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Date: Thu, 27 Aug 2015 11:45:49 +0200 From: Johan Hovold <johan@...nel.org> To: Ajay Garg <ajaygargnsit@...il.com> Cc: Johan Hovold <johan@...nel.org>, Peter Stuge <peter@...ge.se>, linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org Subject: Re: Likely issue with ch341 kernel-module/driver On Thu, Aug 27, 2015 at 01:57:01PM +0530, Ajay Garg wrote: > Hi John. > > On Thu, Aug 27, 2015 at 1:07 PM, Johan Hovold <johan@...nel.org> 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. Not unless you confirm that the same setup works when using a different driver, right? Otherwise, it could still be a hw issue. Johan -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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