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sys_clock: Add a helper to compute micro seconds

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As for SECONDS() and MSEC, now sys_clock.h provides a USEC() macro.

Change-Id: I43e8b132d2deeb862d8cfda1f785115f339d6ddb
Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
This commit is contained in:
Tomasz Bursztyka 2016-04-04 12:35:48 +02:00 • committed by Anas Nashif
commit 814f5d0b5e
1 changed files with 8 additions and 5 deletions
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13
include/sys_clock.h
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@ -93,12 +93,15 @@ extern int sys_clock_hw_cycles_per_tick;
extern int64_t _sys_clock_tick_count;
/*
* 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.
* Number of ticks for x seconds. NOTE: With MSEC() or USEC(),
* 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.
* You may want to raise CONFIG_SYS_CLOCK_TICKS_PER_SEC depending on
* your requirements.
*/
#define SECONDS(x) ((x) * sys_clock_ticks_per_sec)
#define MSEC(x) (SECONDS(x) / 1000)
#define SECONDS(x) ((x) * sys_clock_ticks_per_sec)
#define MSEC(x) (SECONDS(x) / MSEC_PER_SEC)
#define USEC(x) (MSEC(x) / USEC_PER_MSEC)
#endif /* !_ASMLANGUAGE */