Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753840AbbH0I1M (ORCPT ); Thu, 27 Aug 2015 04:27:12 -0400 Received: from mail-yk0-f182.google.com ([209.85.160.182]:34532 "EHLO mail-yk0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753788AbbH0I1D (ORCPT ); Thu, 27 Aug 2015 04:27:03 -0400 MIME-Version: 1.0 In-Reply-To: <20150827073759.GC32712@localhost> References: <20150826170440.GB28324@localhost> <20150826180930.21386.qmail@stuge.se> <20150826181505.GA32712@localhost> <20150827073759.GC32712@localhost> Date: Thu, 27 Aug 2015 13:57:01 +0530 Message-ID: Subject: Re: Likely issue with ch341 kernel-module/driver From: Ajay Garg To: Johan Hovold Cc: Peter Stuge , linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1077 Lines: 39 Hi John. On Thu, Aug 27, 2015 at 1:07 PM, Johan Hovold wrote: > > Try to see if you can get the device to work reliably with some other > driver (vendor driver or other OS) to rule out a broken device. > I tested the serial-usb adapter using a loopback-hardware-tool (confirmed to be perfect). Using this, I see what I type, echo it back, and see what I receive. The putty session-settings are standard one - 9600, 8N-1, no parity. The byte flow is putty-on-laptop => usb-interface => serial-interface => loopback => serial-interface => usb-interface => putty-on-laptop. Thereafter, following are the echo-sequences I see :: a ==> 0 b ==> ' c ==> N This (I guess) confirms a problem on (at least) the driver-side. Thanks everyone for the quick replies so far, I am grateful. Thanks and Regards, Ajay -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/