From owner-freebsd-usb@FreeBSD.ORG Sun Aug 15 19:20:02 2010 Return-Path: Delivered-To: freebsd-usb@hub.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id E173610656A6 for ; Sun, 15 Aug 2010 19:20:02 +0000 (UTC) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (freefall.freebsd.org [IPv6:2001:4f8:fff6::28]) by mx1.freebsd.org (Postfix) with ESMTP id D0BB58FC15 for ; Sun, 15 Aug 2010 19:20:02 +0000 (UTC) Received: from freefall.freebsd.org (localhost [127.0.0.1]) by freefall.freebsd.org (8.14.4/8.14.4) with ESMTP id o7FJK29v094174 for ; Sun, 15 Aug 2010 19:20:02 GMT (envelope-from gnats@freefall.freebsd.org) Received: (from gnats@localhost) by freefall.freebsd.org (8.14.4/8.14.4/Submit) id o7FJK2qA094173; Sun, 15 Aug 2010 19:20:02 GMT (envelope-from gnats) Date: Sun, 15 Aug 2010 19:20:02 GMT Message-Id: <201008151920.o7FJK2qA094173@freefall.freebsd.org> To: freebsd-usb@FreeBSD.org From: Hans Petter Selasky Cc: Subject: Re: usb/149675: uftdi doesn't react to break properly X-BeenThere: freebsd-usb@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: Hans Petter Selasky List-Id: FreeBSD support for USB List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 15 Aug 2010 19:20:03 -0000 The following reply was made to PR usb/149675; it has been noted by GNATS. From: Hans Petter Selasky To: Paul Thornton Cc: freebsd-usb@freebsd.org, freebsd-gnats-submit@freebsd.org, ed@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