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]

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."

[loquat]

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.

[Sigurd]

loquat said:

It seems that this implementation does not set DATAWHITE correctly.

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

[loquat]

Thanks.

Now it works properly.

[rbence]

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 :) )