LESC and FreeRTOS?

RE: LESC and FreeRTOS?

RTMerkel — Wed, 08 Apr 2020 05:08:08 GMT

256 Stack_Type_t entries... so that 256 * 4 = 1024 bytes. I'll increase it ;)

How about the softdevice_task() stack?

How does one remove the nrf_stack_info checks?

By undefining NRF_STACK_GUARD? It's not enabled in my sdk_config.h. How about NRF_STACK_GUARD_CONFIG_SIZE? I assume it's ignored if NRF_STACK_GRARD_ENABLED == 0
By providing a new implementation of nrf_stack_info.h? Yuck ;)

Thanks

RE: LESC and FreeRTOS?

Anthony Ambuehl — Mon, 06 Apr 2020 21:56:40 GMT

BTW, How much space did you allocate to the lesc_task? According to the stack usage view in SES, it looks like lesc_task needs at least 3680 bytes, but I'm not sure if there are any untraced calls through function pointers that might not be accounted for...

RE: LESC and FreeRTOS?

Anthony Ambuehl — Mon, 06 Apr 2020 20:59:27 GMT

Yes. I am removing the nrf_stack_info checks and relying on the freeRTOS stack checks instead.

RE: LESC and FreeRTOS?

RTMerkel — Mon, 06 Apr 2020 20:55:44 GMT

[quote userid="2831" url="~/f/nordic-q-a/59655/lesc-and-freertos/243762"]I plan to disable the stack checking when running in freeRTOS for now to avoid any confusion.[/quote]

I assume you mean disable the Nordic SDK stack checking and not the FreeRTOS stack checking? I ask because the FreeRTOS checks have been very useful to us.

RE: LESC and FreeRTOS?

Anthony Ambuehl — Mon, 06 Apr 2020 20:36:07 GMT

While following your example, I noticed that the nrf_crypto_rng.c library includes nrf_stack_info. I suspect the MACROs present in this file are incorrect for freertos. The function nrf_stack_info_overflowed most likely does not work as intended.

I plan to disable the stack checking when running in freeRTOS for now to avoid any confusion.

RE: LESC and FreeRTOS?

RTMerkel — Tue, 31 Mar 2020 16:06:17 GMT

I made it just above the timer task priority. I'd like to ask that this functionality be added to the SDK as MMD is really needed for debugging while BLE is active.

RE: LESC and FreeRTOS?

Susheel Nuguru — Tue, 31 Mar 2020 13:18:08 GMT

If LESC task is lower priority than softdevice task, then it looks good in my opinion.

RE: LESC and FreeRTOS?

RTMerkel — Mon, 30 Mar 2020 16:12:05 GMT

"LESC" is not part of FreeRTOS, but part of BLE security in the Nordic SDK. The Nordic app_ble_hrs_freertos example is app_ble_hrs ported to FreeRTOS. My initial attempts to modify app_ble_hrs_freertos to support Just-Works pairing and bounding with LESC failed with a connection timeout. The root cause is that the softdevice_task() never calls nrf_ble_lesc_request_handler(). The above code calls nrf_ble_lesc_request_handler() from a second thread.

RE: LESC and FreeRTOS?

CheMax — Mon, 30 Mar 2020 09:14:32 GMT

I would like to understand why this is necessary. Information on LESK cannot be found in the documentation of a freeRTOS.
The essence of the idea is to dynamically lower the priority of the task of the radio handler?