149 lines
4.7 KiB
C
149 lines
4.7 KiB
C
/****************************************************************************
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* examplex/zerocross/zerocross_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 <errno.h>
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#include <debug.h>
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#include <nuttx/sensors/zerocross.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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#ifndef CONFIG_SENSORS_ZEROCROSS
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# error "CONFIG_SENSORS_ZEROCROSS is not defined in the configuration"
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#endif
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#ifndef CONFIG_EXAMPLES_ZEROCROSS_DEVNAME
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# define CONFIG_EXAMPLES_ZEROCROSS_DEVNAME "/dev/zc0"
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#endif
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#ifndef CONFIG_EXAMPLES_ZEROCROSS_SIGNO
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# define CONFIG_EXAMPLES_ZEROCROSS_SIGNO 13
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#endif
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/* Helpers ******************************************************************/
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#ifndef MIN
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# define MIN(a,b) (a < b ? a : b)
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#endif
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#ifndef MAX
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# define MAX(a,b) (a > b ? a : b)
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* zerocross_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 zerocross_main(int argc, char *argv[])
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#endif
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{
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struct zc_notify_s notify;
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int fd;
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int tmp;
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int ret;
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int errcode = EXIT_FAILURE;
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/* Open the zerocross device */
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fd = open(CONFIG_EXAMPLES_ZEROCROSS_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_ZEROCROSS_DEVNAME, errno);
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return EXIT_FAILURE;
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}
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/* Register to receive a signal on every zero cross event */
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notify.zc_signo = CONFIG_EXAMPLES_ZEROCROSS_SIGNO;
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ret = ioctl(fd, ZCIOC_REGISTER, (unsigned long)((uintptr_t)¬ify));
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if (ret < 0)
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{
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fprintf(stderr, "ERROR: ioctl(ZCIOC_REGISTER) failed: %d\n", errno);
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goto errout_with_fd;
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}
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/* Then loop, receiving signals indicating zero cross events. */
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for (; ; )
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{
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struct siginfo value;
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sigset_t set;
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ssize_t nread;
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/* Wait for a signal */
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(void)sigemptyset(&set);
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(void)sigaddset(&set, CONFIG_EXAMPLES_ZEROCROSS_SIGNO);
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ret = sigwaitinfo(&set, &value);
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if (ret < 0)
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{
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fprintf(stderr, "ERROR: sigwaitinfo() failed: %d\n", errno);
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goto errout_with_fd;
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}
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/* Show the value accompanying the signal */
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printf("Signal received!\n");
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printf("Sample = %d\n", value.si_value.sival_int);
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}
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errcode = EXIT_SUCCESS;
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errout_with_fd:
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close(fd);
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return errcode;
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}
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