Differences in RADIO register sets between nRF52 and nRF54

[loquat]

I want to control RADIO using the TimeSlot API of nRF54L15.
I have already created the code for nRF52.
However, it seems that RADIO control of nRF54L15 is slightly different from nRF52.
Please tell me how to migrate. (DirectionFinding/ChannelSounding related settings are not required.)

[Sigurd]

Hi!

Not sure what problem you are having. We have a timeslot sample here, it works for both nRF52 and nRF54.

https://github.com/nrfconnect/sdk-nrf/tree/main/samples/mpsl/timeslot

[loquat]

Thanks.

This is a sample of the timeslot API, not a sample of RADIO operation.
I want to use the Timeslot API to control the RADIO device directly.
However, it seems that the register sets are different between nRF52 and nRF54.

[Sigurd]

loquat said:

However, it seems that the register sets are different between nRF52 and nRF54.

You can find the register for the radio here:

https://docs.nordicsemi.com/bundle/ps_nrf54L15/page/radio.html#d1149e2520

One change to be aware of is the new PHYEND event. In our radio test FW, we use this event instead of END event. See the code here: https://github.com/nrfconnect/sdk-nrf/blob/v2.8.0/samples/peripheral/radio_test/src/radio_test.c#L55

[loquat]

The differences I found are:
There is no POWER register (no need to set it?)
The TXPOWER setting value is different
The register name is the same but the offset value is different

Please let me know if there are any other points I should be aware

[Sigurd]

loquat said:

Please let me know if there are any other points I should be aware

If you are using fast ramp-up, then on the nRF52 this is done with the MODECNF0 register. On the nRF54L, this is done with the TIMING register. This change is handled automatically if you use e.g. the Radio HAL function nrf_radio_fast_ramp_up_enable_set()

[loquat]

OK.

When using the nRF54L15, is it not necessary to call nrf_radio_power_set()?
How is POWER controlled on the nRF54L15?

[Sigurd]

The RADIO POWER register on nRF52 is used to "reset the radio". From the register description "The peripheral and its registers will be reset to its initial state by switching the peripheral off and then back on again.".

On the nRF54L15, there is no POWER register, and it's now replaced by the new TASKS_SOFTRESET register, from the register description . "Reset all public registers, but with these exceptions: DMA registers and EVENT/INTEN/SUBSCRIBE/PUBLISH registers. Only to be used in DISABLED state."