nRF5340 Audio TX power

[GatCode]

Hi,

is there any way adjust the ISO channel transmission power (e.g. -20dBm, +2dBm, ...) in the new nRF5340 Audio application? I saw that one can select between 0dBm and +3dBm but nothing else (https://github.com/nrfconnect/sdk-nrf/blob/main/applications/nrf5340_audio/src/bluetooth/ble_hci_vsc.c#L20).

If not, is there a way to just set the global tx power?

Thank you!

[JONATHAN LL]

Hi,

+3dBm is max on the nRF5340 and if you want to set that as the TX power from the get go that is no issue. 

The different TX power levels can be seen here: https://infocenter.nordicsemi.com/topic/ps_nrf5340/radio.html?cp=3_0_0_6_25_14_86#register.TXPOWER 



Regards,
Jonathan

[GatCode]

Can you please give me a sample on how this is achievable? Thanks!

[JONATHAN LL]

The hci_pwr_ctrl can be used, zephyr/samples/bluetooth/hci_pwr_ctrl

Regards,
Joanthan

[GatCode]

Hi Jonathan,

I've already tried this (ncs v2.0.0, linked (LE Audio sample) controller) but I always get the following output and the BT_HCI_ERR_UNKNOWN_CMD error. My prj.conf file looks as follows:

CONFIG_BT=y
CONFIG_BT_DEBUG_LOG=y
CONFIG_BT_PERIPHERAL=y
CONFIG_BT_HRS=y
CONFIG_BT_DEVICE_APPEARANCE=833
CONFIG_BT_DEVICE_NAME="Dynamic test beacon"

CONFIG_BT_HCI=y
CONFIG_BT_CTLR=n
CONFIG_BT_HCI_VS_EXT=n
CONFIG_BT_ATT_ENFORCE_FLOW=n
CONFIG_NCS_INCLUDE_RPMSG_CHILD_IMAGE=n

 

 

Can you please provide me the correct kconf settings? I copied the ones I'm using mostly from the sdk-nrf nrf5340_audio sample.

Thank you!

[Karl Ylvisaker]

Hello Theo,

Thank you for your extreme patience with this.

You can change the TX power using the following function:

ble_hci_vsc_set_adv_tx_pwr() with a ble_hci_vs_tx_power enumeration as the argument.

You can take a closer look at these functions in the ble_hci_vsc.c/.h file file in nrf5340_audio/src/bluetooth.

Best regards,
Karl