Add a watchdog module to meshsolar. (#9337)

* add watchdog module

* Restore the code in power.h

---------

Co-authored-by: Ben Meadors <benmmeadors@gmail.com>

src/watchdog/watchdogThread.cpp

@@ -0,0 +1,37 @@
+#include "watchdogThread.h"
+#include "configuration.h"
+
+#ifdef HAS_HARDWARE_WATCHDOG
+WatchdogThread *watchdogThread;
+
+WatchdogThread::WatchdogThread() : OSThread("Watchdog")
+{
+    setup();
+}
+
+void WatchdogThread::feedDog(void)
+{   
+    digitalWrite(HARDWARE_WATCHDOG_DONE, HIGH);
+    delay(1);
+    digitalWrite(HARDWARE_WATCHDOG_DONE, LOW);
+}
+
+int32_t WatchdogThread::runOnce()
+{
+    LOG_DEBUG("Feeding hardware watchdog");
+    feedDog();
+    return HARDWARE_WATCHDOG_TIMEOUT_MS;
+}
+
+bool WatchdogThread::setup()
+{
+    LOG_DEBUG("init hardware watchdog");
+    pinMode(HARDWARE_WATCHDOG_WAKE, INPUT);
+    pinMode(HARDWARE_WATCHDOG_DONE, OUTPUT);
+    delay(1);
+    digitalWrite(HARDWARE_WATCHDOG_DONE, LOW);
+    delay(1);
+    feedDog();
+    return true;
+}
+#endif

src/watchdog/watchdogThread.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <stdint.h>
+#include "concurrency/OSThread.h"
+
+#ifdef HAS_HARDWARE_WATCHDOG
+class WatchdogThread : private concurrency::OSThread
+{
+  public:
+
+    WatchdogThread();
+    void feedDog(void);
+    virtual bool setup();
+    virtual int32_t runOnce() override;
+
+};
+
+extern WatchdogThread *watchdogThread;
+#endif