FEM nrf21540 input power setting by nrf52

RE: FEM nrf21540 input power setting by nrf52

JONATHAN LL — Tue, 20 Jun 2023 08:12:12 GMT

Hi,

Do you want me to share a build and the hex files that I can run on a 833DK + 21540EK. There does not seem to be anything wrong with your configs.

In the latest version of NCS there is a new way for going about the output power. It will set it globally so that the output power from the antenna should match the max output power.

PS: I am on partial parental leave for the time being so the the response is apologetically very slow.

RE: FEM nrf21540 input power setting by nrf52

Muhammad Usman — Sat, 27 May 2023 17:23:17 GMT

Hi Jonathan LL

I tried

CONFIG_BT_CTLR_TX_PWR_0=y // for 0dbm

CONFIG_BT_CTLR_TX_PWR_PLUS_8=y // for 8 dbm

CONFIG_BT_CTLR_TX_PWR_MINUS_20=y // for -20 dbm

one by one with nrf52833DK to ensure that output power is changing or not. Power remained the same -60dbm. can you please help me in this regard?

Thanks & Regards,

RE: FEM nrf21540 input power setting by nrf52

Muhammad Usman — Fri, 26 May 2023 11:52:47 GMT

Hi Jonathan LL

This line of code has to add to the .config file. Is that ok?

CONFIG_BT_CTLR_TX_PWR_0=y // for 0dbm

Thanks & Regards,

RE: FEM nrf21540 input power setting by nrf52

Muhammad Usman — Thu, 25 May 2023 17:36:19 GMT

Hi Jonathan LL

What is the default nrf52 output power in above case?

RE: FEM nrf21540 input power setting by nrf52

Muhammad Usman — Thu, 25 May 2023 17:28:57 GMT

Hi Jonathan LL

Thanks, now the project requirement changed, radio test was for testing the Nrf21540 working.

Now in our main project which is basically a uart peripheral example. We added FEM support in it via config file and pin configurations . It worked well when we changed the out power of nrf21540 via config file or from confreg0 registers directly right?

Now question is how to set output power of nrf52 soc which feeds to nrf21540. As radio test example have provision of changing this via commands.

Thanks in advance

RE: FEM nrf21540 input power setting by nrf52

JONATHAN LL — Thu, 25 May 2023 15:08:39 GMT

[quote user=""]Now I want to configure that input power(can't exceed 4dbm else it will damage the module) in my project to which I added the FEM support.[/quote]

Are you no longer using the radio test sample?

Or is this a new project?

Regards,
Jonathan