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/modules/Modules.cpp

@@ -91,6 +91,9 @@
 #include "modules/DropzoneModule.h"
 #endif
 
+#if defined(HAS_HARDWARE_WATCHDOG)
+#include "watchdog/watchdogThread.h"
+#endif
 /**
  * Create module instances here.  If you are adding a new module, you must 'new' it here (or somewhere else)
  */
@@ -229,6 +232,9 @@ void setupModules()
 #if !MESHTASTIC_EXCLUDE_RANGETEST && !MESHTASTIC_EXCLUDE_GPS
     if (moduleConfig.has_range_test && moduleConfig.range_test.enabled)
         new RangeTestModule();
+#endif
+#if defined(HAS_HARDWARE_WATCHDOG)
+    watchdogThread = new WatchdogThread();
 #endif
     // NOTE! This module must be added LAST because it likes to check for replies from other modules and avoid sending extra
     // acks

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