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OA47

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Joined: 11/04/2012
Location: Australia
Posts: 986

Posted: 03:03am 02 Jun 2021

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Have a project that uses the CH340 USB-Serial interface between PC and project. This has been very reliable up until recently where the serial port would be lost and the program had to be reset and restarted. I did a bit of inet reading and a couple of people mentioned that they had similar problems until upgrading the CH340 driver. I hunted high and low and couldn't find a more recent driver for the 2019 version I had on the Windows 10 PC. Out of desperation I hunted and found an earlier version dated 2011 and when I installed it everything was good again. This lasted a couple of days and the trouble resurfaced. Doing some detective work it seemed that the serial port was lost exactly 8 minutes after the program started so I was convinced that the issue was with the PC caused by some timer in Windows 10. Looking at the driver revealed that Microsoft updates had in its wisdom replaced the 2011 driver with the 2019 version which has the issue. Re-installing the 2011 version fixed the issue and telling Windows 10 not to update drivers when doing other updates hopefully will keep the peace.

Thought I would share this experience so that hair pulling out may be minimized.

OA47

Frank N. Furter
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Joined: 28/05/2012
Location: Germany
Posts: 949

Posted: 08:01am 02 Jun 2021

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Quote and telling Windows 10 not to update drivers

How did you do that? I have a similar problem...

Frank

OA47

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Joined: 11/04/2012
Location: Australia
Posts: 986

Posted: 08:24am 02 Jun 2021

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Frank, there are two methods, one for win 10 PRO using the Group Policy Editor and one for win 10 Home by adding a Registry entry.

I think this link describes them both:
How to disable driver updates on Win 10

All the Best
OA47
Edited 2021-06-02 18:26 by OA47

Frank N. Furter
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Location: Germany
Posts: 949

Posted: 06:30pm 02 Jun 2021

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THANK YOU VERY MUCH!!!

Frank

vegipete

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Joined: 29/01/2013
Location: Canada
Posts: 1132

Posted: 08:29pm 02 Jun 2021

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I often have a similar problem with a (clone?) Prolific USB-Serial interface. I often have to force Win10 back to an older driver version:

I'll check that link to see if it makes the old driver stick for good.

Visit Vegipete's *Mite Library for cool programs.

TassyJim

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Joined: 07/08/2011
Location: Australia
Posts: 6283

Posted: 10:09pm 02 Jun 2021

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No trouble here latest W10 update and CH340 in daily use

Jim

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OA47

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Joined: 11/04/2012
Location: Australia
Posts: 986

Posted: 10:31pm 02 Jun 2021

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Quote No trouble here latest W10 update and CH340 in daily use

Jim which Windows 10 build do you have 20H2 or 21H1?

OA47

OA47

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Joined: 11/04/2012
Location: Australia
Posts: 986

Posted: 10:32pm 02 Jun 2021

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Quote THANK YOU VERY MUCH!!!

Frank your welcome

OA47

TassyJim

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Joined: 07/08/2011
Location: Australia
Posts: 6283

Posted: 10:35pm 02 Jun 2021

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OA47 said

Quote No trouble here latest W10 update and CH340 in daily use

Jim which Windows 10 build do you have 20H2 or 21H1?

OA47

Edition Windows 10 Home
Version 21H1
Installed on 10/06/2020
OS build 19043.985
Experience Windows Feature Experience Pack 120.2212.2020.0

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