Not possible to do anything with my nrf52840 USB dongle

[darrepac]

Hello,

I bought a NRF52840 USB Dongle for evaluation purpose (bigger project in mind).

I cannot even run the demo from NRF Connect (like BLE or RSSI viewer)!

On my PC I have the following error which has no solution ( nRF Connect for Desktop BLE making Minified React error )

So I tried on my laptop, I don't have the error but when I launch BLE demo from nrf connect (latest version) it tells me "Device must be programmed, do you want to proceed?"

I say yes but then there is an error in the log: "failed to write to the targeted device.... serial port cannot be opened" and the application is stuck.

I have nothing running on my PC... may-be the serial port is not active by default?? (I see it in device manager yet)

The same happen when I try to use the programmer (from nrf connect) to flash another softdevice:

"Failed with exit code 1. One or more program tasks failed: * E37C93A3B11D: [sdfu] serialport could not be opened, code: FileOpenFailed. Message: Failed, [sdfu] serialport could not be opened."

So there is here a problem of serial port than I cannot see how to fix (I tried to use process explorer to see if an other app is using the serial port, but it isn't the case)

thanks for any hint.

[Kenneth]

Hello,

For various reasons I recommend to get yourself an nRF52840-DK, for instance the ability to debug your project and have access to all gpios etc.

When using the nRF52840 USB dongle you may find this useful:  nRF52840 Dongle Programming Tutorial For instance it describes how you can program the nRF52840 USB dongle in the "Program application using nRF Connect Programmer" chapter.

As to your current problem:

I say yes but then there is an error in the log: "failed to write to the targeted device.... serial port cannot be opened" and the application is stuck.

What I have seen in the past, is that even if it says fails, you may try to plug out and in the dongle again, to check if it may actually have been programmed.

Kenneth