Date: Tue, 30 Oct 2012 13:41:00 +0100 From: Hans Petter Selasky <hselasky@c2i.net> To: freebsd-usb@freebsd.org Subject: Re: isochronous transfer for UVC camera Message-ID: <201210301341.00350.hselasky@c2i.net> In-Reply-To: <20121030.202247.226801724.toshi@ruby.ocn.ne.jp> References: <20121029.215434.122618874.toshi@ruby.ocn.ne.jp> <20121030.000648.193690728.toshi@ruby.ocn.ne.jp> <20121030.202247.226801724.toshi@ruby.ocn.ne.jp>
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On Tuesday 30 October 2012 12:22:47 SAITOU Toshihide wrote: > In message: <20121030.000648.193690728.toshi@ruby.ocn.ne.jp> > > SAITOU Toshihide <toshi@ruby.ocn.ne.jp> writes: > > In message: <201210291436.08940.hselasky@c2i.net> > > > > Hans Petter Selasky <hselasky@c2i.net> writes: > >> On Monday 29 October 2012 13:54:34 SAITOU Toshihide wrote: > >>> #define PKT_LEN 0x1400 > >> > >> The packet length is not this value I think. > >> > >> The 0x1000 is part of the packet multiplier for High-Speed USB's > >> wMaxPacketSize. > >> > >> It is (1+2) * 0x400. Try that and see what happens. > > > > Thank you for your quick response. > > > > I can't use the FreeBSD now so I will try this tomorrow. But Mac OS X > > 10.6.8 with libus 1.0.9, callback is not invoked too with some > > combination of the value below: > > Hi, > > #define PKT_LEN 0x400 > > #define PKTS_PER_XFER 8 > You can compare with output when running webcamd. Make sure webcamd is not running when you start your application! > It dose not affect on the FreeBSD. PKT_LEN should be 0xC00 > > >> Also there is usbdump -i usbusX -f Y -s 65536 -vvv, which will show the > >> actual traffic. > > ! This is very useful. > > $ usbdump -i usbus2 -f 4.0 -s 65536 -vvv (unit 4) To get both READ and WRITE control requests, you should do: usbdump -i usbus2 -f 4.0 -f 4.128 -s 65536 -vvv > $ usbdump -i usbus2 -f 4.130 -s 65536 -vvv (unit 4, endpoint 0x82) > > I have compared with other application (pwcview). > > There are a lot of VS_PROBE_CONTROL transfer than expected. But it may > not be a problem because I have tried these transfer reproduced from > dump data. The problem I noticed is that the libusb_claim_interface of > my code is not logged. Is this function really implemented? The claim interface is almost like a NOP under FreeBSD. > > libusb_set_interface_alt_setting(handle, 1, 1); > libusb_control_transfer(handle, 0x01, 0x0b, 0x0100, 0x0100, NULL, 0, > TIMEOUT); --HPS
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