nuttx-apps/examples/apds9960/apds9960_main.c

/****************************************************************************
 * examples/apds9960/apds9960_main.c
 *
 *   Copyright (C) 2017 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 <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>

#include <nuttx/sensors/apds9960.h>

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

#ifndef CONFIG_EXAMPLES_APDS9960_DEVNAME
#  define CONFIG_EXAMPLES_APDS9960_DEVNAME "/dev/gest0"
#endif

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * apds9960_main
 ****************************************************************************/

#ifdef BUILD_MODULE
int main(int argc, FAR char *argv[])
#else
int apds9960_main(int argc, char *argv[])
#endif
{
  int fd;
  int nbytes;
  char gest;

  fd = open(CONFIG_EXAMPLES_APDS9960_DEVNAME, O_RDONLY|O_NONBLOCK);
  if (fd < 0)
    {
      int errcode = errno;
      printf("ERROR: Failed to open %s: %d\n",
             CONFIG_EXAMPLES_APDS9960_DEVNAME, errcode);
      goto errout;
    }

  while (1)
    {
      nbytes = read(fd, (void *)&gest, sizeof(gest));
      if (nbytes == 1)
        {
          switch (gest)
            {
              case DIR_LEFT:
                printf("LEFT\n");
                break;

              case DIR_RIGHT:
                printf("RIGHT\n");
                break;

              case DIR_UP:
                printf("UP\n");
                break;

              case DIR_DOWN:
                printf("DOWN\n");
                break;
            }
        }

      fflush(stdout);

      /* Wait 10ms */

      usleep(10000);
    }

  return 0;

errout:
  return EXIT_FAILURE;
}