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Merge pull request #1709 from benpicco/hwtimer_fix

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allow HWTIMER_SPEED > 1000000
This commit is contained in:
Oleg Hahm 2014-12-04 19:00:38 +01:00
commit 07fe5bcc9f
1 changed files with 15 additions and 3 deletions
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12
core/include/hwtimer.h
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@ -86,14 +86,22 @@ per second for the current architecture."
* @param[in] us number of microseconds
* @return kernel timer ticks
*/
#if HWTIMER_SPEED > 1000000L
#define HWTIMER_TICKS(us) ((us) * (HWTIMER_SPEED / 1000000L))
#else
#define HWTIMER_TICKS(us) ((us) / (1000000L / HWTIMER_SPEED))
#endif
/**
* @brief Convert ticks to microseconds
* @param[in] ticks number of ticks
* @return microseconds
*/
#if HWTIMER_SPEED > 1000000L
#define HWTIMER_TICKS_TO_US(ticks) ((ticks) / (HWTIMER_SPEED / 1000000L))
#else
#define HWTIMER_TICKS_TO_US(ticks) ((ticks) * (1000000L / HWTIMER_SPEED))
#endif
/**
* @brief Maximum hwtimer tick count (before overflow)
@ -107,7 +115,11 @@ number of ticks countable on the current architecture."
/**
* @brief microseconds before hwtimer overflow
*/
#if HWTIMER_SPEED > 1000000L
#define HWTIMER_OVERFLOW_MICROS() (HWTIMER_MAXTICKS / HWTIMER_SPEED * 1000000L)
#else
#define HWTIMER_OVERFLOW_MICROS() (1000000L / HWTIMER_SPEED * HWTIMER_MAXTICKS)
#endif
typedef uint32_t timer_tick_t; /**< data type for hwtimer ticks */