AVR-Chat

Oh. come on.   Unless you're using an AVR that hasn't got sufficient 
resources,
doing fractional math is no problem. Any of the available C compilers 
will do a
fine job of floating point, or fixed point math for you.

  Indeed, I saw some assembly language fixed point7.8 mat routines that 
would
probably be more than serviceable for this application on avrFreaks.org, 
just
yesterday.

tom

kernels_nz wrote:
>
> Hi Graham,
>
> Yeah, im thinking that thats probably the best way to go, I wasnt so
> much worried about speed as that I dont yet have a lot of faith in the
> compiler dealing with floating point numbers on the 8-bit processor. I
> did get an excellent reply on the Atmel ARM forum from a guy that had
> obviously done this before and he did provide me with what looks like
> a good routine to do the scale calibration and weight calculation with
> only integer math. Ill work through it tonight and report back
> tomorrow if it works!
>
> Thanks for the reply!
> Cheers
> Hein B
> Auckland, New Zeland
>
> --- In AVR-Chat@yahoogroups.com <mailto:AVR-Chat%40yahoogroups.com>, 
> "Graham Davies" <Yahoo37849@...> wrote:
> >
> > --- In AVR-Chat@yahoogroups.com <mailto:AVR-Chat%40yahoogroups.com>, 
> "kernels_nz" <kernels@> wrote:
> > >
> > > ... low sample rates (10 s/s) ...
> > > ... the bit thats got me a bit
> > > worried is migrating the code
> > > from the existing 32-bit processor
> > > to a baby AVR.
> >
> > At such a low sample rate, why not stick with the floating point? Or,
> > at least run some kind of test to find out if it's possible.
> >
> > Graham.
> >
>
>