Watchdog Timer: basic support

Author: pennam

libraries/WDT/examples/WatchdogRefresh/WatchdogRefresh.ino

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+/*
+  Watchdog Refresh
+
+  This sketch shows how to enable the watchdog and
+  refresh the timer to avoid resets
+
+  Circuit:
+   - Portenta C33
+*/
+
+#include <WDT.h>
+
+void setup() {
+  Serial.begin(9600);
+  while (!Serial);
+
+  wdt_cfg_t p_cfg; 
+
+  p_cfg.timeout = WDT_TIMEOUT_16384;
+  p_cfg.clock_division = WDT_CLOCK_DIVISION_8192;
+  p_cfg.window_start = WDT_WINDOW_START_100;
+  p_cfg.window_end = WDT_WINDOW_END_0;
+  p_cfg.reset_control = WDT_RESET_CONTROL_RESET;
+  p_cfg.stop_control = WDT_STOP_CONTROL_ENABLE;
+
+  WDT.begin(p_cfg);
+}
+
+void loop() {
+  Serial.println("Still Alive...");
+  // Comment the line above to stop refreshing the watchdog
+  WDT.refresh();
+  delay(1000);
+}

libraries/WDT/library.properties

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+name=WDT
+version=0.0.1
+author=Arduino
+maintainer=Arduino <info@arduino.cc>
+sentence=Watchdog timer library for Renesas RA boards
+paragraph=
+category=Timing
+url=
+architectures=renesas

libraries/WDT/src/WDT.cpp

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+/*
+  WDT.cpp
+  Copyright (c) 2023 Arduino SA.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include "WDT.h"
+
+WDTimer::WDTimer() { }
+WDTimer::~WDTimer() { }
+
+int WDTimer::begin(wdt_cfg_t config)
+{
+    if(_is_initialized) {
+        return FSP_SUCCESS;
+    }
+
+    fsp_err_t err = R_WDT_Open(&_p_ctrl, &config);
+    if(FSP_SUCCESS == err ) {
+        R_WDT_Refresh(&_p_ctrl);
+        _is_initialized = true;
+    }
+
+    return (int)err;
+}
+
+void WDTimer::refresh()
+{
+    R_WDT_Refresh(&_p_ctrl);
+}
+
+WDTimer WDT;

libraries/WDT/src/WDT.h

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+/*
+  WDT.h
+  Copyright (c) 2023 Arduino SA.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#ifndef _WDTIMER_H_
+#define _WDTIMER_H_
+
+#include "r_wdt.h"
+
+class WDTimer {
+    private:
+    bool _is_initialized;
+    wdt_instance_ctrl_t _p_ctrl;
+
+    public:
+    WDTimer();
+    ~WDTimer();
+
+    int begin(wdt_cfg_t config);
+
+    void refresh();
+};
+
+extern WDTimer WDT;
+
+#endif