X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=drv%2Ftimer.h;h=5c1d9001402c60353d4a3358972efe0cb2b7a911;hb=46ac2c9347e738ee3c23109b83d522023ac4e7c9;hp=c78bee39eeb2886e32e0efe52e82d18b368b6b90;hpb=0c1c0408909a3d03a32435bdb3662ee1634d251e;p=bertos.git

diff --git a/drv/timer.h b/drv/timer.h
index c78bee39..5c1d9001 100755
--- a/drv/timer.h
+++ b/drv/timer.h
@@ -1,4 +1,4 @@
-/*!
+/**
  * \file
  * <!--
  * Copyright 2003, 2004, 2005 Develer S.r.l. (http://www.develer.com/)
@@ -15,6 +15,18 @@
 
 /*#*
  *#* $Log$
+ *#* Revision 1.32  2007/01/09 08:57:19  bernie
+ *#* Remove excess parentheses.
+ *#*
+ *#* Revision 1.31  2006/07/19 12:56:26  bernie
+ *#* Convert to new Doxygen style.
+ *#*
+ *#* 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.
  *#*
@@ -116,16 +128,10 @@
 #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;
 
-/*!
+/**
  * \brief Return the system tick counter (expressed in ticks)
  *
  * The result is guaranteed to increment monotonically,
@@ -155,7 +161,7 @@ INLINE ticks_t timer_clock(void)
 	return result;
 }
 
-/*!
+/**
  * Faster version of timer_clock(), to be called only when the timer
  * interrupt is disabled (DISABLE_INTS) or overridden by a
  * higher-priority or non-nesting interrupt.
@@ -167,60 +173,72 @@ INLINE ticks_t timer_clock_unlocked(void)
 	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 */
+/** 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 */
+/** 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 */
 }
 
 
@@ -244,7 +262,7 @@ INLINE void timer_udelay(utime_t delay)
 
 #include <mware/event.h>
 
-/*!
+/**
  * The timer driver supports multiple synchronous timers
  * that can trigger an event when they expire.
  *
@@ -253,27 +271,27 @@ INLINE void timer_udelay(utime_t delay)
  */
 typedef struct Timer
 {
-	Node    link;     /*!< Link into timers queue */
-	ticks_t _delay;   /*!< Timer delay in ms */
-	ticks_t tick;     /*!< Timer will expire at this tick */
-	Event   expire;   /*!< Event to execute when the timer expires */
+	Node    link;     /**< Link into timers queue */
+	ticks_t _delay;   /**< Timer delay in ms */
+	ticks_t tick;     /**< Timer will expire at this tick */
+	Event   expire;   /**< Event to execute when the timer expires */
 	DB(uint16_t magic;)
 } Timer;
 
-/*! Timer is active when Timer.magic contains this value (for debugging purposes). */
+/** Timer is active when Timer.magic contains this value (for debugging purposes). */
 #define TIMER_MAGIC_ACTIVE    0xABBA
 #define TIMER_MAGIC_INACTIVE  0xBAAB
 
 extern void timer_add(Timer *timer);
 extern Timer *timer_abort(Timer *timer);
 
-/*! Set the timer so that it calls an user hook when it expires */
+/** Set the timer so that it calls an user hook when it expires */
 INLINE void timer_set_event_softint(Timer *timer, Hook func, iptr_t user_data)
 {
 	event_initSoftInt(&timer->expire, func, user_data);
 }
 
-/*! Set the timer delay (the time before the event will be triggered) */
+/** Set the timer delay (the time before the event will be triggered) */
 INLINE void timer_setDelay(Timer *timer, ticks_t delay)
 {
 	timer->_delay = delay;
@@ -283,7 +301,7 @@ INLINE void timer_setDelay(Timer *timer, ticks_t delay)
 
 #if defined(CONFIG_KERN_SIGNALS) && CONFIG_KERN_SIGNALS
 
-/*! Set the timer so that it sends a signal when it expires */
+/** Set the timer so that it sends a signal when it expires */
 INLINE void timer_set_event_signal(Timer *timer, struct Process *proc, sigmask_t sigs)
 {
 	event_initSignal(&timer->expire, proc, sigs);