Re: getting 1394 port information

On Sun, 2004-02-01 at 01:46, pat leang wrote:
> How would I find out if it is a multi-port card? I'm don't quite undestand
> the concept of a multi-port card. Here is a link to the type of card I
> have.

I think Dan is referring to cards with more than one link layer and
physical layer chip sets and the connectors are split between them.

> http://www.motionio.com/
> As you can see, there are 3 physical ieee1394 connectors. If I connect a
> camera to one of the physical connectors, is it possible to know from which
> connector the camera is connected to? I use the libdc1394 library routines,
> but it doesn't seem possible.

It really shouldn't matter which connector your camera is connected to.
All three connectors are interchangeable. If you have more than one
camera and want to keep track of which one is which, it is much better
to use the GUID number rather than which connector the device is
connected to.

> Thanks.
>
>
> >On Fri, 2004-01-30 at 17:37, pat leang wrote:
> > > I have an ieee1394 card that can support up to 3 firewire cameras. I
> >was
> > > wondering if it is possible to determine which port the cameras are
> >attached
> > > to. Each camera has a unique GUID, and sometimes they are connnected to
> > > different ports on the ieee1394 card. I'd like to be able to find where
> > > each camera is connected on the card by matching their GUID with the
> >port.
> > > Is this possible? and how?
> > >
> >No, the physical connector on the card is meaningless unless you have a
> >multi-port card. But your usage of the term "port" differs from what I
> >mean by a "multi-port card." In IEEE 1394 terms, a "port" refers to a
> >virtual host adapter. In IEEE 1394, the software interface knows nothing
> >about physical connectors. However, on a multi-port card, some connector
> >are assigned to one virtual host adapter or another. What is the model
> >of your adapter?
> >

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Received on Sun Feb 1 19:13:10 2004