What am I doing wrong?

[mackrackit]

OK, now I think I see what you are doing. Me a little slower than normal today...

row = PORTB & %00001110

Should isolate bit 1 ,2, and 3.

[tazntex]

Well I tried that also, but that doesn't work either. I believe I mentioned earlier that I in my mind I was thinking since I moved the rows and columns over by one bit why don't I just create another variable such as:

row1 = row >> 1

then I could still use the same formula:

key = (row * 3) + (NCD (col ^ $f)) ' (row * 3) because I have three rows and when I return the priority bit
'of the columns after I flip the state of the bits ^$f that will tell me which
' column is actually the one being used at that moment of time as an output.

But I tried it and still have not gained any ground.

hmmm, back to the drawing board.

Thanks again...

[tazntex]

If I substitute this:

if row = 1 && col.0 = 0 then key1 = 1
if row = 1 && col.1 = 0 then key1 = 2
if row = 1 && col.2 = 0 then key1 = 6
if row = 1 && col.3 = 0 then key1 = 7
if row = 2 && col.0 = 0 then key1 = 5
if row = 2 && col.2 = 0 then key1 = 10
if row = 2 && col.3 = 0 then key1 = 11
if row = 3 && col.0 = 0 then key1 = 3
if row = 3 && col.1 = 0 then key1 = 4
if row = 3 && col.2 = 0 then key1 = 8
if row = 3 && col.3 = 0 then key1 = 9

for this:
key = (row1 * 3) + (NCD (col ^ $f))

everything works great but isn't there a simpler way?

Thanks