Split the configuration file in two parts.

One for common settings.
One for advanced settings.

Marlin/Configuration.h

@@ -1,26 +1,13 @@
 #ifndef __CONFIGURATION_H
 #define __CONFIGURATION_H
 
-
+// This configurtion file contains the basic settings.
+// Advanced settings can be found in Configuration_adv.h 
+// BASIC SETTINGS: select your board type, temperature sensor type, axis scaling, and endstop configuration
 
 // This determines the communication speed of the printer
 #define BAUDRATE 250000
 //#define BAUDRATE 115200
-//#define BAUDRATE 230400
-
-#define EXTRUDERS 1
-
-// Frequency limit
-// See nophead's blog for more info
-// Not working O
-//#define XY_FREQUENCY_LIMIT  15
-
-// Minimum planner junction speed. Sets the default minimum speed the planner plans for at the end
-// of the buffer and all stops. This should not be much greater than zero and should only be changed
-// if unwanted behavior is observed on a user's machine when running at very slow speeds.
-#define MINIMUM_PLANNER_SPEED 2.0 // (mm/sec)
-
-// BASIC SETTINGS: select your board type, thermistor type, axis scaling, and endstop configuration
 
 //// The following define selects which electronics board you have. Please choose the one that matches your setup
 // MEGA/RAMPS up to 1.2 = 3,
@@ -36,7 +23,10 @@
 //=============================Thermal Settings  ============================
 //===========================================================================
 
-//// Thermistor settings:
+//// Temperature sensor settings:
+// -2 is thermocouple with MAX6675 (only for sensor 0)
+// -1 is thermocouple with AD595
+// 0 is not used
 // 1 is 100k thermistor
 // 2 is 200k thermistor
 // 3 is mendel-parts thermistor
@@ -45,70 +35,33 @@
 // 6 is EPCOS 100k
 // 7 is 100k Honeywell thermistor 135-104LAG-J01
 
-//#define THERMISTORHEATER_0 3
-//#define THERMISTORHEATER_1 1
-//#define THERMISTORHEATER_2 1
-
-//#define HEATER_0_USES_THERMISTOR
-//#define HEATER_1_USES_THERMISTOR
-//#define HEATER_2_USES_THERMISTOR
-#define HEATER_0_USES_AD595
-//#define HEATER_1_USES_AD595
-//#define HEATER_2_USES_AD595
-//#define HEATER_0_USES_MAX6675
- 
-
-// Select one of these only to define how the bed temp is read.
-//#define THERMISTORBED 1
-//#define BED_USES_THERMISTOR
-//#define BED_LIMIT_SWITCHING
-#ifdef BED_LIMIT_SWITCHING
-  #define BED_HYSTERESIS 2 //only disable heating if T>target+BED_HYSTERESIS and enable heating if T>target-BED_HYSTERESIS
-#endif
-//#define BED_USES_AD595
-
-#define BED_CHECK_INTERVAL 5000 //ms
-
-//// Heating sanity check:
-// This waits for the watchperiod in milliseconds whenever an M104 or M109 increases the target temperature
-// If the temperature has not increased at the end of that period, the target temperature is set to zero. 
-// It can be reset with another M104/M109
-//#define WATCHPERIOD 20000 //20 seconds
+#define TEMP_SENSOR_0 -1
+#define TEMP_SENSOR_1 0
+#define TEMP_SENSOR_2 0
+#define TEMP_SENSOR_BED 0
 
 // Actual temperature must be close to target for this long before M109 returns success
 #define TEMP_RESIDENCY_TIME 30  // (seconds)
 #define TEMP_HYSTERESIS 3       // (C°) range of +/- temperatures considered "close" to the target one
 
-//// The minimal temperature defines the temperature below which the heater will not be enabled
+// The minimal temperature defines the temperature below which the heater will not be enabled It is used
+// to check that the wiring to the thermistor is not broken. 
+// Otherwise this would lead to the heater being powered on all the time.
 #define HEATER_0_MINTEMP 5
-//#define HEATER_1_MINTEMP 5
-//#define HEATER_2_MINTEMP 5
-//#define BED_MINTEMP 5
-
+#define HEATER_1_MINTEMP 5
+#define HEATER_2_MINTEMP 5
+#define BED_MINTEMP 5
 
 // When temperature exceeds max temp, your heater will be switched off.
 // This feature exists to protect your hotend from overheating accidentally, but *NOT* from thermistor short/failure!
 // You should use MINTEMP for thermistor short/failure protection.
 #define HEATER_0_MAXTEMP 275
-//#define HEATER_1_MAXTEMP 275
-//#define HEATER_2_MAXTEMP 275
-//#define BED_MAXTEMP 150
-
-
-// Wait for Cooldown
-// This defines if the M109 call should not block if it is cooling down.
-// example: From a current temp of 220, you set M109 S200. 
-// if CooldownNoWait is defined M109 will not wait for the cooldown to finish
-#define CooldownNoWait true
-
-// Heating is finished if a temperature close to this degree shift is reached
-#define HEATING_EARLY_FINISH_DEG_OFFSET 1 //Degree
-
-//Do not wait for M109 to finish when printing from SD card
-//#define STOP_HEATING_WAIT_WHEN_SD_PRINTING
+#define HEATER_1_MAXTEMP 275
+#define HEATER_2_MAXTEMP 275
+#define BED_MAXTEMP 150
 
 // PID settings:
-// Uncomment the following line to enable PID support.
+// Comment the following line to disable PID and enable bang-bang.
 #define PIDTEMP
 #define PID_MAX 255 // limits current to nozzle; 255=full current
 #ifdef PIDTEMP
@@ -118,28 +71,8 @@
   #define K1 0.95 //smoothing factor withing the PID
   #define PID_dT 0.128 //sampling period of the PID
 
-  //To develop some PID settings for your machine, you can initiall follow 
-  // the Ziegler-Nichols method.
-  // set Ki and Kd to zero. 
-  // heat with a defined Kp and see if the temperature stabilizes
-  // ideally you do this graphically with repg.
-  // the PID_CRITIAL_GAIN should be the Kp at which temperature oscillatins are not dampned out/decreas in amplitutde
-  // PID_SWING_AT_CRITIAL is the time for a full period of the oscillations at the critical Gain
-  // usually further manual tunine is necessary.
-
-  #define PID_CRITIAL_GAIN 50
-  #define PID_SWING_AT_CRITIAL 47 //seconds
-  
-  //#define PID_PI    //no differentail term
-  #define PID_PID //normal PID
-
-  #ifdef PID_PID
-    //PID according to Ziegler-Nichols method
-//    #define  DEFAULT_Kp  (0.6*PID_CRITIAL_GAIN)
-//    #define  DEFAULT_Ki (2*Kp/PID_SWING_AT_CRITIAL*PID_dT)  
-//    #define  DEFAULT_Kd (PID_SWING_AT_CRITIAL/8./PID_dT)  
-
-// Ultitmaker
+// If you are using a preconfigured hotend then you can use one of the value sets by uncommenting it
+// Ultimaker
     #define  DEFAULT_Kp  22.2
     #define  DEFAULT_Ki (1.25*PID_dT)  
     #define  DEFAULT_Kd (99/PID_dT)  
@@ -152,39 +85,19 @@
 // Mendel Parts V9 on 12V    
 //    #define  DEFAULT_Kp  63.0
 //    #define  DEFAULT_Ki (2.25*PID_dT)  
-//    #define  DEFAULT_Kd (440/PID_dT)  
-  #endif
-   
-  #ifdef PID_PI
-    //PI according to Ziegler-Nichols method
-    #define  DEFAULT_Kp (PID_CRITIAL_GAIN/2.2) 
-    #define  DEFAULT_Ki (1.2*Kp/PID_SWING_AT_CRITIAL*PID_dT)
-    #define  DEFAULT_Kd (0)
-  #endif
-  
-  // this adds an experimental additional term to the heatingpower, proportional to the extrusion speed.
-  // if Kc is choosen well, the additional required power due to increased melting should be compensated.
-  #define PID_ADD_EXTRUSION_RATE  
-  #ifdef PID_ADD_EXTRUSION_RATE
-    #define  DEFAULT_Kc (1) //heatingpower=Kc*(e_speed)
-  #endif
+//    #define  DEFAULT_Kd (440/PID_dT)
 #endif // PIDTEMP
 
-//  extruder run-out prevention. 
-//if the machine is idle, and the temperature over MINTEMP, every couple of SECONDS some filament is extruded
-//#define EXTRUDER_RUNOUT_PREVENT  
-#define EXTRUDER_RUNOUT_MINTEMP 190  
-#define EXTRUDER_RUNOUT_SECONDS 30.
-#define EXTRUDER_RUNOUT_ESTEPS 14. //mm filament
-#define EXTRUDER_RUNOUT_SPEED 1500.  //extrusion speed
-#define EXTRUDER_RUNOUT_EXTRUDE 100
-
+//this prevents dangerous Extruder moves, i.e. if the temperature is under the limit
+//can be software-disabled for whatever purposes by
+#define PREVENT_DANGEROUS_EXTRUDE
+#define EXTRUDE_MINTEMP 190
+#define EXTRUDE_MAXLENGTH (X_MAX_LENGTH+Y_MAX_LENGTH) //prevent extrusion of very large distances.
 
 //===========================================================================
 //=============================Mechanical Settings===========================
 //===========================================================================
 
-
 // Endstop Settings
 #define ENDSTOPPULLUPS // Comment this out (using // at the start of the line) to disable the endstop pullup resistors
 
@@ -192,9 +105,6 @@
 const bool X_ENDSTOPS_INVERTING = true; // set to true to invert the logic of the endstops. 
 const bool Y_ENDSTOPS_INVERTING = true; // set to true to invert the logic of the endstops. 
 const bool Z_ENDSTOPS_INVERTING = true; // set to true to invert the logic of the endstops. 
-// For optos H21LOB set to true, for Mendel-Parts newer optos TCST2103 set to false
-
-#define ENDSTOPS_ONLY_FOR_HOMING // If defined the endstops will only be used for homing
 
 // For Inverting Stepper Enable Pins (Active Low) use 0, Non Inverting (Active High) use 1
 #define X_ENABLE_ON 0
@@ -207,13 +117,6 @@ const bool Z_ENDSTOPS_INVERTING = true; // set to true to invert the logic of th
 #define DISABLE_Y false
 #define DISABLE_Z false
 #define DISABLE_E false // For all extruders
-//#define Z_LATE_ENABLE // Enable Z the last moment. Needed if your Z driver overheats.
-
-// Inverting axis direction
-//#define INVERT_X_DIR false    // for Mendel set to false, for Orca set to true
-//#define INVERT_Y_DIR true   // for Mendel set to true, for Orca set to false
-//#define INVERT_Z_DIR false    // for Mendel set to false, for Orca set to true
-//#define INVERT_E*_DIR true   // for direct drive extruder v9 set to true, for geared extruder set to false, used for all extruders
 
 #define INVERT_X_DIR true    // for Mendel set to false, for Orca set to true
 #define INVERT_Y_DIR false    // for Mendel set to true, for Orca set to false
@@ -222,7 +125,7 @@ const bool Z_ENDSTOPS_INVERTING = true; // set to true to invert the logic of th
 #define INVERT_E1_DIR false    // for direct drive extruder v9 set to true, for geared extruder set to false
 #define INVERT_E2_DIR false   // for direct drive extruder v9 set to true, for geared extruder set to false
 
-//// ENDSTOP SETTINGS:
+// ENDSTOP SETTINGS:
 // Sets direction of endstops when homing; 1=MAX, -1=MIN
 #define X_HOME_DIR -1
 #define Y_HOME_DIR -1
@@ -238,43 +141,19 @@ const bool Z_ENDSTOPS_INVERTING = true; // set to true to invert the logic of th
 #define NUM_AXIS 4 // The axis order in all axis related arrays is X, Y, Z, E
 #define HOMING_FEEDRATE {50*60, 50*60, 4*60, 0}  // set the homing speeds (mm/min)
 
-//homing hits the endstop, then retracts by this distance, before it tries to slowly bump again:
-#define X_HOME_RETRACT_MM 5 
-#define Y_HOME_RETRACT_MM 5 
-#define Z_HOME_RETRACT_MM 1 
-#define QUICK_HOME  //if this is defined, if both x and y are to be homed, a diagonal move will be performed initially.
-
-#define AXIS_RELATIVE_MODES {false, false, false, false}
-
-#define MAX_STEP_FREQUENCY 40000 // Max step frequency for Ultimaker (5000 pps / half step)
-
 // default settings 
 
 #define DEFAULT_AXIS_STEPS_PER_UNIT   {78.7402,78.7402,200*8/3,760*1.1}                    // default steps per unit for ultimaker 
-//#define DEFAULT_AXIS_STEPS_PER_UNIT   {40, 40, 3333.92, 360} //sells mendel with v9 extruder
-//#define DEFAULT_AXIS_STEPS_PER_UNIT   {80.3232, 80.8900, 2284.7651, 757.2218} // SAE Prusa w/ Wade extruder
 #define DEFAULT_MAX_FEEDRATE          {500, 500, 5, 45}    // (mm/sec)    
 #define DEFAULT_MAX_ACCELERATION      {9000,9000,100,10000}    // X, Y, Z, E maximum start speed for accelerated moves. E default values are good for skeinforge 40+, for older versions raise them a lot.
 
 #define DEFAULT_ACCELERATION          3000    // X, Y, Z and E max acceleration in mm/s^2 for printing moves 
 #define DEFAULT_RETRACT_ACCELERATION  3000   // X, Y, Z and E max acceleration in mm/s^2 for r retracts
 
-#define DEFAULT_MINIMUMFEEDRATE       0.0     // minimum feedrate
-#define DEFAULT_MINTRAVELFEEDRATE     0.0
-
-// minimum time in microseconds that a movement needs to take if the buffer is emptied.   Increase this number if you see blobs while printing high speed & high detail.  It will slowdown on the detailed stuff.
-#define DEFAULT_MINSEGMENTTIME        20000   // Obsolete delete this
+// 
 #define DEFAULT_XYJERK                20.0    // (mm/sec)
 #define DEFAULT_ZJERK                 0.4     // (mm/sec)
 
-// If defined the movements slow down when the look ahead buffer is only half full
-#define SLOWDOWN
-
-//default stepper release if idle
-#define DEFAULT_STEPPER_DEACTIVE_TIME 60
-#define DEFAULT_STEPPER_DEACTIVE_COMMAND "M84 X Y E"  //z stays  powered
-
-
 //===========================================================================
 //=============================Additional Features===========================
 //===========================================================================
@@ -285,47 +164,14 @@ const bool Z_ENDSTOPS_INVERTING = true; // set to true to invert the logic of th
 // M501 - reads parameters from EEPROM (if you need reset them after you changed them temporarily).  
 // M502 - reverts to the default "factory settings".  You still need to store them in EEPROM afterwards if you want to.
 //define this to enable eeprom support
-#define EEPROM_SETTINGS
+//#define EEPROM_SETTINGS
 //to disable EEPROM Serial responses and decrease program space by ~1700 byte: comment this out:
 // please keep turned on if you can.
-#define EEPROM_CHITCHAT
-
-
-// The hardware watchdog should halt the Microcontroller, in case the firmware gets stuck somewhere. However:
-// the Watchdog is not working well, so please only enable this for testing
-// this enables the watchdog interrupt.
-//#define USE_WATCHDOG
-//#ifdef USE_WATCHDOG
-  // you cannot reboot on a mega2560 due to a bug in he bootloader. Hence, you have to reset manually, and this is done hereby:
-//#define RESET_MANUAL
-//#define WATCHDOG_TIMEOUT 4  //seconds
-//#endif
-
-// extruder advance constant (s2/mm3)
-//
-// advance (steps) = STEPS_PER_CUBIC_MM_E * EXTUDER_ADVANCE_K * cubic mm per second ^ 2
-//
-// hooke's law says:		force = k * distance
-// bernoulli's priniciple says:	v ^ 2 / 2 + g . h + pressure / density = constant
-// so: v ^ 2 is proportional to number of steps we advance the extruder
-//#define ADVANCE
-
-#ifdef ADVANCE
-  #define EXTRUDER_ADVANCE_K .0
-
-  #define D_FILAMENT 2.85
-  #define STEPS_MM_E 836
-  #define EXTRUTION_AREA (0.25 * D_FILAMENT * D_FILAMENT * 3.14159)
-  #define STEPS_PER_CUBIC_MM_E (axis_steps_per_unit[E_AXIS]/ EXTRUTION_AREA)
-
-#endif // ADVANCE
-
+//#define EEPROM_CHITCHAT
 
 //LCD and SD support
 //#define ULTRA_LCD  //general lcd support, also 16x2
 //#define SDSUPPORT // Enable SD Card Support in Hardware Console
-#define SD_FINISHED_STEPPERRELEASE true  //if sd support and the file is finished: disable steppers?
-#define SD_FINISHED_RELEASECOMMAND "M84 X Y E" // no z because of layer shift.
 
 //#define ULTIPANEL
 #ifdef ULTIPANEL
@@ -341,60 +187,11 @@ const bool Z_ENDSTOPS_INVERTING = true; // set to true to invert the logic of th
   #endif
 #endif
 
-// A debugging feature to compare calculated vs performed steps, to see if steps are lost by the software.
-//#define DEBUG_STEPS
-
-
-// Arc interpretation settings:
-#define MM_PER_ARC_SEGMENT 1
-#define N_ARC_CORRECTION 25
-
-
-//automatic temperature: The hot end target temperature is calculated by all the buffered lines of gcode.
-//The maximum buffered steps/sec of the extruder motor are called "se".
-//You enter the autotemp mode by a M109 S<mintemp> T<maxtemp> F<factor>
-// the target temperature is set to mintemp+factor*se[steps/sec] and limited by mintemp and maxtemp
-// you exit the value by any M109 without F*
-// Also, if the temperature is set to a value <mintemp, it is not changed by autotemp.
-// on an ultimaker, some initial testing worked with M109 S215 T260 F0.1 in the start.gcode
-//#define AUTOTEMP
-#ifdef AUTOTEMP
-  #define AUTOTEMP_OLDWEIGHT 0.98
-#endif
-
-//this prevents dangerous Extruder moves, i.e. if the temperature is under the limit
-//can be software-disabled for whatever purposes by
-#define PREVENT_DANGEROUS_EXTRUDE
-#define EXTRUDE_MINTEMP 190
-#define EXTRUDE_MAXLENGTH (X_MAX_LENGTH+Y_MAX_LENGTH) //prevent extrusion of very large distances.
-
-const int dropsegments=5; //everything with less than this number of steps will be ignored as move and joined with the next movement
-
-
 // M240  Triggers a camera by emulating a Canon RC-1 Remote
 // Data from: http://www.doc-diy.net/photo/rc-1_hacked/
 // #define PHOTOGRAPH_PIN     23
 
-//===========================================================================
-//=============================Buffers           ============================
-//===========================================================================
-
-
-
-// The number of linear motions that can be in the plan at any give time.  
-// THE BLOCK_BUFFER_SIZE NEEDS TO BE A POWER OF 2, i.g. 8,16,32 because shifts and ors are used to do the ringbuffering.
-#if defined SDSUPPORT
-  #define BLOCK_BUFFER_SIZE 16   // SD,LCD,Buttons take more memory, block buffer needs to be smaller
-#else
-  #define BLOCK_BUFFER_SIZE 16 // maximize block buffer
-#endif
-
-
-//The ASCII buffer for recieving from the serial:
-#define MAX_CMD_SIZE 96
-#define BUFSIZE 4
-
-
+#include "Configuration_adv.h"
 #include "thermistortables.h"
 
 #endif //__CONFIGURATION_H

Marlin/Configuration_adv.h

@@ -0,0 +1,208 @@
+#ifndef __CONFIGURATION_ADV_H
+#define __CONFIGURATION_ADV_H
+
+//===========================================================================
+//=============================Thermal Settings  ============================
+//===========================================================================
+
+// Select one of these only to define how the bed temp is read.
+//
+//#define BED_LIMIT_SWITCHING
+#ifdef BED_LIMIT_SWITCHING
+  #define BED_HYSTERESIS 2 //only disable heating if T>target+BED_HYSTERESIS and enable heating if T>target-BED_HYSTERESIS
+#endif
+#define BED_CHECK_INTERVAL 5000 //ms
+
+//// Heating sanity check:
+// This waits for the watchperiod in milliseconds whenever an M104 or M109 increases the target temperature
+// If the temperature has not increased at the end of that period, the target temperature is set to zero. 
+// It can be reset with another M104/M109
+//#define WATCHPERIOD 20000 //20 seconds
+
+// Wait for Cooldown
+// This defines if the M109 call should not block if it is cooling down.
+// example: From a current temp of 220, you set M109 S200. 
+// if CooldownNoWait is defined M109 will not wait for the cooldown to finish
+#define CooldownNoWait true
+
+// Heating is finished if a temperature close to this degree shift is reached
+#define HEATING_EARLY_FINISH_DEG_OFFSET 1 //Degree
+
+//Do not wait for M109 to finish when printing from SD card
+//#define STOP_HEATING_WAIT_WHEN_SD_PRINTING
+
+#ifdef PIDTEMP
+  // this adds an experimental additional term to the heatingpower, proportional to the extrusion speed.
+  // if Kc is choosen well, the additional required power due to increased melting should be compensated.
+  #define PID_ADD_EXTRUSION_RATE  
+  #ifdef PID_ADD_EXTRUSION_RATE
+    #define  DEFAULT_Kc (1) //heatingpower=Kc*(e_speed)
+  #endif
+#endif
+
+
+//automatic temperature: The hot end target temperature is calculated by all the buffered lines of gcode.
+//The maximum buffered steps/sec of the extruder motor are called "se".
+//You enter the autotemp mode by a M109 S<mintemp> T<maxtemp> F<factor>
+// the target temperature is set to mintemp+factor*se[steps/sec] and limited by mintemp and maxtemp
+// you exit the value by any M109 without F*
+// Also, if the temperature is set to a value <mintemp, it is not changed by autotemp.
+// on an ultimaker, some initial testing worked with M109 S215 T260 F0.1 in the start.gcode
+//#define AUTOTEMP
+#ifdef AUTOTEMP
+  #define AUTOTEMP_OLDWEIGHT 0.98
+#endif
+
+//  extruder run-out prevention. 
+//if the machine is idle, and the temperature over MINTEMP, every couple of SECONDS some filament is extruded
+//#define EXTRUDER_RUNOUT_PREVENT  
+#define EXTRUDER_RUNOUT_MINTEMP 190  
+#define EXTRUDER_RUNOUT_SECONDS 30.
+#define EXTRUDER_RUNOUT_ESTEPS 14. //mm filament
+#define EXTRUDER_RUNOUT_SPEED 1500.  //extrusion speed
+#define EXTRUDER_RUNOUT_EXTRUDE 100
+
+//===========================================================================
+//=============================Mechanical Settings===========================
+//===========================================================================
+
+// This defines the number of extruders
+#define EXTRUDERS 1
+
+#define ENDSTOPS_ONLY_FOR_HOMING // If defined the endstops will only be used for homing
+
+//#define Z_LATE_ENABLE // Enable Z the last moment. Needed if your Z driver overheats.
+
+//homing hits the endstop, then retracts by this distance, before it tries to slowly bump again:
+#define X_HOME_RETRACT_MM 5 
+#define Y_HOME_RETRACT_MM 5 
+#define Z_HOME_RETRACT_MM 1 
+#define QUICK_HOME  //if this is defined, if both x and y are to be homed, a diagonal move will be performed initially.
+
+#define AXIS_RELATIVE_MODES {false, false, false, false}
+
+#define MAX_STEP_FREQUENCY 40000 // Max step frequency for Ultimaker (5000 pps / half step)
+
+//default stepper release if idle
+#define DEFAULT_STEPPER_DEACTIVE_TIME 60
+#define DEFAULT_STEPPER_DEACTIVE_COMMAND "M84 X Y E"  //z stays  powered
+
+#define DEFAULT_MINIMUMFEEDRATE       0.0     // minimum feedrate
+#define DEFAULT_MINTRAVELFEEDRATE     0.0
+
+// minimum time in microseconds that a movement needs to take if the buffer is emptied.   Increase this number if you see blobs while printing high speed & high detail.  It will slowdown on the detailed stuff.
+#define DEFAULT_MINSEGMENTTIME        20000   // Obsolete delete this
+
+// If defined the movements slow down when the look ahead buffer is only half full
+#define SLOWDOWN
+
+// Frequency limit
+// See nophead's blog for more info
+// Not working O
+//#define XY_FREQUENCY_LIMIT  15
+
+// Minimum planner junction speed. Sets the default minimum speed the planner plans for at the end
+// of the buffer and all stops. This should not be much greater than zero and should only be changed
+// if unwanted behavior is observed on a user's machine when running at very slow speeds.
+#define MINIMUM_PLANNER_SPEED 2.0 // (mm/sec)
+
+//===========================================================================
+//=============================Additional Features===========================
+//===========================================================================
+
+
+#define SD_FINISHED_STEPPERRELEASE true  //if sd support and the file is finished: disable steppers?
+#define SD_FINISHED_RELEASECOMMAND "M84 X Y E" // no z because of layer shift.
+
+// The hardware watchdog should halt the Microcontroller, in case the firmware gets stuck somewhere. However:
+// the Watchdog is not working well, so please only enable this for testing
+// this enables the watchdog interrupt.
+//#define USE_WATCHDOG
+//#ifdef USE_WATCHDOG
+  // you cannot reboot on a mega2560 due to a bug in he bootloader. Hence, you have to reset manually, and this is done hereby:
+//#define RESET_MANUAL
+//#define WATCHDOG_TIMEOUT 4  //seconds
+//#endif
+
+// extruder advance constant (s2/mm3)
+//
+// advance (steps) = STEPS_PER_CUBIC_MM_E * EXTUDER_ADVANCE_K * cubic mm per second ^ 2
+//
+// hooke's law says:		force = k * distance
+// bernoulli's priniciple says:	v ^ 2 / 2 + g . h + pressure / density = constant
+// so: v ^ 2 is proportional to number of steps we advance the extruder
+//#define ADVANCE
+
+#ifdef ADVANCE
+  #define EXTRUDER_ADVANCE_K .0
+
+  #define D_FILAMENT 2.85
+  #define STEPS_MM_E 836
+  #define EXTRUTION_AREA (0.25 * D_FILAMENT * D_FILAMENT * 3.14159)
+  #define STEPS_PER_CUBIC_MM_E (axis_steps_per_unit[E_AXIS]/ EXTRUTION_AREA)
+
+#endif // ADVANCE
+
+// A debugging feature to compare calculated vs performed steps, to see if steps are lost by the software.
+//#define DEBUG_STEPS
+
+// Arc interpretation settings:
+#define MM_PER_ARC_SEGMENT 1
+#define N_ARC_CORRECTION 25
+
+const int dropsegments=5; //everything with less than this number of steps will be ignored as move and joined with the next movement
+
+//===========================================================================
+//=============================Buffers           ============================
+//===========================================================================
+
+// The number of linear motions that can be in the plan at any give time.  
+// THE BLOCK_BUFFER_SIZE NEEDS TO BE A POWER OF 2, i.g. 8,16,32 because shifts and ors are used to do the ringbuffering.
+#if defined SDSUPPORT
+  #define BLOCK_BUFFER_SIZE 16   // SD,LCD,Buttons take more memory, block buffer needs to be smaller
+#else
+  #define BLOCK_BUFFER_SIZE 16 // maximize block buffer
+#endif
+
+
+//The ASCII buffer for recieving from the serial:
+#define MAX_CMD_SIZE 96
+#define BUFSIZE 4
+
+//===========================================================================
+//=============================  Define Defines  ============================
+//===========================================================================
+
+#if TEMP_SENSOR_0 > 0
+  #define THERMISTORHEATER_0 TEMP_SENSOR_0
+  #define HEATER_0_USES_THERMISTOR
+#endif
+#if TEMP_SENSOR_1 > 0
+  #define THERMISTORHEATER_1 TEMP_SENSOR_1
+  #define HEATER_1_USES_THERMISTOR
+#endif
+#if TEMP_SENSOR_2 > 0
+  #define THERMISTORHEATER_2 TEMP_SENSOR_2
+  #define HEATER_2_USES_THERMISTOR
+#endif
+#if TEMP_SENSOR_BED > 0
+  #define THERMISTORBED TEMP_SENSOR_BED
+  #define BED_USES_THERMISTOR
+#endif
+#if TEMP_SENSOR_0 == -1
+  #define HEATER_0_USES_AD595
+#endif
+#if TEMP_SENSOR_1 == -1
+  #define HEATER_1_USES_AD595
+#endif
+#if TEMP_SENSOR_2 == -1
+  #define HEATER_2_USES_AD595
+#endif
+#if TEMP_SENSOR_BED == -1
+  #define BED_USES_AD595
+#endif
+#if TEMP_SENSOR_0 == -2
+  #define HEATER_0_USES_MAX6675
+#endif
+
+#endif //__CONFIGURATION_ADV_H

Marlin/Marlin.pde

@@ -254,6 +254,12 @@ void suicide()
   #endif
 }
 
+long millis_diff(unsigned long starttime) {
+  unsigned long difftime = millis() - starttime;
+  if (difftime > 0x8000) difftime += 0x8000;
+  return difftime;
+}
+
 void setup()
 { 
   setup_powerhold();
@@ -550,9 +556,9 @@ void process_commands()
       if(code_seen('S')) codenum = code_value() * 1000; // seconds to wait
       
       st_synchronize();
-      codenum += millis();  // keep track of when we started waiting
+//      codenum += millis();  // keep track of when we started waiting
       previous_millis_cmd = millis();
-      while(millis()  < codenum ){
+      while(millis_diff(previous_millis_cmd)  < codenum ){
         manage_heater();
       }
       break;
@@ -843,11 +849,11 @@ void process_commands()
         /* continue to loop until we have reached the target temp   
           _and_ until TEMP_RESIDENCY_TIME hasn't passed since we reached it */
         while((residencyStart == -1) ||
-              (residencyStart > -1 && (millis() - residencyStart) < TEMP_RESIDENCY_TIME*1000) ) {
+              (residencyStart > -1 && (millis_diff(residencyStart) < TEMP_RESIDENCY_TIME*1000) )) {
       #else
         while ( target_direction ? (isHeatingHotend(tmp_extruder)) : (isCoolingHotend(tmp_extruder)&&(CooldownNoWait==false)) ) {
       #endif //TEMP_RESIDENCY_TIME
-          if( (millis() - codenum) > 1000 ) 
+          if(millis_diff(codenum) > 1000 ) 
           { //Print Temp Reading and remaining time every 1 second while heating up/cooling down
             SERIAL_PROTOCOLPGM("T:");
             SERIAL_PROTOCOL( degHotend(tmp_extruder) ); 
@@ -857,7 +863,7 @@ void process_commands()
               SERIAL_PROTOCOLPGM(" W:");
               if(residencyStart > -1)
               {
-                 codenum = TEMP_RESIDENCY_TIME - ((millis() - residencyStart) / 1000);
+                 codenum = TEMP_RESIDENCY_TIME - (millis_diff(residencyStart) / 1000);
                  SERIAL_PROTOCOLLN( codenum );
               }
               else 
@@ -895,7 +901,7 @@ void process_commands()
         codenum = millis(); 
         while(isHeatingBed()) 
         {
-          if( (millis()-codenum) > 1000 ) //Print Temp Reading every 1 second while heating up.
+          if( millis_diff(codenum) > 1000 ) //Print Temp Reading every 1 second while heating up.
           {
             float tt=degHotend(active_extruder);
             SERIAL_PROTOCOLPGM("T:");
@@ -1293,11 +1299,11 @@ void prepare_arc_move(char isclockwise) {
 
 void manage_inactivity(byte debug) 
 { 
-  if( (millis()-previous_millis_cmd) >  max_inactive_time ) 
+  if( millis_diff(previous_millis_cmd) >  max_inactive_time ) 
     if(max_inactive_time) 
       kill(); 
   if(stepper_inactive_time)  
-  if( (millis()-last_stepperdisabled_time) >  stepper_inactive_time ) 
+  if( millis_diff(last_stepperdisabled_time) >  stepper_inactive_time ) 
   {
     if(previous_millis_cmd>last_stepperdisabled_time)
       last_stepperdisabled_time=previous_millis_cmd;
@@ -1309,7 +1315,7 @@ void manage_inactivity(byte debug)
     }
   }
   #ifdef EXTRUDER_RUNOUT_PREVENT
-    if( (millis()-previous_millis_cmd) >  EXTRUDER_RUNOUT_SECONDS*1000 ) 
+    if( millis_diff(previous_millis_cmd) >  EXTRUDER_RUNOUT_SECONDS*1000 ) 
     if(degHotend(active_extruder)>EXTRUDER_RUNOUT_MINTEMP)
     {
      bool oldstatus=READ(E0_ENABLE_PIN);