nrf52 reboots after BLE advertising completes

[chancanasta]

Hi, I'm developing something with NFC / BLE handover - it is currently working fine, NFC tag is read by a phone, nrf52 starts advertising and phone then connects to it over BLE.

I just noticed though that if the advertising times out normally with no connection, the board reboots and the board also reboots on disconnect.

The code is based on the experimental nfc/ble example and also the UART example.

static void xxadvertising_init(void)
{
    uint32_t      err_code;
    ble_advdata_t advdata;
    ble_advdata_t scanrsp;

    // Build advertising data struct to pass into @ref ble_advertising_init.
    memset(&advdata, 0, sizeof(advdata));
    advdata.name_type          = BLE_ADVDATA_FULL_NAME;
    advdata.include_appearance = false;
    advdata.flags              = BLE_GAP_ADV_FLAGS_LE_ONLY_LIMITED_DISC_MODE;

    memset(&scanrsp, 0, sizeof(scanrsp));
    scanrsp.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
    scanrsp.uuids_complete.p_uuids  = m_adv_uuids;

    ble_adv_modes_config_t options = {0};
    options.ble_adv_fast_enabled  = BLE_ADV_FAST_ENABLED;
    options.ble_adv_fast_interval = APP_ADV_INTERVAL;
    options.ble_adv_fast_timeout  = APP_ADV_TIMEOUT_IN_SECONDS;

    err_code = ble_advertising_init(&advdata, &scanrsp, &options, on_adv_evt, NULL);
    APP_ERROR_CHECK(err_code);
}

I've reduced main to basically just advertise for 10 seconds and the board will consistently reboot after the 10 seconds.

Any ideas as to what could be the cause ?

Thanks

[Locky]

Look at the BLE event handler function. Here there should be a handler for Advertising Timeout events. I suspect that you should either see a call to reset or system_off.

[chancanasta]

Ok - after tracing it through a bit more, slow advertising mode wasn't enabled, the handler set the current advertising mode to IDLE - then called the custom handler which put the board into sleep mode which called sleep_mode_enter which had sd_power_system_off(); in it Thanks for the responses - much apprecited