Add watchdog timer to STM32 code #262

Author: stuartpittaway

STM32All-In-One/src/main.cpp

@@ -37,6 +37,8 @@ extern "C"
   void SystemClock_Config(void);
 }
 
+#include <IWatchdog.h>
+
 #include "SPI.h"
 #include <SerialEncoder.h>
 #include "packet_processor.h"
@@ -496,6 +498,9 @@ void setup()
 {
   SystemClock_Config();
 
+  // Initialize the IWDG with 4 seconds timeout.  This would cause a CPU reset if the IWDG timer is not reloaded in approximately 4 seconds.
+  IWatchdog.begin(4000000);
+
   configurePins();
   DisableThermistorPower();
 
@@ -967,10 +972,12 @@ void ServiceSerialPort()
   }
 }
 
-
 void loop()
 {
 
+  // make sure the code in this loop is executed in less than 2 seconds to leave 50% headroom for the timer reload.
+  IWatchdog.reload();
+
   // Temperature sensor readings...
   EnableThermistorPower();
   TakeExternalTempMeasurements(celldata);
@@ -1079,5 +1086,4 @@ void loop()
     delay(2);
     countdown--;
   }
-
 }