1 files changed, 357 insertions, 0 deletions
diff --git a/apps/examples/watchdog/watchdog_main.c b/apps/examples/watchdog/watchdog_main.c
new file mode 100644
index 000000000..c1341e0fb
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+++ b/apps/examples/watchdog/watchdog_main.c
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+/****************************************************************************
+ * examples/watchdog/watchdog_main.c
+ *
+ *   Copyright (C) 2012 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 <sys/ioctl.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <debug.h>
+
+#include <nuttx/watchdog.h>
+
+#include "watchdog.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+struct wdog_example_s
+{
+  uint32_t pingtime;
+  uint32_t pingdelay;
+  uint32_t timeout;
+};
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: wdog_help
+ ****************************************************************************/
+
+static void wdog_help(void)
+{
+  message("Usage: wdog [-h] [-d <pingtime] [-p <pingdelay>] [-t <timeout>]\n");
+  message("\nInitialize the watchdog to the <timeout>.  Start the watchdog\n");
+  message("timer.  Ping for the watchdog for <pingtime> seconds, then let it expire.\n");
+  message("\nOptions include:\n");
+  message("  [-d <pingtime>] = Selects the <delay> time in milliseconds.  Default: %d\n",
+         CONFIG_EXAMPLES_WATCHDOG_PINGTIME);
+  message("  [-p <pingdelay] = Time delay between pings in milliseconds.  Default: %d\n",
+         CONFIG_EXAMPLES_WATCHDOG_PINGDELAY);
+  message("  [-t timeout] = Time in milliseconds that the example will ping the watchdog\n");
+  message("    before letting the watchdog expire. Default: %d\n",
+          CONFIG_EXAMPLES_WATCHDOG_TIMEOUT);
+  message("  [-h] = Shows this message and exits\n");
+}
+
+/****************************************************************************
+ * Name: arg_string
+ ****************************************************************************/
+
+static int arg_string(FAR char **arg, FAR char **value)
+{
+  FAR char *ptr = *arg;
+
+  if (ptr[2] == '\0')
+    {
+      *value = arg[1];
+      return 2;
+    }
+  else
+    {
+      *value = &ptr[2];
+      return 1;
+    }
+}
+
+/****************************************************************************
+ * Name: arg_decimal
+ ****************************************************************************/
+
+static int arg_decimal(FAR char **arg, FAR long *value)
+{
+  FAR char *string;
+  int ret;
+
+  ret = arg_string(arg, &string);
+  *value = strtol(string, NULL, 10);
+  return ret;
+}
+
+/****************************************************************************
+ * Name: parse_args
+ ****************************************************************************/
+
+static void parse_args(FAR struct wdog_example_s *wdog, int argc, FAR char **argv)
+{
+  FAR char *ptr;
+  long value;
+  int index;
+  int nargs;
+ 
+  wdog->pingtime  = CONFIG_EXAMPLES_WATCHDOG_PINGTIME;
+  wdog->pingdelay = CONFIG_EXAMPLES_WATCHDOG_PINGDELAY;
+  wdog->timeout   = CONFIG_EXAMPLES_WATCHDOG_TIMEOUT;
+
+  for (index = 1; index < argc; )
+    {
+      ptr = argv[index];
+      if (ptr[0] != '-')
+        {
+          message("Invalid options format: %s\n", ptr);
+          exit(EXIT_SUCCESS);
+        }
+
+      switch (ptr[1])
+        {
+          case 'd':
+            nargs = arg_decimal(&argv[index], &value);
+            if (value < 1)
+              {
+                message("Ping delay out of range: %ld\n", value);
+                exit(EXIT_FAILURE);
+              }
+
+            wdog->pingdelay = (uint32_t)value;
+            index += nargs;
+            break;
+
+          case 'p':
+            nargs = arg_decimal(&argv[index], &value);
+            if (value < 1 || value > 99)
+              {
+                message("Ping time out of range: %ld\n", value);
+                exit(EXIT_FAILURE);
+              }
+
+            wdog->pingtime = (uint8_t)value;
+            index += nargs;
+            break;
+
+          case 't':
+            nargs = arg_decimal(&argv[index], &value);
+            if (value < 1 || value > INT_MAX)
+              {
+                message("Duration out of range: %ld\n", value);
+                exit(EXIT_FAILURE);
+              }
+
+            wdog->timeout = (int)value;
+            index += nargs;
+            break;
+
+          case 'h':
+            wdog_help();
+            exit(EXIT_SUCCESS);
+        
+          default:
+            message("Unsupported option: %s\n", ptr);
+            wdog_help();
+            exit(EXIT_FAILURE);
+        }
+    }
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: user_start/wdog_main
+ ****************************************************************************/
+
+int wdog_main(int argc, char *argv[])
+{
+  struct wdog_example_s wdog;
+#ifdef CONFIG_DEBUG_WATCHDOG
+  struct watchdog_status_s status;
+#endif
+  long elapsed;
+  int fd;
+  int ret;
+
+  /* Parse the command line */
+
+  parse_args(&wdog, argc, argv);
+
+  /* Initialization of the WATCHDOG hardware is performed by logic external to
+   * this test.
+   */
+
+  ret = up_wdginitialize();
+  if (ret != OK)
+    {
+      message("wdog_main: up_wdginitialize failed: %d\n", ret);
+      goto errout;
+    }
+
+  /* Open the watchdog device for reading */
+
+  fd = open(CONFIG_EXAMPLES_WATCHDOG_DEVPATH, O_RDONLY);
+  if (fd < 0)
+    {
+      message("wdog_main: open %s failed: %d\n",
+              CONFIG_EXAMPLES_WATCHDOG_DEVPATH, errno);
+      goto errout;
+    }
+
+  /* Set the watchdog timeout */
+
+  ret = ioctl(fd, WDIOC_SETTIMEOUT, (unsigned long)wdog.timeout);
+  if (ret < 0)
+    {
+      message("wdog_main: ioctl(WDIOC_SETTIMEOUT) failed: %d\n", errno);
+      goto errout_with_dev;
+    }
+
+  /* Then start the watchdog timer. */
+
+  ret = ioctl(fd, WDIOC_START, 0);
+  if (ret < 0)
+    {
+      message("wdog_main: ioctl(WDIOC_START) failed: %d\n", errno);
+      goto errout_with_dev;
+    }
+
+  /* Then ping */
+
+  for (elapsed = 0; elapsed < wdog.pingtime; elapsed += wdog.pingdelay)
+    {
+      /* Sleep for the requested amount of time */
+
+      usleep(wdog.pingdelay * 1000);
+
+      /* Show watchdog status.  Only if debug is enabled because this
+       * could interfere with the timer.
+       */
+
+#ifdef CONFIG_DEBUG_WATCHDOG
+     ret = ioctl(fd, WDIOC_GETSTATUS, (unsigned long)&status);
+     if (ret < 0)
+       {
+          message("wdog_main: ioctl(WDIOC_GETSTATUS) failed: %d\n", errno);
+          goto errout_with_dev;
+        }
+      message("wdog_main: flags=%08x timeout=%d timeleft=%d\n",
+              status.flags, status.timeout, status.timeleft);
+#endif
+
+      /* Then ping */
+
+     ret = ioctl(fd, WDIOC_KEEPALIVE, 0);
+     if (ret < 0)
+       {
+          message("wdog_main: ioctl(WDIOC_KEEPALIVE) failed: %d\n", errno);
+          goto errout_with_dev;
+        }
+
+      message("  ping elapsed=%ld\n", elapsed);
+      msgflush();
+    }
+
+  /* Then stop pinging */
+
+  for (; ; elapsed += wdog.pingdelay)
+    {
+      /* Sleep for the requested amount of time */
+
+      usleep(wdog.pingdelay * 1000);
+
+      /* Show watchdog status.  Only if debug is enabled because this
+       * could interfere with the timer.
+       */
+
+#ifdef CONFIG_DEBUG_WATCHDOG
+     ret = ioctl(fd, WDIOC_GETSTATUS, (unsigned long)&status);
+     if (ret < 0)
+       {
+          message("wdog_main: ioctl(WDIOC_GETSTATUS) failed: %d\n", errno);
+          goto errout_with_dev;
+        }
+      message("wdog_main: flags=%08x timeout=%d timeleft=%d\n",
+              status.flags, status.timeout, status.timeleft);
+#endif
+
+      message("  NO ping elapsed=%ld\n", elapsed);
+      msgflush();
+    }
+
+  /* We should not get here */
+
+  ret = ioctl(fd, WDIOC_STOP, 0);
+  if (ret < 0)
+    {
+      message("wdog_main: ioctl(WDIOC_STOP) failed: %d\n", errno);
+      goto errout_with_dev;
+    }
+
+ close(fd);
+ msgflush();
+ return OK;
+
+errout_with_dev:
+  close(fd);
+errout:
+  msgflush();
+  return ERROR;
+}