Honored Contributor
Honored Contributorhi Scott,
Thank you, I tried your advice and it it pretty nice.. But I need timer with interrupt service, which will work as an interval timer and will call interrupt service routine each 20ms. I followed "KURT-Linux User Manual" especially UTIME library. In fact the programming from the user view is the same as for standard linux timer. UTIME library just increases the timer resolution on reasonable value - under 1ms. I suppose that in uClinux must be something similar implemented. I tried interval timer with this code:#include <signal.h># include <sys/time.h># include <stdio.h>
static int i=0;
void timer_handler(int signal)
{
printf("%d\n",i++);
}
void setitimer_test(int delay, int interval, int tries)
{
struct itimerval timer;
sigset_t mask;
struct sigaction action;
int i;
timer.it_interval.tv_sec = 0;
timer.it_interval.tv_usec = interval;
timer.it_value.tv_sec = 0;
timer.it_value.tv_usec = delay;
sigemptyset(&mask);
action.sa_handler = timer_handler;
action.sa_flags = 0;
sigaction(SIGALRM, &action, 0);
setitimer(ITIMER_REAL, &timer, 0);
for (i = 0; i < tries; i++)
{
sigsuspend(&mask);
}
timer.it_interval.tv_sec = 0;
timer.it_interval.tv_usec = 0;
timer.it_value.tv_sec = 0;
timer.it_value.tv_usec = 0;
setitimer(ITIMER_REAL, &timer, 0);
}
int main()
{
setitimer_test(500000,500000,1000);
}
