[GitHub] [incubator-nuttx] v01d commented on pull request #1726: nRF52: extend systimer support

[GitBox <gi...@apache.org>]

v01d commented on pull request #1726:
URL: https://github.com/apache/incubator-nuttx/pull/1726#issuecomment-687905348


   > It appears that STM32 sets a zero interval timeout. So the interrupt and call to nxsched_alarm_expiration() will occurr immediately.
   
   Ah, that makes sense. Thanks for checking.
   So it is expected that the 200ms timer is always working even with one task? It would be cool if no interrupts fired unless necessary.
   
   > NOTICE that tickless mode does not have the drift that you were concerned about when using the oneshot timer for a periodic event: The tickless mode uses both a free-running and a one-shot timer (which might be one or two times). So it gets the time that the interval timer is processed directly from the free-running timer.
   
   I modeled this implementation for nRF52 following the idea that stm32_tickless.c uses with just one timer. I used TICKLESS_ALARM though, whereas stm32_tickless.c uses non-alarm mode.
   


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