riot-ci/RIOT
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

sys: xtimer: make xtimer use div.h

Browse Source
This commit is contained in:
Kaspar Schleiser 2015-10-08 13:45:42 +02:00
parent f1e742dcf4
commit 725473d9a6
1 changed files with 2 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
sys/xtimer/xtimer.c
View File

@ -21,6 +21,7 @@
#include "mutex.h" #include "mutex.h"
#include "thread.h" #include "thread.h"
#include "irq.h" #include "irq.h"
#include "div.h"
#include "timex.h" #include "timex.h"
@ -150,21 +151,11 @@ void xtimer_set_wakeup64(xtimer_t *timer, uint64_t offset, kernel_pid_t pid)
_xtimer_set64(timer, offset, offset >> 32); _xtimer_set64(timer, offset, offset >> 32);
} }
/**
* see http://www.hackersdelight.org/magic.htm.
* This is to avoid using long integer division functions
* the compiler otherwise links in.
*/
static inline uint64_t _us_to_sec(uint64_t us)
{
return (unsigned long long)(us * 0x431bde83) >> (0x12 + 32);
}
void xtimer_now_timex(timex_t *out) void xtimer_now_timex(timex_t *out)
{ {
uint64_t now = xtimer_now64(); uint64_t now = xtimer_now64();
out->seconds = _us_to_sec(now); out->seconds = div_u64_by_1000000(now);
out->microseconds = now - (out->seconds * SEC_IN_USEC); out->microseconds = now - (out->seconds * SEC_IN_USEC);
} }