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fixed some timer interrupt bugs and reimplemented clock_fine to avoid disabling interrupts

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This commit is contained in:
joxe 2007-10-04 20:45:29 +00:00
parent 5f63995265
commit 7fe87db86a
1 changed files with 8 additions and 11 deletions
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19
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 1.9 2007/10/04 14:14:58 fros4943 Exp $
* @(#)$Id: clock.c,v 1.10 2007/10/04 20:45:29 joxe Exp $
*/
@ -47,9 +47,8 @@
#define MAX_TICKS (~((clock_time_t)0) / 2)
#define LT(a,b) ((signed short)((a)-(b)) < 0)
static volatile clock_time_t count = 0;
/* last_tar is used for calculating clock_fine, last_ccr might be better? */
static unsigned short last_tar = 0;
/*---------------------------------------------------------------------------*/
interrupt(TIMERA1_VECTOR) timera1 (void) {
@ -61,9 +60,9 @@ interrupt(TIMERA1_VECTOR) timera1 (void) {
TACCR1 += INTERVAL;
++count;
}
while (LT(TACCR1, TAR+INTERVAL));
while ((TACCR1 - TAR) > INTERVAL);
last_tar = TAR;
if(etimer_pending()
&& (etimer_next_expiration_time() - count - 1) > MAX_TICKS) {
etimer_request_poll();
@ -97,12 +96,10 @@ unsigned short
clock_fine(void)
{
unsigned short t;
dint();
t = TAR;
eint();
return (unsigned short)((unsigned long)t - (unsigned long)last_tar);
/* Assign last_tar to local varible that can not be changed by interrupt */
t = last_tar;
/* perform calc based on t, TAR will not be changed during interrupt */
return (unsigned short) (TAR - t);
}
/*---------------------------------------------------------------------------*/
void