text: /****************************************************************************
   * 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
   ****************************************************************************/
  
  int main(int argc, FAR char *argv[])
  {
    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;
  }
  