COM port is already in use. Cannot proceed.

Question

COM port is already in use. Cannot proceed.

Domosapiens opened this issue 6 years ago · 18 comments

On WIN7 this is the log:

DONE!
(You may disconnect the unit if you want.)
COM port is already in use. Cannot proceed.
Adding settings using SERIAL commands.
Flashing done (76.4s).
Start flashing on COM18 (This might take a minute or two...)

Any idea how to deal with this?

Answer 1 · 2018-09-18T19:19:21.000Z

Sometimes you may need to do a manual reboot after the flash. Have you tried that?

Answer 2 · 2018-09-19T21:36:33.000Z

Will try at the next occasion. Thanks

Answer 3 · 2018-10-29T23:52:02.000Z

@Grovkillen
Manual reboot does not solve it -- COM port is already in use. Cannot proceed
Re-connect does not solve it -- COM port is already in use. Cannot proceed
Re-connect and then: Program only -- COM port is already in use. Cannot proceed
Re-connect and then: Open serial monitor -- COM port is already in use. Cannot proceed
Please advice (for WIN7)
5 units are hungry for the latest release

Answer 4 · 2018-10-30T19:19:36.000Z

That is really weird! I can only reproduce this if I have the serial monitor active or if the app has crashed before and is still keeping the port open... have you looked through the processes?

Answer 5 · 2018-11-01T06:07:18.000Z

Is this still an issue?

Answer 6 · 2018-11-01T22:04:55.000Z

@Grovkillen There is 1 ESP.Easy.Flasher.exe process running
Are there other processes I have to look for?

Flashing goes well, but post flash action fails.
So there is initial a correct connection between the app and the ESP for flash.

If I restart the app and go directly to Program only: the COM port is already in use.

Disconnect, connect the USB, removes and creates USB-Serial CH340 (COM21).
That one is recognized in the app.
When I push "Program only" I see shortly a new process dllhost.exe *32 COM surrogate
in addition to the dllhost.exe COM surrogate (without *32) that is running all the time, with and without the USB plugged.

Does one of above ring any bell for you?

Answer 7 · 2018-11-01T22:06:36.000Z

I will look into that. Could be some dependences not working correctly in your environment. Den tors 1 nov. 2018 23:04 skrev Domosapiens <notifications@github.com>:

…

@Grovkillen <https://github.com/Grovkillen> There is 1 ESP.Easy.Flasher.exe process running Are there other processes I have to look for? Flashing goes well, but post flash action fails. So there is initial a correct connection between the app and the ESP for flash. If I restart the app and go directly to Program only: the COM port is already in use. Disconnect, connect the USB, removes and creates USB-Serial CH340 (COM21). That one is recognized in the app. When I push "Program only" I see shortly a new process dllhost.exe *32 COM surrogate in addition to the dllhost.exe COM surrogate (without *32) that is running all the time, with and without the USB plugged. Does one of above ring any bell for you? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#8 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AZeBYivBd7u5GIE80lZIi5fTBHtrWVDgks5uq3AIgaJpZM4WqTXO> .

Answer 8 · 2019-01-23T06:37:15.000Z

Please update to 0.04.003 and report back here if this still is an issue.

Answer 9 · 2019-03-26T17:37:14.000Z

Using 0.04.007 and still an issue, using WIN10.
Tried running as administrator also no difference, flashing goes well!

Answer 10 · 2019-04-05T19:54:45.000Z

same problem(((

Answer 11 · 2019-04-24T14:58:15.000Z

Just ran into the same problem.
Got it working since I opened up the Serial Monitor. After that it doesn't work anymore.
Tried reboot without success.
Any updates on this?

Answer 12 · 2019-05-05T12:14:59.000Z

Same issue here, used several board and flash tools.
On two different computers

Answer 13 · 2019-06-09T00:31:11.000Z

Same issue - with Win7 and (0.04.007)

Answer 14 · 2020-01-23T13:00:41.000Z

Ran into the same problem.
Using 0.04.007 and WIN10.
Tried running as administrator also no difference, flashing goes well!
Still same issue,
COM port is already in use. Cannot proceed.

Answer 15 · 2020-05-02T20:33:59.000Z

Hello and thx for your great Software !
Same Problem for me here: "COM port is already in use. Cannot proceed"
Occurs after flashing with "post flash action" checked but also when just using "program only" or even when trying to open the Serial Monitor.
Only one instance running.
OS: Win10 x64
Version of Software: 0.04.007 and older versions too

Answer 16 · 2020-12-29T19:26:35.000Z

I seem to be having the same issue.
Even just a straight "program" after a flash and esp reboot "COM port is already in use. Cannot proceed."
Tried as admin

Answer 17 · 2020-12-30T15:09:50.000Z

Yep I totally get the bug here, and I'm currently working on a better flasher tool which doesn't require you to download an exe and it will work on most types of host systems (may it be PC, tablet, phone or Chromebook). // Jimmy Westberg 0706505709 ٩(- ̮̮̃-̃)۶ Den 2020-12-29 20:26:48 skrev Nygel Lyndley <notifications@github.com>: I seem to be having the same issue. Even just a straight "program" after a flash and esp reboot "COM port is already in use. Cannot proceed." Tried as admin — You are receiving this because you modified the open/close state. Reply to this email directly, view it on GitHub [#8 (comment)], or unsubscribe [https://github.com/notifications/unsubscribe-auth/AGLYCYTE4YABUAWRRJRZMXTSXIUPRANCNFSM4FVJGXHA].

Answer 18 · 2021-04-11T12:26:24.000Z

Not a recent thread, but as it helped me today, I just share that all issues encountered when uploading firm on Sonoff where solved by :

using a powered hub and short connections between USB-to-serial key and Sonoff PCB
lauching ESP.Easy.Flasher.exe in admin mode (W7+ESP flasher 0.04.007)

With these two 'rules', upload runs correctly from begin to end.

If this can help somebody !