[NRF52833] [Bluetooth Mesh mode] set Tx power

RE: [NRF52833] [Bluetooth Mesh mode] set Tx power

Tien_Nguyen — Wed, 04 Jan 2023 01:34:09 GMT

In the future I will be converting to the newer NCS, but for now everything is working.
Thanks for the support.

RE: [NRF52833] [Bluetooth Mesh mode] set Tx power

Hieu — Tue, 03 Jan 2023 17:05:15 GMT

[quote user="Tien_Nguyen"]

In "nrf_radio.h" line 273-275, I remove:

#if defined(RADIO_TXPOWER_TXPOWER_Pos8dBm) || defined(NRFX_DOXYGEN)
NRF_RADIO_TXPOWER_POS8DBM = RADIO_TXPOWER_TXPOWER_Pos8dBm, /**< 8 dBm. */
#endif

And replace by:

NRF_RADIO_TXPOWER_POS8DBM = RADIO_TXPOWER_TXPOWER_Pos8dBm,

[/quote]

Are you sure just this change works? Are there any other changes you made that you perhaps forgot to consider?

Your update simply ensures an enum value is exposed regardless of the build configurations.
As the nRF52833 supports +8 dBm, I think that option would be defined regardless, because the nRF52833 supports +8 dBm.

Our R&D also shares that the TX Power is ultimately controlled by the SoftDevice Controller. Thus, even if you made a change that affect the application, it should not have an actual physical impact on signal strength.

Meanwhile, this hack could be dangerous for your future projects which use a device that does not support +8 dBm.

Finally, just out of curiosity, I tried your solution on a separated copy of NCS v2.0.2, it has no effect. It doesn't seem that nrf_radio.h is even included in my build. My tests are done with the Zephyr beacon sample.

If you wish to stay on NCS 2.0.x, our recommendation is that you set TX Power dynamically as I shared in my previous response.

RE: [NRF52833] [Bluetooth Mesh mode] set Tx power

Tien_Nguyen — Thu, 29 Dec 2022 01:41:03 GMT

[quote userid="9456" url="~/f/nordic-q-a/95026/nrf52833-bluetooth-mesh-mode-set-tx-power/402451"]CS v2.1.0 or newer, the Kconfi[/quote]

Yes, i sucessed config TX power by change source in SDK few days ago.

In "nrf_radio.h" line 273-275, I remove:

#if defined(RADIO_TXPOWER_TXPOWER_Pos8dBm) || defined(NRFX_DOXYGEN)
NRF_RADIO_TXPOWER_POS8DBM = RADIO_TXPOWER_TXPOWER_Pos8dBm, /**< 8 dBm. */
#endif

And replace by:

NRF_RADIO_TXPOWER_POS8DBM = RADIO_TXPOWER_TXPOWER_Pos8dBm,

It work like a charm 🙂

RE: [NRF52833] [Bluetooth Mesh mode] set Tx power

Hieu — Wed, 28 Dec 2022 14:22:04 GMT

Hi TienNguyen,

In NCS v2.0.2 and older, CONFIG_BT_CTLR_TX_PWR_PLUS_8 and similar Kconfig CONFIG_BT_CTLR_TX_PWR_* don't work correctly.

You can refer to Known Issue DRGN-15903 here Known issues — nRF Connect SDK 2.0.2 documentation (nordicsemi.com)

If you have to stay with NCS v2.0, please set TX power dynamically instead. The following sample will show you how to do it: Bluetooth: HCI Power Control — Zephyr Project Documentation (nordicsemi.com)

If you can upgrade to NCS v2.1.0 or newer, the Kconfig should work correctly.

Sorry for the inconvenience.

Hieu

RE: [NRF52833] [Bluetooth Mesh mode] set Tx power

AHaug — Wed, 21 Dec 2022 08:47:55 GMT

Did you also include the dependencies that the config setting requires?

https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/kconfig/index.html#!CONFIG_BT_CTLR_TX_PWR_PLUS_8

Kind regard,
Andreas

RE: [NRF52833] [Bluetooth Mesh mode] set Tx power

Tien_Nguyen — Wed, 21 Dec 2022 07:48:16 GMT

I tried the config but nothing changed, I tried measuring the RSSI between 0dbm and 8dbm also no change at all. 0dbm and 8dbm is a very large range so it can be concluded that this setting does not give me the results I want.

RE: [NRF52833] [Bluetooth Mesh mode] set Tx power

AHaug — Tue, 20 Dec 2022 15:28:29 GMT

Hi,

You could try to use CONFIG_BT_CTLR_TX_PWR_PLUS_8=y to change the it to 8dB. There are also similar configs to change it to other values, such as CONFIG_BT_CTLR_TX_PWR_MINUS_4=y if you want to set it to -4 instead of +8

Kind regards,
Andreas