Using FreeRTOS, RTC and Softdevice?

[Dave_couling]

Just a general resource question. The Softdevice uses RTC0, FreeRTOS (by coded default) uses RTC1. So in order for the SDK ble_conn_params.c to run properly I have to link app_timer_freertos.c to the Makefile.

This leaves RTC2 available for general nrf_drv_rtc usage. Is this an acceptable setup? I seem to be having issues with the RTC module operating properly. When the Softdevice runs all hell breaks loose when I enable RTC2. Is this a bug in SDK12.3?

[Dave_couling]

Also Eclipse always complains about this setup up with the error:

Symbol 'RTC2_CC_NUM' could not be resolved my_rtc.c

The console shows that it compiles fine, but just can't get Eclipse to drop this error.

[Susheel Nuguru]

I am quite confident that this is also related to the problem mentioned in this thread. The problem is that sdk 13 and sdk12.3 introduced a corner case in the freertos internal timers that could cause problems in features of RTOS dependent on RTOS timing.

We should try to solve the compile errors you are getting when you are trying to patch the file mentioned in this thread.

Ideally, it should not have given any warning, which compiler are you using? Please post your errors when you try to use the patched file?

[Dave_couling]

I tried replacing this file. Everything still works fine but Eclipse is still complaining about RTC2. So far I haven't had any issues today. In regards to the thread you mentioned, the root cause was something change the Thread priority causing Cortex Thread faults. Not sure how it happened but since I've re-installed SDK12.3.0 I have only seen this issue a couple times.

[Susheel Nuguru]

What exactly does Eclipse complain? Can you please post that message. Was it about the priorities you mentioned in other post that went away after installing new sdk?

[Dave_couling]

Symbol 'RTC2_CC_NUM' could not be resolved my_rtc.c

Error shown on code line: const nrf_drv_rtc_t rtc = NRF_DRV_RTC_INSTANCE(2); /**< Declaring an instance of nrf_drv_rtc for RTC2 */