Multiple FreeRTOS Softdevice Tasks not Working

[VikramB]

Hi,

I want to create 2 softdevice tasks, 1 for advertising and 1 for scanning. I have ported the dependencies and some code from the ble_app_freertos_pca10040_s132 into the ble_app_hrs_rscs_relay_pca10040_s132  example. When I call nrf_sdh_freertos_init(adv_scan_start, &erase_bonds) the board works as intended, and does both advertising and scanning correctly, as far as I can tell. When I have two calls to nrf_sdh_freertos_init, however, I get an ERROR 8 (Invalid State) on the advertising side. Why does this occur when I try to run them as 2 separate threads? 

Advertising and Scanning code:

static void scanning_start(void * p_erase_bonds)
{
   scan_start();
    
}
static void advertising_start(void * p_erase_bonds)
{
    bool erase_bonds = *(bool*)p_erase_bonds;

    if (erase_bonds)
    {
        delete_bonds();
        // Advertising is started by PM_EVT_PEERS_DELETE_SUCCEEDED event.
    }
    else
    {
        //scan_start();
        ret_code_t err_code = ble_advertising_start(&m_advertising, BLE_ADV_MODE_FAST);
        APP_ERROR_CHECK(err_code);
        //adv_scan_start();
        //ret_code_t err_code = ble_advertising_start(&m_advertising, BLE_ADV_MODE_FAST);
        //APP_ERROR_CHECK(err_code);
    }
}

Calls to create threads in Main:

    nrf_sdh_freertos_init(scanning_start, &erase_bonds);

    nrf_sdh_freertos_init(advertising_start, &erase_bonds);
    // Start FreeRTOS scheduler.
    vTaskStartScheduler();

Serial Output: 

app: ERROR 8 [NRF_ERROR_INVALID_STATE] at C:\Users\vikra\Downloads\NRFClean\nRF5_SDK_14.2.0_17b948a\examples\ble_central_and_peripheral\experimental\ble_app_hrs_rscs_relay\main.c:1367

Where the error line is line 19 in the advertising_start function.

[Susheel Nuguru]

Probably because the advertising init runs before the softdevice is initialized. The SD initialization could take many milliseconds depending on the accuracy of the LF clock you are using. If you want to run them in two different threads, you need to make sure that advertising task is blocked until SD is initialized

[danielco68]

How would one block the advertising task until the SD is initialized? Is there an indicator one could use to that tells me that SD is initialized. Is the stack_init function returning NRF_SUCESS not the only available indicator?

Thanks