Is it possible to record HCI logs using nRF52840?

[Michael-1965]

Hi all.

I have written an application using a softdevice and I want to analyse an interesing behavior I don't understand at the moment.
So I want to record a trace/log of the used HCI commands to see what's going on on deeper levels.

Is this possible?

Thanks in advance
Cheers Michael

[Vidar Berg]

Hi,

The Softdevice does not expose a HCI interface to the app. But if you have an extra Nordic DK laying around I would instead recommend you try capturing a sniffer trace with our nRF Sniffer.

Cheers,

Vidar

[Michael-1965]

Hi Vidar.

Thanks for the feedback. I already have a bluetooth sniffer, but this does not help in my case.

My problem is, I wonder if the Nordic chip is able to resolve a received random resolvable address fast enough (pairing has previously done) just after reception of the advertisement to fire the connection-request just after this advertisement.

I have seen some inconsistent results on my system.

Cheers Michael

[Vidar Berg]

Ok, so I assume the symptom is that connect requests are being ignored then. But maybe monitoring of the AAR events could help give a better picture of what's happening. Here's some code I wrote a while back  for this exact purpose:

void SWI0_EGU0_IRQHandler(void)
{
    uint8_t * p_irk = (uint8_t *) NRF_AAR->IRKPTR;
    uint8_t * p_addr = (uint8_t *) (NRF_AAR->ADDRPTR + 3); /* ignore the S0, L, and S1 field */
    
    /* Clear event register */
    NRF_EGU0->EVENTS_TRIGGERED[0] = 0;

    NRF_LOG_INFO("AAR not resolved event triggered"); 

    /* Print the current IRK list used by the AAR */
    for(int i=0; i < NRF_AAR->NIRK; i++)
    {
        NRF_LOG_INFO("IRK # %d", i);
        NRF_LOG_HEXDUMP_INFO(p_irk, BLE_GAP_SEC_KEY_LEN);
        p_irk += BLE_GAP_SEC_KEY_LEN;
       
    }
    NRF_LOG_INFO("Input address:")
    NRF_LOG_HEXDUMP_INFO(p_addr, BLE_GAP_ADDR_LEN);
}

/* Trigger SW interrupt when AAR not resolved event is raised */
void aar_event_init()
{
    NVIC_SetPriority(SWI0_EGU0_IRQn, 6);
    NVIC_EnableIRQ(SWI0_EGU0_IRQn);

    NRF_EGU0->INTENSET = EGU_INTEN_TRIGGERED0_Msk;

    NRF_PPI->CH[0].EEP = (uint32_t) &NRF_AAR->EVENTS_NOTRESOLVED;
    NRF_PPI->CH[0].TEP = (uint32_t) &NRF_EGU0->TASKS_TRIGGER[0];
    
    NRF_PPI->CHENSET = PPI_CHENSET_CH0_Msk;
}