Hi,
late reply, been out of the loop for a while,

anyway, Edson Brusque wrote:
<snip>
>    The only problem I've found if when going from 0 to 255 or from 255
to 0:
>
>    filt =3D filt + ((new - filt)+1) / 2
>    filt =3D 0 + ((255 - 0)+1) / 2    <--- 255+1=3D256, it will roll to =
0
>    filt =3D 0 + (0) / 2
>    filt =3D 0 <--- should be 255
>
>    Anyway, I can solve this doing 16 bit operations or (easier) with a
>       couple of "if" clauses.
<snip>
Well remember that you actually have 9 bit's in the working register,
you can also use the carry, in this case, assuming the constants you use
and the flow, would give:

filt =3D filt + ((new - filt)+1) / 2
filt =3D 0 + ((255 - 0)+1) / 2    <--- 255+1=3D256, it will roll to 0 ** =
and
carry will be set **
filt =3D 0 + (0) / 2              <---- use RRF, it will roll in the =
carry
as top bit and produce
filt =3D 128 <--- should be 255 **nope** should be 128 ( ffrac is =3D 2 =
)


/Tony

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