Clean up watchdog impl.

Marlin/Marlin_main.cpp

@@ -45,13 +45,16 @@
 #include "stepper.h"
 #include "temperature.h"
 #include "cardreader.h"
-#include "watchdog.h"
 #include "configuration_store.h"
 #include "language.h"
 #include "pins_arduino.h"
 #include "math.h"
 #include "buzzer.h"
 
+#if ENABLED(USE_WATCHDOG)
+  #include "watchdog.h"
+#endif
+
 #if ENABLED(BLINKM)
   #include "blinkm.h"
   #include "Wire.h"
@@ -681,7 +684,11 @@ void setup() {
 
   tp_init();    // Initialize temperature loop
   plan_init();  // Initialize planner;
+
+  #if ENABLED(USE_WATCHDOG)
     watchdog_init();
+  #endif
+
   st_init();    // Initialize stepper, this enables interrupts!
   setup_photpin();
   servo_init();

Marlin/temperature.cpp

@@ -21,11 +21,13 @@
 #include "Marlin.h"
 #include "ultralcd.h"
 #include "temperature.h"
-#include "watchdog.h"
 #include "language.h"
-
 #include "Sd2PinMap.h"
 
+#if ENABLED(USE_WATCHDOG)
+  #include "watchdog.h"
+#endif
+
 //===========================================================================
 //================================== macros =================================
 //===========================================================================
@@ -819,8 +821,11 @@ static void updateTemperaturesFromRawValues() {
   #if HAS_FILAMENT_SENSOR
     filament_width_meas = analog2widthFil();
   #endif
+
+  #if ENABLED(USE_WATCHDOG)
     // Reset the watchdog after we know we have a temperature measurement.
     watchdog_reset();
+  #endif
 
   CRITICAL_SECTION_START;
   temp_meas_ready = false;

Marlin/watchdog.cpp

@@ -1,21 +1,10 @@
 #include "Marlin.h"
 
 #if ENABLED(USE_WATCHDOG)
-#include <avr/wdt.h>
 
 #include "watchdog.h"
-#include "ultralcd.h"
 
-//===========================================================================
-//============================ private variables ============================
-//===========================================================================
-
-//===========================================================================
-//================================ functions ================================
-//===========================================================================
-
-
-/// intialise watch dog with a 4 sec interrupt time
+// Initialize watchdog with a 4 sec interrupt time
 void watchdog_init() {
   #if ENABLED(WATCHDOG_RESET_MANUAL)
     // We enable the watchdog timer, but only for the interrupt.
@@ -28,11 +17,6 @@ void watchdog_init() {
   #endif
 }
 
-/// reset watchdog. MUST be called every 1s after init or avr will reset.
-void watchdog_reset() {
-  wdt_reset();
-}
-
 //===========================================================================
 //=================================== ISR ===================================
 //===========================================================================
@@ -45,6 +29,6 @@ ISR(WDT_vect) {
     kill(PSTR("ERR:Please Reset")); //kill blocks //16 characters so it fits on a 16x2 display
     while (1); //wait for user or serial reset
   }
-#endif//RESET_MANUAL
+#endif //WATCHDOG_RESET_MANUAL
 
 #endif //USE_WATCHDOG

Marlin/watchdog.h

@@ -2,16 +2,13 @@
 #define WATCHDOG_H
 
 #include "Marlin.h"
+#include <avr/wdt.h>
 
-#if ENABLED(USE_WATCHDOG)
-  // initialize watch dog with a 1 sec interrupt time
+// Initialize watchdog with a 4 second interrupt time
 void watchdog_init();
-  // pad the dog/reset watchdog. MUST be called at least every second after the first watchdog_init or AVR will go into emergency procedures..
-  void watchdog_reset();
-#else
-  //If we do not have a watchdog, then we can have empty functions which are optimized away.
-  FORCE_INLINE void watchdog_init() {};
-  FORCE_INLINE void watchdog_reset() {};
-#endif
+
+// Reset watchdog. MUST be called at least every 4 seconds after the
+// first watchdog_init or AVR will go into emergency procedures.
+inline void watchdog_reset() { wdt_reset(); }
 
 #endif