Rotary Encoder on 20x4 LCD with pushbutton digit select and other features

[Ioannis]

On the http://www.best-microcontroller-proj...y-encoder.html site there was an article that uses a different type of encoder polling.

It is in C but if I can read it then everyone can!

I have not yet understood completely how it decodes the encoder data but seems very interesting and as the author says it decodes also the speed?

No hardware set up to test it but if anyone has the time I'd like to know the results.

Ioannis

[richard]

I have not yet understood completely how it decodes the encoder

it looks like a cruel hoax to me, maybe you need to sign up to get the working version.
if the encoder is static [on detent] after 12 polls state=0xffff
you then need 12 polls in a row where the clk pin is 0 to reach the
0xf000 state , since the polling is asynchronous I cannot see how that can happen
reliably ,so I tried it in my example

' enstate = (enstate<<1 )| enc_a | $e000
' if enstate == $f000 then
' enstate=0


' if enc_b then

and it fails as I expected when polled @5mS
the example polls @100uS , if you need that much horse power I can't see the point

[Ioannis]

Thanks for testing it Richard. It was very strange to me.

Anyway, no other version exists. I did sign in to the site but no other version exists.

Ioannis