Using a rotary encoder with AVR Micro controller

Question

I\'m having trouble getting a rotary encoder to work properly with AVR micro controllers. The encoder is a mechanical ALPS encoder, and I\'m using Atmega168.

Cla

Answer 1

/* into 0 service rutine */
if(CHB)
{
  if(flagB)
   Count++;
  FlagB=0;
}
else
{
  if(FlagB)
   count--:
  FlagB=0:
}

/* into 1 service rutine */
FlagB=1;

/* make this give to you a windows time of 1/4 of T of the encoder resolution
   that is in angle term: 360/ (4*resolution)
 */