about CONFIG_ESB_FAST_SWITCHING

RE: about CONFIG_ESB_FAST_SWITCHING

Hieu — Tue, 04 Nov 2025 11:13:00 GMT

Hi Liny and Doris.chen,

My apologies for the lack of update.
The Fast Switching feature on the nRF54L15 Radio can be used to implement ESB Fast Switching, and it would help reducing TX-RX switching time.
However, ESB Fast Switching on the nRF54L15 isn't supported yet in the SDK. As mentioned before, I can't comment on when it will be implemented, and you will need to contact our Sales team for that.

If you need help getting in touch with a Sales representative, I can help with that.

Hieu

RE: about CONFIG_ESB_FAST_SWITCHING

Doris.chen — Mon, 03 Nov 2025 06:13:34 GMT

Any updates?
I'm also using this feature with NCS v3.1 on nRF54L15, and I'm wondering if enabling CONFIG_ESB_FAST_SWITCHING manually could help achieve faster transmission speed.
Currently, the TX/RX switching time seems too slow, so I’m looking for a way to improve it.

RE: about CONFIG_ESB_FAST_SWITCHING

Hieu — Sat, 11 Oct 2025 18:45:11 GMT

Hi Liny,

I can't comment on longrain's project due to unfamiliarity with it.

As for the ESB Fast Switching feature, I don't have the liberty to say anything about how much a feature has been investigated or developed or tested. Could you please have a word with your local Nordic sales contact?

I am out of office now but will return on Tuesday and look into your technical questions if they are applicable to the nRF54L15.

Hieu

RE: about CONFIG_ESB_FAST_SWITCHING

longrain — Sat, 11 Oct 2025 10:16:28 GMT

https://github.com/LRchangyu/nrf54l_radio

Check if this can help.

RE: about CONFIG_ESB_FAST_SWITCHING

Liny — Fri, 10 Oct 2025 12:25:32 GMT

Regarding the first point, I would like to inquire: is the radio fast switching feature completely unavailable on the nRF54L15? Or does the nRF54L15 support this feature, but it hasn't been thoroughly validated and may lead to unpredictable effects? I noticed that the NRF54L15 chip manual includes this register, which is a very important detail. Thank you!

RE: about CONFIG_ESB_FAST_SWITCHING

Liny — Fri, 10 Oct 2025 12:17:17 GMT

ok, Sorry, I forgot to switch to English.

2.By the way, why can't CONFIG_ESB_FAST_SWITCHINGand ESB_SHORT_DISABLE_MASKcoexist? Is there any conflict between them? In the code snippet, if CONFIG_ESB_FAST_SWITCHINGis defined, then ESB_SHORT_DISABLE_MASKwill not be enabled.

3.If I configure CONFIG_ESB_FAST_SWITCHING, will the radio not automatically disable after generating the END signal, leading to increased power consumption? How can I reduce power consumption?

4.What is the difference between the radio's events_phyendand events_endsignals? Why is events_phyendcommonly used instead of events_endon the NRF54L15?

RE: about CONFIG_ESB_FAST_SWITCHING

Hieu — Fri, 10 Oct 2025 11:44:56 GMT

Hi Liny,

Could you please rewrite your post in English? I tried using a machine translator, but the result seems wrong, and I can't understand the questions, aside from #1.

Regarding #1, it's indeed true that ESB Fast Switching is only supported experimentally on the nRF54H20. It is simply not supported on the nRF54L15 at the moment.

Hieu