Cleaning up code in prep for merge with upstream.

Marlin/Configuration.h

 const bool Y_MAX_ENDSTOP_INVERTING = false; // set to true to invert the logic of the endstop.
 const bool Z_MAX_ENDSTOP_INVERTING = false; // set to true to invert the logic of the endstop.
 const bool Z_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the logic of the endstop.
-
 //#define DISABLE_MAX_ENDSTOPS
 //#define DISABLE_MIN_ENDSTOPS
 // If you want to enable the Z Probe pin, but disable its use, uncomment the line below.

Marlin/Marlin.h

 extern float homing_feedrate[];
 extern bool axis_relative_modes[];
 extern int feedmultiply;
-extern int extrudemultiply; // Sets extrude multiply factor (in percent) for all extruders
 extern bool volumetric_enabled;
 extern int extruder_multiply[EXTRUDERS]; // sets extrude multiply factor (in percent) for each extruder individually
 extern float filament_size[EXTRUDERS]; // cross-sectional area of filament (in millimeters), typically around 1.75 or 2.85, 0 disables the volumetric calculations for the extruder.

Marlin/Marlin_main.cpp

 // M404 - N<dia in mm> Enter the nominal filament width (3mm, 1.75mm ) or will display nominal filament width without parameters
 // M405 - Turn on Filament Sensor extrusion control.  Optional D<delay in cm> to set delay in centimeters between sensor and extruder
 // M406 - Turn off Filament Sensor extrusion control
-// M407 - Displays measured filament diameter
+// M407 - Display measured filament diameter
 // M500 - Store parameters in EEPROM
 // M501 - Read parameters from EEPROM (if you need reset them after you changed them temporarily).
-// M502 - Revert to the default "factory settings".  You still need to store them in EEPROM afterwards if you want to.
+// M502 - Revert to the default "factory settings". You still need to store them in EEPROM afterwards if you want to.
 // M503 - Print the current settings (from memory not from EEPROM). Use S0 to leave off headings.
 // M540 - Use S[0|1] to enable or disable the stop SD card print on endstop hit (requires ABORT_ON_ENDSTOP_HIT_FEATURE_ENABLED)
 // M600 - Pause for filament change X[pos] Y[pos] Z[relative lift] E[initial retract] L[later retract distance for removal]
 
 #endif // FWRETRACT
 
-#ifdef ULTIPANEL
+#if defined(ULTIPANEL) && HAS_POWER_SWITCH
   bool powersupply = 
     #ifdef PS_DEFAULT_OFF
       false
 
 #ifdef FILAMENT_SENSOR
   //Variables for Filament Sensor input
-  float filament_width_nominal=DEFAULT_NOMINAL_FILAMENT_DIA;  //Set nominal filament width, can be changed with M404
-  bool filament_sensor=false;  //M405 turns on filament_sensor control, M406 turns it off
-  float filament_width_meas=DEFAULT_MEASURED_FILAMENT_DIA; //Stores the measured filament diameter
+  float filament_width_nominal = DEFAULT_NOMINAL_FILAMENT_DIA;  //Set nominal filament width, can be changed with M404
+  bool filament_sensor = false;  //M405 turns on filament_sensor control, M406 turns it off
+  float filament_width_meas = DEFAULT_MEASURED_FILAMENT_DIA; //Stores the measured filament diameter
   signed char measurement_delay[MAX_MEASUREMENT_DELAY+1];  //ring buffer to delay measurement  store extruder factor after subtracting 100
-  int delay_index1=0;  //index into ring buffer
-  int delay_index2=-1;  //index into ring buffer - set to -1 on startup to indicate ring buffer needs to be initialized
-  float delay_dist=0; //delay distance counter
+  int delay_index1 = 0;  //index into ring buffer
+  int delay_index2 = -1;  //index into ring buffer - set to -1 on startup to indicate ring buffer needs to be initialized
+  float delay_dist = 0; //delay distance counter
   int meas_delay_cm = MEASUREMENT_DELAY_CM;  //distance delay setting
 #endif
 
   #if defined(SUICIDE_PIN) && SUICIDE_PIN > -1
     OUT_WRITE(SUICIDE_PIN, HIGH);
   #endif
-  #if defined(PS_ON_PIN) && PS_ON_PIN > -1
-    #if defined(PS_DEFAULT_OFF)
+  #if HAS_POWER_SWITCH
+    #ifdef PS_DEFAULT_OFF
       OUT_WRITE(PS_ON_PIN, PS_ON_ASLEEP);
     #else
       OUT_WRITE(PS_ON_PIN, PS_ON_AWAKE);
   static void run_z_probe() {
 
     #ifdef DELTA
-
+    
       float start_z = current_position[Z_AXIS];
       long start_steps = st_get_position(Z_AXIS);
     
       current_position[Z_AXIS] = st_get_position_mm(Z_AXIS);
       // make sure the planner knows where we are as it may be a bit different than we last said to move to
       sync_plan_position();
-
+      
     #endif // !DELTA
   }
 
     #ifdef DELTA
 
       feedrate = XY_TRAVEL_SPEED;
-
+      
       destination[X_AXIS] = x;
       destination[Y_AXIS] = y;
       destination[Z_AXIS] = z;
       feedrate = homing_feedrate[X_AXIS]/10;
       destination[X_AXIS] = 0;
       prepare_move_raw();
-
+      
       // Home Y for safety
       feedrate = homing_feedrate[X_AXIS]/2;
       destination[Y_AXIS] = 0;
       prepare_move_raw();
-
+      
       st_synchronize();
 
     #if defined(Z_PROBE_ENDSTOP)
       if (z_probe_endstop) {
     #else
       bool z_min_endstop = (READ(Z_MIN_PIN) != Z_MIN_ENDSTOP_INVERTING);
-      if (!z_min_endstop) {
+      if (z_min_endstop) {
     #endif
         if (!Stopped) {
           SERIAL_ERROR_START;
       }
 
     #endif // Z_PROBE_ALLEN_KEY
-      
+
   }
 
   static void retract_z_probe() {
         #if SERVO_LEVELING
           servos[servo_endstops[Z_AXIS]].attach(0);
         #endif
-          
-          servos[servo_endstops[Z_AXIS]].write(servo_endstop_angles[Z_AXIS * 2 + 1]);
-          
+
+        servos[servo_endstops[Z_AXIS]].write(servo_endstop_angles[Z_AXIS * 2 + 1]);
+
         #if SERVO_LEVELING
           delay(PROBE_SERVO_DEACTIVATION_DELAY);
           servos[servo_endstops[Z_AXIS]].detach();
       feedrate = homing_feedrate[Z_AXIS]/10;
       destination[Z_AXIS] = current_position[Z_AXIS] - Z_PROBE_ALLEN_KEY_RETRACT_DEPTH;
       prepare_move_raw();
-
+      
       // Move up for safety
       feedrate = homing_feedrate[Z_AXIS]/2;
       destination[Z_AXIS] = current_position[Z_AXIS] + Z_PROBE_ALLEN_KEY_RETRACT_DEPTH * 2;
       prepare_move_raw();
-
+      
       // Home XY for safety
       feedrate = homing_feedrate[X_AXIS]/2;
       destination[X_AXIS] = 0;
       destination[Y_AXIS] = 0;
       prepare_move_raw();
-
+      
       st_synchronize();
 
     #if defined(Z_PROBE_ENDSTOP)
       bool z_probe_endstop = (READ(Z_PROBE_PIN) != Z_PROBE_ENDSTOP_INVERTING);
-      if (z_probe_endstop) {
+      if (!z_probe_endstop) {
     #else
       bool z_min_endstop = (READ(Z_MIN_PIN) != Z_MIN_ENDSTOP_INVERTING);
       if (!z_min_endstop) {
   if (code_seen('S')) setTargetBed(code_value());
 }
 
-#if defined(PS_ON_PIN) && PS_ON_PIN > -1
+#if HAS_POWER_SWITCH
 
   /**
    * M80: Turn on Power Supply
     #endif
   }
 
-#endif // PS_ON_PIN
+#endif // HAS_POWER_SWITCH
 
 /**
- * M81: Turn off Power Supply
+ * M81: Turn off Power, including Power Supply, if there is one.
+ *
+ *      This code should ALWAYS be available for EMERGENCY SHUTDOWN!
  */
 inline void gcode_M81() {
   disable_heater();
   #if defined(SUICIDE_PIN) && SUICIDE_PIN > -1
     st_synchronize();
     suicide();
-  #elif defined(PS_ON_PIN) && PS_ON_PIN > -1
+  #elif HAS_POWER_SWITCH
     OUT_WRITE(PS_ON_PIN, PS_ON_ASLEEP);
   #endif
   #ifdef ULTIPANEL
-    powersupply = false;
+    #if HAS_POWER_SWITCH
+      powersupply = false;
+    #endif
     LCD_MESSAGEPGM(MACHINE_NAME " " MSG_OFF ".");
     lcd_update();
   #endif
 }
 
+
 /**
  * M82: Set E codes absolute (default)
  */
         #endif //HEATER_2_PIN
       #endif //BARICUDA
 
-      #if defined(PS_ON_PIN) && PS_ON_PIN > -1
+      #if HAS_POWER_SWITCH
 
         case 80: // M80 - Turn on Power Supply
           gcode_M80();
           break;
 
-      #endif // PS_ON_PIN
+      #endif // HAS_POWER_SWITCH
 
-      case 81: // M81 - Turn off Power Supply
+      case 81: // M81 - Turn off Power, including Power Supply, if possible
         gcode_M81();
         break;
 
   disable_e2();
   disable_e3();
 
-#if defined(PS_ON_PIN) && PS_ON_PIN > -1
-  pinMode(PS_ON_PIN,INPUT);
-#endif
+  #if HAS_POWER_SWITCH
+    pinMode(PS_ON_PIN, INPUT);
+  #endif
+
   SERIAL_ERROR_START;
   SERIAL_ERRORLNPGM(MSG_ERR_KILLED);
   LCD_ALERTMESSAGEPGM(MSG_KILLED);
   
   // FMC small patch to update the LCD before ending
   sei();   // enable interrupts
-  for ( int i=5; i--; lcd_update())
-  {
-     delay(200);
-  }
+  for (int i = 5; i--; lcd_update()) delay(200); // Wait a short time
   cli();   // disable interrupts
   suicide();
   while(1) { /* Intentionally left empty */ } // Wait for reset

Marlin/dogm_lcd_implementation.h

       lcd_printPGM(PSTR("dia:"));
       lcd_print(ftostr12ns(filament_width_meas));
       lcd_printPGM(PSTR(" factor:"));
-      lcd_print(itostr3(extrudemultiply));
+      lcd_print(itostr3(volumetric_multiplier[FILAMENT_SENSOR_EXTRUDER_NUM]));
       lcd_print('%');
     }
   #endif

Marlin/planner.cpp

   block->steps[Z_AXIS] = labs(dz);
   block->steps[E_AXIS] = labs(de);
   block->steps[E_AXIS] *= volumetric_multiplier[active_extruder];
-  block->steps[E_AXIS] *= extrudemultiply;
+  block->steps[E_AXIS] *= extruder_multiply[active_extruder];
   block->steps[E_AXIS] /= 100;
   block->step_event_count = max(block->steps[X_AXIS], max(block->steps[Y_AXIS], max(block->steps[Z_AXIS], block->steps[E_AXIS])));
 
     delta_mm[Y_AXIS] = dy / axis_steps_per_unit[Y_AXIS];
   #endif
   delta_mm[Z_AXIS] = dz / axis_steps_per_unit[Z_AXIS];
-  delta_mm[E_AXIS] = (de / axis_steps_per_unit[E_AXIS]) * volumetric_multiplier[active_extruder] * extrudemultiply / 100.0;
+  delta_mm[E_AXIS] = (de / axis_steps_per_unit[E_AXIS]) * volumetric_multiplier[active_extruder] * extruder_multiply[active_extruder] / 100.0;
 
   if (block->steps[X_AXIS] <= dropsegments && block->steps[Y_AXIS] <= dropsegments && block->steps[Z_AXIS] <= dropsegments) {
     block->millimeters = fabs(delta_mm[E_AXIS]);

Marlin/stepper.cpp

     }
 
     if (TEST(out_bits, Z_AXIS)) {   // -direction
+
       Z_APPLY_DIR(INVERT_Z_DIR,0);
       count_direction[Z_AXIS] = -1;
-      if (check_endstops) 
-      {
-        #if defined(Z_MIN_PIN) && Z_MIN_PIN > -1
-          #ifndef Z_DUAL_ENDSTOPS
-            UPDATE_ENDSTOP(z, Z, min, MIN);
-          #else
-            bool z_min_endstop=(READ(Z_MIN_PIN) != Z_MIN_ENDSTOP_INVERTING);
-            #if defined(Z2_MIN_PIN) && Z2_MIN_PIN > -1
-              bool z2_min_endstop=(READ(Z2_MIN_PIN) != Z2_MIN_ENDSTOP_INVERTING);
-            #else
-              bool z2_min_endstop=z_min_endstop;
-            #endif
-            if(((z_min_endstop && old_z_min_endstop) || (z2_min_endstop && old_z2_min_endstop)) && (current_block->steps[Z_AXIS] > 0))
-            {
+
+      if (check_endstops) {
+
+        #if defined(Z_MIN_PIN) && Z_MIN_PIN >= 0
+
+          #ifdef Z_DUAL_ENDSTOPS
+
+            bool z_min_endstop = READ(Z_MIN_PIN) != Z_MIN_ENDSTOP_INVERTING,
+                z2_min_endstop =
+                  #if defined(Z2_MIN_PIN) && Z2_MIN_PIN >= 0
+                    READ(Z2_MIN_PIN) != Z2_MIN_ENDSTOP_INVERTING
+                  #else
+                    z_min_endstop
+                  #endif
+                ;
+
+            bool z_min_both = z_min_endstop && old_z_min_endstop,
+                z2_min_both = z2_min_endstop && old_z2_min_endstop;
+            if ((z_min_both || z2_min_both) && current_block->steps[Z_AXIS] > 0) {
               endstops_trigsteps[Z_AXIS] = count_position[Z_AXIS];
-              endstop_z_hit=true;
-              if (!(performing_homing) || ((performing_homing)&&(z_min_endstop && old_z_min_endstop)&&(z2_min_endstop && old_z2_min_endstop))) //if not performing home or if both endstops were trigged during homing...
-              {
+              endstop_z_hit = true;
+              if (!performing_homing || (performing_homing && z_min_both && z2_min_both)) //if not performing home or if both endstops were trigged during homing...
                 step_events_completed = current_block->step_event_count;
-              } 
             }
             old_z_min_endstop = z_min_endstop;
             old_z2_min_endstop = z2_min_endstop;
-          #endif
-        #endif
+
+          #else // !Z_DUAL_ENDSTOPS
+
+            UPDATE_ENDSTOP(z, Z, min, MIN);
+
+          #endif // !Z_DUAL_ENDSTOPS
+
+        #endif // Z_MIN_PIN
 
         #ifdef Z_PROBE_ENDSTOP
           UPDATE_ENDSTOP(z, Z, probe, PROBE);
           }
           old_z_probe_endstop = z_probe_endstop;
         #endif
-      }
+        
+      } // check_endstops
+
     }
     else { // +direction
+
       Z_APPLY_DIR(!INVERT_Z_DIR,0);
       count_direction[Z_AXIS] = 1;
+
       if (check_endstops) {
+
         #if defined(Z_MAX_PIN) && Z_MAX_PIN >= 0
-          #ifndef Z_DUAL_ENDSTOPS
-            UPDATE_ENDSTOP(z, Z, max, MAX);
-          #else
-            bool z_max_endstop=(READ(Z_MAX_PIN) != Z_MAX_ENDSTOP_INVERTING);
-            #if defined(Z2_MAX_PIN) && Z2_MAX_PIN > -1
-              bool z2_max_endstop=(READ(Z2_MAX_PIN) != Z2_MAX_ENDSTOP_INVERTING);
-            #else
-              bool z2_max_endstop=z_max_endstop;
-            #endif
-            if(((z_max_endstop && old_z_max_endstop) || (z2_max_endstop && old_z2_max_endstop)) && (current_block->steps[Z_AXIS] > 0))
-            {
+
+          #ifdef Z_DUAL_ENDSTOPS
+
+            bool z_max_endstop = READ(Z_MAX_PIN) != Z_MAX_ENDSTOP_INVERTING,
+                z2_max_endstop =
+                  #if defined(Z2_MAX_PIN) && Z2_MAX_PIN >= 0
+                    READ(Z2_MAX_PIN) != Z2_MAX_ENDSTOP_INVERTING
+                  #else
+                    z_max_endstop
+                  #endif
+                ;
+
+            bool z_max_both = z_max_endstop && old_z_max_endstop,
+                z2_max_both = z2_max_endstop && old_z2_max_endstop;
+            if ((z_max_both || z2_max_both) && current_block->steps[Z_AXIS] > 0) {
               endstops_trigsteps[Z_AXIS] = count_position[Z_AXIS];
-              endstop_z_hit=true;
+              endstop_z_hit = true;
 
-//              if (z_max_endstop && old_z_max_endstop) SERIAL_ECHOLN("z_max_endstop = true");
-//              if (z2_max_endstop && old_z2_max_endstop) SERIAL_ECHOLN("z2_max_endstop = true");
+             // if (z_max_both) SERIAL_ECHOLN("z_max_endstop = true");
+             // if (z2_max_both) SERIAL_ECHOLN("z2_max_endstop = true");
 
-            
-              if (!(performing_homing) || ((performing_homing)&&(z_max_endstop && old_z_max_endstop)&&(z2_max_endstop && old_z2_max_endstop))) //if not performing home or if both endstops were trigged during homing...
-              {
+              if (!performing_homing || (performing_homing && z_max_both && z2_max_both)) //if not performing home or if both endstops were trigged during homing...
                 step_events_completed = current_block->step_event_count;
-              } 
             }
             old_z_max_endstop = z_max_endstop;
             old_z2_max_endstop = z2_max_endstop;
-          #endif
-        #endif
 
+          #else // !Z_DUAL_ENDSTOPS
+
+            UPDATE_ENDSTOP(z, Z, max, MAX);
+
+          #endif // !Z_DUAL_ENDSTOPS
+
+        #endif // Z_MAX_PIN
+        
         #ifdef Z_PROBE_ENDSTOP
           UPDATE_ENDSTOP(z, Z, probe, PROBE);
           z_probe_endstop=(READ(Z_PROBE_PIN) != Z_PROBE_ENDSTOP_INVERTING);
           }
           old_z_probe_endstop = z_probe_endstop;
         #endif
-      }
-    }
+
+      } // check_endstops
+
+    } // +direction
 
     #ifndef ADVANCE
       if (TEST(out_bits, E_AXIS)) {  // -direction
         REV_E_DIR();
-        count_direction[E_AXIS]=-1;
+        count_direction[E_AXIS] = -1;
       }
       else { // +direction
         NORM_E_DIR();
-        count_direction[E_AXIS]=1;
+        count_direction[E_AXIS] = 1;
       }
     #endif //!ADVANCE
 
     // Take multiple steps per interrupt (For high speed moves)
-    for (int8_t i=0; i < step_loops; i++) {
+    for (int8_t i = 0; i < step_loops; i++) {
       #ifndef AT90USB
         MSerial.checkRx(); // Check for serial chars.
       #endif

Marlin/ultralcd.cpp

     MENU_MULTIPLIER_ITEM_EDIT(int3, MSG_BED, &target_temperature_bed, 0, BED_MAXTEMP - 15);
   #endif
   MENU_MULTIPLIER_ITEM_EDIT(int3, MSG_FAN_SPEED, &fanSpeed, 0, 255);
-  MENU_ITEM_EDIT(int3, MSG_FLOW, &extrudemultiply, 10, 999);
+  MENU_ITEM_EDIT(int3, MSG_FLOW, &extruder_multiply[active_extruder], 10, 999);
   MENU_ITEM_EDIT(int3, MSG_FLOW MSG_F0, &extruder_multiply[0], 10, 999);
   #if TEMP_SENSOR_1 != 0
     MENU_ITEM_EDIT(int3, MSG_FLOW MSG_F1, &extruder_multiply[1], 10, 999);

Marlin/ultralcd_implementation_hitachi_HD44780.h

 
 static void lcd_implementation_drawmenu_generic(bool sel, uint8_t row, const char* pstr, char pre_char, char post_char) {
   char c;
-  uint8_t n = LCD_WIDTH - 1 - (LCD_WIDTH < 20 ? 1 : 2);
+  uint8_t n = LCD_WIDTH - 2;
   lcd.setCursor(0, row);
   lcd.print(sel ? pre_char : ' ');
   while ((c = pgm_read_byte(pstr)) && n > 0) {
   }
   while(n--) lcd.print(' ');
   lcd.print(post_char);
-  lcd.print(' ');
 }
 
 static void lcd_implementation_drawmenu_setting_edit_generic(bool sel, uint8_t row, const char* pstr, char pre_char, char* data) {
   char c;
-  uint8_t n = LCD_WIDTH - 1 - (LCD_WIDTH < 20 ? 1 : 2) - lcd_strlen(data);
+  uint8_t n = LCD_WIDTH - 2 - lcd_strlen(data);
   lcd.setCursor(0, row);
   lcd.print(sel ? pre_char : ' ');
   while ((c = pgm_read_byte(pstr)) && n > 0) {
 }
 static void lcd_implementation_drawmenu_setting_edit_generic_P(bool sel, uint8_t row, const char* pstr, char pre_char, const char* data) {
   char c;
-  uint8_t n = LCD_WIDTH - 1 - (LCD_WIDTH < 20 ? 1 : 2) - lcd_strlen_P(data);
+  uint8_t n = LCD_WIDTH - 2 - lcd_strlen_P(data);
   lcd.setCursor(0, row);
   lcd.print(sel ? pre_char : ' ');
   while ((c = pgm_read_byte(pstr)) && n > 0) {
   lcd.setCursor(1, 1);
   lcd_printPGM(pstr);
   lcd.print(':');
-  lcd.setCursor(LCD_WIDTH - (LCD_WIDTH < 20 ? 0 : 1) - lcd_strlen(value), 1);
+  lcd.setCursor(LCD_WIDTH - lcd_strlen(value), 1);
   lcd_print(value);
 }
 
-static void lcd_implementation_drawmenu_sd(bool sel, uint8_t row, const char* pstr, const char* filename, char* longFilename, uint8_t concat) {
+static void lcd_implementation_drawmenu_sd(bool sel, uint8_t row, const char* pstr, const char* filename, char* longFilename, uint8_t concat, char post_char) {
   char c;
   uint8_t n = LCD_WIDTH - concat;
   lcd.setCursor(0, row);
     filename++;
   }
   while (n--) lcd.print(' ');
+  lcd.print(post_char);
 }
 
 static void lcd_implementation_drawmenu_sdfile(bool sel, uint8_t row, const char* pstr, const char* filename, char* longFilename) {
-  lcd_implementation_drawmenu_sd(sel, row, pstr, filename, longFilename, 1);
+  lcd_implementation_drawmenu_sd(sel, row, pstr, filename, longFilename, 2, ' ');
 }
 
 static void lcd_implementation_drawmenu_sddirectory(bool sel, uint8_t row, const char* pstr, const char* filename, char* longFilename) {
-  lcd_implementation_drawmenu_sd(sel, row, pstr, filename, longFilename, 2);
+  lcd_implementation_drawmenu_sd(sel, row, pstr, filename, longFilename, 2, LCD_STR_FOLDER[0]);
 }
 
 #define lcd_implementation_drawmenu_back(sel, row, pstr, data) lcd_implementation_drawmenu_generic(sel, row, pstr, LCD_STR_UPLEVEL[0], LCD_STR_UPLEVEL[0])