Ble template app and UART crash

RE: Ble template app and UART crash

lbe — Fri, 06 Apr 2018 11:21:49 GMT

After some time, I was finally able to find the problem!

In my main.c, I was calling advertising_init() AFTER services_init(); like this the UUID for NUS was not recognized as valid.

It was enough to change the order of the two calls (services_init(), then advertising_init()) to fix the problem.

Thanks everyone for the help!

RE: Ble template app and UART crash

lbe — Thu, 05 Apr 2018 12:52:52 GMT

Hi again,

and thanks for the reply. Normally, I use a forum only once the debug and other techniques did not help me finding the solution to a weird problem, like in this case.

RE: Ble template app and UART crash

Sigurd — Thu, 05 Apr 2018 12:36:52 GMT

You should debug to find the reason why the code is not working. If you are using Keil, see this post.

RE: Ble template app and UART crash

lbe — Thu, 05 Apr 2018 12:16:24 GMT

Hi,

thank you for the hint, put it is already there. Actually my code look exactly as the one you posted :).

The app is not able to start if I change the name of the m_adv_uuids.

I just realized there was an error in my post; the code not working is when I define the m_adv_uuids as follows

static ble_uuid_t m_adv_uuids[] =                                               /**< Universally unique service identifiers. */
{
        {BLE_UUID_NUS_SERVICE, NUS_SERVICE_UUID_TYPE}
};

RE: Ble template app and UART crash

Sigurd — Thu, 05 Apr 2018 12:07:52 GMT

Try to place the m_adv_uuids in the scan response packet, as shown in the NUS example.

static void advertising_init(void)
{
    uint32_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_LIMITED_DISC_MODE;

    init.srdata.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
    init.srdata.uuids_complete.p_uuids  = m_adv_uuids;

    init.config.ble_adv_fast_enabled  = true;
    init.config.ble_adv_fast_interval = APP_ADV_INTERVAL;
    init.config.ble_adv_fast_timeout  = APP_ADV_TIMEOUT_IN_SECONDS;

    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);
}

RE: Ble template app and UART crash

lbe — Tue, 03 Apr 2018 14:16:51 GMT

Hi again,

after some digging in the forum, I partially solved my problem following this discussion and setting NRF_SDH_BLE_SERVICE_CHANGED to 0.

I still have a problem when I try to change the value in the array of advertised services....If I leave everything like it is now, i.e.

static ble_uuid_t m_adv_uuids[] =                                               /**< Universally unique service identifiers. */
{
    {BLE_UUID_DEVICE_INFORMATION_SERVICE, BLE_UUID_TYPE_BLE}
};

the application works, and I can correctly receive data on an ipad using the UART from the NRF Toolbox.

If I try to change the code to

static ble_uuid_t m_adv_uuids[] =                                               /**< Universally unique service identifiers. */
{
    {BLE_UUID_DEVICE_INFORMATION_SERVICE, BLE_UUID_TYPE_BLE}
};

The application crashes immediately, meaning that I am not even able to start the debugger.

I suspect there is something I am still missing in the sdk_config.h file, but I cannot figure out what is wrong....

I already commented out NRF_LOG_BACKEND_UART_ENABLED and NRF_LOG_BACKEND_UART_TX_PIN.

Thank you,

RE: Ble template app and UART crash

lbe — Tue, 03 Apr 2018 07:09:08 GMT

Hello,

thanks for your reply. I tried using pins 3 and 4 for the TWI as you suggested, but I get the same problem when I try to register the UART service instead of the default one.

I don't fully get the problem you mention with the ram size....If I am registering an UUID instead of another this can create RAM problems? I think I am missing something...I am trying to have a look in the forum but I am not able to find anything useful so far....Do you have a more precise hint?

Thanks a lot

RE: Ble template app and UART crash

karthikeyan — Fri, 30 Mar 2018 17:40:23 GMT

Hi, the ram size will be the problem check that. Mean while can you change your sda and scl pin to 3 and 4 and check. You can use any pins for twi. To check whether the problem belongs there.

Cheers