From 1da31e2b251edb8174ea591b67da33b1ac27b554 Mon Sep 17 00:00:00 2001
From: bernie <bernie@38d2e660-2303-0410-9eaa-f027e97ec537>
Date: Wed, 21 Jul 2004 00:15:13 +0000
Subject: [PATCH 1/1] Put timer driver on diet.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@75 38d2e660-2303-0410-9eaa-f027e97ec537
---
 drv/timer.c | 29 +++++++++++++++++++++++++----
 drv/timer.h | 37 ++++++++++++++++++++++++++++---------
 2 files changed, 53 insertions(+), 13 deletions(-)

diff --git a/drv/timer.c b/drv/timer.c
index 64eaf944..06213368 100755
--- a/drv/timer.c
+++ b/drv/timer.c
@@ -15,6 +15,9 @@
 
 /*
  * $Log$
+ * Revision 1.9  2004/07/21 00:15:13  bernie
+ * Put timer driver on diet.
+ *
  * Revision 1.8  2004/07/18 21:57:07  bernie
  * Fix preprocessor warning with potentially undefined symbol.
  *
@@ -62,7 +65,13 @@
 //! Master system clock (1ms accuracy)
 volatile time_t _clock;
 
-REGISTER static List timers_queue;      /*!< Active timers */
+
+#ifndef CONFIG_TIMER_DISABLE_EVENTS
+
+/*!
+ * List of active asynchronous timers.
+ */
+REGISTER static List timers_queue;
 
 
 /*!
@@ -116,6 +125,8 @@ Timer *timer_abort(Timer *timer)
 	return timer;
 }
 
+#endif /* CONFIG_TIMER_DISABLE_EVENTS */
+
 
 /*!
  * Wait for the specified amount of time (expressed in ms)
@@ -142,6 +153,7 @@ void timer_delay(time_t time)
 }
 
 
+#ifndef CONFIG_TIMER_DISABLE_UDELAY
 /*!
  * Wait for the specified amount of time (expressed in microseconds)
  *
@@ -166,6 +178,7 @@ void timer_udelay(utime_t usec_delay)
 	while (timer_hw_hpread() - start < delay)
 	{}
 }
+#endif /* CONFIG_TIMER_DISABLE_UDELAY */
 
 
 /*!
@@ -174,14 +187,18 @@ void timer_udelay(utime_t usec_delay)
  */
 DEFINE_TIMER_ISR
 {
-	/* With the Metrowerks compiler, the only way to force the compiler generate
-	   an interrupt service routine is to put a pragma directive within the function
-	   body. */
+	/*
+	 * With the Metrowerks compiler, the only way to force the compiler generate
+	 * an interrupt service routine is to put a pragma directive within the function
+	 * body.
+	 */
 	#ifdef __MWERKS__
 	#pragma interrupt saveall
 	#endif
 
+#ifndef CONFIG_TIMER_DISABLE_EVENTS
 	Timer *timer;
+#endif
 
 	TIMER_STROBE_ON;
 
@@ -190,6 +207,7 @@ DEFINE_TIMER_ISR
 	/* Update the master ms counter */
 	++_clock;
 
+#ifndef CONFIG_TIMER_DISABLE_EVENTS
 	/*
 	 * Check the first timer request in the list and process
 	 * it when it has expired. Repeat this check until the
@@ -209,6 +227,7 @@ DEFINE_TIMER_ISR
 		/* Execute the associated event */
 		event_doIntr(&timer->expire);
 	}
+#endif /* CONFIG_TIMER_DISABLE_EVENTS */
 
 	TIMER_STROBE_OFF;
 }
@@ -221,7 +240,9 @@ void timer_init(void)
 {
 	TIMER_STROBE_INIT;
 
+#ifndef CONFIG_TIMER_DISABLE_EVENTS
 	INITLIST(&timers_queue);
+#endif
 
 	_clock = 0;
 
diff --git a/drv/timer.h b/drv/timer.h
index 5a9c93e2..da5a5d1c 100755
--- a/drv/timer.h
+++ b/drv/timer.h
@@ -15,6 +15,9 @@
 
 /*
  * $Log$
+ * 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.
  *
@@ -50,15 +53,33 @@
 #include "compiler.h"
 #include <mware/list.h>
 
+/*! Number of timer ticks per second. */
+#define TICKS_PER_SEC       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
 
-/*! Number of timer ticks per second. */
-#define TICKS_PER_SEC       1000
-
+/*!
+ * The timer driver supports multiple ssynchronous timers
+ * that can trigger an event when they expire.
+ *
+ * \sa timer_add()
+ * \sa timer_abort()
+ */
 typedef struct Timer
 {
 	Node   link;      /*!< Link into timers queue */
@@ -67,12 +88,8 @@ typedef struct Timer
 	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);
 
 #if defined(CONFIG_KERN_SIGNALS) && CONFIG_KERN_SIGNALS
 
@@ -96,6 +113,7 @@ INLINE void timer_set_delay(Timer* timer, time_t delay)
 	timer->delay = delay;
 }
 
+#endif /* CONFIG_TIMER_DISABLE_EVENTS */
 
 extern volatile time_t _clock;
 
@@ -140,8 +158,9 @@ INLINE time_t timer_tick(void)
 
 
 /*!
- * Like \c timer_tick, faster version to be called
- * from interrupt context only.
+ * Faster version of timer_tick(), to be called only when the timer
+ * interrupt is disabled (DISABLE_INTS) or overridden by a
+ * higher-priority or non-nesting interrupt.
  *
  * \sa timer_tick
  */
-- 
2.25.1