AVR-Chat

Hi,

I have a question about abtaining the absolute value. I want to 
substract a 1 16bit values from eachother, but when the result is 
negative, set a bit and get the absolute value of the difference.

I thought of the following, but that doesn't seem to work:

...
   ldi direction, 0
; Substract values
   sub moveL, curPosL
   sbc moveH, curPosH
; If result positive, ok
   brcc PM1
; Result negative, take absolute value and set flag
   neg moveL
   neg moveH
   ldi direction, 1
PM1:

Any hints?

Regards and best wishes for 2005 to all,

Geert