Switching between BLE advertising and DTM

[TrystanJ]

Hi there,

I'm currently trying to switch from actively advertising to a carrier wave test. This is the code snippet I'm currently debugging on SDK 17.1.0:

if (trigger_test) {
    uint32_t dtm_ret = DTM_SUCCESS;
    uint16_t power_cmd = (LE_TRANSMITTER_TEST << 14) | ((req_power & 0x3F) << 8) | (SET_TX_POWER << 2) | DTM_PKT_VENDORSPECIFIC;
    uint16_t carrier_cmd = (LE_TRANSMITTER_TEST << 14) | (CARRIER_TEST << 2) | DTM_PKT_VENDORSPECIFIC;
    uint16_t frequency = (req_freq - 2402) / 2;
    uint8_t frequency_field = frequency & 0x3F;
    carrier_cmd |= (frequency_field << 8);

    if (ble_advertisement_active) {
        sd_ble_gap_adv_stop(m_advertising.adv_handle);
    }

    if (test_active)
    {
        stop_dtm();
    } else if (ble_active) {
        NRF_LOG_INFO("Disable softdevice");
        uint32_t sd_ret = nrf_sdh_disable_request();
        if (sd_ret != NRF_SUCCESS)
        {
            NRF_LOG_INFO("Softdevice failed to disable %d", sd_ret);
            NRF_LOG_FLUSH();
        }
        while (nrf_sdh_is_enabled()) {} // Wait for SD to finish disabling
        NRF_LOG_INFO("Initialising DTM Driver");
        NRF_LOG_FLUSH();
        dtm_ret = dtm_init();
        if (dtm_ret != DTM_SUCCESS)
        {
            NRF_LOG_INFO("DTM failed to initialise %d", dtm_ret);
        }
    }

    NRF_LOG_INFO("Sending Power DTM CMD");
    NRF_LOG_FLUSH();
    dtm_ret = dtm_cmd(power_cmd);
    
    if (dtm_ret != DTM_SUCCESS)
    {
        NRF_LOG_INFO("DTM power cmd failed %d", dtm_ret);
        return;
    }
    
    NRF_LOG_INFO("Sending Carrier DTM CMD");
    NRF_LOG_FLUSH();
    dtm_ret = dtm_cmd(carrier_cmd);
    
    if (dtm_ret != DTM_SUCCESS)
    {
        NRF_LOG_INFO("DTM carrier cmd failed %d", dtm_ret);
        return;
    }

    test_active = true;
}

The code seems to be freezing when I disable the soft device. Is there anything I'm missing which is needed to switch between BLE and DTM?

Kind Regards,

Trystan

[TrystanJ]

I found my issue. The combination of the BLE NUS example mixed with the DFU service (also from the example code) was the root cause. The last step of disabling the soft device "sdh_state_observer_notify(NRF_SDH_EVT_STATE_DISABLED)" interacted with the buttonless_dfu_sdh_state_observer which powered off the micro. Added in an dfu arming boolean (activated in app_shutdown_handler) to prevent it.

Kind Regards,

Trystan