Working on a driver for an ISDN device[1] designed to transfer the actual B channel data of an established ISDN connection over a pair of isochronous pipes, one for each direction.
I am setting these up by first submitting three URBs for each pipe, before sending the command for actually establishing the B channel connection to the devide over the default control pipe. Conversely, I unlink the URBs after the device has signalled the connection to be closed. Annoyingly, this results in a couple of EILSEQ errors being signalled every time a connection is started or terminated. My guess is that this is caused by the isochronous pipe not running yet/anymore. I don't know why this should cause a CRC error, but as there are several reports in the list archives that EILSEQ can result from many other causes than the official "CRC error", I guess it's just another one of those. As this is generating a lot of questions from users, I would like to avoid these error messages, but I don't see how. If I send the connect command before submitting the URBs I fear the isochronous pipe might stall if I am not quick enough, and on closing the connection I do not even have that option, because the connection can be closed at any time by the other party. What is the supposed sequence of actions for setting up and tearing down isochronous pipes? Are these EILSEQ errors unavoidable? Should I just ignore them, and if so, how do I distinguish them from serious ones which might also occur - such as actual CRC errors? Thanks in advance for any hints Tilman [1] Siemens Gigaset family of ISDN DECT bases - see http://sourceforge.net/projects/gigaset307x/ -- Tilman Schmidt E-Mail: [EMAIL PROTECTED] Bonn, Germany Diese Nachricht besteht zu 100% aus wiederverwerteten Bits. Unge�ffnet mindestens haltbar bis: (siehe R�ckseite) ------------------------------------------------------- The SF.Net email is sponsored by: Beat the post-holiday blues Get a FREE limited edition SourceForge.net t-shirt from ThinkGeek. It's fun and FREE -- well, almost....http://www.thinkgeek.com/sfshirt _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
