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Cosmetic changed, updated README files, improved comments

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Gregory Nutt 2014-08-10 13:11:31 -06:00
parent 77d49f50e0
commit a2ee73235d
1 changed files with 21 additions and 0 deletions
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arch/arm/src/sama5/sam_tickless.c
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@ -54,6 +54,27 @@
* logic when the interval timer expires.
*
****************************************************************************/
/****************************************************************************
* SAMA5 Timer Usage
*
* This current implementation uses two timers: A one-shot timer to provide
* the timed events and a free running timer to provide the current time.
* Since timers are a limited resource, that could be an issue on some
* systems.
*
* We could do the job with a single timer if we were to keep the single
* timer in a free-running at all times. The SAMA5 timer/counters have
* 32-bit counters with the capability to generate a compare interrupt when
* the timer matches a compare value but also to continue counting without
* stopping (giving another, different interrupt when the timer rolls over
* from 0xffffffff to zero). So we could potentially just set the compare
* at the number of ticks you want PLUS the current value of timer. Then
* you could have both with a single timer: An interval timer and a free-
* running counter with the same timer!
*
* Patches are welcome!
*
****************************************************************************/
/****************************************************************************
* Included Files