-/*!
+/**
* \file
* <!--
- * Copyright 2003,2004 Develer S.r.l. (http://www.develer.com/)
+ * Copyright 2003, 2004, 2005 Develer S.r.l. (http://www.develer.com/)
* Copyright 2000 Bernardo Innocenti <bernie@develer.com>
- * This file is part of DevLib - See devlib/README for information.
+ * This file is part of DevLib - See README.devlib for information.
* -->
*
* \version $Id$
* \brief Hardware independent timer driver (interface)
*/
+/*#*
+ *#* $Log$
+ *#* Revision 1.33 2007/06/07 14:35:12 batt
+ *#* Merge from project_ks.
+ *#*
+ *#* 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.
+ *#*
+ *#* Revision 1.27 2005/11/27 03:04:19 bernie
+ *#* Move test code to timer_test.c; Add OS_HOSTED support.
+ *#*
+ *#* Revision 1.26 2005/11/04 16:20:02 bernie
+ *#* Fix reference to README.devlib in header.
+ *#*
+ *#* Revision 1.25 2005/07/19 07:26:37 bernie
+ *#* Refactor to decouple timer ticks from milliseconds.
+ *#*
+ *#* Revision 1.24 2005/04/11 19:10:28 bernie
+ *#* Include top-level headers from cfg/ subdir.
+ *#*
+ *#* Revision 1.23 2005/03/01 23:25:46 bernie
+ *#* Move event.h to mware/.
+ *#*
+ *#* Revision 1.22 2004/12/13 12:07:06 bernie
+ *#* DISABLE_IRQSAVE/ENABLE_IRQRESTORE: Convert to IRQ_SAVE_DISABLE/IRQ_RESTORE.
+ *#*
+ *#* Revision 1.21 2004/12/09 08:35:21 bernie
+ *#* Replace IPTR with iptr_t.
+ *#*
+ *#* Revision 1.20 2004/12/08 08:56:41 bernie
+ *#* Rename sigset_t to sigmask_t; Reformat.
+ *#*
+ *#* Revision 1.19 2004/12/08 08:30:37 bernie
+ *#* Convert to mtime_t; timer_minutes(): Remove.
+ *#*
+ *#* Revision 1.18 2004/11/16 23:09:52 bernie
+ *#* Disable timer_minutes() for targets with 16bit time_t.
+ *#*
+ *#* Revision 1.17 2004/11/16 22:37:14 bernie
+ *#* Replace IPTR with iptr_t.
+ *#*
+ *#* Revision 1.16 2004/08/25 14:12:08 rasky
+ *#* Aggiornato il comment block dei log RCS
+ *#*
+ *#* Revision 1.15 2004/08/10 06:59:09 bernie
+ *#* timer_gettick(): Rename to timer_ticks() and add backwards compatibility inline.
+ *#*
+ *#* Revision 1.12 2004/07/30 14:34:10 rasky
+ *#* Vari fix per documentazione e commenti
+ *#* Aggiunte PP_CATn e STATIC_ASSERT
+ *#*
+ *#* Revision 1.11 2004/07/29 22:40:12 bernie
+ *#* Spelling fix.
+ *#*
+ *#* Revision 1.10 2004/07/21 00:13:57 bernie
+ *#* Put timer driver on diet.
+ *#*
+ *#* Revision 1.9 2004/07/20 23:45:01 bernie
+ *#* Finally remove redundant protos.
+ *#*
+ *#* Revision 1.8 2004/07/18 21:57:32 bernie
+ *#* timer_gettick(): Rename to timer_tick() and document better.
+ *#*
+ *#* Revision 1.7 2004/06/27 15:26:17 aleph
+ *#* Declaration fix for build with GCC 3.4
+ *#*
+ *#* Revision 1.6 2004/06/07 18:10:06 aleph
+ *#* Remove free pool of timers; use user-provided Timer structure instead
+ *#*
+ *#* Revision 1.5 2004/06/07 15:57:12 aleph
+ *#* Add function prototypes
+ *#*
+ *#* Revision 1.4 2004/06/06 18:25:44 bernie
+ *#* Rename event macros to look like regular functions.
+ *#*
+ *#* Revision 1.3 2004/06/06 16:57:18 bernie
+ *#* Mark some functions INLINE instead of 'extern inline'.
+ *#*
+ *#* Revision 1.2 2004/06/03 11:27:09 bernie
+ *#* Add dual-license information.
+ *#*
+ *#* Revision 1.1 2004/05/23 18:23:30 bernie
+ *#* Import drv/timer module.
+ *#*
+ *#*/
+#ifndef DRV_TIMER_H
+#define DRV_TIMER_H
+
+#include <cfg/os.h>
+#include <cfg/cpu.h>
+
/*
- * $Log$
- * Revision 1.2 2004/06/03 11:27:09 bernie
- * Add dual-license information.
+ * Include platform-specific binding header if we're hosted.
+ * Try the CPU specific one for bare-metal environments.
+ */
+#if OS_HOSTED
+ #include OS_HEADER(timer)
+#else
+ #include CPU_HEADER(timer)
+#endif
+
+#include <mware/list.h>
+#include <cfg/debug.h>
+#include <cfg/compiler.h>
+#include <appconfig.h>
+
+
+extern volatile ticks_t _clock;
+
+/**
+ * \brief Return the system tick counter (expressed in ticks)
+ *
+ * The result is guaranteed to increment monotonically,
+ * but client code must be tolerant with respect to overflows.
+ *
+ * The following code is safe:
+ *
+ * \code
+ * ticks_t tea_start_time = timer_clock();
*
- * Revision 1.1 2004/05/23 18:23:30 bernie
- * Import drv/timer module.
+ * boil_water();
*
+ * if (timer_clock() - tea_start_time > TEAPOT_DELAY)
+ * printf("Your tea, Sir.\n");
+ * \endcode
+ *
+ * \note This function must disable interrupts on 8/16bit CPUs because the
+ * clock variable is larger than the processor word size and can't
+ * be copied atomically.
*/
-#ifndef DRV_TIMER_H
-#define DRV_TIMER_H
+INLINE ticks_t timer_clock(void)
+{
+ ticks_t result;
-#include "cpu.h"
-#include "compiler.h"
-#include <mware/list.h>
-#include <kern/event.h>
+ ATOMIC(result = _clock);
-/*! Number of timer ticks per second. */
-#define TICKS_PER_SEC 1000
+ return result;
+}
-typedef struct Timer
+/**
+ * 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.
+ *
+ * \sa timer_clock
+ */
+INLINE ticks_t timer_clock_unlocked(void)
{
- Node link; /*!< Link into timers queue */
- time_t delay; /*!< Timer delay in ms */
- time_t tick; /*!< Timer will expire at this tick */
- Event expire; /*!< Event to execute when the timer expires */
-} Timer;
+ return _clock;
+}
-extern void timer_init(void);
-extern Timer *timer_new(void);
-extern void timer_delete(Timer *timer);
-extern void timer_add(Timer *timer);
-extern Timer *timer_abort(Timer *timer);
-extern void timer_delay(time_t time);
-extern void timer_udelay(utime_t utime);
-extern inline time_t timer_gettick(void);
-extern inline time_t timer_gettick_irq(void);
-
-#ifdef CONFIG_KERN_SIGNALS
-/*! Set the timer so that it sends a signal when it expires */
-INLINE void timer_set_event_signal(Timer* timer, struct Process* proc, sigset_t sigs)
+/** Convert \a ms [ms] to ticks. */
+INLINE ticks_t ms_to_ticks(mtime_t ms)
{
- INITEVENT_SIG(&timer->expire, proc, sigs);
+#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. */
+INLINE ticks_t us_to_ticks(utime_t us)
+{
+#if TIMER_TICKS_PER_SEC < 1000
+ /* Slow timer: avoid rounding down too much. */
+ return ((us / 1000) * TIMER_TICKS_PER_SEC) / 1000;
+#else
+ /* Fast timer: don't overflow ticks_t. */
+ return (us * ((TIMER_TICKS_PER_SEC + 500) / 1000)) / 1000;
#endif
+}
-/*! Set the timer so that it calls an user hook when it expires */
-INLINE void timer_set_event_softint(Timer* timer, Hook func, void* user_data)
+/** Convert \a ticks [ticks] to ms. */
+INLINE mtime_t ticks_to_ms(ticks_t ticks)
{
- INITEVENT_INT(&timer->expire, func, user_data);
+#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
}
-/*! Set the timer delay (the time before the event will be triggered) */
-INLINE void timer_set_delay(Timer* timer, time_t delay)
+/** Convert \a ticks [ticks] to us. */
+INLINE utime_t ticks_to_us(ticks_t ticks)
{
- timer->delay = delay;
+#if TIMER_TICKS_PER_SEC < 1000
+ /* Slow timer: avoid rounding down too much. */
+ return ((ticks * 1000) / TIMER_TICKS_PER_SEC) * 1000;
+#else
+ /* 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
+}
-/*!
- * Return the system tick counter (expressed in ms)
- * This function must disable interrupts on 8/16bit CPUs because the
- * clock variable is larger than the processor word size and can't
- * be copied atomically.
- */
-extern inline time_t timer_gettick(void)
+/** Convert \a hpticks [hptime] to usec */
+INLINE utime_t hptime_to_us(hptime_t hpticks)
{
- extern volatile time_t _clock;
+#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 */
+}
- time_t result;
- cpuflags_t flags;
- DISABLE_IRQSAVE(flags);
- result = _clock;
- ENABLE_IRQRESTORE(flags);
+void timer_init(void);
+void timer_delayTicks(ticks_t delay);
+INLINE void timer_delay(mtime_t delay)
+{
+ timer_delayTicks(ms_to_ticks(delay));
+}
- return result;
+#if !defined(CONFIG_TIMER_DISABLE_UDELAY)
+void timer_busyWait(hptime_t delay);
+void timer_delayHp(hptime_t delay);
+INLINE void timer_udelay(utime_t delay)
+{
+ timer_delayHp(us_to_hptime(delay));
}
+#endif
+#ifndef CONFIG_TIMER_DISABLE_EVENTS
-/*!
- * Like \c timer_gettick, faster version to be called
- * from interrupt context only.
+#include <mware/event.h>
+
+/**
+ * The timer driver supports multiple synchronous timers
+ * that can trigger an event when they expire.
+ *
+ * \sa timer_add()
+ * \sa timer_abort()
*/
-extern inline time_t timer_gettick_irq(void)
+typedef struct Timer
{
- extern volatile time_t _clock;
+ 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;
- return _clock;
+/** 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 */
+INLINE void timer_set_event_softint(Timer *timer, Hook func, iptr_t user_data)
+{
+ event_initSoftInt(&timer->expire, func, user_data);
}
-#endif /* DRV_TIMER_H */
+/** Set the timer delay (the time before the event will be triggered) */
+INLINE void timer_setDelay(Timer *timer, ticks_t delay)
+{
+ timer->_delay = delay;
+}
+#endif /* CONFIG_TIMER_DISABLE_EVENTS */
+
+#if defined(CONFIG_KERN_SIGNALS) && CONFIG_KERN_SIGNALS
+
+/** 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);
+}
+
+#endif /* CONFIG_KERN_SIGNALS */
+
+
+#endif /* DRV_TIMER_H */
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