275 lines
8.0 KiB
C
275 lines
8.0 KiB
C
/****************************************************************************
|
|
* examples/timer/timer_main.c
|
|
*
|
|
* Copyright (C) 2015 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* 3. Neither the name NuttX nor the names of its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <sys/ioctl.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <fcntl.h>
|
|
#include <signal.h>
|
|
#include <errno.h>
|
|
|
|
#include <nuttx/timers/timer.h>
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
#ifndef CONFIG_EXAMPLE_TIMER_DEVNAME
|
|
# define CONFIG_EXAMPLE_TIMER_DEVNAME "/dev/timer0"
|
|
#endif
|
|
|
|
#ifndef CONFIG_EXAMPLE_TIMER_INTERVAL
|
|
# define CONFIG_EXAMPLE_TIMER_INTERVAL 1000000
|
|
#endif
|
|
|
|
#ifndef CONFIG_EXAMPLE_TIMER_DELAY
|
|
# define CONFIG_EXAMPLE_TIMER_DELAY 100000
|
|
#endif
|
|
|
|
#ifndef CONFIG_EXAMPLE_TIMER_NSAMPLES
|
|
# define CONFIG_EXAMPLE_TIMER_NSAMPLES 20
|
|
#endif
|
|
|
|
#ifndef CONFIG_EXAMPLE_TIMER_SIGNO
|
|
# define CONFIG_EXAMPLE_TIMER_SIGNO 17
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Data
|
|
****************************************************************************/
|
|
|
|
static volatile unsigned long g_nsignals;
|
|
|
|
/****************************************************************************
|
|
* timer_sighandler
|
|
****************************************************************************/
|
|
|
|
static void timer_sighandler(int signo, FAR siginfo_t *siginfo,
|
|
FAR void *context)
|
|
{
|
|
/* Does nothing in this example except for increment a count of signals
|
|
* received.
|
|
*
|
|
* NOTE: The use of signal handler is not recommended if you are concerned
|
|
* about the signal latency. Instead, a dedicated, high-priority thread
|
|
* that waits on sigwaitinfo() is recommended. High priority is required
|
|
* if you want a deterministic wake-up time when the signal occurs.
|
|
*/
|
|
|
|
g_nsignals++;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* timer_status
|
|
****************************************************************************/
|
|
|
|
static void timer_status(int fd)
|
|
{
|
|
struct timer_status_s status;
|
|
int ret;
|
|
|
|
/* Get timer status */
|
|
|
|
ret = ioctl(fd, TCIOC_GETSTATUS, (unsigned long)((uintptr_t)&status));
|
|
if (ret < 0)
|
|
{
|
|
fprintf(stderr, "ERROR: Failed to get timer status: %d\n", errno);
|
|
close(fd);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
/* Print the timer status */
|
|
|
|
printf(" flags: %08lx timeout: %lu timeleft: %lu nsignals: %lu\n",
|
|
(unsigned long)status.flags, (unsigned long)status.timeout,
|
|
(unsigned long)status.timeleft, g_nsignals);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* timer_main
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_BUILD_KERNEL
|
|
int main(int argc, FAR char *argv[])
|
|
#else
|
|
int timer_main(int argc, char *argv[])
|
|
#endif
|
|
{
|
|
struct timer_notify_s notify;
|
|
struct sigaction act;
|
|
int ret;
|
|
int fd;
|
|
int i;
|
|
|
|
/* Open the timer device */
|
|
|
|
printf("Open %s\n", CONFIG_EXAMPLE_TIMER_DEVNAME);
|
|
|
|
fd = open(CONFIG_EXAMPLE_TIMER_DEVNAME, O_RDONLY);
|
|
if (fd < 0)
|
|
{
|
|
fprintf(stderr, "ERROR: Failed to open %s: %d\n",
|
|
CONFIG_EXAMPLE_TIMER_DEVNAME, errno);
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
/* Show the timer status before setting the timer interval */
|
|
|
|
timer_status(fd);
|
|
|
|
/* Set the timer interval */
|
|
|
|
printf("Set timer interval to %lu\n",
|
|
(unsigned long)CONFIG_EXAMPLE_TIMER_INTERVAL);
|
|
|
|
ret = ioctl(fd, TCIOC_SETTIMEOUT, CONFIG_EXAMPLE_TIMER_INTERVAL);
|
|
if (ret < 0)
|
|
{
|
|
fprintf(stderr, "ERROR: Failed to set the timer interval: %d\n", errno);
|
|
close(fd);
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
/* Show the timer status before attaching the timer handler */
|
|
|
|
timer_status(fd);
|
|
|
|
/* Attach a signal handler to catch the notifications. NOTE that using
|
|
* signal handler is very slow. A much more efficient thing to do is to
|
|
* create a separate pthread that waits on sigwaitinfo() for timer events.
|
|
* Much less overhead in that case.
|
|
*/
|
|
|
|
g_nsignals = 0;
|
|
|
|
act.sa_sigaction = timer_sighandler;
|
|
act.sa_flags = SA_SIGINFO;
|
|
|
|
(void)sigfillset(&act.sa_mask);
|
|
(void)sigdelset(&act.sa_mask, CONFIG_EXAMPLE_TIMER_SIGNO);
|
|
|
|
ret = sigaction(CONFIG_EXAMPLE_TIMER_SIGNO, &act, NULL);
|
|
if (ret != OK)
|
|
{
|
|
fprintf(stderr, "ERROR: Fsigaction failed: %d\n", errno);
|
|
close(fd);
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
/* Register a callback for notifications using the configured signal.
|
|
*
|
|
* NOTE: If no callback is attached, the timer stop at the first interrupt.
|
|
*/
|
|
|
|
printf("Attach timer handler\n");
|
|
|
|
notify.arg = NULL;
|
|
notify.pid = getpid();
|
|
notify.signo = CONFIG_EXAMPLE_TIMER_SIGNO;
|
|
|
|
ret = ioctl(fd, TCIOC_NOTIFICATION, (unsigned long)((uintptr_t)¬ify));
|
|
if (ret < 0)
|
|
{
|
|
fprintf(stderr, "ERROR: Failed to set the timer handler: %d\n", errno);
|
|
close(fd);
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
/* Show the timer status before starting */
|
|
|
|
timer_status(fd);
|
|
|
|
/* Start the timer */
|
|
|
|
printf("Start the timer\n");
|
|
|
|
ret = ioctl(fd, TCIOC_START, 0);
|
|
if (ret < 0)
|
|
{
|
|
fprintf(stderr, "ERROR: Failed to start the timer: %d\n", errno);
|
|
close(fd);
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
/* Wait a bit showing timer status */
|
|
|
|
for (i = 0; i < CONFIG_EXAMPLE_TIMER_NSAMPLES; i++)
|
|
{
|
|
usleep(CONFIG_EXAMPLE_TIMER_DELAY);
|
|
timer_status(fd);
|
|
}
|
|
|
|
/* Stop the timer */
|
|
|
|
printf("Stop the timer\n");
|
|
|
|
ret = ioctl(fd, TCIOC_STOP, 0);
|
|
if (ret < 0)
|
|
{
|
|
fprintf(stderr, "ERROR: Failed to stop the timer: %d\n", errno);
|
|
close(fd);
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
/* Detach the signal handler */
|
|
|
|
act.sa_handler = SIG_DFL;
|
|
(void)sigaction(CONFIG_EXAMPLE_TIMER_SIGNO, &act, NULL);
|
|
|
|
/* Show the timer status before starting */
|
|
|
|
timer_status(fd);
|
|
|
|
/* Close the timer driver */
|
|
|
|
printf("Finished\n");
|
|
close(fd);
|
|
return EXIT_SUCCESS;
|
|
}
|