How to flash code to application and network cores on nrf5340dk?

RE: How to flash code to application and network cores on nrf5340dk?

Marte Myrvold — Wed, 06 Apr 2022 11:48:11 GMT

Hi,

Yes, the application core starts up the network core and connects its GPIO pins. So even if you make firmware for the network core only you still need to program the application core. You can use the Empty firmware for application core for this, for example by configuring this as a child image of your network core application. For more information on how to do this you can check out Working with nRF5340 DK » Direct use of the radio peripheral.

Best regards,

Marte

RE: How to flash code to application and network cores on nrf5340dk?

Pelle — Wed, 06 Apr 2022 08:31:41 GMT

Ok thanks, it seems to work to flash both cores now!

But do I need to start up the network core somehow? I read about a "force off" signal that should be released?

Because I try to toggle some LEDs on the nrf5340dk devboard from network core but nothing happens

RE: How to flash code to application and network cores on nrf5340dk?

Marte Myrvold — Wed, 06 Apr 2022 06:31:36 GMT

Hi,

You must specify that you are programming the network core:

nrfjprog -f NRF53 --coprocessor CP_NETWORK --program zephyr/zephyr.hex --chiperase

Best regards,

Marte