From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263441AbTDGPWt (for ); Mon, 7 Apr 2003 11:22:49 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263470AbTDGPWt (for ); Mon, 7 Apr 2003 11:22:49 -0400 Received: from ns.javad.ru ([62.105.138.7]:55819 "EHLO ns.javad.ru") by vger.kernel.org with ESMTP id S263441AbTDGPWs (for ); Mon, 7 Apr 2003 11:22:48 -0400 To: Michael Buesch Cc: linux-kernel@vger.kernel.org Subject: Re: modifying line state manually on ttyS References: <200304071702.08114.freesoftwaredeveloper@web.de> X-attribution: osv From: Sergei Organov Date: 07 Apr 2003 19:34:25 +0400 In-Reply-To: <200304071702.08114.freesoftwaredeveloper@web.de> Message-ID: <87d6jyiany.fsf@osv.javad.ru> User-Agent: Gnus/5.0808 (Gnus v5.8.8) XEmacs/21.4 (Common Lisp) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Michael Buesch writes: > Hi. > > I have asked in many other mailing-lists, but I got no good > solution for my problem, so I try to ask here, although it may > not be the exaclty correct list for it. > > I have developed my own device, that is connected to ttyS0. > To talk to my device, I need to set the state of the TxD line > manually to either 0 or 1 (+12v or -12v). What I try to say is, > I don't want to write a whole byte to the port, but only one single > bit, that then stays persistent on the line, until I reset its state. > Better sayed, I want to handle TxD line, like it's possible for > DTR-line for example. Do ioctl(fd, TIOCSBRK, 0) / ioctl(fd, TIOCCBRK, 0) help? -- Sergei.