Hmm...maybe I should actually *read* stuff a bit more thoroughly before
diving in with both feet....
I kinda missed the bit about the bit positions you were using, I assumed you
were reading bits 1 -4 for the port.

Yep, total b*ll*cks I'm afraid, my only defence being that I got up at 5:30
this morning.

Having looked at your code properly now (i.e after 4 cups of coffee) the
problem seems to be that you can't do bit sets or clears on W, it isn't
addressable as a normal file register.  You'll have to do the bit operation
on a defined variable and copy it back to W.

Sorry about that!

Regards

Mike Rigby-Jones
mrjones@nortelnetworks.com



> > > (assume SWITCH has been equated to a spare ram address)
> > >
> > >       movf    GPIO,w          ; get switch valuesI'll try to follow
> you on this...
> W = 00DC0BA0
> > >       movwf   SWITCH  ; store in ram locationSWITCH = 00DC0BA0
> > >       rlf     SWITCH,f        ; rotate left to put in bits 0 - 3SWITCH
> = 0DC0BA0x   where x = CARRY
> >         movlw   0xf0            ; clear top nibble (may not need this)W
> = 11110000
> >         andwf   SWITCH,f        ;SWITCH = 0DC00000
> > >       swapf   SWITCH,w        ; swap upper and lower nibbles and put
> back in wW = 00000DC0
> Hmmmm, I need W = DCBA0000
>
> Did I miss something?  I have been up all night and it is now 5:20AM so
> anything is
> possible.
>
> Does my BSF idea have any holes that you see?
>
> Thanks for the reply.
>
> Michael
>
> * TAKE THE '.NOSPAM' OUT OF MY ADDRESS TO REPLY
> **********************************************
> Outside of a dog, a book is man's best friend.
> Inside of a dog, it's too hard to read anyway!
>                                   Groucho Marx
> **********************************************
>