How to change tx power in nfr52840 throughput test

[mercimek]

Hello, I'm using SDK 15.3.0 throughput test and I want to change TX power to +8dBm. In documents it says change the power from sd_ble_gap_tx_power_set but I couldn't find where this function is. Can you please help me to find where can I change the tx power in firmware?

[Jimmy Wong]

You can refer to the example.

https://github.com/jimmywong2003/nrf5-packet-error-rate-measurement-on-ble-connection/blob/master/ble_app_image_transfer/main.c

static void ble_evt_handler(ble_evt_t const *p_ble_evt, void *p_context)
{
        ret_code_t err_code;

        switch (p_ble_evt->header.evt_id)
        {
        case BLE_GAP_EVT_CONNECTED:

                NRF_LOG_INFO("Connected");
                bsp_board_led_on(CONNECTED_LED);
                bsp_board_led_off(ADVERTISING_LED);

                m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
                err_code = nrf_ble_qwr_conn_handle_assign(&m_qwr, m_conn_handle);
                APP_ERROR_CHECK(err_code);
                err_code = app_button_enable();
                APP_ERROR_CHECK(err_code);
                NRF_LOG_INFO("Actual connection parameter %d", p_ble_evt->evt.gap_evt.params.connected.conn_params.max_conn_interval);

                tx_power_set();

/**@brief Function for changing the tx power.
 */
static void tx_power_set(void)
{

        // ret_code_t err_code = sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_CONN, m_conn_handle, TX_POWER_LEVEL);
        ret_code_t err_code = sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_CONN, m_conn_handle, m_application_state.tx_power * 4);
        APP_ERROR_CHECK(err_code);
}

[mercimek]

Thank you very much this works very well!

[AP040]

I need to set different power at advertising and after connected. 

So, when I used after connected and read RSSI value from nrf connect mobile app it is showing the different level at different power value set in sd_ble_gap_tx_power_set() API.

But same I did for advertising it is not working. I put err_code = sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_ADV ,m_adv_handle,-40); in advertising_init() function.

Is the proper way to do it?