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Added support for 32-bit clock ticks: when reading the 32-bit value, make sure that it does not change between readouts to avoid reading right in the middle of it being updated

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adamdunkels 2010-02-23 18:41:20 +00:00
parent 50e1452564
commit 465125c5e7
1 changed files with 9 additions and 2 deletions
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11
cpu/msp430/clock.c
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@ -28,7 +28,7 @@
*
* This file is part of the Contiki operating system.
*
* @(#)$Id: clock.c,v 1.21 2010/01/30 14:03:35 adamdunkels Exp $
* @(#)$Id: clock.c,v 1.22 2010/02/23 18:41:20 adamdunkels Exp $
*/
@ -63,7 +63,9 @@ interrupt(TIMERA1_VECTOR) timera1 (void) {
/* Make sure interrupt time is future */
do {
/* TACTL &= ~MC1;*/
TACCR1 += INTERVAL;
/* TACTL |= MC1;*/
++count;
/* Make sure the CLOCK_CONF_SECOND is a power of two, to ensure
@ -98,7 +100,12 @@ interrupt(TIMERA1_VECTOR) timera1 (void) {
clock_time_t
clock_time(void)
{
return count;
clock_time_t t1, t2;
do {
t1 = count;
t2 = count;
} while(t1 != t2);
return t1;
}
/*---------------------------------------------------------------------------*/
void