How to configure peripheral to use HFXO exclusively in NRF Connect SDK

RE: How to configure peripheral to use HFXO exclusively in NRF Connect SDK

Håkon Alseth — Tue, 14 Feb 2023 15:32:40 GMT

[quote user="edmcnicholas"]I have confirmed that using this the radio can not turn off my use of the clock.[/quote]

That is good to hear.

Kind regards,

Håkon

RE: How to configure peripheral to use HFXO exclusively in NRF Connect SDK

edmcnicholas — Tue, 14 Feb 2023 12:13:30 GMT

I will look into that but my client had a demo this week so I had to use what worked. The nrfx clock api has an underlying semaphore in the nrfx_clock_start(NRF_CLOCK_DOMAIN_HFCLK) in nrfx_clock.h call when requesting the clock so this would make me believe this is the code that makes the clock api work. I have confirmed that using this the radio can not turn off my use of the clock.

RE: How to configure peripheral to use HFXO exclusively in NRF Connect SDK

Håkon Alseth — Tue, 14 Feb 2023 11:17:27 GMT

Then I would strongly recommend that you switch to using the clock control API instead:

[quote user="hkn"]

In NCS, clock configuration is handled by the "clock control" driver, and can be requested using this API:

https://github.com/nrfconnect/sdk-nrf/blob/main/samples/peripheral/radio_test/src/main.c#L11-L41

[/quote]

This is to avoid scenarios where other modules, such as the radio, leaves the HFCLK stopped afterwards.

Kind regards,

Håkon

RE: How to configure peripheral to use HFXO exclusively in NRF Connect SDK

edmcnicholas — Tue, 14 Feb 2023 11:11:59 GMT

I am using ncs 2.0. I am using the nrfx clock api

RE: How to configure peripheral to use HFXO exclusively in NRF Connect SDK

Håkon Alseth — Tue, 14 Feb 2023 10:23:21 GMT

Are you using NCS or nRF5?

Regardless, the HFCLK is shared with the bluetooth stack (ie. either SoftDevice in nRF5 SDK, or SoftDeviceController in NCS), so you should use the same API to ensure that you get the wanted behavior.

Kind regards,

Håkon

RE: How to configure peripheral to use HFXO exclusively in NRF Connect SDK

edmcnicholas — Mon, 13 Feb 2023 14:08:22 GMT

I will look into this but after testing the nrfx clock code seems to work and gives me control i need at the nrfx level. Taking a brief look at that code I do not see how you request to enable and disable the HFXO for a peripheral

RE: How to configure peripheral to use HFXO exclusively in NRF Connect SDK

Håkon Alseth — Mon, 13 Feb 2023 11:50:39 GMT

Hi,

In NCS, clock configuration is handled by the "clock control" driver, and can be requested using this API:

https://github.com/nrfconnect/sdk-nrf/blob/main/samples/peripheral/radio_test/src/main.c#L11-L41

Given that your posts here indicate nRF5 SDK, this is the correct API to use when the SoftDevice is active:

[quote user="edmcnicholas"]

sd_clock_hfclk_request();

while (!is_running) {

sd_clock_hfclk_is_running(&is_running);

}

[/quote]

Kind regards,

Håkon

RE: How to configure peripheral to use HFXO exclusively in NRF Connect SDK

edmcnicholas — Fri, 10 Feb 2023 22:27:48 GMT

After digging I think this is the right api call can someone confirm.

nrfx_clock_hfclk_start();

while(nrfx_clock_hfclk_is_running() == false);

RE: How to configure peripheral to use HFXO exclusively in NRF Connect SDK

edmcnicholas — Fri, 10 Feb 2023 21:00:16 GMT

is there an nrf connect equivalent for this. The current code looks to be missing a counting semaphore to be able to override the radio turning off the hfxo

sd_clock_hfclk_request();

while (!is_running) {

sd_clock_hfclk_is_running(&is_running);

}