RE: nRF52840 on nRF9160-DK and Softdevice S140

Edvin — Wed, 23 Mar 2022 22:03:20 GMT

Hello,

[quote user=""]I have confirmed that when I write the Sotfdevice it shows "Device is protected", is this related?[/quote]

Yes, that may very well be related.

Do you have nRF Command Line Tools installed? If so, you can use the command "nrfjprog --recover" when the debugger is connected to the nRF52840 to turn off the readback protection.

Disclaimer:

The nRF52840 on the nRF91DK is not intended for "normal use". It acts as a board controller for the nRF91 DK, and the rest of the board will not work as normal if you program a custom application on the nRF52840 on the nRF91 DK. It is probably possible to program the original application to the nRF52840 at a later point in time, but I am not sure what is programmed on it when it is shipped (since I don't typically work with the nRF91 series).

However, it is technically possible to program the softdevice on the nRF52 on the nRF91-DK, and you can probably run a simple BLE application from there, but if you expect to use a lot of GPIOs, they will not be routed out to the LEDs and buttons or the GPIO headers on the board. If you want to use this, I recommend that you try to get hold of an nRF52840 DK instead.

Best regards,

Edvin