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support for delayed interrupts

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earlier TACCR1 could be set to already passed time if timer A interrupts was delayed
This commit is contained in:
fros4943 2007-10-04 14:14:58 +00:00
parent 2d0225b0e4
commit 5f63995265
1 changed files with 11 additions and 4 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. * This file is part of the Contiki operating system.
* *
* @(#)$Id: clock.c,v 1.8 2007/09/03 19:22:37 joxe Exp $ * @(#)$Id: clock.c,v 1.9 2007/10/04 14:14:58 fros4943 Exp $
*/ */
@ -47,15 +47,22 @@
#define MAX_TICKS (~((clock_time_t)0) / 2) #define MAX_TICKS (~((clock_time_t)0) / 2)
#define LT(a,b) ((signed short)((a)-(b)) < 0)
static volatile clock_time_t count = 0; static volatile clock_time_t count = 0;
static unsigned short last_tar = 0; static unsigned short last_tar = 0;
/*---------------------------------------------------------------------------*/ /*---------------------------------------------------------------------------*/
interrupt(TIMERA1_VECTOR) timera1 (void) { interrupt(TIMERA1_VECTOR) timera1 (void) {
ENERGEST_ON(ENERGEST_TYPE_IRQ); ENERGEST_ON(ENERGEST_TYPE_IRQ);
if(TAIV == 2) { if(TAIV == 2) {
/* Make sure interrupt time is future */
do
{
TACCR1 += INTERVAL; TACCR1 += INTERVAL;
last_tar = TAR;
++count; ++count;
}
while (LT(TACCR1, TAR+INTERVAL));
last_tar = TAR;
if(etimer_pending() if(etimer_pending()
&& (etimer_next_expiration_time() - count - 1) > MAX_TICKS) { && (etimer_next_expiration_time() - count - 1) > MAX_TICKS) {