text: /****************************************************************************
   * examples/touchscreen/tc_main.c
   *
   *   Copyright (C) 2011, 2014-2025 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/types.h>
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <unistd.h>
  #include <fcntl.h>
  #include <errno.h>
  #include <debug.h>
  
  #ifdef CONFIG_EXAMPLES_TOUCHSCREEN_MOUSE
  #  include <nuttx/input/mouse.h>
  #endif
  
  #include <nuttx/input/touchscreen.h>
  
  #include "tc.h"
  
  /****************************************************************************
   * Pre-processor Definitions
   ****************************************************************************/
  
  /****************************************************************************
   * Private Types
   ****************************************************************************/
  
  /****************************************************************************
   * Private Function Prototypes
   ****************************************************************************/
  
  /****************************************************************************
   * Private Data
   ****************************************************************************/
  
  /****************************************************************************
   * Public Data
   ****************************************************************************/
  
  /****************************************************************************
   * Private Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: tc_main
   ****************************************************************************/
  
  #ifdef CONFIG_BUILD_KERNEL
  int main(int argc, FAR char *argv[])
  #else
  int tc_main(int argc, char *argv[])
  #endif
  {
  #ifdef CONFIG_EXAMPLES_TOUCHSCREEN_MOUSE
    struct mouse_report_s sample;
  #else
    struct touch_sample_s sample;
  #endif
    ssize_t nbytes;
  #if defined(CONFIG_NSH_BUILTIN_APPS) || CONFIG_EXAMPLES_TOUCHSCREEN_NSAMPLES > 0
    long nsamples;
  #endif
    int fd;
    int errval = 0;
  
    /* If this example is configured as an NX add-on, then limit the number of
     * samples that we collect before returning.  Otherwise, we never return
     */
  
  #if defined(CONFIG_NSH_BUILTIN_APPS)
    nsamples = 1;
    if (argc > 1)
      {
        nsamples = strtol(argv[1], NULL, 10);
      }
    printf("tc_main: nsamples: %d\n", nsamples);
  #elif CONFIG_EXAMPLES_TOUCHSCREEN_NSAMPLES > 0
    printf("tc_main: nsamples: %d\n", CONFIG_EXAMPLES_TOUCHSCREEN_NSAMPLES);
  #endif
  
    /* Open the touchscreen device for reading */
  
    printf("tc_main: Opening %s\n", CONFIG_EXAMPLES_TOUCHSCREEN_DEVPATH);
    fd = open(CONFIG_EXAMPLES_TOUCHSCREEN_DEVPATH, O_RDONLY);
    if (fd < 0)
      {
        printf("tc_main: open %s failed: %d\n",
                CONFIG_EXAMPLES_TOUCHSCREEN_DEVPATH, errno);
        errval = 2;
        goto errout;
      }
  
    /* Now loop the appropriate number of times, displaying the collected
     * touchscreen samples.
     */
  
  #if defined(CONFIG_NSH_BUILTIN_APPS)
    for (; nsamples > 0; nsamples--)
  #elif CONFIG_EXAMPLES_TOUCHSCREEN_NSAMPLES > 0
    for (nsamples = 0; nsamples < CONFIG_EXAMPLES_TOUCHSCREEN_NSAMPLES; nsamples++)
  #else
    for (;;)
  #endif
    {
      /* Flush any output before the loop entered or from the previous pass
       * through the loop.
       */
  
      fflush(stdout);
  
  #ifdef CONFIG_EXAMPLES_TOUCHSCREEN_MOUSE
      /* Read one sample */
  
      iinfo("Reading...\n");
      nbytes = read(fd, &sample, sizeof(struct mouse_report_s));
      iinfo("Bytes read: %d\n", nbytes);
  
      /* Handle unexpected return values */
  
      if (nbytes < 0)
        {
          errval = errno;
          if (errval != EINTR)
            {
              printf("tc_main: read %s failed: %d\n",
                     CONFIG_EXAMPLES_TOUCHSCREEN_DEVPATH, errval);
              errval = 3;
              goto errout_with_dev;
            }
  
          printf("tc_main: Interrupted read...\n");
        }
      else if (nbytes != sizeof(struct mouse_report_s))
        {
          printf("tc_main: Unexpected read size=%d, expected=%d, Ignoring\n",
                 nbytes, sizeof(struct mouse_report_s));
        }
  
      /* Print the sample data on successful return */
  
      else
        {
          printf("Sample     :\n");
          printf("   buttons : %02x\n", sample.buttons);
          printf("         x : %d\n",   sample.x);
          printf("         y : %d\n",   sample.y);
  #ifdef CONFIG_MOUSE_WHEEL
          printf("     wheel : %d\n",   sample.wheel);
  #endif
        }
  #else
      /* Read one sample */
  
      iinfo("Reading...\n");
      nbytes = read(fd, &sample, sizeof(struct touch_sample_s));
      iinfo("Bytes read: %d\n", nbytes);
  
      /* Handle unexpected return values */
  
      if (nbytes < 0)
        {
          errval = errno;
          if (errval != EINTR)
            {
              printf("tc_main: read %s failed: %d\n",
                     CONFIG_EXAMPLES_TOUCHSCREEN_DEVPATH, errval);
              errval = 3;
              goto errout_with_dev;
            }
  
          printf("tc_main: Interrupted read...\n");
        }
      else if (nbytes != sizeof(struct touch_sample_s))
        {
          printf("tc_main: Unexpected read size=%ld, expected=%d, Ignoring\n",
                 (long)nbytes, sizeof(struct touch_sample_s));
        }
  
      /* Print the sample data on successful return */
  
      else
        {
          printf("Sample     :\n");
          printf("   npoints : %d\n",   sample.npoints);
          printf("Point 1    :\n");
          printf("        id : %d\n",   sample.point[0].id);
          printf("     flags : %02x\n", sample.point[0].flags);
          printf("         x : %d\n",   sample.point[0].x);
          printf("         y : %d\n",   sample.point[0].y);
          printf("         h : %d\n",   sample.point[0].h);
          printf("         w : %d\n",   sample.point[0].w);
          printf("  pressure : %d\n",   sample.point[0].pressure);
        }
  #endif
    }
  
  errout_with_dev:
    close(fd);
  
  errout:
    printf("Terminating!\n");
    fflush(stdout);
    return errval;
  }
  