/*!
* \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.
* -->
/*
* $Log$
+ * Revision 1.14 2004/08/03 15:50:03 aleph
+ * Rename timer_tick() to timer_ticks()
+ *
+ * Revision 1.13 2004/08/02 20:20:29 aleph
+ * Merge from project_ks
+ *
+ * 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
*
#include "cpu.h"
#include "compiler.h"
+#include <config.h>
#include <mware/list.h>
-#include <kern/event.h>
/*! Number of timer ticks per second. */
-#define TICKS_PER_SEC 1000
+#define TICKS_PER_SEC ((time_t)1000)
+
+/* Function protos */
+extern void timer_init(void);
+extern void timer_delay(time_t time);
+
+#ifndef CONFIG_TIMER_DISABLE_UDELAY
+extern void timer_udelay(utime_t utime);
+#endif
+
+
+#ifndef CONFIG_TIMER_DISABLE_EVENTS
+
+#ifdef 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 */
Event expire; /*!< Event to execute when the timer expires */
} Timer;
-/* Function protos */
-extern void timer_init(void);
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);
timer->delay = delay;
}
+#endif /* CONFIG_TIMER_DISABLE_EVENTS */
+
+extern volatile time_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
+ * time_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 time_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 time_t timer_ticks(void)
{
- extern volatile time_t _clock;
-
time_t result;
cpuflags_t flags;
return result;
}
+/* OBSOLETE */
+#define timer_gettick timer_ticks
+
/*!
- * 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 time_t timer_ticks_unlocked(void)
{
- extern volatile time_t _clock;
-
return _clock;
}
+/* OBSOLETE */
+#define timer_gettick_irq timer_ticks_unlocked
+
+
+/*!
+ * Return the minutes passed since timer start.
+ *
+ * The minutes uptime is computed directly from system tick counter:
+ * in case of a 4 bytes time_t after 71582 minutes the value will
+ * wrap around.
+ */
+INLINE time_t timer_minutes(void)
+{
+ return timer_ticks() / (TICKS_PER_SEC * 60);
+}
+
#endif /* DRV_TIMER_H */
projects / bertos.git / blobdiff