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sys_clock: make public some timing utilities

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Make these public:

  - SECONDS(x): macro that gives the number of ticks in x seconds
  - MSEC(x): macro that gives the number of ticks in x milliseconds
  - MSEC_PER_SEC: number of milliseconds per second
  - USEC_PER_MSEC: number of microseconds per millisecond

Change-Id: Ic5dbf9349651a477b066edb0c6b6721da2b7e5bb
Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
This commit is contained in:
Benjamin Walsh 2015-08-20 15:59:19 -04:00 • committed by Anas Nashif
commit 2d12752637
5 changed files with 15 additions and 7 deletions
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14
include/sys_clock.h
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@ -68,6 +68,12 @@ extern int sys_clock_hw_cycles_per_tick;
/* number of nsec per usec */
#define NSEC_PER_USEC 1000
/* number of microseconds per millisecond */
#define USEC_PER_MSEC 1000
/* number of milliseconds per second */
#define MSEC_PER_SEC 1000
/* SYS_CLOCK_HW_CYCLES_TO_NS64 converts CPU clock cycles to nanoseconds */
#define SYS_CLOCK_HW_CYCLES_TO_NS64(X) \
(((uint64_t)(X) * sys_clock_us_per_tick * NSEC_PER_USEC) / \
@ -85,6 +91,14 @@ extern int sys_clock_hw_cycles_per_tick;
extern int64_t _nano_ticks;
extern struct nano_timer *_nano_timer_list;
/*
* Number of ticks for x seconds. NOTE: With MSEC(), since it does an integer
* division, x must be greater or equal to 1000/sys_clock_ticks_per_sec to get
* a non-zero value.
*/
#define SECONDS(x) ((x) * sys_clock_ticks_per_sec)
#define MSEC(x) (SECONDS(x) / 1000)
#endif /* !_ASMLANGUAGE */
#endif /* _SYS_CLOCK__H_ */