From b90075ea0ac2b07d090e0479cadee82b0632944c Mon Sep 17 00:00:00 2001
From: fros4943 <fros4943>
Date: Tue, 16 Sep 2008 12:00:48 +0000
Subject: [PATCH] bug fix, msp430 hw bug (undocumented):

when in continuous/compare mode the interrupt handler may get called before CCR==TR.

behavior observed when the timer is toggled between STOP/CONT in an external interrupt handler (serial input).

possibly this problem may also affect watchdog timer/timer B
---
 cpu/msp430/clock.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/cpu/msp430/clock.c b/cpu/msp430/clock.c
index a8bcee165..ac71caeab 100644
--- a/cpu/msp430/clock.c
+++ b/cpu/msp430/clock.c
@@ -28,7 +28,7 @@
  *
  * This file is part of the Contiki operating system.
  *
- * @(#)$Id: clock.c,v 1.14 2008/07/07 23:38:09 adamdunkels Exp $
+ * @(#)$Id: clock.c,v 1.15 2008/09/16 12:00:48 fros4943 Exp $
  */
 
 
@@ -56,6 +56,11 @@ static unsigned short last_tar = 0;
 interrupt(TIMERA1_VECTOR) timera1 (void) {
   ENERGEST_ON(ENERGEST_TYPE_IRQ);
   if(TAIV == 2) {
+
+    /* HW timer bug fix: Interrupt handler called before TR==CCR.
+     * Occurrs when timer state is toggled between STOP and CONT. */
+    while (TACTL & MC1 && TACCR1 - TAR == 1);
+
     /* Make sure interrupt time is future */
     do {
       TACCR1 += INTERVAL;