Start implementing watchdog timer

src/main.c

@@ -33,6 +33,24 @@ int Init(void)
 
 	Info("Initializing...");
 
+	// The watchdog timer is clocked from a separate
+	// on-chip oscillator which runs at 1MHz. Eight
+	// different clock cycle periods can be selected
+	// to determine the reset period. If the reset
+	// period expires, the chip resets and executes
+	// from the reset vector.
+
+	// The update loop must call WDT_Reset to reset
+	// the timer, kind of like a dead man's switch
+	// allowing us to detect infinite loops and any
+	// other error that halts execution.
+
+	if (WDT_HasTriggered())
+		Info("Unexpected system reset.");
+
+	// WDT_Enable();
+	// WDT_SetTimeout(7);
+
 	// There is a possiblity to use interrupt signals
 	// for I2C communication but only as one large
 	// branching routine for the whole I2C system.
@@ -80,6 +98,8 @@ void Update(void)
 	float temp[3], rhum[3];
 	short raw[4];
 
+	WDT_Reset(); // Reset watchdog
+
 	Info("Reading sensor values...");
 
 	I2C_SetChannel(AHT01);