Softdevice assertion failed after some time of advertisment without event

[Valentin]

Hello,

I've a very strange problem with the nrf52838 chip in the ISP4520 (https://www.insightsip.com/products/combo-smart-modules/isp4520).

The nrf52832 advertise all the time and after some time the softdevice assert an error. I have a watchdog so the device reeboot all the time.

The restart comes after 2h10 with an advertisement interval of 3000 (so 1875ms) and after 10min with advertisement interval of 32 (so 20ms). I don't find any parameter which correct my problem... This is my initialisation :

#define APP_ADV_INTERVAL                32
#define BLE_UUID_DEVICE_SHORT           0X1900
static uint8_t serial_number[8];
static ble_advdata_manuf_data_t m_advdata_manuf_data;
static ble_uuid_t m_adv_uuids[] =                                               /**< Universally unique service identifiers. */
{
    {BLE_UUID_DEVICE_SHORT, BLE_UUID_TYPE_BLE}
};

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      = false;
    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.advdata.p_manuf_specific_data	 = &m_advdata_manuf_data;

    lmh_devEui_get(serial_number);
    m_advdata_manuf_data.company_identifier = 0xFFFE;
    m_advdata_manuf_data.data.size = sizeof(serial_number);
    m_advdata_manuf_data.data.p_data = serial_number;

    init.config.ble_adv_on_disconnect_disabled = true;
    init.config.ble_adv_fast_enabled  = true;
    init.config.ble_adv_fast_interval = APP_ADV_INTERVAL;
    init.config.ble_adv_fast_timeout  = BLE_GAP_ADV_TIMEOUT_GENERAL_UNLIMITED;

    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);
}

While nrf52832 advertise, there is no event exept ble event. 

With the debug mode, the softdevice assert at Pc 0x00014CBC. I use the sdk 16.0.

Can anyone help me with this problem ?

Valentin

[Valentin]

Ok, I don't understand neither... I will do more test to be sure that the bug is gone.
In the code, I see the macro CRITICAL_REGION_ENTER() and CRITICAL_REGION_EXIT() but an enter is folow by an exit  :

void TimerStart (TimerEvent_t *obj)
{
    uint32_t elapsedTime = 0;
	 
    if ((obj == NULL) || (TimerExists(obj) == true))
    {
        return;
    }
	
    CRITICAL_REGION_ENTER();
	
    obj->Timestamp = obj->ReloadValue;
    obj->IsRunning = false;

    // First obj in the list
    if (TimerListHead == NULL)
    {
        // enable RTC2 CC[0] interrupts
        NRF_RTC2->EVTENSET = RTC_EVTEN_COMPARE0_Msk;
        NRF_RTC2->INTENSET = RTC_INTENSET_COMPARE0_Msk;
        // Get reference time
        m_rtc_reference_time = RTC2_GetCounterReg();
		
        // insert a timeout at reference time + obj->Timestamp
        TimerInsertNewHeadTimer(obj); 
    }
	// Add obj to the list
	else 
	{
            elapsedTime = RTC2_GetTimerElapsedTime();
            obj->Timestamp += elapsedTime;
  
            if (obj->Timestamp < TimerListHead->Timestamp)
            {
                TimerInsertNewHeadTimer(obj);
            }
            else
            {
                TimerInsertTimer(obj);
            }
	}
	
    CRITICAL_REGION_EXIT();
}

void TimerStop (TimerEvent_t *obj) 
{
    TimerEvent_t* prev = TimerListHead;
    TimerEvent_t* cur = TimerListHead;

    // List is empty or the Obj to stop does not exist 
    if ((TimerListHead == NULL) || (obj == NULL))
    {
        return;
    }
	
    CRITICAL_REGION_ENTER();

    // Stop the Head  
    if(TimerListHead == obj)                 
    {
        // The head is already running 
        if(TimerListHead->IsRunning == true) 
        {    
            // If another obj is registered we switch to it
            if(TimerListHead->Next != NULL)
            {
                TimerListHead->IsRunning = false;
                TimerListHead = TimerListHead->Next;
                TimerSetTimeout(TimerListHead);
            }
            // No other obj registered: we can disable interrupts
            else
            {
                // Disable RTC2 CC[0] interrupt
                NRF_RTC2->EVTENSET = RTC_EVTEN_COMPARE0_Disabled;
                NRF_RTC2->INTENSET = RTC_INTENSET_COMPARE0_Disabled;
                TimerListHead = NULL;
            }
        }
        // Stop the head before it is started
        else 
        {   
            if(TimerListHead->Next != NULL)   
            {
                TimerListHead = TimerListHead->Next;
            }
            else
            {
                TimerListHead = NULL;
            }
        }
    }
    // Stop an object within the list
    else 
    {      
        while (cur != NULL)
        {
            if(cur == obj)
            {
                if(cur->Next != NULL)
                {
                    cur = cur->Next;
                    prev->Next = cur;
                }
                else
                {
                    cur = NULL;
                    prev->Next = cur;
                }
                break;
            }
            else
            {
		prev = cur;
                cur = cur->Next;
            }
        }   
    }
	
    CRITICAL_REGION_EXIT();
}  

I haven't write this code, this is the sdk by insight for ISP4520.
If I have the bug again, I will post a new message.

Valentin

[Valentin]

Hi Kenneth,

I always have the problem....

I found more clues : when I comment the code NVIC_ClearPendingIRQ(FPU_IRQn) in function pwr_mgmt_fpu_sleep_prepare() use by pwr_management, the nrf52832 don't reset. I try to decrease interrupt priority of FPU_IRQn but no result...

So, the nrf52832 reset after some time related to the Bluetooth advertisement interval, the longer the interval, the longer the time between two resets.
It's possible that advertisment do a division by 0 that catch by FPU ?

I use the flag BLE_GAP_ADV_TIMEOUT_GENERAL_UNLIMITED, can this flag change something ?

Regards,

Valentin

[Kenneth]

I don't have any explanation to this, I cannot find similar reports.

Do you see the same on multiple modules or is it this module in specific?

Best regards,
Kenneth

[Valentin]

Hello,

I tried my code in the board PCA10040 and the reset is still here. I will try different parameter in BLE section.
It's possible to have code review of my Bluetooth initialisation in private ?

Valentin

[Kenneth]

If you have a project I can compile and run on a stand-alone nRF52-DK I can look into it.

Edit: The case is now private.

Best regards,
Kenneth