Lpc2000

> > DECwiz (Fred van Kempen) :
> > Further checking revealed, that something else was wrong: I was
> >
> > using bitfield structures to reference (and initialize) the BCFG2
> > register.  A printf() on its contents (both in the GNUARM and IAR
> > versions) showed a major difference.  I changed that code to just
> > ...
> >
> > So... the bitfield structures don't seem to work with GCC, which I can
> > live with now I know it...
>
> The order how the bits are stored in a bitfield is not defined by
standard.
> This might be the reason, why gcc writes a different value than IAR.
>
> -- 
> 42Bastian Schick


No, it is a different (and known) problem.

The GCC compiler will use a byte or word16 access to set/clear a small field
in the word32: and that will fail on an I/O register that can only be read
or written 32 bits at a time.
You could do the bitfield operations on a copy in RAM, then write the
complete value to the register.

Bit me too (pun intended).

Arie de Muynck