Debug DLL for FTDI D2XX ? Software USB Sniffer for D2XX communication ?

Hello,

does someone know if there is a debug dll for FTDI D2XX ? I want to trace 
every call and every data packet which is exchanged over the DLL.
There was something for CAPI (ISDN) long time ago, which i think should also 
work for D2XX. The original DLL was renamed and a new DLL was created which 
was just a wrapper and calls the original functions of the renamed DLL.

Is such a thing existing ? Or is there meanwhile a general way of doing this 
?

By the way: Is there any software USB sniffer which is able to trace USB 
communication between FTDI D2XX driver and FTDI chip itself ? Or is there 
even a description of the communication protocol itself ?

Regards,

        Martin

Martin Maurer wrote:
> Hello,
>
> does someone know if there is a debug dll for FTDI D2XX ? I want to trace
> every call and every data packet which is exchanged over the DLL.
> There was something for CAPI (ISDN) long time ago, which i think should also
> work for D2XX. The original DLL was renamed and a new DLL was created which
> was just a wrapper and calls the original functions of the renamed DLL.
>
> Is such a thing existing ? Or is there meanwhile a general way of doing this
> ?
>
> By the way: Is there any software USB sniffer which is able to trace USB
> communication between FTDI D2XX driver and FTDI chip itself ? Or is there
> even a description of the communication protocol itself ?
>
> Regards,
>
>         Martin


I've used a usb sniffer (sw) for that,  don't remember the name,
probably found it on http://www.lvr.com/usb.htm

I haven't seen a description of the protocol, but you can look at the
source for the 
Linux  driver its all there.

-Lasse