Consequently, the hardware connects to your PC through serial ports. Go to Control Panel → Uninstall a program and uninstall “Prolific” or “PL-2303 USB-to-Serial”, if it’s in there.Coolterm is an intuitive and adaptable terminal used for serial communication.Connect TotemDuino to a working PC and upload an empty sketch (to make sure it doesn’t send anything over Serial).I believe it didn’t show anything else after you took a screenshot? Because needed to wait a bit for that “ProlificSerial” to pop out.Īnd the last thing to try would be completely reinstall Prolific driver, but given it also doesn’t work with original Arduino - I doubt it will help. In your Process Explorer (first image), search hasn’t completed, because “Search” button is still greyed out.Probably not an expert enoughĪt least it was a good challenge and I believe you have advanced from a “newbie” level for sure Unfortunately I also getting out of options and from there it’s only a guessing game. I agree that this became more complicated than it should be. In Arduino forum I’ve found that a lot of people have had problems similar to mine but the solutions suggested didn’t work for me. So at the present I’m blocked and I’m eagerly waiting for your tutorial and suggestions I also disconnected all the devices connected to USB ports just leaving the Logitech unifying device for wireless keyboard and mouse but I do not think that it is responsible for the problem because in another older desktop with the same OS I have the same device and Arduino works fine. The strange fact is that whichever COM port I choose the error message is always "Access denied " as if something is blocking all the USB ports( that work without problems when I connect other devices such as scanner, printer, headphones, external drives, etc) and the same message appears when I try in Cool Term to connect the chosen COM port. However from what I’ve read on the web this shouldn’t interfere with the USB in this case. The XHCI ownership change should be claimed by XHCI driver” “This is a workaround for OSes without XHCI hand-off support. I opened the BIOS and checked for the USB configuration: I found that the only option disabled is XHCI Hand-off and, if i choose “enabled” I get a message I’ve just ended trying all the steps you suggested ( enabled the Bluetooth module, restarted the computer, reinstalled the Totemduino, changed the COM port) but nothing worked. If none of these helps - I will post one more tutorial to resolve issue, but “Change COM port” should do the job. In case still not working - try to restart PC. Prolific USB-to-Serial Comm Port with new selected port should be displayed.In COM Port Number select new free port (not in use).On Prolific USB-to-Serial Comm Port (COM3) select Properties → Port Settings → Advanced.Try to upload code trough Arduino again.On Prolific USB-to-Serial Comm Port (COM3) select Uninstall device.Simply restart computer and check if Arduino is able to upload code.So I will list a few ways to try resolve this issue: Restart computer ![]() Maybe some driver or process thinks, that Bluetooth is enabled and connects automatically to this port (which is TotemDuino). It’s common that Bluetooth creates “COM3” port. Also a bit suspicious - your Bluetooth module is disabled. Driver for TotemDuino is working fine, but some process in your computer is connected to COM3 port, that is why Arduino tells “Access denied”. USB 2.0 devices are compatible with 3.0 ports. Could this problem be related to the fact that on the desktop all the USB ports are 3.0 or 3.1
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