/*!
* \file
* <!--
- * Copyright 2003,2004 Develer S.r.l. (http://www.develer.com/)
+ * Copyright 2003, 2004 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.
* -->
* \brief Hardware independent timer driver (interface)
*/
-/*
- * $Log$
- * 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.
- *
- */
+/*#*
+ *#* $Log$
+ *#* 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 "cpu.h"
-#include "compiler.h"
#include <mware/list.h>
-#include <kern/event.h>
+#include <cpu.h>
+#include <compiler.h>
+#include <config.h>
/*! Number of timer ticks per second. */
-#define TICKS_PER_SEC 1000
+#define TICKS_PER_SEC ((mtime_t)1000)
+
+/* Function protos */
+extern void timer_init(void);
+extern void timer_delay(mtime_t time);
+
+#ifndef CONFIG_TIMER_DISABLE_UDELAY
+extern void timer_udelay(utime_t utime);
+#endif
+
+#ifndef CONFIG_TIMER_DISABLE_EVENTS
+
+#if CONFIG_KERNEL
+ #include <kern/event.h>
+#else
+ #include <mware/event.h>
+#endif
+
+/*!
+ * The timer driver supports multiple synchronous timers
+ * that can trigger an event when they expire.
+ *
+ * \sa timer_add()
+ * \sa timer_abort()
+ */
typedef struct Timer
{
- 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 */
+ Node link; /*!< Link into timers queue */
+ mtime_t delay; /*!< Timer delay in ms */
+ mtime_t tick; /*!< Timer will expire at this tick */
+ Event expire; /*!< Event to execute when the timer expires */
} Timer;
-/* Function protos */
-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);
-INLINE time_t timer_gettick(void);
-INLINE time_t timer_gettick_irq(void);
-INLINE void timer_set_event_softint(Timer* timer, Hook func, void* user_data);
-INLINE void timer_set_delay(Timer* timer, time_t delay);
#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, sigset_t sigs);
INLINE void timer_set_event_signal(Timer* timer, struct Process* proc, sigset_t sigs)
{
event_initSignal(&timer->expire, proc, sigs);
}
/*! Set the timer delay (the time before the event will be triggered) */
-INLINE void timer_set_delay(Timer* timer, time_t delay)
+INLINE void timer_set_delay(Timer* timer, mtime_t delay)
{
timer->delay = delay;
}
+#endif /* CONFIG_TIMER_DISABLE_EVENTS */
+
+extern volatile mtime_t _clock;
/*!
- * Return the system tick counter (expressed in ms)
- * This function must disable interrupts on 8/16bit CPUs because the
+ * \brief Return the system tick counter (expressed in ms)
+ *
+ * The result is guaranteed to increment monotonically,
+ * but client code must be tolerant with respect to overflows.
+ *
+ * The following code is safe:
+ *
+ * \code
+ * mtime_t tea_start_time = get_tick();
+ *
+ * boil_water();
+ *
+ * if (get_tick() - tea_start_time > TEAPOT_DELAY)
+ * printf("Your tea, Sir.\n");
+ * \endcode
+ *
+ * When the tick counter increments every millisecond and mtime_t
+ * is 32bit wide, the tick count will overflow every 49.7 days.
+ *
+ * \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.
*/
-INLINE time_t timer_gettick(void)
+INLINE mtime_t timer_ticks(void)
{
- extern volatile time_t _clock;
-
- time_t result;
+ mtime_t result;
cpuflags_t flags;
DISABLE_IRQSAVE(flags);
/*!
- * Like \c timer_gettick, faster version to be called
- * from interrupt context only.
+ * Faster version of timer_ticks(), to be called only when the timer
+ * interrupt is disabled (DISABLE_INTS) or overridden by a
+ * higher-priority or non-nesting interrupt.
+ *
+ * \sa timer_ticks
*/
-INLINE time_t timer_gettick_irq(void)
+INLINE mtime_t timer_ticks_unlocked(void)
{
- extern volatile time_t _clock;
-
return _clock;
}
#endif /* DRV_TIMER_H */
-
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