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From: Hans Petter Selasky <hselasky@c2i.net>
To: Sylvestre Gallon <ccna.syl@gmail.com>
Date: Wed, 27 May 2009 22:00:04 +0200
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Cc: Perforce Change Reviews <perforce@freebsd.org>
Subject: Re: PERFORCE change 162889 for review
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On Wednesday 27 May 2009, Sylvestre Gallon wrote:
> On Wed, May 27, 2009 at 7:29 PM, Hans Petter Selasky <hselasky@c2i.net>=20
wrote:
> > On Wednesday 27 May 2009, Sylvestre Gallon wrote:
> >> +=A0=A0=A0=A0=A0=A0=A0case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
> >> +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0/* what means frindex ? =
*/
> >> +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0libusb20_tr_setup_isoc(u=
sb20_xfer, xfer->buffer,
> >> xfer->length, 0);
> >
> > Unlike in the kernel you need to specify the buffer+length pair for all
> > ISOCHRONOUS frames up to and including "max_frames-1".
> >
> > In you code you have only setup one frame [index 0] .
>
> ok,
>
> if I understand fr_index arguments in libusb20_tr_setup_isoc refers to
> the number of isochronous packets ?

It is the index of the isochronous packet. You setup a transfer of multiple=
=20
isochronous packets at a time, and typically initialise like this:

for (i =3D 0; i !=3D MAX_FRAMES; i++) {
   libusb20_tr_setup_isoc(usb20_xfer, buf, MAX_LEN, i);
   buf +=3D MAX_LEN;
}

With regard to libusb 1.0 you need to check that structure array extending =
the=20
USB transfer for length and pointer information I think.

!NOTE! The userland libusb allowes a per-packet pointer. In the kernel the=
=20
packets must be back to back, and only one buffer pointer is used.

=2D-HPS