Differences in RADIO register sets between nRF52 and nRF54

RE: Differences in RADIO register sets between nRF52 and nRF54

rbence — Mon, 01 Sep 2025 15:17:50 GMT

In case this is relevant for anyone:
If you were not using fast ramp-up in your nRF52 project, don't forget to explicitly turn off fast ramp-up mode with NRF_RADIO->TIMING = 0x0 the nRF54L, because for nRF52 at reset it is set to normal ramp-up, while for the nRF54L the default is fast ramp-up. (It took me a few hours to find this :) )

RE: Differences in RADIO register sets between nRF52 and nRF54

loquat — Thu, 28 Nov 2024 03:32:44 GMT

Thanks.

Now it works properly.

RE: Differences in RADIO register sets between nRF52 and nRF54

Sigurd — Tue, 26 Nov 2024 12:24:01 GMT

[quote user="loquat"]It seems that this implementation does not set DATAWHITE correctly.[/quote]

Thanks for reporting this! I have reported the bug to the nrfx developers.

RE: Differences in RADIO register sets between nRF52 and nRF54

loquat — Tue, 26 Nov 2024 03:50:01 GMT

Thanks.

In addition, the whitning register (DATAWHITE) also seems to be different.
Also, nrf_radio_datawhiteiv_set() in nrf_radio.h is implemented as follows.

NRF_STATIC_INLINE void nrf_radio_datawhiteiv_set(NRF_RADIO_Type * p_reg, uint8_t datawhiteiv)
{
#if defined(RADIO_DATAWHITEIV_DATAWHITEIV_Msk)
    p_reg->DATAWHITEIV = (((uint32_t)datawhiteiv) & RADIO_DATAWHITEIV_DATAWHITEIV_Msk);
#else
    p_reg->DATAWHITE &= ~RADIO_DATAWHITE_IV_Msk | (((uint32_t)datawhiteiv << RADIO_DATAWHITE_IV_Pos)
                                                   & RADIO_DATAWHITE_IV_Msk);
#endif
}

It seems that this implementation does not set DATAWHITE correctly.

RE: Differences in RADIO register sets between nRF52 and nRF54

Sigurd — Sun, 24 Nov 2024 23:11:05 GMT

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."

RE: Differences in RADIO register sets between nRF52 and nRF54

loquat — Sat, 23 Nov 2024 02:28:19 GMT

OK.

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

RE: Differences in RADIO register sets between nRF52 and nRF54

Sigurd — Fri, 22 Nov 2024 18:29:43 GMT

[quote user="loquat"]Please let me know if there are any other points I should be aware[/quote]

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()

RE: Differences in RADIO register sets between nRF52 and nRF54

loquat — Fri, 22 Nov 2024 14:59:26 GMT

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

RE: Differences in RADIO register sets between nRF52 and nRF54

Sigurd — Fri, 22 Nov 2024 14:38:14 GMT

[quote user="loquat"]However, it seems that the register sets are different between nRF52 and nRF54.[/quote]

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

RE: Differences in RADIO register sets between nRF52 and nRF54

loquat — Fri, 22 Nov 2024 14:21:36 GMT

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.

RE: Differences in RADIO register sets between nRF52 and nRF54

Sigurd — Fri, 22 Nov 2024 13:18:25 GMT

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