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sys_clock: add some more useful time conversion macros

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Change-Id: I0ae05d1b9f871b7b832581552442409233cdec5e
Original-work-by: Benjamin Walsh <benjamin.walsh@windriver.com>
Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
This commit is contained in:
Benjamin Walsh 2015-10-01 17:24:49 -04:00 • committed by Anas Nashif
commit 136c18e683
1 changed files with 7 additions and 0 deletions
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7
include/sys_clock.h
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@ -74,6 +74,13 @@ extern int sys_clock_hw_cycles_per_tick;
/* number of milliseconds per second */
#define MSEC_PER_SEC 1000
/* number of microseconds per second */
#define USEC_PER_SEC ((USEC_PER_MSEC) * (MSEC_PER_SEC))
/* number of nanoseconds per second */
#define NSEC_PER_SEC ((NSEC_PER_USEC) * (USEC_PER_MSEC) * (MSEC_PER_SEC))
/* 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) / \