libftdi Archives

Subject: FT4232H oddity

From: Paul Ingendorf <intra2net@xxxxxxxxxxxxx>
To: libftdi@xxxxxxxxxxxxxxxxxxxxxxx
Date: Thu, 28 May 2009 17:15:57 -0500
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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