Add SMT32F4xxx Watchdog driver

platforms/nuttx/src/px4/stm/stm32f4/CMakeLists.txt

@@ -46,4 +46,5 @@ add_subdirectory(../stm32_common/tone_alarm tone_alarm)
 add_subdirectory(../stm32_common/version version)
 
 add_subdirectory(px4io_serial)
+add_subdirectory(watchdog)
 

platforms/nuttx/src/px4/stm/stm32f4/watchdog/CMakeLists.txt

@@ -0,0 +1,36 @@
+############################################################################
+#
+#   Copyright (c) 2021 PX4 Development Team. All rights reserved.
+#
+# 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 PX4 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.
+#
+############################################################################
+
+px4_add_library(arch_watchdog_iwdg
+	iwdg.c
+)

platforms/nuttx/src/px4/stm/stm32f4/watchdog/iwdg.c

@@ -0,0 +1,102 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2021 PX4 Development Team. All rights reserved.
+ *       Author: David Sidrane <david.sidrane@nscdg.com>
+ *
+ * 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 PX4 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.
+ *
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include "chip.h"
+#include "stm32.h"
+#include <hardware/stm32_wdg.h>
+#include "nvic.h"
+
+/****************************************************************************
+ * Name: watchdog_pet()
+ *
+ * Description:
+ *   This function resets the Independent watchdog (IWDG)
+ *
+ *
+ * Input Parameters:
+ *   none.
+ *
+ * Returned value:
+ *   none.
+ *
+ ****************************************************************************/
+
+void watchdog_pet(void)
+{
+	putreg32(IWDG_KR_KEY_RELOAD, STM32_IWDG_KR);
+}
+
+/****************************************************************************
+ * Name: watchdog_init()
+ *
+ * Description:
+ *   This function initialize the Independent watchdog (IWDG)
+ *
+ *
+ * Input Parameters:
+ *   none.
+ *
+ * Returned value:
+ *   none.
+ *
+ ****************************************************************************/
+
+void watchdog_init(void)
+{
+#if defined(CONFIG_STM32_JTAG_FULL_ENABLE) || \
+    defined(CONFIG_STM32_JTAG_NOJNTRST_ENABLE) || \
+    defined(CONFIG_STM32_JTAG_SW_ENABLE)
+	putreg32(getreg32(STM32_DBGMCU_APB1_FZ) | DBGMCU_APB1_IWDGSTOP, STM32_DBGMCU_APB1_FZ);
+#endif
+
+	/* unlock */
+
+	putreg32(IWDG_KR_KEY_ENABLE, STM32_IWDG_KR);
+
+	/* Set the prescale value */
+
+	putreg32(IWDG_PR_DIV16, STM32_IWDG_PR);
+
+	/* Set the reload value */
+
+	putreg32(IWDG_RLR_MAX, STM32_IWDG_RLR);
+
+	/* Start the watch dog */
+
+	putreg32(IWDG_KR_KEY_START, STM32_IWDG_KR);
+
+	watchdog_pet();
+}

src/drivers/drv_watchdog.h

@@ -0,0 +1,49 @@
+/****************************************************************************
+ *
+ *   Copyright (C) 2021 PX4 Development Team. All rights reserved.
+ *
+ * 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 PX4 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.
+ *
+ ****************************************************************************/
+
+/**
+ * @file drv_watchdog.h
+ *
+ *  watchdog driver interface.
+ *
+ */
+
+#pragma once
+
+#include <stdint.h>
+
+__BEGIN_DECLS
+
+void watchdog_init(void);
+void watchdog_pet(void);
+__END_DECLS