How to set tx_power using sd_ble_gap_tx_power_set() on nrf52832?

RE: How to set tx_power using sd_ble_gap_tx_power_set() on nrf52832?

Vidar Berg — Thu, 25 Mar 2021 11:16:21 GMT

As mentioned earlier, the TX_POWER register will always be read as '0' regardless of the power setting.

RE: How to set tx_power using sd_ble_gap_tx_power_set() on nrf52832?

ande_dewal — Thu, 25 Mar 2021 11:05:37 GMT

thanks for reply,

I did that way also, I tested debugging mode on segger embedded studio . but in Radio TX_power register is is always 0dbm.

RE: How to set tx_power using sd_ble_gap_tx_power_set() on nrf52832?

Vidar Berg — Thu, 25 Mar 2021 10:38:58 GMT

A scanner does not have any way of knowing the exact TX output power used by the broadcaster, unless the broadcaster is including this TX power setting value in its advertising data.

You would need dedicated test equipment such as spectrum analyzer if you were to measure the actual output power.

[quote userid="102319" url="~/f/nordic-q-a/72442/how-to-set-tx_power-using-sd_ble_gap_tx_power_set-on-nrf52832/301836#301836"]please tell me exact way to set that properly.[/quote]

It will be set correctly if you use the code you posted earlier .

advertising_init();
err_code = sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_ADV, m_adv_handle,RADIO_TXPOWER_TXPOWER_Pos4dBm);
APP_ERROR_CHECK(err_code);
advertising_start();

RE: How to set tx_power using sd_ble_gap_tx_power_set() on nrf52832?

ande_dewal — Thu, 25 Mar 2021 09:42:47 GMT

thanks for reply,

I tried to get tx_power at scanner code, it always gives 0dbm.

I thought i am passing wrong parameter to this function. please tell me exact way to set that properly.

RE: How to set tx_power using sd_ble_gap_tx_power_set() on nrf52832?

Vidar Berg — Thu, 25 Mar 2021 07:16:34 GMT

The NRF_RADIO->TX_POWER register is set by the Softdevice at the beginning of the advertising event, and cleared at the end. This is the reason why it always reads as '0'. It does not mean that the setting did not get applied.

You can use the RSSI view in our nRF connect app to see what effect the different output power settings have on the RSSI.

RE: How to set tx_power using sd_ble_gap_tx_power_set() on nrf52832?

ande_dewal — Thu, 25 Mar 2021 05:39:44 GMT

thanks for reply,

advertising_init();
err_code = sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_ADV, m_adv_handle,RADIO_TXPOWER_TXPOWER_Pos4dBm);
APP_ERROR_CHECK(err_code);
advertising_start();

after that i read NRF_RADIO->TX_POWER register , it gives always 0dbm.

please help me for change the tx_power in ibecaon code .

RE: How to set tx_power using sd_ble_gap_tx_power_set() on nrf52832?

Vidar Berg — Wed, 24 Mar 2021 13:35:45 GMT

How do you determine that it's not set? Does sd_ble_gap_tx_power_set() return with an error?

RE: How to set tx_power using sd_ble_gap_tx_power_set() on nrf52832?

ande_dewal — Wed, 24 Mar 2021 13:27:06 GMT

thanks for reply,

I tried as per your response. Tx power is not set it gives always default value.

please help me for solve this problem.

RE: How to set tx_power using sd_ble_gap_tx_power_set() on nrf52832?

Vidar Berg — Mon, 08 Mar 2021 12:30:08 GMT

Hi,

This function must be called after advertising_init() and before advertising start. The reason for this is that the advertisment set is not added prior to that. Also, the handle value will always be '0' as multiple advertisment sets are not supported by the Softdevice.

Best regards,

Vidar