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Macros for TSCH

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US_TO_RTIMERTICKS(US) and RTIMERTICKS_TO_US(T)
This commit is contained in:
thomas-ha 2016-03-07 17:25:40 +01:00
parent 8b3d220761
commit b4c2cd9619
1 changed files with 14 additions and 0 deletions
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14
cpu/cc2538/rtimer-arch.h
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@ -65,6 +65,20 @@
#define RTIMER_ARCH_SECOND 32768
/* Do the math in 32bits to save precision.
* Round to nearest integer rather than truncate. */
#define US_TO_RTIMERTICKS(US) ((US) >= 0 ? \
(((int32_t)(US) * (RTIMER_ARCH_SECOND) + 500000) / 1000000L) : \
((int32_t)(US) * (RTIMER_ARCH_SECOND) - 500000) / 1000000L)
#define RTIMERTICKS_TO_US(T) ((T) >= 0 ? \
(((int32_t)(T) * 1000000L + ((RTIMER_ARCH_SECOND) / 2)) / (RTIMER_ARCH_SECOND)) : \
((int32_t)(T) * 1000000L - ((RTIMER_ARCH_SECOND) / 2)) / (RTIMER_ARCH_SECOND))
/* A 64-bit version because the 32-bit one cannot handle T >= 4295 ticks.
Intended only for positive values of T. */
#define RTIMERTICKS_TO_US_64(T) ((uint32_t)(((uint64_t)(T) * 1000000 + ((RTIMER_ARCH_SECOND) / 2)) / (RTIMER_ARCH_SECOND)))
/** \sa RTIMER_NOW() */
rtimer_clock_t rtimer_arch_now(void);