Read/Write network core registers from application core

RE: Read/Write network core registers from application core

JONATHAN LL — Wed, 13 Oct 2021 10:22:13 GMT

[quote user="nvelozsavino"]Where's the hci_rpmsg source code? [/quote]

zephyr/samples/bluetooth/hci_rpmsg is the location.

[quote user="nvelozsavino"]How can we create a project that compiles a custom child image?[/quote]

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

RE: Read/Write network core registers from application core

nvelozsavino — Wed, 13 Oct 2021 08:08:56 GMT

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?

RE: Read/Write network core registers from application core

JONATHAN LL — Fri, 08 Oct 2021 08:53:14 GMT

We do have the radio test example, I recommend that you use that.

Radio test — nRF Connect SDK 1.7.0 documentation (nordicsemi.com)

sdk-nrf/samples/peripheral/radio_test at v1.7.0 · nrfconnect/sdk-nrf (github.com)

Regards,
Jonathan

RE: Read/Write network core registers from application core

nvelozsavino — Wed, 06 Oct 2021 12:12:42 GMT

The device is a medical device, it seems the certification process requires to change these parameters to evaluate the impact on the body. I think in normal operation we won't allow to modify the frequency parameter. so it should be for certification purposes only. Is there a way to change this value with an API like the TXPOWER?

RE: Read/Write network core registers from application core

JONATHAN LL — Wed, 06 Oct 2021 09:07:55 GMT

Hi,

What is the goal, if you could explain what you are trying to to then maybe I could provide some better info. Is the goal to do PHY updates ?

There is a TXPOWER HCI command
https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/samples/bluetooth/hci_pwr_ctrl/README.html

Regards,
Jonathan

RE: Read/Write network core registers from application core

nvelozsavino — Tue, 05 Oct 2021 12:13:19 GMT

Ok, I want to avoid modifying the hci_rpmsg image, I only need to access (read and write) 2 registers:

From FREQUENCY (0x41008508) we need and write FREQUENCY field

and from TXPOWER (0x4100850C) we would like to read and write the TXPOWER field

Is there a way to read/write these parameters using an already existing API?

RE: Read/Write network core registers from application core

JONATHAN LL — Tue, 05 Oct 2021 11:16:14 GMT

Hi,

I am not able to find anything that seems to work the way you want, I believe you will have to modify the hci_rpmsg sample.

Here are some links with relevant info:

https://infocenter.nordicsemi.com/topic/ps_nrf5340/chapters/soc_overview/doc/soc_overview.html?cp=3_0_0_2_0#blockdiagram

Data transfer between APP core and Net core. - Nordic Q&A - Nordic DevZone - Nordic DevZone (nordicsemi.com)

nRF53/nrfx: How to do Inter Processor Communication? - Nordic Q&A - Nordic DevZone - Nordic DevZone (nordicsemi.com)

Access network core registers from app core - Nordic Q&A - Nordic DevZone - Nordic DevZone (nordicsemi.com)

Regards,
Jonathan