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