From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?iso-8859-1?Q?Chris_Dor=E9?= Subject: RE: Handling RTS Date: Mon, 14 Jan 2008 10:05:03 -0500 Message-ID: <005401c856be$d8db3a00$8a91ae00$@com> References: <008101c852ff$36201730$a2604590$@com> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Return-path: Received: from inetc.connecttech.com ([64.7.140.42]:4463 "EHLO inetc.connecttech.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750810AbYANPFW (ORCPT ); Mon, 14 Jan 2008 10:05:22 -0500 Received: from connecttech.com (cti2.connecttech.com [206.130.75.42]) by inetc.connecttech.com (8.13.3P/8.13.3) with ESMTP id m0EF5LUO018644 for ; Mon, 14 Jan 2008 10:05:21 -0500 (EST) (envelope-from cdore@connecttech.com) Received: from cdore ([206.130.75.122]) by connecttech.com (8.10.1/UW7.1.1-NSCd) with ESMTP id m0EF55V02939 for ; Mon, 14 Jan 2008 10:05:05 -0500 (EST) In-Reply-To: Content-Language: en-ca Sender: linux-serial-owner@vger.kernel.org List-Id: linux-serial@vger.kernel.org To: linux-serial > From: linux-serial-owner@vger.kernel.org [mailto:linux-serial- > owner@vger.kernel.org] On Behalf Of JZabalza@cemitec.com > Sent: January 10, 2008 3:27 AM > To: linux-serial > Subject: RE: Handling RTS > > Thanks for your response. I have a PC, so dmesg said > > serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A > > How I said, I just handle RTS but from userland. This means a big > latency between RTS activation and begin out data. I want only reduce this > latency activating RTS on driver. My question is, is this *protocol* > implemented actually or I must implement them. I'm not an expert on the current 8250 driver, but I believe you will have to implement your 485 control. We may have done this in one of our drivers, but in my quick search I can't find one that doesn't take advantage of the extra features supplied by the UARTs we use. Best of luck, Chris