Read/Write network core registers from application core

[nvelozsavino]

How can I read and/or write registers belonging to the Network core from the application core. I would like to do it without modifying the hci_rpmsg that is built by default. Is there a hci api to do this?

[nvelozsavino]

But that replace the entire hci_rpmsg child image, in fact that sample doesn't even use the application core. What we need is to use the current hci_rpmsg image in the network core and add the capabiliy to modify the registers from the Application core.

Where's the hci_rpmsg source code? 
How can we create a project that compiles a custom child image?

[JONATHAN LL]

nvelozsavino said:

Where's the hci_rpmsg source code? 

zephyr/samples/bluetooth/hci_rpmsg is the location. 

nvelozsavino said:

How can we create a project that compiles a custom child image?

First, open a command prompt in the build folder of the network sample and enter the following command to erase the flash memory of the network core and program the network sample:

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

Then navigate to the build folder of the application sample and enter the following command to erase the flash memory of the application core and program the application sample:

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

Finally, reset the development kit:

nrfjprog --pinreset

You can build app core and net core separately and flash with nrfjprog. 

 Regards,
Jonathan