X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=drv%2Ftimer.c;h=5a62332f1816656f8f09a41bc35a8038aebd0e64;hb=73037040c1e642ddc06f56ea0db6793d67d56023;hp=c347deb56608c669029990f6c20a27f22878fc07;hpb=1f9a4aef45e0bf55a31bf88a828ebd867cf32a34;p=bertos.git

diff --git a/drv/timer.c b/drv/timer.c
index c347deb5..5a62332f 100755
--- a/drv/timer.c
+++ b/drv/timer.c
@@ -6,15 +6,23 @@
  * This file is part of DevLib - See devlib/README for information.
  * -->
  *
- * \version $Id$
+ * \brief Hardware independent timer driver (implementation)
  *
+ * \version $Id$
  * \author Bernardo Innocenti <bernie@develer.com>
- *
- * \brief Hardware independent timer driver (implementation)
  */
 
 /*#*
  *#* $Log$
+ *#* Revision 1.19  2004/10/19 08:56:49  bernie
+ *#* TIMER_STROBE_ON, TIMER_STROBE_OFF, TIMER_STROBE_INIT: Move from timer_avr.h to timer.h, where they really belong.
+ *#*
+ *#* Revision 1.18  2004/10/14 23:14:05  bernie
+ *#* Fix longstanding problem with wrap-arounds.
+ *#*
+ *#* Revision 1.17  2004/10/03 18:52:08  bernie
+ *#* Move \brief on top in header to please Doxygen.
+ *#*
  *#* Revision 1.16  2004/10/03 18:48:01  bernie
  *#* timer_delay(): Add a sanity check to avoid sleeping forever.
  *#*
@@ -64,6 +72,7 @@
 
 #include "timer.h"
 #include <cpu.h>
+#include <hw.h>
 #include CPU_HEADER(timer)
 #include <debug.h>
 
@@ -71,6 +80,24 @@
 	#include <kern/proc.h>
 #endif
 
+
+/*!
+ * \def CONFIG_TIMER_STROBE
+ *
+ * This is a debug facility that can be used to
+ * monitor timer interrupt activity on an external pin.
+ *
+ * To use strobes, redefine the macros TIMER_STROBE_ON,
+ * TIMER_STROBE_OFF and TIMER_STROBE_INIT and set
+ * CONFIG_TIMER_STROBE to 1.
+ */
+#if !defined(CONFIG_TIMER_STROBE) || !CONFIG_TIMER_STROBE
+	#define TIMER_STROBE_ON    do {/*nop*/} while(0)
+	#define TIMER_STROBE_OFF   do {/*nop*/} while(0)
+	#define TIMER_STROBE_INIT  do {/*nop*/} while(0)
+#endif
+
+
 //! Master system clock (1ms accuracy)
 volatile time_t _clock;
 
@@ -100,14 +127,18 @@ void timer_add(Timer *timer)
 	/* Calculate expiration time for this timer */
 	timer->tick = _clock + timer->delay;
 
-	/* Search for the first node whose expiration time is
+	/*
+	 * Search for the first node whose expiration time is
 	 * greater than the timer we want to add.
 	 */
 	node = (Timer *)timers_queue.head;
 	while (node->link.succ)
 	{
-		/* Stop just after the insertion point */
-		if (node->tick > timer->tick)
+		/*
+		 * Stop just after the insertion point.
+		 * (this fancy compare takes care of wrap-arounds).
+		 */
+		if (node->tick - timer->tick > 0)
 			break;
 
 		/* Go to next node */