From owner-freebsd-usb@freebsd.org Thu Sep 28 15:11:47 2017 Return-Path: Delivered-To: freebsd-usb@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id CC4B9E33D45 for ; Thu, 28 Sep 2017 15:11:47 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id B548E2B73 for ; Thu, 28 Sep 2017 15:11:47 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id v8SFBlPj052343 for ; Thu, 28 Sep 2017 15:11:47 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-usb@FreeBSD.org Subject: [Bug 222665] [uftdi] Cannot send anything if characters received ahead of first use of ftdi chip Date: Thu, 28 Sep 2017 15:11:47 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: usb X-Bugzilla-Version: 10.3-RELEASE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: ian@FreeBSD.org X-Bugzilla-Status: Open X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: ian@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_status assigned_to Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-usb@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: FreeBSD support for USB List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 28 Sep 2017 15:11:47 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D222665 Ian Lepore changed: What |Removed |Added ---------------------------------------------------------------------------- Status|New |Open Assignee|freebsd-usb@FreeBSD.org |ian@FreeBSD.org --- Comment #3 from Ian Lepore --- I'll look into this. I can confirm that a large change in the ftdi driver between 8.2 and 10.x w= as that the old code would reset the chip on open(), and now that doesn't happ= en.=20 The reset was harmful for some embedded uses, such as when the chip is used= in mpsse or bitbang mode. How is your rs485 transceiver connected to the ftdi? Is the transmitter connected to #TXDEN, and if so, are you using the eeprom to reconfigure that pin from RI to TXDEN? Is the receive side squelched in hardware (as sugges= ted in the ftdi datasheet, or otherwise) when the transmit side is active? --=20 You are receiving this mail because: You are the assignee for the bug.=