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Fix inaccurate time conversion. Remove MSEC_PER_TICK and convert uint32_t to uin64_t.

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This commit is contained in:
Gregory Nutt 2014-08-11 11:14:40 -06:00
parent 51da249d0e
commit b4bbe354fd
1 changed files with 17 additions and 5 deletions
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22
sched/sched/sched_timerexpiration.c
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@ -290,8 +290,13 @@ static unsigned int sched_timer_process(unsigned int ticks, bool noswitches)
static void sched_timer_start(unsigned int ticks)
{
uint32_t msecs;
uint32_t secs;
#ifdef CONFIG_HAVE_LONG_LONG
uint64_t usecs;
uint64_t secs;
#else
uint64_t usecs;
uint64_t secs;
#endif
uint32_t nsecs;
int ret;
@ -308,11 +313,18 @@ static void sched_timer_start(unsigned int ticks)
/* Convert ticks to a struct timespec that up_timer_start() can
* understand.
*
* REVISIT: Calculations may not have acceptable ragne if uint64_t
* is not supported(?)
*/
msecs = TICK2MSEC(ticks);
secs = msecs / MSEC_PER_SEC;
nsecs = (msecs - (secs * MSEC_PER_SEC)) * NSEC_PER_MSEC;
#ifdef CONFIG_HAVE_LONG_LONG
usecs = TICK2USEC((uint64_t)ticks);
#else
usecs = TICK2USEC((uint64_t)ticks);
#endif
secs = usecs / USEC_PER_SEC;
nsecs = (usecs - (secs * USEC_PER_SEC)) * NSEC_PER_MSEC;
ts.tv_sec = (time_t)secs;
ts.tv_nsec = (long)nsecs;