Date: Tue, 30 Oct 2012 22:31:38 +0900 (JST) From: SAITOU Toshihide <toshi@ruby.ocn.ne.jp> To: hselasky@c2i.net Cc: freebsd-usb@freebsd.org Subject: Re: isochronous transfer for UVC camera Message-ID: <20121030.223138.71086080.toshi@ruby.ocn.ne.jp> In-Reply-To: <201210301341.00350.hselasky@c2i.net> References: <20121030.000648.193690728.toshi@ruby.ocn.ne.jp> <20121030.202247.226801724.toshi@ruby.ocn.ne.jp> <201210301341.00350.hselasky@c2i.net>
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In message: <201210301341.00350.hselasky@c2i.net>
Hans Petter Selasky <hselasky@c2i.net> writes:
> 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
Yes, I tried this too because usbdump of the pwcview use this value.
The webcamd is not running when I was logging my code.
>> >> 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.
Is this true about these functions below? I compare with pwcview +
webcamd using ``usbdump -i usbus2 -f 4 -s 65536 -vvv'' the noticeable
difference is existence of the SET INTERFACE request.
>> libusb_set_interface_alt_setting(handle, 1, 1);
>> libusb_control_transfer(handle, 0x01, 0x0b, 0x0100, 0x0100, NULL, 0,
>> TIMEOUT);
Thank you.
---
SAITOU Toshihide
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