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    No COM detected after connecting to PC

    Core 2
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    • ajb2k3A
      ajb2k3 @Juraj
      last edited by

      @Juraj Is the core2 charged?

      UIFlow, so easy an adult can learn it!
      If I don't know it, be patient!
      I've ether not learned it or am too drunk to remember it!
      Author of the WIP UIFlow Handbook!
      M5Black, Go, Stick, Core2, and so much more it cant be fit in here!

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      • J
        JourneymanWizard @Juraj
        last edited by

        @Juraj I can share my issue and solution using an M5Core3SE and a Win11 computer.

        When I connected the M5 to the USB-A port on the PC using a USB-A to USB-C cable, I got power, but no COM ports.

        When I connected the M5 to the USB-C port on the PC (using a USB-C to USB-C cable), BOOM: COM port.

        I haven't dug into it to see particularly why (best guess right now is the M5 connection uses both the legacy USB 2.0 connection as well as the SuperSpeed connection: one for the terminal and one for the M5 program data stream?)

        Hope this helps.

        robskiR ajb2k3A 2 Replies Last reply Reply Quote 1
        • robskiR
          robski @JourneymanWizard
          last edited by

          @JourneymanWizard said in No COM detected after connecting to PC:

          @Juraj I can share my issue and solution using an M5Core3SE and a Win11 computer.

          When I connected the M5 to the USB-A port on the PC using a USB-A to USB-C cable, I got power, but no COM ports.

          When I connected the M5 to the USB-C port on the PC (using a USB-C to USB-C cable), BOOM: COM port.

          I haven't dug into it to see particularly why (best guess right now is the M5 connection uses both the legacy USB 2.0 connection as well as the SuperSpeed connection: one for the terminal and one for the M5 program data stream?)

          Hope this helps.

          so you are using 2 different cables and its ok on just one...no issue with pc, no issue with M5..check with dofferent A to C USB

          M5StickC, M5StickCPlus, M5StickCplus2,M5GO, M5Core, M5Tough, M5Core2, M5 Demo Board, M5Dial, M5Paper, M5Atom, M5Cardputer, M5StampS3, CoreMP135, StamPLC, AirQ, M5Tab

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          • ajb2k3A
            ajb2k3 @JourneymanWizard
            last edited by

            @JourneymanWizard The USB A cable is power only not a data cable.

            UIFlow, so easy an adult can learn it!
            If I don't know it, be patient!
            I've ether not learned it or am too drunk to remember it!
            Author of the WIP UIFlow Handbook!
            M5Black, Go, Stick, Core2, and so much more it cant be fit in here!

            1 Reply Last reply Reply Quote 0
            • J
              JourneymanWizard
              last edited by

              @robski I tried multiple cables. Every USB-A to USB-C cable failed, some of which I had used in the past for data transfer. I am only using 1 cable: USB-C to USB-C

              @ajb2k3 To clarify: are you saying that somewhere in the Core3SE documentation it says that USB-A is power only? Could you link that or point me to it? I clearly need to dig into the hardware a bit more :)

              ajb2k3A 1 Reply Last reply Reply Quote 0
              • ajb2k3A
                ajb2k3 @JourneymanWizard
                last edited by ajb2k3

                @JourneymanWizard No, I'm saying that not all cables are power+data. some cables are data only.
                Also for some reason I have noticed that cables of late have a high failure rate (conductors breaking.
                You are a core3, Have you pressed the boot button?
                Another thing I have also noticed that I have to use a USB hub between the device and the computer for some reason.

                UIFlow, so easy an adult can learn it!
                If I don't know it, be patient!
                I've ether not learned it or am too drunk to remember it!
                Author of the WIP UIFlow Handbook!
                M5Black, Go, Stick, Core2, and so much more it cant be fit in here!

                1 Reply Last reply Reply Quote 0
                • konacurrentsK
                  konacurrents
                  last edited by

                  No COMM with USB-A cable

                  Recently with the M5Atom, only the USB-C to USB-C cable from my MacBook is recognized as a valid PORT. If using USB-A the port will not show up.

                  Some teammates were trying to just use the Serial Monitor- and did not have the USB C - USB C cable. Although in this case, they say the PORT shows up, but is just not selectable. I haven't seen that - it just doesn't show up for me.

                  I have tried many different USB-A to USB-C cables, and none work.

                  It would be nice for M5Stack to chime in and let us know what works.

                  robskiR 1 Reply Last reply Reply Quote 0
                  • robskiR
                    robski @konacurrents
                    last edited by

                    so your setup is:
                    Mac --- usb A to C cables --- M5Atom

                    does Atom works on diff machine? I mean non Mac

                    M5StickC, M5StickCPlus, M5StickCplus2,M5GO, M5Core, M5Tough, M5Core2, M5 Demo Board, M5Dial, M5Paper, M5Atom, M5Cardputer, M5StampS3, CoreMP135, StamPLC, AirQ, M5Tab

                    konacurrentsK 1 Reply Last reply Reply Quote 0
                    • konacurrentsK
                      konacurrents @robski
                      last edited by konacurrents

                      @robski I did some testing. When the USB-A is plugged into a PC (com4) it definitely works - is recognized, etc. But using that same cable (and a couple others) the M5Atom is NOT recognized on the MacBook (sometimes).

                      A teammate still cannot get the USB-A to work on her MacBook. (I'll mention the dongle issue stated below).

                      Now for the strange part: After testing the PC, I plugged the same USB-A into my Mac and it was working. So I thought the PC somehow altered the M5Atom.
                      But trying a brand new M5Atom - it works on PC, but not on the MacBook. (So that altered theory was debunked).

                      It's strange that looking at a post here from 2020 - the problem was reversed: the USB-A was the only one that worked on MacBook.

                      UPDATE different dongle works

                      I just tried a non apple dongle, and it is working. Most interesting.

                      UPDATE 2: apple dongle works sometimes

                      Strange, after working with that non-apple dongle, I re-tried the apple dongle,
                      and it works now (on this M5Atom).

                      SO it's not a uniform problem.

                      Maybe the MacBook get's woken up after and recognizes that device once. I just tried a brand new M5Atom - and it didn't recognize it. Then started to recognize.

                      robskiR 1 Reply Last reply Reply Quote 0
                      • robskiR
                        robski @konacurrents
                        last edited by

                        @konacurrents any mac related drivers missing by chance?

                        M5StickC, M5StickCPlus, M5StickCplus2,M5GO, M5Core, M5Tough, M5Core2, M5 Demo Board, M5Dial, M5Paper, M5Atom, M5Cardputer, M5StampS3, CoreMP135, StamPLC, AirQ, M5Tab

                        1 Reply Last reply Reply Quote 0
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