Question about BLE stack

[Ricky]

Hello,

I get a sample code in the dir flllowed after intsalling nRF51 SDK:

\Keil\ARM\Device\Nordic\nrf51822\Board\pca10001\s110\ble_app_beacon_code\main.c

but I still don't know how the BLE stack work after reading SDK document and the comment with the program. I have 2 Question as fllow comment, in detail, I want to know what these function does.

Regards,

Ricky

/**@brief Function for starting advertising.
 */
static void advertising_start(void)
{
    uint32_t err_code;

    err_code = sd_ble_gap_adv_start(&m_adv_params);//[Q1]How does this function worked?
    APP_ERROR_CHECK(err_code);

    nrf_gpio_pin_set(ADVERTISING_LED_PIN_NO);
}

/**@brief Function for doing power management.
 */
static void power_manage(void)
{
    uint32_t err_code = sd_app_evt_wait();//[Q2]How does this function worked?
    APP_ERROR_CHECK(err_code);
}

[Nikita]

Regarding sd_app_evt_wait() you can read this.

sd_ble_gap_adv_start() is just signal to softdevice to start advertising with the specified by ble_advdata_set() (sd_ble_gap_adv_data_set()) data.

[Ricky]

Thank you so much!

Now I want to only broadcast when I push a button, how should I use the API ?

I am new to the BLE stack, thank you again!

[Nikita]

To start advertising you need to call sd_ble_gap_adv_start() and to stop advetrising you need to call sd_ble_gap_adv_stop(). So when you push the button you need to call sd_ble_gap_adv_start() and when you release the button you need to call sd_ble_gap_adv_stop(). P.S. misclicked and converted your comment to answer by mistake.

[Ricky]

thank you so much! :)