/*#*
*#* $Log$
+ *#* Revision 1.30 2006/02/24 00:26:49 bernie
+ *#* Fixes for CONFIG_KERNEL.
+ *#*
+ *#* Revision 1.29 2006/02/21 21:28:02 bernie
+ *#* New time handling based on TIMER_TICKS_PER_SEC to support slow timers with ticks longer than 1ms.
+ *#*
*#* Revision 1.28 2006/02/17 22:24:21 bernie
*#* Update POSIX timer emulator.
*#*
#include <cfg/compiler.h>
#include <appconfig.h>
-/*! Number of timer ticks per second. */
-#define TIMER_TICKS_PER_SEC (TIMER_TICKS_PER_MSEC * 1000)
-
-/*! Number of ticks per microsecond */
-#define TIMER_TICKS_PER_USEC ((TIMER_TICKS_PER_MSEC + 500) / 1000)
-
extern volatile ticks_t _clock;
return _clock;
}
-
-
-//TODO: take care of slow timers so add convertions for seconds to ticks and viceversa.
-
-/*! Convert \a ms [ms] to ticks */
+/*! Convert \a ms [ms] to ticks. */
INLINE ticks_t ms_to_ticks(mtime_t ms)
{
- return ms * TIMER_TICKS_PER_MSEC;
+#if TIMER_TICKS_PER_SEC < 1000
+ /* Slow timer: avoid rounding down too much. */
+ return (ms * TIMER_TICKS_PER_SEC) / 1000;
+#else
+ /* Fast timer: don't overflow ticks_t. */
+ return ms * ((TIMER_TICKS_PER_SEC + 500) / 1000);
+#endif
}
-/*! Convert \a us [us] to ticks */
+/*! Convert \a us [us] to ticks. */
INLINE ticks_t us_to_ticks(utime_t us)
{
-#if TIMER_TICKS_PER_MSEC < 10000
- return (us * TIMER_TICKS_PER_MSEC + 500) / 1000;
+#if TIMER_TICKS_PER_SEC < 1000
+ /* Slow timer: avoid rounding down too much. */
+ return ((us / 1000) * TIMER_TICKS_PER_SEC) / 1000;
#else
- return (us * TIMER_TICKS_PER_USEC);
+ /* Fast timer: don't overflow ticks_t. */
+ return (us * ((TIMER_TICKS_PER_SEC + 500) / 1000)) / 1000;
#endif
}
-/*! Convert \a ticks [ticks] to ms */
+/*! Convert \a ticks [ticks] to ms. */
INLINE mtime_t ticks_to_ms(ticks_t ticks)
{
- return (ticks + TIMER_TICKS_PER_MSEC / 2) / TIMER_TICKS_PER_MSEC;
+#if TIMER_TICKS_PER_SEC < 1000
+ /* Slow timer: avoid rounding down too much. */
+ return (ticks * 1000) / TIMER_TICKS_PER_SEC;
+#else
+ /* Fast timer: avoid overflowing ticks_t. */
+ return ticks / (TIMER_TICKS_PER_SEC / 1000);
+#endif
}
-/*! Convert \a ticks [ticks] to us */
+/*! Convert \a ticks [ticks] to us. */
INLINE utime_t ticks_to_us(ticks_t ticks)
{
-#if TIMER_TICKS_PER_USEC > 10
- return (ticks / TIMER_TICKS_PER_USEC);
+#if TIMER_TICKS_PER_SEC < 1000
+ /* Slow timer: avoid rounding down too much. */
+ return ((ticks * 1000) / TIMER_TICKS_PER_SEC) * 1000;
#else
- return (ticks * 1000 + TIMER_TICKS_PER_MSEC / 2) / TIMER_TICKS_PER_MSEC;
+ /* Fast timer: avoid overflowing ticks_t. */
+ return (ticks / (TIMER_TICKS_PER_SEC / 1000)) * 1000;
#endif
}
/*! Convert \a us [us] to hpticks */
INLINE hptime_t us_to_hptime(utime_t us)
{
- #if TIMER_HW_HPTICKS_PER_SEC > 10000000UL
- return(us * ((TIMER_HW_HPTICKS_PER_SEC + 500000UL) / 1000000UL));
- #else
- return((us * TIMER_HW_HPTICKS_PER_SEC + 500000UL) / 1000000UL);
- #endif /* TIMER_HW_HPTICKS_PER_SEC > 10000000UL */
+#if TIMER_HW_HPTICKS_PER_SEC > 10000000UL
+ return(us * ((TIMER_HW_HPTICKS_PER_SEC + 500000UL) / 1000000UL));
+#else
+ return((us * TIMER_HW_HPTICKS_PER_SEC + 500000UL) / 1000000UL);
+#endif
}
/*! Convert \a hpticks [hptime] to usec */
INLINE utime_t hptime_to_us(hptime_t hpticks)
{
- #if TIMER_HW_HPTICKS_PER_SEC < 100000UL
- return(hpticks * (1000000UL / TIMER_HW_HPTICKS_PER_SEC));
- #else
- return((hpticks * 1000000UL) / TIMER_HW_HPTICKS_PER_SEC);
- #endif /* TIMER_HW_HPTICKS_PER_SEC < 100000UL */
+#if TIMER_HW_HPTICKS_PER_SEC < 100000UL
+ return(hpticks * (1000000UL / TIMER_HW_HPTICKS_PER_SEC));
+#else
+ return((hpticks * 1000000UL) / TIMER_HW_HPTICKS_PER_SEC);
+#endif /* TIMER_HW_HPTICKS_PER_SEC < 100000UL */
}