Right now, I tried to use the USB driver (the musb folder) from the
arago kernel. With this driver I can capture the video from the webcam.
So, something important must be different!
BUT, as I already mentioned I had a problem with "USB WLAN sticks" when
I use the arago kernel. And this is also the case if I use the USB
driver from the arago 2.6.32 kernel with the khilman 2.6.34 kernel.
But I need to use USB WLAN devices together with USB webcams. Maybe
someone could help me to get this running!
One thing a forgot to mention about the used hardware is that I have a
USB hub IC (ISP1521) between my USB devices and the USB host interface
of the Davinci processor. Maybe this hub chip makes also some problems.
Thanks for your help so far,
Andreas
PS: I also tried to adjust the FIFO buffers but this was not the solution.
PPS: Maye, I should write a new post for the WLAN problem!?
Subbrathnam, Swaminathan schrieb:
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
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