[SW WD] Count SW watchdog and feed HW watchdog

As suggested here: letscontrolit#2477

Author: TD-er

src/ESPEasy-Globals.h

@@ -1890,6 +1890,7 @@ float loop_usec_duration_total = 0.0;
 unsigned long countFindPluginId = 0;
 
 unsigned long dailyResetCounter = 0;
+volatile unsigned long sw_watchdog_callback_count = 0;
 
 String eventBuffer = "";
 

src/ESPEasy.ino

@@ -117,6 +117,15 @@ void preinit() {
 }
 #endif
 
+/*********************************************************************************************\
+ * ISR call back function for handling the watchdog.
+\*********************************************************************************************/
+void sw_watchdog_callback(void *arg) 
+{
+  yield(); // feed the WD
+  ++sw_watchdog_callback_count;
+}
+
 /*********************************************************************************************\
  * SETUP
 \*********************************************************************************************/
@@ -131,6 +140,9 @@ void setup()
   run_compiletime_checks();
   lowestFreeStack = getFreeStackWatermark();
   lowestRAM = FreeMem();
+#ifndef ESP32
+  ets_isr_attach(8, sw_watchdog_callback, NULL);  // Set a callback for feeding the watchdog.
+#endif
 
   resetPluginTaskData();
   Plugin_id.resize(PLUGIN_MAX);

src/StringProvider.ino

@@ -28,6 +28,8 @@ String getLabel(LabelType::Enum label) {
     case LabelType::BOOT_COUNT:             return F("Boot Count");
     case LabelType::RESET_REASON:           return F("Reset Reason");
     case LabelType::LAST_TASK_BEFORE_REBOOT: return F("Last Task");
+    case LabelType::SW_WD_COUNT:            return F("SW WD count");
+
 
     case LabelType::WIFI_CONNECTION:        return F("WiFi Connection");
     case LabelType::WIFI_RSSI:              return F("RSSI");
@@ -125,6 +127,7 @@ String getValue(LabelType::Enum label) {
     case LabelType::BOOT_COUNT:             break;
     case LabelType::RESET_REASON:           return getResetReasonString();
     case LabelType::LAST_TASK_BEFORE_REBOOT: return decodeSchedulerId(lastMixedSchedulerId_beforereboot);
+    case LabelType::SW_WD_COUNT:            return String(sw_watchdog_callback_count);
 
     case LabelType::WIFI_CONNECTION:        break;
     case LabelType::WIFI_RSSI:              return String(WiFi.RSSI());

src/StringProviderTypes.h

@@ -27,6 +27,7 @@ enum Enum : short {
   BOOT_COUNT,                  // 0
   RESET_REASON,                // Software/System restart
   LAST_TASK_BEFORE_REBOOT,     // Last scheduled task.
+  SW_WD_COUNT,
 
   WIFI_CONNECTION,             // 802.11G
   WIFI_RSSI,                   // -67

src/WebServer.ino

@@ -6867,6 +6867,7 @@ void handle_sysinfo() {
   TXBuffer += ')';
   addRowLabelValue(LabelType::RESET_REASON);
   addRowLabelValue(LabelType::LAST_TASK_BEFORE_REBOOT);
+  addRowLabelValue(LabelType::SW_WD_COUNT);
 
   addTableSeparator(F("Network"), 2, 3, F("Wifi"));