All,

 I have been working with a rotary encoder that I am planning to use as
a control for a piece of test=20
 equipment at work.  I have looked on the web for algorithms to decode
the outputs of said encoder,=20
 and have found several.  Most of them work as advertised in my
application, but I have come up with a=20
 version that works very well in my opinion.

 I don't know whether it is new or novel, but all I have done is watch
for the "A" output to go high.
 When it does, I then read the port that the encoder is attached to.  I
mask of the bits I am interested=20
 in, and use this as an index into a table.  If the value is "01" I add
"1" to my variable.  If the value=20
 is "10", I subtract "1" by adding 255.  Any other combination "00" or
"11" adds a zero for no change.

 I have tried this out spinning the knob on the encoder as fast as I
can, and I can't see any missed=20
 counts.  I am using a delay of 2.5 mS in my routine for debouncing. =20

 If anyone is interested, I can post the code.  But my guess is I have
just on my own rediscovered an old=20
 method of decoding rotary encoders.

=20
 Regards,

 Jim



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