270 lines
8.0 KiB
C
270 lines
8.0 KiB
C
/****************************************************************************
|
|
* examples/oneshot/oneshot_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 <string.h>
|
|
#include <signal.h>
|
|
#include <fcntl.h>
|
|
#include <time.h>
|
|
#include <errno.h>
|
|
|
|
#include <nuttx/timers/oneshot.h>
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
#ifndef CONFIG_EXAMPLE_ONESHOT_DEVNAME
|
|
# define CONFIG_EXAMPLE_ONESHOT_DEVNAME "/dev/oneshot"
|
|
#endif
|
|
|
|
#ifndef CONFIG_EXAMPLE_ONESHOT_DELAY
|
|
# define CONFIG_EXAMPLE_ONESHOT_DELAY 100000
|
|
#endif
|
|
|
|
#ifndef CONFIG_EXAMPLE_ONESHOT_SIGNO
|
|
# define CONFIG_EXAMPLE_ONESHOT_SIGNO 13
|
|
#endif
|
|
|
|
/* For long delays that have to be broken into segments, some loss of
|
|
* precision is expected due to interrupt and context switching overhead.
|
|
* This inaccuracy will cause somewhat longer times than the time requested
|
|
* due to this overhead. It might be possible to reduce this inaccuracy
|
|
* some by (1) making this task very high priority so that it runs in a more
|
|
* deterministic way, and (2) by subtracting a "fudge factor" to account for
|
|
* time lost due to the overhead.
|
|
*/
|
|
|
|
#define FUDGE_FACTOR 10
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: oneshot_main
|
|
****************************************************************************/
|
|
|
|
static void show_usage(FAR const char *progname)
|
|
{
|
|
fprintf(stderr, "USAGE: %s [-d <usecs>] [<devname>]\n", progname);
|
|
fprintf(stderr, "Where:\n");
|
|
fprintf(stderr, "\t-d <usecs>:\n");
|
|
fprintf(stderr, "\tSpecifies the oneshot delay in microseconds. Default %ld\n",
|
|
(unsigned long)CONFIG_EXAMPLE_ONESHOT_DELAY);
|
|
fprintf(stderr, "\t<devname>:\n");
|
|
fprintf(stderr, "\tSpecifies the path to the oneshot driver. Default %s\n",
|
|
CONFIG_EXAMPLE_ONESHOT_DEVNAME);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: oneshot_main
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_BUILD_KERNEL
|
|
int main(int argc, FAR char *argv[])
|
|
#else
|
|
int oneshot_main(int argc, char *argv[])
|
|
#endif
|
|
{
|
|
FAR const char *devname = CONFIG_EXAMPLE_ONESHOT_DEVNAME;
|
|
unsigned long usecs = CONFIG_EXAMPLE_ONESHOT_DELAY;
|
|
unsigned long secs;
|
|
struct oneshot_start_s start;
|
|
struct timespec ts;
|
|
uint64_t maxus;
|
|
sigset_t set;
|
|
int ret;
|
|
int fd;
|
|
|
|
/* USAGE: nsh> oneshot [-d <usecs>] [<devname>] */
|
|
|
|
if (argc > 1)
|
|
{
|
|
if (argc == 2)
|
|
{
|
|
/* FORM: nsh> oneshot [<devname>] */
|
|
|
|
devname = argv[1];
|
|
}
|
|
else if (argc < 5)
|
|
{
|
|
/* FORM: nsh> oneshot [-d <usecs>] */
|
|
|
|
if (strcmp(argv[1], "-d") != 0)
|
|
{
|
|
fprintf(stderr, "ERROR: Unrecognized option: %s\n", argv[1]);
|
|
show_usage(argv[0]);
|
|
}
|
|
|
|
usecs = strtoul(argv[2], NULL, 10);
|
|
|
|
if (argc == 4)
|
|
{
|
|
/* FORM: nsh> oneshot [-d <usecs>] [<devname>] */
|
|
|
|
devname = argv[3];
|
|
}
|
|
}
|
|
else
|
|
{
|
|
fprintf(stderr, "ERROR: Unsupported number of arguments: %d\n", argc);
|
|
show_usage(argv[0]);
|
|
}
|
|
}
|
|
|
|
/* Open the oneshot device */
|
|
|
|
printf("Opening %s\n", devname);
|
|
|
|
fd = open(devname, O_RDONLY);
|
|
if (fd < 0)
|
|
{
|
|
fprintf(stderr, "ERROR: Failed to open %s: %d\n",
|
|
devname, errno);
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
/* Get the maximum delay */
|
|
|
|
ret = ioctl(fd, OSIOC_MAXDELAY, (unsigned long)((uintptr_t)&ts));
|
|
if (ret < 0)
|
|
{
|
|
fprintf(stderr, "ERROR: Failed to get the maximum delayl: %d\n",
|
|
errno);
|
|
close(fd);
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
maxus = (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000;
|
|
|
|
printf("Maximum delay is %llu\n", maxus);
|
|
|
|
/* Loop waiting until the full delay expires */
|
|
|
|
while (usecs > 0)
|
|
{
|
|
/* 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;
|
|
|
|
#if FUDGE_FACTOR > 0
|
|
if (usecs > FUDGE_FACTOR)
|
|
{
|
|
usecs -= FUDGE_FACTOR;
|
|
}
|
|
else
|
|
{
|
|
usecs = 0;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
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, NULL);
|
|
if (ret < 0)
|
|
{
|
|
fprintf(stderr, "ERROR: sigwaitinfo failed: %d\n",
|
|
errno);
|
|
close(fd);
|
|
return EXIT_FAILURE;
|
|
}
|
|
}
|
|
|
|
/* Close the oneshot driver */
|
|
|
|
printf("Finished\n");
|
|
close(fd);
|
|
return EXIT_SUCCESS;
|
|
}
|