Re: [avr-chat] Write sequence

[Eric Weddington]

Keith Gudger wrote:
> Thanks for the replies.  I tried volatile, and it did not make any
> difference.
>
> I got the tool chain from the web, and compiled it myself.  Is there
> something wrong with the gcc version?  Thanks.  (I know that avr-libc and
> binutils are acceptable versions.)

No, they're fine.


> > > I have a macro defined:
> > >
> > > #define WRITE_4BYTES(x, y) { CS_LOW \
> > >            *(BASE + ((y) ))) = (INT8U) (x); \
> > >            *(BASE + ((y + 1)))) = (INT8U) (x >> 8);\
> > >            CS_HIGH }
> > >
> > > (where BASE is defined as an 8 bit pointer with a value 0x8000 in ext
> > > ram and the macros CS_LOW and CS_HIGH are predefined to set a pin lo /
> > > high).
> >
> > > get the following (for the atmega128):
> > >
> > >    42f2:       31 83           std     Z+1, r19        ; 0x01
> > >    42f4:       20 83           st      Z, r18

Keith, can you provide more context of the assembler output?

Thanks


--
Eric Weddington