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* Deal with numerical overflows.

This commit is contained in:
bg- 2006-08-17 15:25:46 +00:00
parent f0a14fbeae
commit b065b27759
1 changed files with 5 additions and 3 deletions
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8
cpu/msp430/clock.c
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@ -28,7 +28,7 @@
* *
* This file is part of the Contiki operating system. * This file is part of the Contiki operating system.
* *
* @(#)$Id: clock.c,v 1.1 2006/06/17 22:41:21 adamdunkels Exp $ * @(#)$Id: clock.c,v 1.2 2006/08/17 15:25:46 bg- Exp $
*/ */
@ -46,6 +46,8 @@
/* #define INTERVAL (307200ULL / CLOCK_SECOND) */ /* #define INTERVAL (307200ULL / CLOCK_SECOND) */
#define INTERVAL (4096ULL / CLOCK_SECOND) #define INTERVAL (4096ULL / CLOCK_SECOND)
#define MAX_TICKS (~((clock_time_t)0) / 2)
static volatile clock_time_t count = 0; static volatile clock_time_t count = 0;
/*---------------------------------------------------------------------------*/ /*---------------------------------------------------------------------------*/
interrupt(TIMERA1_VECTOR) timera1 (void) { interrupt(TIMERA1_VECTOR) timera1 (void) {
@ -53,8 +55,8 @@ interrupt(TIMERA1_VECTOR) timera1 (void) {
TACCR1 += INTERVAL; TACCR1 += INTERVAL;
++count; ++count;
if(etimer_pending() && count >= etimer_next_expiration_time()) { if(etimer_pending()
/* if(etimer_pending()) { */ && (etimer_next_expiration_time() - count) >= MAX_TICKS) {
etimer_request_poll(); etimer_request_poll();
LPM_AWAKE(); LPM_AWAKE();
} }