: Re: [avr-gcc-list] Accessing structures defined in ROM ?
Date: Mon, 26 Sep 2005 18:54:34 +0200

On Mon, 2005-09-26 at 10:24 -0500, Andy Warner wrote:
> Vincent Trouilliez wrote:
> > [...]
> >     i = pgm_read_byte( p->nb ); //should return 3, but doesn't...
> Try:
>       i = pgm_read_byte(&(p->nb));
> After all, pgm_read_byte() takes the address of a byte to read,
> so you need to pass it the _address_ of the object you want.

Thanks Andy and Bernard, that worked. But I don't really understand the
syntax. Doesn't "p->nb" mean "the address of the element nb that's in
the structure pointed to by pointer p" ?? So adding a '&' means, take
the address of that address...  passing the address of the address of
the data....does that make sense ?! :-/

Brrr, I am very confused now...


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