I am using devio.c interface to talk to usb device. I cannot make the SUBMIT_URB for bulk-in endpoint work. Here is what I am doing in my user space app. ---Open devnode, read descriptors, send ioctl for "set configuration", I get the return values 0 (success). ----Set the realtime signal hander for "submiturb", and issue ioctl "submiturb" for bulk-out endpoint with data. Signal handler gets invoked with status bit field set to 0 (success) and I suppose it also means this transaction is complete. And I notice via bus tracer that data is moving to the device. ---Now issue, "sumbiturb" ioctl for bulk-in endpoint (I know my device has data to send back). Signal handler gets invoked with status bit field set to 0(success), but the user level buffer (which is sent as parameter to usbdevfs_urb) is empty. Also, I notice in the bus trace that there is no data(or zero data) coming from device to host. This tells me I am not issuing submiturb right.
I wanted similar to asynchronous support and hence I cannot use the ioctl "USBDEVFS_BULK". Is there any other setup I should do to make "sumiturb" ioctl work? or should I issue any other ioctl in between or from within signal handler(I cant understand if the ioctls "setinterface" and "reapurb" has any relevance to this context). It seems this is a basic question(I cant find answer in archives). how can I get data from device using "submiturb" ioctl? Thanks in advance for the response. kris __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ------------------------------------------------------- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642 _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
