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ztimer: add ztimer_spin()

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This adds a simple busy waiting function intended for blocking, but very
precise short delays.
This commit is contained in:
Kaspar Schleiser 2020-09-11 00:18:59 +02:00
parent 4db8a1f602
commit fb7e285acd
1 changed files with 13 additions and 0 deletions
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13
sys/include/ztimer.h
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@ -444,6 +444,19 @@ void ztimer_periodic_wakeup(ztimer_clock_t *clock, uint32_t *last_wakeup,
*/
void ztimer_sleep(ztimer_clock_t *clock, uint32_t duration);
/**
* @brief Busy-wait specified duration
*
* @note: This blocks lower priority threads. Use only for *very* short delays.
*
* @param[in] clock ztimer clock to use
* @param[in] duration duration to spin, in @p clock time units
*/
static inline void ztimer_spin(ztimer_clock_t *clock, uint32_t duration) {
uint32_t end = ztimer_now(clock) + duration;
while ((end - ztimer_now(clock)) < duration) {}
}
/**
* @brief Set a timer that wakes up a thread
*