Scott Dattalo wrote:
>
> nogueira wrote:
> > <snip>
> >      I'd like to get help solving this:
> >
> > TEMPERATURE=TEMP_READ-0.25+(COUNT_PER_C-COUNT_REMAIN)/COUNT_PER_C
> >
> > where:
> > TEMP_READ = 8 bits
> > COUNT_PER_C = 8 bits
> > COUNT_REMAIN = 8 bits
> > TEMPERATURE = 8 bits
> >
> > I just want a small routine to do this math.
>
> It's about time somebody asked another PIC related math question!
>
> Suppose you make this little simplification:
>
> TEMPERATURE=TEMP_READ-0.25+(COUNT_PER_C-COUNT_REMAIN)/COUNT_PER_C
>            =TEMP_READ-0.25+ 1 - COUNT_REMAIN/COUNT_PER_C
>            =TEMP_READ+0.75 - COUNT_REMAIN/COUNT_PER_C
>
> Now, for an assumption/question. I assume that "TEMP_READ" is an 8-bit
> integer that is very close to the correct temperature. The rest of the
> equation is the fractional portion of "TEMPERATURE". Or maybe it is at
> most one or two counts. Are these assumptions true?


> If so, there are two tricks I can think of that can efficiently "solve"
> this equation. But rather than posting a solution without first knowing
> the problem, I'll wait to you verify the assumptions.
>
> Scott


Yes, you are absolutely right.

Octavio

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Octavio Nogueira
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