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apps/examples/oneshot: If the requested delay is > max_delay, then break the delay up into several pieces.

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This commit is contained in:
Gregory Nutt 2016-08-15 11:44:52 -06:00
parent 85083236d7
commit 0a6dd4a24e
1 changed files with 70 additions and 26 deletions
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96
examples/oneshot/oneshot_main.c
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@ -106,6 +106,8 @@ int oneshot_main(int argc, char *argv[])
unsigned long secs;
struct oneshot_start_s start;
struct siginfo info;
struct timespec ts;
uint64_t maxus;
sigset_t set;
int ret;
int fd;
@ -158,42 +160,84 @@ int oneshot_main(int argc, char *argv[])
return EXIT_FAILURE;
}
/* Start the oneshot timer */
/* Get the maximum delay */
sigemptyset(&set);
sigaddset(&set, CONFIG_EXAMPLE_ONESHOT_SIGNO);
printf("Starting oneshot timer with delay %lu microseconds\n", usecs);
start.pid = 0;
start.signo = CONFIG_EXAMPLE_ONESHOT_SIGNO;
start.arg = NULL;
secs = usecs / 1000000;
usecs -= 1000000 * secs;
start.ts.tv_sec = secs;
start.ts.tv_nsec = usecs * 1000;
ret = ioctl(fd, OSIOC_START, (unsigned long)((uintptr_t)&start));
ret = ioctl(fd, OSIOC_MAXDELAY, (unsigned long)((uintptr_t)&ts));
if (ret < 0)
{
fprintf(stderr, "ERROR: Failed to start the oneshot interval: %d\n",
fprintf(stderr, "ERROR: Failed to get the maximum delayl: %d\n",
errno);
close(fd);
return EXIT_FAILURE;
}
/* Wait for the oneshot to fire */
maxus = (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000;
printf("Waiting...\n");
ret = sigwaitinfo(&set, &info);
if (ret < 0)
printf("Maximum delay is %llu\n", maxus);
/* Loop waiting until the full delay expires */
while (usecs > 0)
{
fprintf(stderr, "ERROR: sigwaitinfo failed: %d\n",
errno);
close(fd);
return EXIT_FAILURE;
/* Start the oneshot timer */
sigemptyset(&set);
sigaddset(&set, CONFIG_EXAMPLE_ONESHOT_SIGNO);
if (usecs < maxus)
{
/* Wait for the remaining time */
printf("Starting oneshot timer with delay %lu microseconds\n",
usecs);
start.pid = 0;
start.signo = CONFIG_EXAMPLE_ONESHOT_SIGNO;
start.arg = NULL;
secs = usecs / 1000000;
usecs -= 1000000 * secs;
start.ts.tv_sec = secs;
start.ts.tv_nsec = usecs * 1000;
/* Zero usecs to terminate the loop */
usecs = 0;
}
else
{
/* Wait for the maximum */
printf("Starting oneshot timer with delay %llu microseconds\n",
maxus);
start.ts.tv_sec = ts.tv_sec;
start.ts.tv_nsec = ts.tv_nsec;
usecs -= maxus;
}
ret = ioctl(fd, OSIOC_START, (unsigned long)((uintptr_t)&start));
if (ret < 0)
{
fprintf(stderr, "ERROR: Failed to start the oneshot interval: %d\n",
errno);
close(fd);
return EXIT_FAILURE;
}
/* Wait for the oneshot to fire */
printf("Waiting...\n");
ret = sigwaitinfo(&set, &info);
if (ret < 0)
{
fprintf(stderr, "ERROR: sigwaitinfo failed: %d\n",
errno);
close(fd);
return EXIT_FAILURE;
}
}
/* Close the oneshot driver */