Andreas, Pl. ensure that the FIFO is configured correctly. Probably this error could mean you need a 1024 byte fifo space and it is not available. If so increase the fifo space in musb_core.c file.
Regards Swami > -----Original Message----- > From: davinci-linux-open-source- > [email protected] [mailto:davinci-linux-open- > [email protected]] On Behalf Of > Andreas Auer > Sent: Tuesday, April 13, 2010 2:32 PM > To: Markus Rechberger > Cc: [email protected] > Subject: Re: UVC webcam problem > > Markus Rechberger schrieb: > > On Tue, Apr 13, 2010 at 10:27 AM, Andreas Auer <[email protected]> > wrote: > >> Hi, > >> > >> I'm trying to get a UVC webcam working with the latest khilman kernel > >> (2.6.34) on a Davinci EVM like board with DM6446 processor. > >> > >> I'm able to request the buffers and queue them without errors. But if I > >> switch on the streaming the UVC driver tells me: > >> "uvcvideo: USB isochronous frame lost (-18)." > >> > >> Some time ago, I tried the 2.6.32 kernel from the arago project and > webcam > >> capturing was working out of the box but WLAN was not working. (so, I > >> switched to the khilman kernel). > >> > >> Maybe, someone can help me with the uvc webcam problem!!! > >> > > > > with our tests the DM6446 only supported up to around 4.5 mbyte of > > isochronous data... > > Raw Analog TV 720x576x25 requires around 170 mbit, I guess webcams are > > near to that level there's no chance to get such a thing work. > > Maybe MJPEG or MPEG based devices can work with it. > > Thanks for your reply. I have a Logitech QuickCam Communicate Deluxe > with MJPEG format. And this webcam is working with the 2.6.32 kernel > from the arago project. So, I think this cam should be working. > > Does anyone know what's the above "status code" -18 means?? > > Thanks, > Andreas > _______________________________________________ > Davinci-linux-open-source mailing list > [email protected] > http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source _______________________________________________ Davinci-linux-open-source mailing list [email protected] http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
