DFU SVCI initialisation crash when adding DFU buttonless service after disabling and re-enabling softdevice

RE: DFU SVCI initialisation crash when adding DFU buttonless service after disabling and re-enabling softdevice

Aymen Rejeb — Thu, 25 Mar 2021 16:27:53 GMT

Good news, I think that I have found the root cause of this weird behavior!

Actually, I have found a DFU SVCI initialization issue that was raised and reported it the DFU SVCI initialisation, missing critical section discussion in the devzone and I have applied the provided patch, which adds a critical section while temporarily redirecting interrupts to bootloader and the problem was solved ☺

RE: DFU SVCI initialisation crash when adding DFU buttonless service after disabling and re-enabling softdevice

Aymen Rejeb — Thu, 25 Mar 2021 14:54:28 GMT

Hi,

Thank you for your quick reply, I'm using bootloader_secure_ble example in SDK 14.2.0

Now, I was trying to reproduce the same behavior that I mentioned in my question, but what I get is a weird behavior:

The nrf_dfu_set_adv_name_init sometimes returns NRF_SUCCESS:

and then application is hanging at the first instruction in the nrf_dfu_svci_vector_table_unset at NRF_LOG_INFO and does not return! and still blocked at __sd_nvic_irq_enable():

And sometime is still blocked at a different instruction! and sometime is works fine!

I tried to comment out the call the NRF_LOG_INFO in the nrf_dfu_svci_vector_table_unset function (as it is 90% failing at this level), the application still hanging at nrf_dfu_set_adv_name_init and don't return, it still blocked:

So as you can see once the nrf_dfu_set_adv_name_init is getting executed (after disabling and enabling again the softdevice) I start having a weird behavior!

I'm start wondering if it is not an issue related to interrupts enable/disable between the applicaton, bootloader

and softdevice?

RE: DFU SVCI initialisation crash when adding DFU buttonless service after disabling and re-enabling softdevice

Edvin — Thu, 25 Mar 2021 13:44:33 GMT

Hello,

What does nrf_dfu_set_adv_name_init() return when the application crashes?

And what sort of bootloader did you flash? Was it the BLE bootloader?

Best regards,

Edvin