SEGGER J-Link OB - How to disable it on nRF53-DK

[Gabriele]

Hi,
When I hook the nRF5340-DK board to my PC, the SEGGER J-Link OB debug chip bothers me popping up a GUI that exposes the board as a USB mass storage device.
How to get it disabled persistently ?

BR

[Priyanka]

Hi Gabriele,

You could disconnect the Interface MCU from the power domain. But you could also disable the USB lines between the USB port and the J-Link device, but this might leave the USB lines in an undefined state. Do you want to power only the nRF chip on the DK? That is possible by changing the SW10 (switch) on the DK to nRF Only.

Regards,

Priyanka

[Gabriele]

Hi Priyanka,
I prefer the following "soft" solution

1. Connect the J-Link-OB target to PC
2. Start J-Link Commander
3. execute the command
J-Link > msddisable
4. Quit J-Link Commander

In order to restore the MSD functionality, the command is 'msdenable'

[Priyanka]

Hi Gabriele,

Glad that it works for you and thanks for letting us know.

-Priyanka