Cool, thanks. Both pbp,asm version works. Anyway, I tried two encoder types which I had on hand. Both works, but one count two counts to one detent, and the second count four to one detent.
I tried set the IOCBP and IOCBN to trigger only on positive edge or only on negative edge or different comination but it doesn't hepl.
Any trick to adjust this to one detent one count?