On Wed, Feb 11, 2004 at 05:13:07PM -0800, David Brownell wrote:
don wrote:
I have a device based on an EZUSB-FX2 part. It sends data with ISO
packets. My code uses the usbdevice_fs calls. It works on several
systems with 1.1 USB ports, but not on a 2.0 system. The call to
ioctl (device_fd, USBDEVFS_SUBMITURB, urb)
gets an error return -EINVAL.
There was a patch someone posted a while back, to set urb->interval when used with usbfs. I remember the patch being incorrect, since it assumed the interval was always 1 frame (or 1 uframe, at high speed), but likely that's your basic problem -- kernel bug.
Would this explain an EINVAL return from submitting a URB?
Yes, and the patch was
http://marc.theaimsgroup.com/?l=linux-usb-devel&m=106759963117426&w=2
but it should be "interval = 1 << (ep_desc->bInterval - 1)" as I recall. Someone should fix that patch and submit it...
- Dave
------------------------------------------------------- SF.Net is sponsored by: Speed Start Your Linux Apps Now. Build and deploy apps & Web services for Linux with a free DVD software kit from IBM. Click Now! http://ads.osdn.com/?ad_id=1356&alloc_id=3438&op=click _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
