RE: nrf52840 rssi measured value

Edvin — Wed, 19 Dec 2018 13:59:25 GMT

Hello,

The TX power is the value in the radio's TXPOWER register. At least on the 51 this is by default 0. I believe it still is, but I haven't checked.

You can test by not using sd_ble_gap_tx_power_set() and check this register after starting the softdevice on your nRF52840.

In the adv_report event you can check the received RSSI strength through:

ble_gap_evt_adv_report_t->rssi (int8_t).

Note that the received RSSI value may change with the orientation of the transmitter and the receiver, the antenna, and the layout. You can check with your DKs or your custom PCB, and see how it behaves. Just know that the received RSSI may be different for a different type of device.

Best regards,

Edvin