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

[Kenneth]

I need to know which softdevice variant and version, for instance is is S132v6.1.1?

[Valentin]

I use the softdevice s132_nrf52_7.0.1_softdevice.hex.

[Kenneth]

Looking at the code this assert may occur if the softdevice overstayed its planned duration. This typically can occur if application prevent softdevice execution by disable interrupts or having high priority application interrupts. Check out:
https://infocenter.nordicsemi.com/topic/sds_s132/SDS/s1xx/processor_avail_interrupt_latency/exception_mgmt_sd.html

[Valentin]

Hi, I have test to change all priority of my interruption and set the irq priority to 6 but nothing change... The bug is always here...
I look for some informations about interruption with softdevice and after some random change, I haven't the bug anymore but I don't understand why… I change the value NRF_PWR_MGMT_CONFIG_FPU_SUPPORT_ENABLED to 0 and the bug disapear. I use the nrf_pwr_mgmt_run() to got in sleep mode but can you explain me why this resolve my problem ?
Can I delete the preprocessor definition of FLOAT_ABI_HARD or not?

[Kenneth]

I have asked around a bit, this doesn't make any sense no. Maybe the effect here is a slight difference in timing, and this change the behavior.

Are you sure you don't have any critical regions (sd_nvic_critical_region_enter()/_exit()) or disabling interrupts (_disable_irq()/_enable_irq()) anywhere in your project? This may cause the assert.