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timer |
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The timer() starts a timer instance, when the timer elapses the associated interrupt is raised and the interrupt function is called.
The timer function returns 0 if successful, else -1.
There are two types of timer instances:
- SINGLE_SHOT_TIMER just for one shot.
- INTERVAL_TIMER this type will be start automatically after the timer elapse
int timer( int timernumber, int timeout)
Example:
int cnt = 0;
#interrupt IV_TIMER
void foo1(int port, int no, char* data, int datalen)
{
switch(port)
{
case TIMER_1:
printf("timer 1\n");
timer(TIMER_1,200,SINGLE_SHOT_TIMER);
break;
case TIMER_2:
printf("timer 2\n");
break;
case TIMER_3:
printf("timer 3\n");
break;
}
cnt++;
}
void main() {
int *ptr = 0;
int t = *ptr++;
setprio(IV_TIMER, TIMER_1, 1);
setprio(IV_TIMER, TIMER_2, 2);
setprio(IV_TIMER, TIMER_3, 3);
timer(TIMER_2,200,INTERVAL_TIMER);
timer(TIMER_3,200,INTERVAL_TIMER);
timer(TIMER_1,200,SINGLE_SHOT_TIMER);
while( cnt < 10 ){}
printf("finish\n");
}
Output:
timer 1
timer 2
timer 3
timer 1
timer 2
timer 3
timer 1
timer 2
timer 3
timer 1
timer 2
timer 3
finish