How to set tx_power using sd_ble_gap_tx_power_set() on nrf52832?

[dewal]

Hi everyone,

I want to set TX_POWER using sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_ADV,m_adv_handle,RADIO_TXPOWER_TXPOWER_Pos4dBm);

  m_adv_handle = BLE_GAP_ADV_SET_HANDLE_NOT_SET;

m_adv_handle parameter is wrong passed to the function.

I am refering this link https://devzone.nordicsemi.com/f/nordic-q-a/72412/how-to-set-tx_power-using-sd_ble_gap_tx_power_set-on-nrf52832,

but still problem not solved.

[Vidar Berg]

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

[ande_dewal]

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.

[Vidar Berg]

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

[ande_dewal]

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 .

[Vidar Berg]

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.