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Merge pull request #15113 from kaspar030/fix_ztimer_spin

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ztimer: fix ztimer_spin() time_left == duration case
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benpicco 2020-09-29 13:00:19 +02:00 committed by GitHub
commit 9970a26277
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1 changed files with 4 additions and 1 deletions
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5
sys/include/ztimer.h
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@ -456,7 +456,10 @@ void ztimer_sleep(ztimer_clock_t *clock, uint32_t duration);
*/ */
static inline void ztimer_spin(ztimer_clock_t *clock, uint32_t duration) { static inline void ztimer_spin(ztimer_clock_t *clock, uint32_t duration) {
uint32_t end = ztimer_now(clock) + duration; uint32_t end = ztimer_now(clock) + duration;
while ((end - ztimer_now(clock)) < duration) {}
/* Rely on integer overflow. `end - now` will be smaller than `duration`,
* counting down, until it underflows to UINT32_MAX. Loop ends then. */
while ((end - ztimer_now(clock)) <= duration) {}
} }
/** /**