optical quadrature decoder algorithm for motor feedback

[fireball003]

quadrature encoder algorithm

Hi,
Does anybody have the algorithm of optical quadrature decoder for motor feedback?

 

[grabik]

optical quadrature encoder

Look on this page

http://www.sxlist.com/techref/microchip/qenc.htm

in my opinion this is most efficient routine for interfacing quadrature encoder.

http://www.mcselec.com/index.php?option=com_content&task=view&id=79&Itemid=57

 

[jjyeh1976]

quadrature decoder

The attachement is for 2 axis decoder, you can modify it to 1 axis decoder, written in asm