Add an instance of ExternalWatchdogManager to Tower V2

variants/heltec_tower_v2/target.cpp

@@ -14,6 +14,7 @@ VolatileRTCClock fallback_clock;
 AutoDiscoverRTCClock rtc_clock(fallback_clock);
 MicroNMEALocationProvider nmea = MicroNMEALocationProvider(Serial1, &rtc_clock);
 EnvironmentSensorManager sensors = EnvironmentSensorManager(nmea);
+TowerV2ExternalWatchdog external_watchdog;
 
 #ifdef DISPLAY_CLASS
 DISPLAY_CLASS display;
@@ -29,3 +30,35 @@ mesh::LocalIdentity radio_new_identity() {
   RadioNoiseListener rng(radio);
   return mesh::LocalIdentity(&rng);
 }
+
+bool TowerV2ExternalWatchdog::begin() {
+  last_feed_watchdog = 0;
+  pinMode(EXTERNAL_WATCHDOG_WAKE_PIN, INPUT);
+  pinMode(EXTERNAL_WATCHDOG_DONE_PIN, OUTPUT);
+  delay(1);
+  digitalWrite(EXTERNAL_WATCHDOG_DONE_PIN, LOW);
+  delay(1);
+  feed();
+  return true;
+}
+
+void TowerV2ExternalWatchdog::loop() {
+  if (millis() - last_feed_watchdog >= EXTERNAL_WATCHDOG_FEED_INTERVAL_MS) {
+    feed();
+  }
+}
+
+unsigned long TowerV2ExternalWatchdog::getIntervalMs() const {
+  unsigned long elapsed_ms = millis() - last_feed_watchdog;
+  if (elapsed_ms >= EXTERNAL_WATCHDOG_FEED_INTERVAL_MS) {
+    return 0;
+  }
+  return EXTERNAL_WATCHDOG_FEED_INTERVAL_MS - elapsed_ms;
+}
+
+void TowerV2ExternalWatchdog::feed() {
+  digitalWrite(EXTERNAL_WATCHDOG_DONE_PIN, HIGH);
+  delay(1);
+  digitalWrite(EXTERNAL_WATCHDOG_DONE_PIN, LOW);
+  last_feed_watchdog = millis();
+}

variants/heltec_tower_v2/target.h

@@ -8,16 +8,27 @@
 #include <helpers/radiolib/RadioLibWrappers.h>
 #include <helpers/sensors/EnvironmentSensorManager.h>
 #include <helpers/sensors/LocationProvider.h>
+#include <helpers/ExternalWatchdogManager.h>
 
 #ifdef DISPLAY_CLASS
 #include <helpers/ui/MomentaryButton.h>
 #include "helpers/ui/NullDisplayDriver.h"
 #endif
 
+class TowerV2ExternalWatchdog : public ExternalWatchdogManager {
+public:
+    TowerV2ExternalWatchdog() {}
+    bool begin() override;
+    void loop() override;
+    unsigned long getIntervalMs() const override;
+    void feed() override;
+};
+
 extern HeltecTowerV2Board board;
 extern WRAPPER_CLASS radio_driver;
 extern AutoDiscoverRTCClock rtc_clock;
 extern EnvironmentSensorManager sensors;
+extern TowerV2ExternalWatchdog external_watchdog;
 
 #ifdef DISPLAY_CLASS
 extern DISPLAY_CLASS display;

variants/heltec_tower_v2/variant.h

@@ -85,7 +85,7 @@
 #define HAS_EXTERNAL_WATCHDOG
 #define EXTERNAL_WATCHDOG_DONE_PIN (0 + 9)
 #define EXTERNAL_WATCHDOG_WAKE_PIN (0 + 10)
-#define EXTERNAL_WATCHDOG_FEED_INTERNAL_MS (8 * 60 * 1000)
+#define EXTERNAL_WATCHDOG_FEED_INTERVAL_MS (8 * 60 * 1000)
 
 #define SERIAL_PRINT_PORT 0