Add STM32 watchdog configuration

git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@4617 7fd9a85b-ad96-42d3-883c-3090e2eb8679

55 files changed, 681 insertions, 17 deletions

diff --git a/apps/ChangeLog.txt b/apps/ChangeLog.txt
index a70a9406d9..9dcb3ad1f5 100755
--- a/apps/ChangeLog.txt
+++ b/apps/ChangeLog.txt
@@ -225,4 +225,4 @@
 	* Kconfig:  Continued Kconfig file updates (no longer tracking on a per-file
 	  basis in the ChangeLog)
 	* apps/examples/watchdog:  Add a watchdog timer example.
-
+	* apps/examples/tiff:  Fix wrong path used for temporary file.
diff --git a/apps/examples/watchdog/watchdog.h b/apps/examples/watchdog/watchdog.h
index 1b36da9b4e..e5e906691a 100644
--- a/apps/examples/watchdog/watchdog.h
+++ b/apps/examples/watchdog/watchdog.h
@@ -118,7 +118,7 @@
  ****************************************************************************/
 
 /****************************************************************************
- * Name: watchdog_devinit()
+ * Name: up_wdginitialize()
  *
  * Description:
  *   Perform architecuture-specific initialization of the Watchdog hardware.
@@ -127,6 +127,6 @@
  *
  ****************************************************************************/
 
-int watchdog_devinit(void);
+int up_wdginitialize(void);
 
 #endif /* __APPS_EXAMPLES_WATCHDOG_WATCHDOG_H */
diff --git a/apps/examples/watchdog/watchdog_main.c b/apps/examples/watchdog/watchdog_main.c
index 6d1e1c43a2..819f2636fd 100644
--- a/apps/examples/watchdog/watchdog_main.c
+++ b/apps/examples/watchdog/watchdog_main.c
@@ -223,7 +223,7 @@ static void parse_args(FAR struct wdog_example_s *wdog, int argc, FAR char **arg
 int wdog_main(int argc, char *argv[])
 {
   struct wdog_example_s wdog;
-  uint32_t elapsed;
+  long elapsed;
   int fd;
   int ret;
 
@@ -235,10 +235,10 @@ int wdog_main(int argc, char *argv[])
    * this test.
    */
 
-  ret = watchdog_devinit();
+  ret = up_wdginitialize();
   if (ret != OK)
     {
-      message("wdog_main: watchdog_devinit failed: %d\n", ret);
+      message("wdog_main: up_wdginitialize failed: %d\n", ret);
       goto errout;
     }
 
@@ -251,8 +251,6 @@ int wdog_main(int argc, char *argv[])
               CONFIG_EXAMPLES_WATCHDOG_DEVPATH, errno);
       goto errout;
     }
-  message("wdog_main: starting output with frequency: %d duty: %08x count: %d\n",
-          info.frequency, info.duty, info.count);
 
   /* Set the watchdog timeout */
 
@@ -289,7 +287,7 @@ int wdog_main(int argc, char *argv[])
           goto errout_with_dev;
         }
 
-      message("  ping elapsed=%d\n", elpased);
+      message("  ping elapsed=%ld\n", elapsed);
       msgflush();
     }
 
@@ -301,7 +299,7 @@ int wdog_main(int argc, char *argv[])
 
       usleep(wdog.pingdelay * 1000);
 
-      message("  NO ping elapsed=%d\n", elpased);
+      message("  NO ping elapsed=%ld\n", elapsed);
       msgflush();
     }
 
diff --git a/apps/graphics/tiff/tiff_initialize.c b/apps/graphics/tiff/tiff_initialize.c
index 0e5b3229ce..3e1328eb2c 100644
--- a/apps/graphics/tiff/tiff_initialize.c
+++ b/apps/graphics/tiff/tiff_initialize.c
@@ -474,10 +474,10 @@ int tiff_initialize(FAR struct tiff_info_s *info)
       goto errout;
     }
 
-  info->tmp2fd = open(info->tmpfile1, O_RDWR|O_CREAT|O_TRUNC, 0666);
+  info->tmp2fd = open(info->tmpfile2, O_RDWR|O_CREAT|O_TRUNC, 0666);
   if (info->tmp2fd < 0)
     {
-      gdbg("Failed to open %s for reading/writing: %d\n", info->tmpfile1, errno);
+      gdbg("Failed to open %s for reading/writing: %d\n", info->tmpfile2, errno);
       goto errout;
     }
 
diff --git a/nuttx/Kconfig b/nuttx/Kconfig
index 74257cc464..ffd0125c20 100644
--- a/nuttx/Kconfig
+++ b/nuttx/Kconfig
@@ -233,6 +233,12 @@ config DEBUG_SPI
 	---help---
 		Enable I2C driver debug output (disabled by default)
 
+config DEBUG_WATCHDOG
+	bool "Enable watchdog timer debug output"
+	default n
+	---help---
+		Enable  watchdog timer debug output (disabled by default)
+
 endif
 
 config DEBUG_SYMBOLS
diff --git a/nuttx/configs/hymini-stm32v/README.txt b/nuttx/configs/hymini-stm32v/README.txt
index b50a33ccc0..cadd41acf5 100755
--- a/nuttx/configs/hymini-stm32v/README.txt
+++ b/nuttx/configs/hymini-stm32v/README.txt
@@ -363,7 +363,9 @@ HY-Mini specific Configuration Options
 	CONFIG_STM32_TIM5
 	CONFIG_STM32_TIM6
 	CONFIG_STM32_TIM7
+	CONFIG_STM32_IWDG
 	CONFIG_STM32_WWDG
+	CONFIG_STM32_IWDG
 	CONFIG_STM32_SPI2
 	CONFIG_STM32_SPI4
 	CONFIG_STM32_USART2
diff --git a/nuttx/configs/hymini-stm32v/buttons/defconfig b/nuttx/configs/hymini-stm32v/buttons/defconfig
index 2abd5cbaba..b9b4d59e01 100644
--- a/nuttx/configs/hymini-stm32v/buttons/defconfig
+++ b/nuttx/configs/hymini-stm32v/buttons/defconfig
@@ -119,6 +119,7 @@ CONFIG_STM32_TIM5=n
 CONFIG_STM32_TIM6=n
 CONFIG_STM32_TIM7=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI4=n
 CONFIG_STM32_USART2=y
diff --git a/nuttx/configs/hymini-stm32v/nsh/defconfig b/nuttx/configs/hymini-stm32v/nsh/defconfig
index bbb6c34a54..c89638f139 100755
--- a/nuttx/configs/hymini-stm32v/nsh/defconfig
+++ b/nuttx/configs/hymini-stm32v/nsh/defconfig
@@ -115,6 +115,7 @@ CONFIG_STM32_TIM5=n
 CONFIG_STM32_TIM6=n
 CONFIG_STM32_TIM7=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI4=n
 CONFIG_STM32_USART2=y
diff --git a/nuttx/configs/hymini-stm32v/nsh2/defconfig b/nuttx/configs/hymini-stm32v/nsh2/defconfig
index fea3b0283e..2bb9a8bf0e 100644
--- a/nuttx/configs/hymini-stm32v/nsh2/defconfig
+++ b/nuttx/configs/hymini-stm32v/nsh2/defconfig
@@ -116,6 +116,7 @@ CONFIG_STM32_TIM5=n
 CONFIG_STM32_TIM6=n
 CONFIG_STM32_TIM7=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI4=n
 CONFIG_STM32_USART2=n
diff --git a/nuttx/configs/hymini-stm32v/nx/defconfig b/nuttx/configs/hymini-stm32v/nx/defconfig
index 7058b5daa0..f19b0dfab1 100644
--- a/nuttx/configs/hymini-stm32v/nx/defconfig
+++ b/nuttx/configs/hymini-stm32v/nx/defconfig
@@ -115,6 +115,7 @@ CONFIG_STM32_TIM5=n
 CONFIG_STM32_TIM6=n
 CONFIG_STM32_TIM7=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI4=n
 CONFIG_STM32_USART2=y
diff --git a/nuttx/configs/hymini-stm32v/nxlines/defconfig b/nuttx/configs/hymini-stm32v/nxlines/defconfig
index 48ae3675ea..f25914704e 100644
--- a/nuttx/configs/hymini-stm32v/nxlines/defconfig
+++ b/nuttx/configs/hymini-stm32v/nxlines/defconfig
@@ -116,6 +116,7 @@ CONFIG_STM32_TIM5=n
 CONFIG_STM32_TIM6=n
 CONFIG_STM32_TIM7=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI4=n
 CONFIG_STM32_USART2=y
diff --git a/nuttx/configs/hymini-stm32v/src/Makefile b/nuttx/configs/hymini-stm32v/src/Makefile
index 5bb03930a4..fcfb670da8 100644
--- a/nuttx/configs/hymini-stm32v/src/Makefile
+++ b/nuttx/configs/hymini-stm32v/src/Makefile
@@ -1,7 +1,7 @@
 ############################################################################
 # configs/hymini-stm32v/src/Makefile
 #
-#   Copyright (C) 2009-2011 Gregory Nutt. All rights reserved.
+#   Copyright (C) 2009-2012 Gregory Nutt. All rights reserved.
 #   Author: Gregory Nutt <gnutt@nuttx.org>
 #           Laurent Latil <laurent@latil.nom.fr>
 #
@@ -59,6 +59,10 @@ ifeq ($(CONFIG_USBMSC),y)
 CSRCS		+= up_usbmsc.c
 endif
 
+ifeq ($(CONFIG_WATCHDOG),y)
+CSRCS		+= up_watchdog.c
+endif
+
 COBJS		= $(CSRCS:.c=$(OBJEXT))
 
 SRCS		= $(ASRCS) $(CSRCS)
diff --git a/nuttx/configs/hymini-stm32v/src/up_watchdog.c b/nuttx/configs/hymini-stm32v/src/up_watchdog.c
new file mode 100644
index 0000000000..638fae440b
--- /dev/null
+++ b/nuttx/configs/hymini-stm32v/src/up_watchdog.c
@@ -0,0 +1,136 @@
+/************************************************************************************
+ * configs/hymini-stm32v/src/up_watchdog.c
+ * arch/arm/src/board/up_watchdog.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 <errno.h>
+#include <debug.h>
+
+#include <nuttx/watchdog.h>
+#include <arch/board/board.h>
+
+#include "stm32_wdg.h"
+
+#ifdef CONFIG_WATCHDOG
+
+/************************************************************************************
+ * Definitions
+ ************************************************************************************/
+/* Configuration *******************************************************************/
+/* Wathdog hardware should be enabled */
+
+#if !defined(CONFIG_STM32_WWDG) && !defined(CONFIG_STM32_IWDG)
+#  warning "One of CONFIG_STM32_WWDG or CONFIG_STM32_IWDG must be defined"
+#endif
+
+/* Select the path to the registered watchdog timer device */
+
+#ifndef CONFIG_STM32_WDG_DEVPATH
+#  ifdef CONFIG_EXAMPLES_WATCHDOG_DEVPATH
+#    define CONFIG_STM32_WDG_DEVPATH CONFIG_EXAMPLES_WATCHDOG_DEVPATH
+#  else
+#    define CONFIG_STM32_WDG_DEVPATH "/dev/watchdog0"
+#  endif
+#endif
+
+/* Use the un-calibrated LSI frequency if we have nothing better */
+
+#if defined(CONFIG_STM32_IWDG) && !defined(CONFIG_STM32_LSIFREQ)
+#  define CONFIG_STM32_LSIFREQ STM32_LSI_FREQUENCY
+#endif
+
+/* Debug ***************************************************************************/
+/* Non-standard debug that may be enabled just for testing the watchdog timer */
+
+#ifndef CONFIG_DEBUG
+#  undef CONFIG_DEBUG_WATCHDOG
+#endif
+
+#ifdef CONFIG_DEBUG_WATCHDOG
+#  define wdgdbg                 dbg
+#  define wdglldbg               lldbg
+#  ifdef CONFIG_DEBUG_VERBOSE
+#    define wdgvdbg              vdbg
+#    define wdgllvdbg            llvdbg
+#  else
+#    define wdgvdbg(x...)
+#    define wdgllvdbg(x...)
+#  endif
+#else
+#  define wdgdbg(x...)
+#  define wdglldbg(x...)
+#  define wdgvdbg(x...)
+#  define wdgllvdbg(x...)
+#endif
+
+/************************************************************************************
+ * Private Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+/****************************************************************************
+ * Name: up_wdginitialize()
+ *
+ * Description:
+ *   Perform architecuture-specific initialization of the Watchdog hardware.
+ *   This interface must be provided by all configurations using
+ *   apps/examples/watchdog
+ *
+ ****************************************************************************/
+
+int up_wdginitialize(void)
+{
+  /* Initialize tha register the watchdog timer device */
+
+#if defined(CONFIG_STM32_WWDG)
+  stm32_wwdginitialize(CONFIG_STM32_WDG_DEVPATH);
+  return OK;
+#elif defined(CONFIG_STM32_IWDG)
+  stm32_iwdginitialize(CONFIG_STM32_WDG_DEVPATH, CONFIG_STM32_LSIFREQ);
+  return OK;
+#else
+  return -ENODEV;
+#endif
+}
+
+#endif /* CONFIG_WATCHDOG */
diff --git a/nuttx/configs/hymini-stm32v/usbserial/defconfig b/nuttx/configs/hymini-stm32v/usbserial/defconfig
index b594aba6d1..1a9a6ab288 100755
--- a/nuttx/configs/hymini-stm32v/usbserial/defconfig
+++ b/nuttx/configs/hymini-stm32v/usbserial/defconfig
@@ -118,6 +118,7 @@ CONFIG_STM32_TIM5=n
 CONFIG_STM32_TIM6=n
 CONFIG_STM32_TIM7=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI4=n
 CONFIG_STM32_USART2=y
diff --git a/nuttx/configs/hymini-stm32v/usbstorage/defconfig b/nuttx/configs/hymini-stm32v/usbstorage/defconfig
index c5c0fca11b..758d087b27 100755
--- a/nuttx/configs/hymini-stm32v/usbstorage/defconfig
+++ b/nuttx/configs/hymini-stm32v/usbstorage/defconfig
@@ -116,6 +116,7 @@ CONFIG_STM32_TIM5=n
 CONFIG_STM32_TIM6=n
 CONFIG_STM32_TIM7=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI4=n
 CONFIG_STM32_USART2=y
diff --git a/nuttx/configs/stm3210e-eval/README.txt b/nuttx/configs/stm3210e-eval/README.txt
index c356a17d5c..9d7c077e88 100755
--- a/nuttx/configs/stm3210e-eval/README.txt
+++ b/nuttx/configs/stm3210e-eval/README.txt
@@ -464,6 +464,7 @@ STM3210E-EVAL-specific Configuration Options
     CONFIG_STM32_TIM6
     CONFIG_STM32_TIM7
     CONFIG_STM32_WWDG
+    CONFIG_STM32_IWDG
     CONFIG_STM32_SPI2
     CONFIG_STM32_SPI4
     CONFIG_STM32_USART2
diff --git a/nuttx/configs/stm3210e-eval/RIDE/defconfig b/nuttx/configs/stm3210e-eval/RIDE/defconfig
index c091d0eb2f..8566de22e0 100755
--- a/nuttx/configs/stm3210e-eval/RIDE/defconfig
+++ b/nuttx/configs/stm3210e-eval/RIDE/defconfig
@@ -123,6 +123,7 @@ CONFIG_STM32_TIM5=n
 CONFIG_STM32_TIM6=n
 CONFIG_STM32_TIM7=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI4=n
 CONFIG_STM32_USART2=y
diff --git a/nuttx/configs/stm3210e-eval/buttons/defconfig b/nuttx/configs/stm3210e-eval/buttons/defconfig
index c257d36063..694b9bd25c 100644
--- a/nuttx/configs/stm3210e-eval/buttons/defconfig
+++ b/nuttx/configs/stm3210e-eval/buttons/defconfig
@@ -135,6 +135,7 @@ CONFIG_STM32_TIM5=n
 CONFIG_STM32_TIM6=n
 CONFIG_STM32_TIM7=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI4=n
 CONFIG_STM32_USART2=y
diff --git a/nuttx/configs/stm3210e-eval/composite/defconfig b/nuttx/configs/stm3210e-eval/composite/defconfig
index 3eb19f9651..57a4c07931 100755
--- a/nuttx/configs/stm3210e-eval/composite/defconfig
+++ b/nuttx/configs/stm3210e-eval/composite/defconfig
@@ -131,6 +131,7 @@ CONFIG_STM32_TIM5=n
 CONFIG_STM32_TIM6=n
 CONFIG_STM32_TIM7=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI4=n
 CONFIG_STM32_USART2=y
diff --git a/nuttx/configs/stm3210e-eval/nsh/defconfig b/nuttx/configs/stm3210e-eval/nsh/defconfig
index c81961169f..39adad92f1 100755
--- a/nuttx/configs/stm3210e-eval/nsh/defconfig
+++ b/nuttx/configs/stm3210e-eval/nsh/defconfig
@@ -131,6 +131,7 @@ CONFIG_STM32_TIM5=n
 CONFIG_STM32_TIM6=n
 CONFIG_STM32_TIM7=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI4=n
 CONFIG_STM32_USART2=y
diff --git a/nuttx/configs/stm3210e-eval/nsh2/defconfig b/nuttx/configs/stm3210e-eval/nsh2/defconfig
index 3924412dff..8ad609818a 100644
--- a/nuttx/configs/stm3210e-eval/nsh2/defconfig
+++ b/nuttx/configs/stm3210e-eval/nsh2/defconfig
@@ -152,6 +152,7 @@ CONFIG_STM32_TIM5=n
 CONFIG_STM32_TIM6=n
 CONFIG_STM32_TIM7=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI4=n
 CONFIG_STM32_USART2=y
diff --git a/nuttx/configs/stm3210e-eval/nx/defconfig b/nuttx/configs/stm3210e-eval/nx/defconfig
index c01e283c34..359cf81500 100644
--- a/nuttx/configs/stm3210e-eval/nx/defconfig
+++ b/nuttx/configs/stm3210e-eval/nx/defconfig
@@ -131,6 +131,7 @@ CONFIG_STM32_TIM5=n
 CONFIG_STM32_TIM6=n
 CONFIG_STM32_TIM7=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI4=n
 CONFIG_STM32_USART2=y
diff --git a/nuttx/configs/stm3210e-eval/nxconsole/defconfig b/nuttx/configs/stm3210e-eval/nxconsole/defconfig
index 6b19bcde2c..4c04af5146 100644
--- a/nuttx/configs/stm3210e-eval/nxconsole/defconfig
+++ b/nuttx/configs/stm3210e-eval/nxconsole/defconfig
@@ -131,6 +131,7 @@ CONFIG_STM32_TIM5=n
 CONFIG_STM32_TIM6=n
 CONFIG_STM32_TIM7=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI4=n
 CONFIG_STM32_USART2=y
diff --git a/nuttx/configs/stm3210e-eval/nxlines/defconfig b/nuttx/configs/stm3210e-eval/nxlines/defconfig
index 6eda159515..8139b7107a 100644
--- a/nuttx/configs/stm3210e-eval/nxlines/defconfig
+++ b/nuttx/configs/stm3210e-eval/nxlines/defconfig
@@ -131,6 +131,7 @@ CONFIG_STM32_TIM5=n
 CONFIG_STM32_TIM6=n
 CONFIG_STM32_TIM7=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI4=n
 CONFIG_STM32_USART2=y
diff --git a/nuttx/configs/stm3210e-eval/nxtext/defconfig b/nuttx/configs/stm3210e-eval/nxtext/defconfig
index 38f0ca0749..3045de58eb 100644
--- a/nuttx/configs/stm3210e-eval/nxtext/defconfig
+++ b/nuttx/configs/stm3210e-eval/nxtext/defconfig
@@ -131,6 +131,7 @@ CONFIG_STM32_TIM5=n
 CONFIG_STM32_TIM6=n
 CONFIG_STM32_TIM7=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI4=n
 CONFIG_STM32_USART2=y
diff --git a/nuttx/configs/stm3210e-eval/ostest/defconfig b/nuttx/configs/stm3210e-eval/ostest/defconfig
index 0beef4d988..62ec95cf46 100755
--- a/nuttx/configs/stm3210e-eval/ostest/defconfig
+++ b/nuttx/configs/stm3210e-eval/ostest/defconfig
@@ -133,6 +133,7 @@ CONFIG_STM32_TIM5=n
 CONFIG_STM32_TIM6=n
 CONFIG_STM32_TIM7=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI4=n
 CONFIG_STM32_USART2=y
diff --git a/nuttx/configs/stm3210e-eval/src/Makefile b/nuttx/configs/stm3210e-eval/src/Makefile
index db5710c08e..be12a216fc 100644
--- a/nuttx/configs/stm3210e-eval/src/Makefile
+++ b/nuttx/configs/stm3210e-eval/src/Makefile
@@ -72,6 +72,10 @@ ifeq ($(CONFIG_CAN),y)
 CSRCS		+= up_can.c
 endif
 
+ifeq ($(CONFIG_WATCHDOG),y)
+CSRCS		+= up_watchdog.c
+endif
+
 COBJS		= $(CSRCS:.c=$(OBJEXT))
 
 SRCS		= $(ASRCS) $(CSRCS)
diff --git a/nuttx/configs/stm3210e-eval/src/up_watchdog.c b/nuttx/configs/stm3210e-eval/src/up_watchdog.c
new file mode 100644
index 0000000000..0c09f75495
--- /dev/null
+++ b/nuttx/configs/stm3210e-eval/src/up_watchdog.c
@@ -0,0 +1,136 @@
+/************************************************************************************
+ * configs/stm3210e-eval/src/up_watchdog.c
+ * arch/arm/src/board/up_watchdog.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 <errno.h>
+#include <debug.h>
+
+#include <nuttx/watchdog.h>
+#include <arch/board/board.h>
+
+#include "stm32_wdg.h"
+
+#ifdef CONFIG_WATCHDOG
+
+/************************************************************************************
+ * Definitions
+ ************************************************************************************/
+/* Configuration *******************************************************************/
+/* Wathdog hardware should be enabled */
+
+#if !defined(CONFIG_STM32_WWDG) && !defined(CONFIG_STM32_IWDG)
+#  warning "One of CONFIG_STM32_WWDG or CONFIG_STM32_IWDG must be defined"
+#endif
+
+/* Select the path to the registered watchdog timer device */
+
+#ifndef CONFIG_STM32_WDG_DEVPATH
+#  ifdef CONFIG_EXAMPLES_WATCHDOG_DEVPATH
+#    define CONFIG_STM32_WDG_DEVPATH CONFIG_EXAMPLES_WATCHDOG_DEVPATH
+#  else
+#    define CONFIG_STM32_WDG_DEVPATH "/dev/watchdog0"
+#  endif
+#endif
+
+/* Use the un-calibrated LSI frequency if we have nothing better */
+
+#if defined(CONFIG_STM32_IWDG) && !defined(CONFIG_STM32_LSIFREQ)
+#  define CONFIG_STM32_LSIFREQ STM32_LSI_FREQUENCY
+#endif
+
+/* Debug ***************************************************************************/
+/* Non-standard debug that may be enabled just for testing the watchdog timer */
+
+#ifndef CONFIG_DEBUG
+#  undef CONFIG_DEBUG_WATCHDOG
+#endif
+
+#ifdef CONFIG_DEBUG_WATCHDOG
+#  define wdgdbg                 dbg
+#  define wdglldbg               lldbg
+#  ifdef CONFIG_DEBUG_VERBOSE
+#    define wdgvdbg              vdbg
+#    define wdgllvdbg            llvdbg
+#  else
+#    define wdgvdbg(x...)
+#    define wdgllvdbg(x...)
+#  endif
+#else
+#  define wdgdbg(x...)
+#  define wdglldbg(x...)
+#  define wdgvdbg(x...)
+#  define wdgllvdbg(x...)
+#endif
+
+/************************************************************************************
+ * Private Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+/****************************************************************************
+ * Name: up_wdginitialize()
+ *
+ * Description:
+ *   Perform architecuture-specific initialization of the Watchdog hardware.
+ *   This interface must be provided by all configurations using
+ *   apps/examples/watchdog
+ *
+ ****************************************************************************/
+
+int up_wdginitialize(void)
+{
+  /* Initialize tha register the watchdog timer device */
+
+#if defined(CONFIG_STM32_WWDG)
+  stm32_wwdginitialize(CONFIG_STM32_WDG_DEVPATH);
+  return OK;
+#elif defined(CONFIG_STM32_IWDG)
+  stm32_iwdginitialize(CONFIG_STM32_WDG_DEVPATH, CONFIG_STM32_LSIFREQ);
+  return OK;
+#else
+  return -ENODEV;
+#endif
+}
+
+#endif /* CONFIG_WATCHDOG */
diff --git a/nuttx/configs/stm3210e-eval/usbserial/defconfig b/nuttx/configs/stm3210e-eval/usbserial/defconfig
index d9f2bc89a6..e9f1fea16c 100755
--- a/nuttx/configs/stm3210e-eval/usbserial/defconfig
+++ b/nuttx/configs/stm3210e-eval/usbserial/defconfig
@@ -133,6 +133,7 @@ CONFIG_STM32_TIM5=n
 CONFIG_STM32_TIM6=n
 CONFIG_STM32_TIM7=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI4=n
 CONFIG_STM32_USART2=y
diff --git a/nuttx/configs/stm3210e-eval/usbstorage/defconfig b/nuttx/configs/stm3210e-eval/usbstorage/defconfig
index 494c3f7e8a..82752bbde6 100755
--- a/nuttx/configs/stm3210e-eval/usbstorage/defconfig
+++ b/nuttx/configs/stm3210e-eval/usbstorage/defconfig
@@ -131,6 +131,7 @@ CONFIG_STM32_TIM5=n
 CONFIG_STM32_TIM6=n
 CONFIG_STM32_TIM7=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI4=n
 CONFIG_STM32_USART2=y
diff --git a/nuttx/configs/stm3220g-eval/README.txt b/nuttx/configs/stm3220g-eval/README.txt
index 794d03241b..327280050b 100644
--- a/nuttx/configs/stm3220g-eval/README.txt
+++ b/nuttx/configs/stm3220g-eval/README.txt
@@ -460,6 +460,7 @@ STM3220G-EVAL-specific Configuration Options
 	CONFIG_STM32_TIM13
 	CONFIG_STM32_TIM14
 	CONFIG_STM32_WWDG
+	CONFIG_STM32_IWDG
 	CONFIG_STM32_SPI2
 	CONFIG_STM32_SPI3
 	CONFIG_STM32_USART2
diff --git a/nuttx/configs/stm3220g-eval/dhcpd/defconfig b/nuttx/configs/stm3220g-eval/dhcpd/defconfig
index 7306bbd7f0..db436c2364 100644
--- a/nuttx/configs/stm3220g-eval/dhcpd/defconfig
+++ b/nuttx/configs/stm3220g-eval/dhcpd/defconfig
@@ -172,6 +172,7 @@ CONFIG_STM32_TIM12=n
 CONFIG_STM32_TIM13=n
 CONFIG_STM32_TIM14=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI3=n
 CONFIG_STM32_USART2=n
diff --git a/nuttx/configs/stm3220g-eval/nettest/defconfig b/nuttx/configs/stm3220g-eval/nettest/defconfig
index 7f43244a3a..e54c502cc7 100644
--- a/nuttx/configs/stm3220g-eval/nettest/defconfig
+++ b/nuttx/configs/stm3220g-eval/nettest/defconfig
@@ -172,6 +172,7 @@ CONFIG_STM32_TIM12=n
 CONFIG_STM32_TIM13=n
 CONFIG_STM32_TIM14=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI3=n
 CONFIG_STM32_USART2=n
diff --git a/nuttx/configs/stm3220g-eval/nsh/defconfig b/nuttx/configs/stm3220g-eval/nsh/defconfig
index 5e63d03faf..5d793f3548 100644
--- a/nuttx/configs/stm3220g-eval/nsh/defconfig
+++ b/nuttx/configs/stm3220g-eval/nsh/defconfig
@@ -172,6 +172,7 @@ CONFIG_STM32_TIM12=n
 CONFIG_STM32_TIM13=n
 CONFIG_STM32_TIM14=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI3=n
 CONFIG_STM32_USART2=n
diff --git a/nuttx/configs/stm3220g-eval/nsh2/defconfig b/nuttx/configs/stm3220g-eval/nsh2/defconfig
index 62afbf9c2a..df5a0e8d10 100644
--- a/nuttx/configs/stm3220g-eval/nsh2/defconfig
+++ b/nuttx/configs/stm3220g-eval/nsh2/defconfig
@@ -173,6 +173,7 @@ CONFIG_STM32_TIM12=n
 CONFIG_STM32_TIM13=n
 CONFIG_STM32_TIM14=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI3=n
 CONFIG_STM32_USART2=n
diff --git a/nuttx/configs/stm3220g-eval/ostest/defconfig b/nuttx/configs/stm3220g-eval/ostest/defconfig
index 2ed18f0fce..9859b0f9c2 100644
--- a/nuttx/configs/stm3220g-eval/ostest/defconfig
+++ b/nuttx/configs/stm3220g-eval/ostest/defconfig
@@ -172,6 +172,7 @@ CONFIG_STM32_TIM12=n
 CONFIG_STM32_TIM13=n
 CONFIG_STM32_TIM14=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI3=n
 CONFIG_STM32_USART2=n
diff --git a/nuttx/configs/stm3220g-eval/src/Makefile b/nuttx/configs/stm3220g-eval/src/Makefile
index b79189cb1b..af845744bf 100644
--- a/nuttx/configs/stm3220g-eval/src/Makefile
+++ b/nuttx/configs/stm3220g-eval/src/Makefile
@@ -80,8 +80,8 @@ ifeq ($(CONFIG_NSH_ARCHINIT),y)
 CSRCS		+= up_nsh.c
 endif
 
-ifeq ($(CONFIG_ARCH_FPU),y)
-CSRCS		+= up_ostest.c
+ifeq ($(CONFIG_WATCHDOG),y)
+CSRCS		+= up_watchdog.c
 endif
 
 COBJS		= $(CSRCS:.c=$(OBJEXT))
diff --git a/nuttx/configs/stm3220g-eval/src/up_watchdog.c b/nuttx/configs/stm3220g-eval/src/up_watchdog.c
new file mode 100644
index 0000000000..d8b635982e
--- /dev/null
+++ b/nuttx/configs/stm3220g-eval/src/up_watchdog.c
@@ -0,0 +1,136 @@
+/************************************************************************************
+ * configs/stm3220g-eval/src/up_watchdog.c
+ * arch/arm/src/board/up_watchdog.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 <errno.h>
+#include <debug.h>
+
+#include <nuttx/watchdog.h>
+#include <arch/board/board.h>
+
+#include "stm32_wdg.h"
+
+#ifdef CONFIG_WATCHDOG
+
+/************************************************************************************
+ * Definitions
+ ************************************************************************************/
+/* Configuration *******************************************************************/
+/* Wathdog hardware should be enabled */
+
+#if !defined(CONFIG_STM32_WWDG) && !defined(CONFIG_STM32_IWDG)
+#  warning "One of CONFIG_STM32_WWDG or CONFIG_STM32_IWDG must be defined"
+#endif
+
+/* Select the path to the registered watchdog timer device */
+
+#ifndef CONFIG_STM32_WDG_DEVPATH
+#  ifdef CONFIG_EXAMPLES_WATCHDOG_DEVPATH
+#    define CONFIG_STM32_WDG_DEVPATH CONFIG_EXAMPLES_WATCHDOG_DEVPATH
+#  else
+#    define CONFIG_STM32_WDG_DEVPATH "/dev/watchdog0"
+#  endif
+#endif
+
+/* Use the un-calibrated LSI frequency if we have nothing better */
+
+#if defined(CONFIG_STM32_IWDG) && !defined(CONFIG_STM32_LSIFREQ)
+#  define CONFIG_STM32_LSIFREQ STM32_LSI_FREQUENCY
+#endif
+
+/* Debug ***************************************************************************/
+/* Non-standard debug that may be enabled just for testing the watchdog timer */
+
+#ifndef CONFIG_DEBUG
+#  undef CONFIG_DEBUG_WATCHDOG
+#endif
+
+#ifdef CONFIG_DEBUG_WATCHDOG
+#  define wdgdbg                 dbg
+#  define wdglldbg               lldbg
+#  ifdef CONFIG_DEBUG_VERBOSE
+#    define wdgvdbg              vdbg
+#    define wdgllvdbg            llvdbg
+#  else
+#    define wdgvdbg(x...)
+#    define wdgllvdbg(x...)
+#  endif
+#else
+#  define wdgdbg(x...)
+#  define wdglldbg(x...)
+#  define wdgvdbg(x...)
+#  define wdgllvdbg(x...)
+#endif
+
+/************************************************************************************
+ * Private Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+/****************************************************************************
+ * Name: up_wdginitialize()
+ *
+ * Description:
+ *   Perform architecuture-specific initialization of the Watchdog hardware.
+ *   This interface must be provided by all configurations using
+ *   apps/examples/watchdog
+ *
+ ****************************************************************************/
+
+int up_wdginitialize(void)
+{
+  /* Initialize tha register the watchdog timer device */
+
+#if defined(CONFIG_STM32_WWDG)
+  stm32_wwdginitialize(CONFIG_STM32_WDG_DEVPATH);
+  return OK;
+#elif defined(CONFIG_STM32_IWDG)
+  stm32_iwdginitialize(CONFIG_STM32_WDG_DEVPATH, CONFIG_STM32_LSIFREQ);
+  return OK;
+#else
+  return -ENODEV;
+#endif
+}
+
+#endif /* CONFIG_WATCHDOG */
diff --git a/nuttx/configs/stm3220g-eval/telnetd/defconfig b/nuttx/configs/stm3220g-eval/telnetd/defconfig
index 854e5631ad..12e036d9fe 100644
--- a/nuttx/configs/stm3220g-eval/telnetd/defconfig
+++ b/nuttx/configs/stm3220g-eval/telnetd/defconfig
@@ -171,6 +171,7 @@ CONFIG_STM32_TIM12=n
 CONFIG_STM32_TIM13=n
 CONFIG_STM32_TIM14=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI3=n
 CONFIG_STM32_USART2=n
diff --git a/nuttx/configs/stm3240g-eval/README.txt b/nuttx/configs/stm3240g-eval/README.txt
index 5b5c627496..1fb7d6ff43 100755
--- a/nuttx/configs/stm3240g-eval/README.txt
+++ b/nuttx/configs/stm3240g-eval/README.txt
@@ -630,6 +630,7 @@ STM3240G-EVAL-specific Configuration Options
     CONFIG_STM32_TIM13
     CONFIG_STM32_TIM14
     CONFIG_STM32_WWDG
+    CONFIG_STM32_IWDG
     CONFIG_STM32_SPI2
     CONFIG_STM32_SPI3
     CONFIG_STM32_USART2
diff --git a/nuttx/configs/stm3240g-eval/dhcpd/defconfig b/nuttx/configs/stm3240g-eval/dhcpd/defconfig
index 0759f8469f..90d910c4ef 100644
--- a/nuttx/configs/stm3240g-eval/dhcpd/defconfig
+++ b/nuttx/configs/stm3240g-eval/dhcpd/defconfig
@@ -174,6 +174,7 @@ CONFIG_STM32_TIM12=n
 CONFIG_STM32_TIM13=n
 CONFIG_STM32_TIM14=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI3=n
 CONFIG_STM32_USART2=n
diff --git a/nuttx/configs/stm3240g-eval/nettest/defconfig b/nuttx/configs/stm3240g-eval/nettest/defconfig
index 309a49e3ce..af31d91020 100644
--- a/nuttx/configs/stm3240g-eval/nettest/defconfig
+++ b/nuttx/configs/stm3240g-eval/nettest/defconfig
@@ -174,6 +174,7 @@ CONFIG_STM32_TIM12=n
 CONFIG_STM32_TIM13=n
 CONFIG_STM32_TIM14=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI3=n
 CONFIG_STM32_USART2=n
diff --git a/nuttx/configs/stm3240g-eval/nsh/defconfig b/nuttx/configs/stm3240g-eval/nsh/defconfig
index fca94b2136..66bf400770 100644
--- a/nuttx/configs/stm3240g-eval/nsh/defconfig
+++ b/nuttx/configs/stm3240g-eval/nsh/defconfig
@@ -174,6 +174,7 @@ CONFIG_STM32_TIM12=n
 CONFIG_STM32_TIM13=n
 CONFIG_STM32_TIM14=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI3=n
 CONFIG_STM32_USART2=n
diff --git a/nuttx/configs/stm3240g-eval/nsh2/defconfig b/nuttx/configs/stm3240g-eval/nsh2/defconfig
index 13c58788c0..1ffc6ecd69 100644
--- a/nuttx/configs/stm3240g-eval/nsh2/defconfig
+++ b/nuttx/configs/stm3240g-eval/nsh2/defconfig
@@ -175,6 +175,7 @@ CONFIG_STM32_TIM12=n
 CONFIG_STM32_TIM13=n
 CONFIG_STM32_TIM14=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI3=n
 CONFIG_STM32_USART2=n
diff --git a/nuttx/configs/stm3240g-eval/ostest/defconfig b/nuttx/configs/stm3240g-eval/ostest/defconfig
index 54d393f89b..b5c3844735 100644
--- a/nuttx/configs/stm3240g-eval/ostest/defconfig
+++ b/nuttx/configs/stm3240g-eval/ostest/defconfig
@@ -174,6 +174,7 @@ CONFIG_STM32_TIM12=n
 CONFIG_STM32_TIM13=n
 CONFIG_STM32_TIM14=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI3=n
 CONFIG_STM32_USART2=n
diff --git a/nuttx/configs/stm3240g-eval/src/Makefile b/nuttx/configs/stm3240g-eval/src/Makefile
index e28eff4eb1..1f532b4c0a 100644
--- a/nuttx/configs/stm3240g-eval/src/Makefile
+++ b/nuttx/configs/stm3240g-eval/src/Makefile
@@ -84,6 +84,10 @@ ifeq ($(CONFIG_ARCH_FPU),y)
 CSRCS		+= up_ostest.c
 endif
 
+ifeq ($(CONFIG_WATCHDOG),y)
+CSRCS		+= up_watchdog.c
+endif
+
 COBJS		= $(CSRCS:.c=$(OBJEXT))
 
 SRCS		= $(ASRCS) $(CSRCS)
diff --git a/nuttx/configs/stm3240g-eval/telnetd/defconfig b/nuttx/configs/stm3240g-eval/telnetd/defconfig
index c894455e23..befd642648 100644
--- a/nuttx/configs/stm3240g-eval/telnetd/defconfig
+++ b/nuttx/configs/stm3240g-eval/telnetd/defconfig
@@ -174,6 +174,7 @@ CONFIG_STM32_TIM12=n
 CONFIG_STM32_TIM13=n
 CONFIG_STM32_TIM14=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI3=n
 CONFIG_STM32_USART2=n
diff --git a/nuttx/configs/stm32f4discovery/README.txt b/nuttx/configs/stm32f4discovery/README.txt
index d9720fdf27..1ad1a2e0b1 100755
--- a/nuttx/configs/stm32f4discovery/README.txt
+++ b/nuttx/configs/stm32f4discovery/README.txt
@@ -633,6 +633,7 @@ STM32F4Discovery-specific Configuration Options
     CONFIG_STM32_TIM13
     CONFIG_STM32_TIM14
     CONFIG_STM32_WWDG
+    CONFIG_STM32_IWDG
     CONFIG_STM32_SPI2
     CONFIG_STM32_SPI3
     CONFIG_STM32_USART2
@@ -835,3 +836,10 @@ Where <subdir> is one of the following:
        Special PWM-only debug options:
 
        CONFIG_DEBUG_QENCODER
+
+    3. This examples supports the watchdog timer test (apps/examples/watchdog)
+       buty this must be manually enabled by selecting:
+
+       CONFIG_WATCHDOG=y         : Enables watchdog timer driver support
+       CONFIG_STM32_WWDG=y       : Enables the WWDG timer facility, OR
+       CONFIG_STM32_IWDG=y       : Enables the IWDG timer facility (but not both)
diff --git a/nuttx/configs/stm32f4discovery/nsh/appconfig b/nuttx/configs/stm32f4discovery/nsh/appconfig
index c6532241e7..097948c875 100644
--- a/nuttx/configs/stm32f4discovery/nsh/appconfig
+++ b/nuttx/configs/stm32f4discovery/nsh/appconfig
@@ -61,3 +61,7 @@ ifeq ($(CONFIG_CDCACM),y)
 CONFIGURED_APPS += examples/cdcacm
 endif
 endif
+
+ifeq ($(CONFIG_WATCHDOG),y)
+CONFIGURED_APPS += examples/watchdog
+endif
diff --git a/nuttx/configs/stm32f4discovery/nsh/defconfig b/nuttx/configs/stm32f4discovery/nsh/defconfig
index c77b32ccb2..0e09e1a1f5 100755
--- a/nuttx/configs/stm32f4discovery/nsh/defconfig
+++ b/nuttx/configs/stm32f4discovery/nsh/defconfig
@@ -151,6 +151,7 @@ CONFIG_STM32_TIM12=n
 CONFIG_STM32_TIM13=n
 CONFIG_STM32_TIM14=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI3=n
 CONFIG_STM32_USART2=y
@@ -1011,6 +1012,18 @@ CONFIG_USBMSC_VERSIONNO=0x0399
 CONFIG_USBMSC_REMOVABLE=y
 
 #
+# Watchdog timer configuration
+#
+# CONFIG_WATCHDOG - Enable overall watchdog timer driver support.
+#
+# The STM32 also needs one of the following enabled:
+#
+#  CONFIG_STM32_WWDG=y, OR
+#  CONFIG_STM32_IWDG=y (but not both)
+#
+CONFIG_WATCHDOG=n
+
+#
 # Graphics related configuration settings
 #
 # CONFIG_NX
@@ -1356,6 +1369,41 @@ CONFIG_EXAMPLES_CDCACM_TRACEINTERRUPTS=n
 #    as a percentage.  Default: 5 seconds
 
 #
+# Settings for examples/watchdog
+#
+
+# This test depends on these specific Watchdog/NSH configurations settings (your
+# specific watchdog hardware settings might require additional settings).
+#
+#   CONFIG_WATCHDOG- Enables watchdog timer support support.
+#   CONFIG_NSH_BUILTIN_APPS - Build the watchdog time test as an NSH
+#     built-in function. Default: Not built!  The example can only be used
+#     as an NSH built-in application
+#
+# The STM32 also needs one of the following enabled:
+#
+#  CONFIG_STM32_WWDG=y, OR
+#  CONFIG_STM32_IWDG=y (but not both)
+#
+# Specific configuration options for this example include:
+#
+# CONFIG_EXAMPLES_WATCHDOG_DEVPATH - The path to the Watchdog device.
+#   Default: /dev/watchdog0
+# CONFIG_EXAMPLES_WATCHDOG_PINGTIME - Time in milliseconds that the example
+#   will ping the watchdog before letting the watchdog expire. Default: 5000
+#   milliseconds
+# CONFIG_EXAMPLES_WATCHDOG_PINGDELAY - Time delay between pings in
+#   milliseconds. Default: 500 milliseconds.
+# CONFIG_EXAMPLES_WATCHDOG_TIMEOUT - The watchdog timeout value in
+#   milliseconds before the watchdog timer expires.  Default:  2000
+#   milliseconds.
+#
+# CONFIG_EXAMPLES_WATCHDOG_DEVPATH
+# CONFIG_EXAMPLES_WATCHDOG_PINGTIME
+# CONFIG_EXAMPLES_WATCHDOG_PINGDELAY
+# CONFIG_EXAMPLES_WATCHDOG_TIMEOUT
+
+#
 # Stack and heap information
 #
 # CONFIG_BOOT_RUNFROMFLASH - Some configurations support XIP
diff --git a/nuttx/configs/stm32f4discovery/ostest/defconfig b/nuttx/configs/stm32f4discovery/ostest/defconfig
index 35858b6bdc..b6cf8b9bdd 100755
--- a/nuttx/configs/stm32f4discovery/ostest/defconfig
+++ b/nuttx/configs/stm32f4discovery/ostest/defconfig
@@ -151,6 +151,7 @@ CONFIG_STM32_TIM12=n
 CONFIG_STM32_TIM13=n
 CONFIG_STM32_TIM14=n
 CONFIG_STM32_WWDG=n
+CONFIG_STM32_IWDG=n
 CONFIG_STM32_SPI2=n
 CONFIG_STM32_SPI3=n
 CONFIG_STM32_USART2=y
diff --git a/nuttx/configs/stm32f4discovery/src/Makefile b/nuttx/configs/stm32f4discovery/src/Makefile
index 55db39d031..b5f449a47b 100644
--- a/nuttx/configs/stm32f4discovery/src/Makefile
+++ b/nuttx/configs/stm32f4discovery/src/Makefile
@@ -68,6 +68,10 @@ ifeq ($(CONFIG_QENCODER),y)
 CSRCS		+= up_qencoder.c
 endif
 
+ifeq ($(CONFIG_WATCHDOG),y)
+CSRCS		+= up_watchdog.c
+endif
+
 COBJS		= $(CSRCS:.c=$(OBJEXT))
 
 SRCS		= $(ASRCS) $(CSRCS)
diff --git a/nuttx/configs/stm32f4discovery/src/up_watchdog.c b/nuttx/configs/stm32f4discovery/src/up_watchdog.c
new file mode 100644
index 0000000000..4bef40f783
--- /dev/null
+++ b/nuttx/configs/stm32f4discovery/src/up_watchdog.c
@@ -0,0 +1,136 @@
+/************************************************************************************
+ * configs/stm32f4discovery/src/up_watchdog.c
+ * arch/arm/src/board/up_watchdog.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 <errno.h>
+#include <debug.h>
+
+#include <nuttx/watchdog.h>
+#include <arch/board/board.h>
+
+#include "stm32_wdg.h"
+
+#ifdef CONFIG_WATCHDOG
+
+/************************************************************************************
+ * Definitions
+ ************************************************************************************/
+/* Configuration *******************************************************************/
+/* Wathdog hardware should be enabled */
+
+#if !defined(CONFIG_STM32_WWDG) && !defined(CONFIG_STM32_IWDG)
+#  warning "One of CONFIG_STM32_WWDG or CONFIG_STM32_IWDG must be defined"
+#endif
+
+/* Select the path to the registered watchdog timer device */
+
+#ifndef CONFIG_STM32_WDG_DEVPATH
+#  ifdef CONFIG_EXAMPLES_WATCHDOG_DEVPATH
+#    define CONFIG_STM32_WDG_DEVPATH CONFIG_EXAMPLES_WATCHDOG_DEVPATH
+#  else
+#    define CONFIG_STM32_WDG_DEVPATH "/dev/watchdog0"
+#  endif
+#endif
+
+/* Use the un-calibrated LSI frequency if we have nothing better */
+
+#if defined(CONFIG_STM32_IWDG) && !defined(CONFIG_STM32_LSIFREQ)
+#  define CONFIG_STM32_LSIFREQ STM32_LSI_FREQUENCY
+#endif
+
+/* Debug ***************************************************************************/
+/* Non-standard debug that may be enabled just for testing the watchdog timer */
+
+#ifndef CONFIG_DEBUG
+#  undef CONFIG_DEBUG_WATCHDOG
+#endif
+
+#ifdef CONFIG_DEBUG_WATCHDOG
+#  define wdgdbg                 dbg
+#  define wdglldbg               lldbg
+#  ifdef CONFIG_DEBUG_VERBOSE
+#    define wdgvdbg              vdbg
+#    define wdgllvdbg            llvdbg
+#  else
+#    define wdgvdbg(x...)
+#    define wdgllvdbg(x...)
+#  endif
+#else
+#  define wdgdbg(x...)
+#  define wdglldbg(x...)
+#  define wdgvdbg(x...)
+#  define wdgllvdbg(x...)
+#endif
+
+/************************************************************************************
+ * Private Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+/****************************************************************************
+ * Name: up_wdginitialize()
+ *
+ * Description:
+ *   Perform architecuture-specific initialization of the Watchdog hardware.
+ *   This interface must be provided by all configurations using
+ *   apps/examples/watchdog
+ *
+ ****************************************************************************/
+
+int up_wdginitialize(void)
+{
+  /* Initialize tha register the watchdog timer device */
+
+#if defined(CONFIG_STM32_WWDG)
+  stm32_wwdginitialize(CONFIG_STM32_WDG_DEVPATH);
+  return OK;
+#elif defined(CONFIG_STM32_IWDG)
+  stm32_iwdginitialize(CONFIG_STM32_WDG_DEVPATH, CONFIG_STM32_LSIFREQ);
+  return OK;
+#else
+  return -ENODEV;
+#endif
+}
+
+#endif /* CONFIG_WATCHDOG */
diff --git a/nuttx/drivers/watchdog.c b/nuttx/drivers/watchdog.c
index 2f2f22ce63..d7ee303654 100644
--- a/nuttx/drivers/watchdog.c
+++ b/nuttx/drivers/watchdog.c
@@ -478,6 +478,7 @@ FAR void *watchdog_register(FAR const char *path,
   int ret;
 
   DEBUGASSERT(path && lower);
+  wdvdbg("Registering: %s\n", path);
 
   /* Allocate the upper-half data structure */
 
@@ -548,14 +549,14 @@ void watchdog_unregister(FAR void *handle)
   FAR struct watchdog_upperhalf_s *upper;
   FAR struct watchdog_lowerhalf_s *lower;
 
-  wdvdbg("cmd: %d arg: %ld\n", cmd, arg);
-
   /* Recover the pointer to the upper-half driver state */
 
   upper = (FAR struct watchdog_upperhalf_s *)handle;
   lower = upper->lower;
   DEBUGASSERT(upper && lower);
 
+  wdvdbg("Unregistering: %s\n", upper->path);
+
   /* Disable the watchdog timer */
 
   DEBUGASSERT(lower->ops->stop); /* Required */
diff --git a/nuttx/include/nuttx/watchdog.h b/nuttx/include/nuttx/watchdog.h
index 83219caf22..2372b2411e 100755
--- a/nuttx/include/nuttx/watchdog.h
+++ b/nuttx/include/nuttx/watchdog.h
@@ -41,6 +41,8 @@
  ****************************************************************************/
 
 #include <nuttx/config.h>
+#include <nuttx/compiler.h>
+#include <nuttx/irq.h>
 #include <nuttx/fs/ioctl.h>
 
 #ifdef CONFIG_WATCHDOG