The following reply was made to PR usb/149675; it has been noted by GNATS. From: Hans Petter Selasky <hsela...@c2i.net> To: Paul Thornton <p...@prt.org> Cc: freebsd-usb@freebsd.org, freebsd-gnats-sub...@freebsd.org, e...@freebsd.org Subject: Re: usb/149675: uftdi doesn't react to break properly Date: Sun, 15 Aug 2010 21:11:59 +0200
On Sunday 15 August 2010 20:57:44 Paul Thornton wrote: > Hi, > > Hans Petter Selasky wrote: > > I believe the following patch will fix your problem. Please apply and > > rebuild kernel / ucom module. > > That has made a dramatic difference - things now look much better. > Thank you very much for that. > > I'm still seeing a slight problem though. In my test setup, I have a PC > (Windows but that shouldn't matter!) running an appplication which > transmits a break followed by the 513 data bytes - and this repeats > continually at near line-rate at 250kbaud. > > Pre-patching, FreeBSD was unable to keep data byte 1 in location 1 at > all - it appeared randomly wherever it happened to be due to the lack of > break clearing the input buffer, and as the data dump of the buffer > refreshed, the values moved around as the breaks were turning up as datab. > > After I've applied the patch, it starts off well - data byte 1 is in > location 1, but every 5-10 seconds there is a shift by a byte suggesting > that an extra byte has been received. Is there any way that a break > could still be creeping in to the data stream periodically? > > Under Linux, the code runs properly and there is no movement of the data > bytes, so I'm reasonably confident that it isn't a bug of mine. > > Paul. I guess you will have to turn on ucom and uftdi debugging knobs under hw.usb.xxx to figure that out. USB is just forwarding what it gets from the hardware. --HPS _______________________________________________ freebsd-usb@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-usb To unsubscribe, send any mail to "freebsd-usb-unsubscr...@freebsd.org"
