Reset watchdog for long operations.

[bertos.git] / drv / timer.c

diff --git a/drv/timer.c b/drv/timer.c
index c9c66832fda448b48e8f694db2ab8a624aa3b01d..5a62332f1816656f8f09a41bc35a8038aebd0e64 100755 (executable)
--- a/drv/timer.c
+++ b/drv/timer.c
@@ -6,15 +6,26 @@
  * 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.
+ *#*
  *#* Revision 1.15  2004/09/14 21:07:18  bernie
  *#* Use debug.h instead of kdebug.h.
  *#*
@@ -61,6 +72,7 @@
 
 #include "timer.h"
 #include <cpu.h>
+#include <hw.h>
 #include CPU_HEADER(timer)
 #include <debug.h>
 
@@ -68,6 +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;
 
@@ -97,14 +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 */
@@ -139,6 +173,11 @@ Timer *timer_abort(Timer *timer)
  */
 void timer_delay(time_t time)
 {
+#if defined(IRQ_GETSTATE)
+       /* We shouldn't sleep with interrupts disabled */
+       ASSERT(IRQ_GETSTATE());
+#endif
+
 #if defined(CONFIG_KERN_SIGNALS) && CONFIG_KERN_SIGNALS
        Timer t;