v01d opened a new pull request #1726:
URL: https://github.com/apache/incubator-nuttx/pull/1726


   ## Summary
   
   This PR extends systimer options for nRF52 arch. It is possible to use ARM 
SysTick either for tickless or non-tickless mode. It is also possible to now 
use the RTC peripheral for tickless mode. This also re-enables support for 
WFI/WFE sleep if RTC is used, since this counter continues to run in this mode 
(in contrast to SysTick).
   
   ## Impact
   
   nRF52 architecture timing. The default continues to be SysTick in 
non-tickless mode so it should behave as before.
   
   ## Testing
   
   I tested systick in both modes and tickless with RTC. I tested that time 
moves as expected, sleep returns correctly and also verified it continues to 
work once the RTC clock wraps-around.
   


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