The nRF52840 dongle can no longer be accessed after flashing hex file

RE: The nRF52840 dongle can no longer be accessed after flashing hex file

Frank — Fri, 19 Oct 2018 06:58:11 GMT

Hi zsnave,

I had a much better look at the dongle, and it seems I pushed the wrong button so far.

The "extremely small" reset button is next to the big WHITE button that I wrongly thought was the reset button, despite I looked at the Nordic documentation... Yeah with aging the eyes don't improve so I missed the small button in front of the big white one!

Thanks for putting my attention/FOCUS back to the RESET button, however I thought the dongle would always be seen by the device manager also when it is not in DFU booting mode.

The first time you plug it into the USB port no firmware is present and so it is by default in DFU booting mode, and lights up the red LED in blinking mode .

The moment firmware is flashed into it, it seems the USB dongle is no longer visible in the device manager of Windows... .

However I'm wondering if additional drivers are not missing...

Before flashing the hex, I saw something different than SDFU, and also in the nRFConnect desktop applic a Nordic annotation was present, it was more than just Serial port COMM10.

Best regards,

Frank

RE: The nRF52840 dongle can no longer be accessed after flashing hex file

Frank — Fri, 19 Oct 2018 06:24:08 GMT

Hi zsnave,

Indeed this should be the solution but it does not do that anymore, when pressing the RESET button on the dongle the red LED doesn't start to blink anymore. I don't think the dongle is broken as the key press is detected in the nRFConnect app running on a smartphone when connected via BT. As described also the red and green led can be activated via the nRFConnect app on the smartphone.

I plugged the dongle in other USB ports and also in a different PC running Windows 10 but the nRF52 dongle is no LONGER detected by the Windows OS. In the Windows Device manager the dongle is no longer listed.

So when it is not detected the nRFConnect desktop applic is not able to see it do any firmware upload anymore. A

I have done plenty of stuff but so far without any succes, example, removed the Nordic USB drivers, re-installed them via installing back the nRFConnect applic.

Also the Zadig applic doesn't see the device anymore to install a generic Windows USB driver.

So it seems after uploading (via the Programming applic from the nRFConnect suite) the blinky applic from the SDK v15, latest version, the dongle is somewhat bricked.

Anyhow thanks for replying.

Best regards,

Frank

RE: The nRF52840 dongle can no longer be accessed after flashing hex file

zsnave — Thu, 18 Oct 2018 18:55:26 GMT

Gotta press the reset button to get the boot loader backup and running again. LED2 should then pulsate red. Run RfConnect and then try again connecting to it.

RE: The nRF52840 dongle can no longer be accessed after flashing hex file

Frank — Thu, 18 Oct 2018 15:56:12 GMT

UPDATE: some additional information

On the nRFConnect APP I can see that via the Nordic LED button service, the RESET button is pressed or released.

Via the button on/off value the green/red led can be switched on/off.

But no longer visible as "COM" device in the nRFConnect desktop applic or in the Windows Device Manager.