Combine thermal runaway and watch-period

- Make thermal protection for all hotends and/or bed into simple
switches
- Now enable `WATCH_TEMP_PERIOD` when `THERMAL_PROTECTION_HOTENDS` is
enabled
- Move detailed thermal parameters to `Configuration_adv.h`
- Add sanity checks to warn about old configurations
- Change `WATCH_TEMP_PERIOD` to seconds instead of milliseconds

Marlin/example_configurations/delta/generic/Configuration.h

@@ -300,23 +300,10 @@ Here are some standard links for getting your machine calibrated:
  * The solution: Once the temperature reaches the target, start observing.
  * If the temperature stays too far below the target (hysteresis) for too long,
  * the firmware will halt as a safety precaution.
- *
- * Note that because the countdown starts only AFTER the temperature reaches
- * the target, this will not catch a thermistor that is already disconnected
- * when the print starts!
- *
- * To enable for all extruder heaters, uncomment the two defines below:
  */
 
-// Parameters for all extruder heaters
-#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 // in seconds
-#define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 4 // in degree Celsius
-
-// To enable for the bed heater, uncomment the two defines below:
-
-// Parameters for the bed heater
-#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 // in seconds
-#define THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS 2 // in degree Celsius
+#define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
+#define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
 
 //===========================================================================
 //============================= Mechanical Settings =========================

Marlin/example_configurations/delta/generic/Configuration_adv.h

@@ -15,16 +15,37 @@
 #define BED_CHECK_INTERVAL 5000 //ms between checks in bang-bang control
 
 /**
- * Heating Sanity Check
- *
- * Whenever an M104 or M109 increases the target temperature this will wait for WATCH_TEMP_PERIOD milliseconds,
- * and if the temperature hasn't increased by WATCH_TEMP_INCREASE degrees, the machine is halted, requiring a
- * hard reset. This test restarts with any M104/M109, but only if the current temperature is below the target
- * by at least 2 * WATCH_TEMP_INCREASE degrees celsius.
+ * Thermal Protection parameters
  */
-#define WATCH_TEMP_PERIOD 16000 // 16 seconds
-#define WATCH_TEMP_INCREASE 4  // Heat up at least 4 degrees in 16 seconds
+#ifdef THERMAL_PROTECTION_HOTENDS
+  #define THERMAL_PROTECTION_PERIOD 40        // Seconds
+  #define THERMAL_PROTECTION_HYSTERESIS 4     // Degrees Celsius
 
+  /**
+   * Whenever an M104 or M109 increases the target temperature the firmware will wait for the
+   * WATCH_TEMP_PERIOD to transpire, and if the temperature hasn't increased by WATCH_TEMP_INCREASE
+   * degrees, the machine is halted, requiring a hard reset. This test restarts with any M104/M109,
+   * but only if the current temperature is below the target by at least 2 * WATCH_TEMP_INCREASE degrees.
+   */
+  #define WATCH_TEMP_PERIOD 16                        // Seconds
+  #define WATCH_TEMP_INCREASE 4                       // Degrees Celsius
+#endif
+
+#ifdef THERMAL_PROTECTION_BED
+  #define THERMAL_PROTECTION_BED_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_BED_HYSTERESIS 2 // Degrees Celsius
+#endif
+
+/**
+ * Automatic Temperature:
+ * The hotend target temperature is calculated by all the buffered lines of gcode.
+ * The maximum buffered steps/sec of the extruder motor is called "se".
+ * Start autotemp mode with M109 S<mintemp> B<maxtemp> F<factor>
+ * The target temperature is set to mintemp+factor*se[steps/sec] and is limited by
+ * mintemp and maxtemp. Turn this off by excuting M109 without F*
+ * Also, if the temperature is set to a value below mintemp, it will not be changed by autotemp.
+ * On an Ultimaker, some initial testing worked with M109 S215 B260 F1 in the start.gcode
+ */
 #ifdef PIDTEMP
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.