mesh sdk2.1.1 TX power of nrf52832

RE: mesh sdk2.1.1 TX power of nrf52832

jowei — Wed, 19 Sep 2018 08:17:41 GMT

Hi Bjorn:

I following this thread:

https://devzone.nordicsemi.com/f/nordic-q-a/38292/mesh-proxy-sdk2-1-1-tx-power-of-nrf52832

And the tx power can be changed, thank you

RE: mesh sdk2.1.1 TX power of nrf52832

Bjørn Kvaale — Wed, 29 Aug 2018 13:05:14 GMT

Hi Joseph,

Very sorry for the delayed response. Just tested this. I replied to a similar devzone case here, where I wrote the following:

The old answer is left below (relevant to the Mesh SDK, not nRF 5 SDK): There have been quite a few questions & answers regarding this on the devzone, but unfortunately it is not possible to use sd_ble_gap_tx_power_set() to change the TX transmit power of the radio (for the Mesh SDK!).

The radio_config_config() function in radio_config.c sets the transmit power of the radio. If you take a look at mesh sdk v2.1.1 with the light switch example (take provisioner for example), you can see that the advertiser_instance_init() function in advertiser.c calls set_default_broadcast_configuration(). This function sets the TX radio output power. Then, back in advertiser_instance_init(), the timeout_event callback is called. This function calls schedule_broadcast() if the broadcast context is inactive. Inside schedule_broadcast(), the broadcast_send() function is called, which starts the broadcast_start() callback function. It is broadcast_start() which then finally calls radio_config_config(), which sets the tx power:

NRF_RADIO->TXPOWER = p_config->tx_power;

To summarize: I believe you will only need to change the radio tx power in set_default_broadcast_configuration().

I tested by setting the radio tx power to -40 dBm & comparing the results by changing it to plus 4 dBm. I noticed a large difference in RSSI between these two tx powers.

Kind Regards,

Bjørn

RE: mesh sdk2.1.1 TX power of nrf52832

jowei — Fri, 24 Aug 2018 14:22:37 GMT

Hi nordic:

Is there any update for this issue?

Today I just modify 3 places:

1. set_default_broadcast_configuration() of advertisr.c

p_broadcast->params.radio_config.tx_power = RADIO_POWER_NRF_POS4DBM

2. radio_config_config

NRF_RADIO->TXPOWER = RADIO_POWER_NRF_POS4DBM;

3. scanner_init() of scanner.c

m_scanner.config.radio_config.tx_power = RADIO_POWER_NRF_POS4DBM

And in segger debugger mode, I can see radio TXPower register is changed to 4dbm value, but my instrument still got same measurement value compared to RADIO_POWER_NRF_NEG16DBM setting, could you please guide us how to set tx_power in mesh-sdk-2.1.1?

Regards,

Joseph