nRF5340 BLE transmit power

[WilsonChen]

Hi Sirs,

in nRF5340, is it doable for  to adjust the power index of different channels of BLE_1M or 2M, in terms of SW code  (if there is then where? or NVRAM like setting (read-out/modify/fill back, and effective right after re-power on and won't vanish from then on until change setting doing agin?

Also it is not doable to change the power index via HCI command dynamiclly druing the test?

Thanks

WilsonChen

[Øivind]

Hi,

MPSL has an api for setting TX power per PHY:

https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.9.1/nrfxlib/mpsl/doc/tx_power_control.html

https://github.com/nrfconnect/sdk-nrfxlib/blob/v1.9.1/mpsl/include/mpsl_tx_power.h#L62-L76

And Zephyr has a sample for setting TX power using hci commands:

https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.9.1/zephyr/samples/bluetooth/hci_pwr_ctrl/README.html

I am not completely sure if it is possible to change the power index of different PHYs using hci commands, or if there are extra considerations when working with nRF5340 or nRF21540. I will look into this and get back to you over the weekend.

[WilsonChen]

Hi Oivind,

Simple questions:

1. By mpsl_tx_power or TX power envelope, during the FCC certificate testing in between BLE 1M, 2M channels, can we set different power limit and change dynamically or need to flash FW or data in and reboot to tak effective?

2. Even BLE is hopping mode in natural, Nordic should have test command to fix the channel for power meter or spectrum analyzer reading the power (RMS), correct?

Thanks,

Wilson