Date: Tue, 25 Jul 2000 11:00:22 +0200 From: Graham Wheeler <gram@cequrux.com> To: Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp> Cc: "Jordan K. Hubbard" <jkh@zippy.osd.bsdi.com>, stable@freebsd.org Subject: Re: psmintr: out of sync (0080 != 0000). ARGH! Message-ID: <397D5726.559EE428@cequrux.com> References: <25919.964459652@localhost> <397D415E.64DD5CE0@cequrux.com> <200007250846.RAA25921@zodiac.mech.utsunomiya-u.ac.jp>
next in thread | previous in thread | raw e-mail | index | archive | help
Kazutaka YOKOTA wrote: > > >I'm also very willing to help. > [...] > >The hacks that I made, which have made my mouse completely usable > >(that's not to say perfect, but I seem to have reduced the problem to > >only the transitions between the 3-byte and 4-byte states), perform > >extra sanity checks on the data and try to detect when these transitions > >occur. After a transition to the 4-byte state, my code drops the zero > >bytes that are being inserted; after a transition back to the three byte > >state, they stop dropping these. There is another behaviour which I forgot to mention - the zero byte can occur either before or after the sync byte. So I get three types of packets: zero sync X Y sync zero X Y sync X Y The last of these is the correct format; the other two are not. My hacked driver is capable of handling all three, and detecting transitions between them. Any particular behaviour can last anything from a few seconds to a few minutes before it changes to one of the other states. I had almost concluded that I just had buggy hardware, but after Jordan's message it seems that perhaps there is a bug somewhere in the code after all (although I think its as likely to be in kbd.c or elsewhere as it is in to be in psm.c - making it, as Jordan said, a real nasty to find). -- Dr Graham Wheeler E-mail: gram@cequrux.com Director, Research and Development WWW: http://www.cequrux.com CEQURUX Technologies Phone: +27(21)423-6065 Firewalls/VPN Specialists Fax: +27(21)424-3656 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?397D5726.559EE428>