Here is a snippet I've used successfully using 'C'.

It does suffer from false readings if the knob is turned to fast, but
for the use I needed that wasn't a problem.

//Encoder 'A' output on PortA,1 'B' output on PortA,0. Port pins
//pulled low via 2*10K resistors
void getenc()
{

        //encoder channel B=0
        if (!bRA0)
          old_enc_state=1;                      //show that we've got here

        if ((bRA0) && (old_enc_state))          //if Channel B now =1
         {
           if (bRA1)                            //if encoder now =11 ,we're going CW so increment
            {
               enc_state=1;                     //set enc_state to show
               old_enc_state=0;                 //set to zero, wait until this event again
            }

           if((!bRA1) && (old_enc_state))       //Channel A=0 and B =1
going CCW
            {
               enc_state=-1;
               old_enc_state=0;
            }

         }
        else
         {
           enc_state=0;                         //encoder hasn't moved
         }


Colin

--
cdb, bodgy1@optusnet.com.au on 15.08.2003

I have always been a few Dendrites short of an Axon and believe me it
shows.

Light travels faster than sound. That's why some people appear bright
until they speak!

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