While using libftdi I noticed if I open port A then B then C then D if
I write a byte to port A the changes appear on port D. If I open B
then C then D then a any changes I send to B appear on port A. I
spent quite a bit of time trying to figure out why my code wasn't
working before stumbling on this pattern. I then tried just working
with ports A, B and C. This worked flawlessly so I assume there must
be something in the driver causing this, or did I miss something very
important in the data-sheet that is causing this behavior. I thought
I would get this on the list and see if anyone else has experienced
this as it will be a few days before I can dig further into it.
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