arch/arm/src/lpc43xx: Add Windowed Watchdog Timer (WWDT) driver. Tested on LPC4357 but should be

compatible for all LPC43xx MCUs.

arch/arm/src/lpc43xx/Make.defs

@@ -112,6 +112,10 @@ ifeq ($(CONFIG_LPC43_GPIO_IRQ),y)
 CHIP_CSRCS += lpc43_gpioint.c
 endif
 
+ifeq ($(CONFIG_LPC43_WWDT),y)
+CHIP_CSRCS += lpc43_wwdt.c
+endif
+
 ifeq ($(CONFIG_LPC43_ETHERNET),y)
 CHIP_CSRCS += lpc43_ethernet.c
 endif

arch/arm/src/lpc43xx/lpc43_wdt.h

@@ -0,0 +1,97 @@
+/****************************************************************************
+ * arch/arm/src/lpc43xx/lpc43_wdt.h
+ *
+ *   Copyright (C) 2012, 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.
+ *
+ ****************************************************************************/
+
+#ifndef __ARCH_ARM_SRC_LPC43XX_CHIP_LPC43_WDT_H
+#define __ARCH_ARM_SRC_LPC43XX_CHIP_LPC43_WDT_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include "chip.h"
+#include "chip/lpc43_wdt.h"
+
+#ifdef CONFIG_WATCHDOG
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#ifndef __ASSEMBLY__
+
+#undef EXTERN
+#if defined(__cplusplus)
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lpc43_wwtginitialize
+ *
+ * Description:
+ *   Initialize the WWDG watchdog time.  The watchdog timer is initializeed and
+ *   registers as 'devpath.  The initial state of the watchdog time is
+ *   disabled.
+ *
+ * Input Parameters:
+ *   devpath - The full path to the watchdog.  This should be of the form
+ *     /dev/watchdog0
+ *
+ * Returned Values:
+ *   None
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_LPC43_WWDT
+void lpc43_wwdtinitialize(FAR const char *devpath);
+#endif
+
+#undef EXTERN
+#if defined(__cplusplus)
+}
+#endif
+
+#endif /* __ASSEMBLY__ */
+#endif /* CONFIG_WATCHDOG */
+#endif /* __ARCH_ARM_SRC_LPC43XX_CHIP_LPC43_WDT_H */