nRF52 DK not detected through USB

[emlynkz]

Hi,

after having issues with my devkit flashing the main MCU, the interface MCU isn't being seen on USB anymore.

LED5 is blinking rapidly.

 nrf52 DK keeps resecuring itself 

The board is a PCA10040 v3.0.4 with the nRF5340 as interface MCU.

All the documentation is only about the older version with the Atmel MCU, which can be recovered with its bootloader.

Is a similar thing possible with the v3.x and up?

I have access to other devkits and programmers.

Thanks!

Étienne Machabée

Lynkz Instruments Inc.

[PaKa]

Fast blinking LED5 means the DK doesn't see the USB host. Check the cable and the connection to the PC. Try other cables/ports on PC to ensure you are connected. And you have plugged the cable into the USB connector on the short end of the DK?

[emlynkz]

I have tried other PCs, other cables and I have other DKs to check. They all work on the cables and PCs I've tried with.

I used to run this devkit powered on with a power-only cable in a prototype. This is after running it for a couple hours like that that it stopped working when I'm plugging it into a PC.

Since this is a nRF52 DK there's only one USB port so I'm plugged into the right one.