How to set sending power of NRF52810 with SDK15.0

[liu]

Hi,

I want to set sending power(+4dBm) of NRF52810/NRF52832 with SDK 15.0.

Now,i  find i should use  the order of sd_ble_gap_tx_power_set(uint8_t role, uint16_t handle, int8_t tx_power));

But , i donn't the meaning of second parameter.

List as follows by SDK15.0:

* @param[in]     handle                     The handle parameter is interpreted depending on role:
* - If role is @ref BLE_GAP_TX_POWER_ROLE_CONN, this value is the specific connection handle.
* - If role is @ref BLE_GAP_TX_POWER_ROLE_ADV, the advertising set identified with the advertising handle,
* will use the specified transmit power, and include it in the advertising packet headers if
* @ref ble_gap_adv_properties_t::include_tx_power set.
* - For all other roles handle is ignored.

Now,  i will make a beacon and  i set it as sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_ADV,0,4);

It is right?

If the role is BLE_GAP_TX_POWER_ROLE_CONN, how to set the second parameter.

[maxx44]

Edvin,

Thanks.  What you described is not quite what I see in my SDK example.  I'm still not seeing how to set the adv_handle correctly in this context.  I've inserted the advertising_init() below.  This comes from the bluetoothds_template.

Max

 

static void advertising_init(void)
{
    ret_code_t    err_code;
    ble_advertising_init_t init;


    memset(&init, 0, sizeof(init));

    init.advdata.name_type               = BLE_ADVDATA_FULL_NAME;
    init.advdata.include_appearance      = true;
    init.advdata.flags                   = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;
    init.advdata.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
    init.advdata.uuids_complete.p_uuids  = m_adv_uuids;

    init.config.ble_adv_fast_enabled   = true;
    init.config.ble_adv_fast_interval  = APP_ADV_INTERVAL;
    init.config.ble_adv_fast_timeout   = APP_ADV_DURATION;

    init.evt_handler = on_adv_evt;

    err_code = ble_advertising_init(&m_advertising, &init);
    APP_ERROR_CHECK(err_code);

    ble_advertising_conn_cfg_tag_set(&m_advertising, APP_BLE_CONN_CFG_TAG);

		// Set transmit power to 4 dBm
		err_code = sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_ADV,????????,4);
		APP_ERROR_CHECK(err_code);
		
}

[liu]

hello,

I used the example of beacon.

I think it should be like this:

........................................................................................

/** @brief Advertising set handle not set. */
#define BLE_GAP_ADV_SET_HANDLE_NOT_SET (0xFF)

static uint8_t              m_adv_handle = BLE_GAP_ADV_SET_HANDLE_NOT_SET; /**< Advertising handle used to identify an advertising set. */

.......................................................................................

advertising_init();
uint8_t err_adv=sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_ADV,m_adv_handle,+4); //after advertising_init();
advertising_start();

Best  regards,

liu

[Edvin]

It is correct, as @liu says. You need to use the advertising handle.

The advertising_init is set up a little different in the Beacon example, and in the regular ble_peripheral examples.

You can find the advertising example in the m_advertising struct.

 

sd_ble_gap_tx_power_set() must be after ble_advertising_init() I am not 100% sure whether it has to be after ble_advertising_conn_cfg_tag_set(), but you will quickly find out.

 

It should look something like this:

ble_advertising_init(...);

ble_advertising_conn_cfg_tag_set(...);

    err_code = sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_ADV, m_advertising.adv_handle, 4);
    APP_ERROR_CHECK(err_code);

[maxx44]

Edvin (and Liu)

Thanks! The m_advertising.adv_handle worked.  And it does appear to increase the transmit power in my module based on just looking at RSSI from a distance.

Appreciate the help,

Max

[Rafael]

hi, can I use this way to change the power even when it was configured by initialization? I need to change the tx power many times during the operation of the device.