Merge pull request #4749 from thinkyhead/rc_minumum_minimum

Fix a misspelling of minimum

Marlin/Configuration.h

 #define DEFAULT_RETRACT_ACCELERATION  3000    // E acceleration in mm/s^2 for retracts
 #define DEFAULT_TRAVEL_ACCELERATION   3000    // X, Y, Z acceleration in mm/s^2 for travel (non printing) moves
 
-// "Jerk" specifies the minumum speed change that requires acceleration.
+// "Jerk" specifies the minimum speed change that requires acceleration.
 // When changing speed and direction, if the difference is less than the
 // value set here, it may happen instantaneously.
 #define DEFAULT_XYJERK                20.0    // (mm/sec)

Marlin/example_configurations/Cartesio/Configuration.h

 #define DEFAULT_RETRACT_ACCELERATION  10000   // E acceleration in mm/s^2 for retracts
 #define DEFAULT_TRAVEL_ACCELERATION   1000    // X, Y, Z acceleration in mm/s^2 for travel (non printing) moves
 
-// "Jerk" specifies the minumum speed change that requires acceleration.
+// "Jerk" specifies the minimum speed change that requires acceleration.
 // When changing speed and direction, if the difference is less than the
 // value set here, it may happen instantaneously.
 #define DEFAULT_XYJERK                10.0    // (mm/sec)

Marlin/example_configurations/Felix/Configuration.h

 #define DEFAULT_RETRACT_ACCELERATION  5000    // E acceleration in mm/s^2 for retracts
 #define DEFAULT_TRAVEL_ACCELERATION   3000    // X, Y, Z acceleration in mm/s^2 for travel (non printing) moves
 
-// "Jerk" specifies the minumum speed change that requires acceleration.
+// "Jerk" specifies the minimum speed change that requires acceleration.
 // When changing speed and direction, if the difference is less than the
 // value set here, it may happen instantaneously.
 #define DEFAULT_XYJERK                10.0    // (mm/sec)

Marlin/example_configurations/Felix/DUAL/Configuration.h

 #define DEFAULT_RETRACT_ACCELERATION  5000    // E acceleration in mm/s^2 for retracts
 #define DEFAULT_TRAVEL_ACCELERATION   3000    // X, Y, Z acceleration in mm/s^2 for travel (non printing) moves
 
-// "Jerk" specifies the minumum speed change that requires acceleration.
+// "Jerk" specifies the minimum speed change that requires acceleration.
 // When changing speed and direction, if the difference is less than the
 // value set here, it may happen instantaneously.
 #define DEFAULT_XYJERK                10.0    // (mm/sec)

Marlin/example_configurations/Hephestos/Configuration.h

 #define DEFAULT_RETRACT_ACCELERATION  1000    // E acceleration in mm/s^2 for retracts
 #define DEFAULT_TRAVEL_ACCELERATION   1000    // X, Y, Z acceleration in mm/s^2 for travel (non printing) moves
 
-// "Jerk" specifies the minumum speed change that requires acceleration.
+// "Jerk" specifies the minimum speed change that requires acceleration.
 // When changing speed and direction, if the difference is less than the
 // value set here, it may happen instantaneously.
 #define DEFAULT_XYJERK                10.0    // (mm/sec)

Marlin/example_configurations/Hephestos_2/Configuration.h

 #define DEFAULT_RETRACT_ACCELERATION  3000    // E acceleration in mm/s^2 for retracts
 #define DEFAULT_TRAVEL_ACCELERATION   1000    // X, Y, Z acceleration in mm/s^2 for travel (non printing) moves
 
-// "Jerk" specifies the minumum speed change that requires acceleration.
+// "Jerk" specifies the minimum speed change that requires acceleration.
 // When changing speed and direction, if the difference is less than the
 // value set here, it may happen instantaneously.
 #define DEFAULT_XYJERK                20.0    // (mm/sec)

Marlin/example_configurations/K8200/Configuration.h

 #define DEFAULT_RETRACT_ACCELERATION  1000    // E acceleration in mm/s^2 for retracts
 #define DEFAULT_TRAVEL_ACCELERATION   1000    // X, Y, Z acceleration in mm/s^2 for travel (non printing) moves
 
-// "Jerk" specifies the minumum speed change that requires acceleration.
+// "Jerk" specifies the minimum speed change that requires acceleration.
 // When changing speed and direction, if the difference is less than the
 // value set here, it may happen instantaneously.
 #define DEFAULT_XYJERK                20.0    // (mm/sec)

Marlin/example_configurations/K8400/Configuration.h

 #define DEFAULT_RETRACT_ACCELERATION  6000    // E acceleration in mm/s^2 for retracts
 #define DEFAULT_TRAVEL_ACCELERATION   3000    // X, Y, Z acceleration in mm/s^2 for travel (non printing) moves
 
-// "Jerk" specifies the minumum speed change that requires acceleration.
+// "Jerk" specifies the minimum speed change that requires acceleration.
 // When changing speed and direction, if the difference is less than the
 // value set here, it may happen instantaneously.
 #define DEFAULT_XYJERK                10.0    // (mm/sec)

Marlin/example_configurations/K8400/Dual-head/Configuration.h

 #define DEFAULT_RETRACT_ACCELERATION  6000    // E acceleration in mm/s^2 for retracts
 #define DEFAULT_TRAVEL_ACCELERATION   3000    // X, Y, Z acceleration in mm/s^2 for travel (non printing) moves
 
-// "Jerk" specifies the minumum speed change that requires acceleration.
+// "Jerk" specifies the minimum speed change that requires acceleration.
 // When changing speed and direction, if the difference is less than the
 // value set here, it may happen instantaneously.
 #define DEFAULT_XYJERK                10.0    // (mm/sec)

Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h

 #define DEFAULT_RETRACT_ACCELERATION  3000    // E acceleration in mm/s^2 for retracts
 #define DEFAULT_TRAVEL_ACCELERATION   3000    // X, Y, Z acceleration in mm/s^2 for travel (non printing) moves
 
-// "Jerk" specifies the minumum speed change that requires acceleration.
+// "Jerk" specifies the minimum speed change that requires acceleration.
 // When changing speed and direction, if the difference is less than the
 // value set here, it may happen instantaneously.
 #define DEFAULT_XYJERK                20.0    // (mm/sec)

Marlin/example_configurations/RigidBot/Configuration.h

 #define DEFAULT_RETRACT_ACCELERATION  1000    // E acceleration in mm/s^2 for retracts
 #define DEFAULT_TRAVEL_ACCELERATION   3000    // X, Y, Z acceleration in mm/s^2 for travel (non printing) moves
 
-// "Jerk" specifies the minumum speed change that requires acceleration.
+// "Jerk" specifies the minimum speed change that requires acceleration.
 // When changing speed and direction, if the difference is less than the
 // value set here, it may happen instantaneously.
 #define DEFAULT_XYJERK                8.0     // (mm/sec)

Marlin/example_configurations/SCARA/Configuration.h

 #define DEFAULT_RETRACT_ACCELERATION  2000   // E acceleration in mm/s^2 for retracts
 #define DEFAULT_TRAVEL_ACCELERATION   400    // X, Y, Z acceleration in mm/s^2 for travel (non printing) moves
 
-// "Jerk" specifies the minumum speed change that requires acceleration.
+// "Jerk" specifies the minimum speed change that requires acceleration.
 // When changing speed and direction, if the difference is less than the
 // value set here, it may happen instantaneously.
 #define DEFAULT_XYJERK                5.0     // (mm/sec)

Marlin/example_configurations/TAZ4/Configuration.h

 #define DEFAULT_RETRACT_ACCELERATION  3000    // E acceleration in mm/s^2 for retracts
 #define DEFAULT_TRAVEL_ACCELERATION   3000    // X, Y, Z acceleration in mm/s^2 for travel (non printing) moves
 
-// "Jerk" specifies the minumum speed change that requires acceleration.
+// "Jerk" specifies the minimum speed change that requires acceleration.
 // When changing speed and direction, if the difference is less than the
 // value set here, it may happen instantaneously.
 #define DEFAULT_XYJERK                 8.0    // (mm/sec)

Marlin/example_configurations/WITBOX/Configuration.h

 #define DEFAULT_RETRACT_ACCELERATION  3000    // E acceleration in mm/s^2 for retracts
 #define DEFAULT_TRAVEL_ACCELERATION   3000    // X, Y, Z acceleration in mm/s^2 for travel (non printing) moves
 
-// "Jerk" specifies the minumum speed change that requires acceleration.
+// "Jerk" specifies the minimum speed change that requires acceleration.
 // When changing speed and direction, if the difference is less than the
 // value set here, it may happen instantaneously.
 #define DEFAULT_XYJERK                10.0    // (mm/sec)

Marlin/example_configurations/adafruit/ST7565/Configuration.h

 #define DEFAULT_RETRACT_ACCELERATION  3000    // E acceleration in mm/s^2 for retracts
 #define DEFAULT_TRAVEL_ACCELERATION   3000    // X, Y, Z acceleration in mm/s^2 for travel (non printing) moves
 
-// "Jerk" specifies the minumum speed change that requires acceleration.
+// "Jerk" specifies the minimum speed change that requires acceleration.
 // When changing speed and direction, if the difference is less than the
 // value set here, it may happen instantaneously.
 #define DEFAULT_XYJERK                20.0    // (mm/sec)

Marlin/example_configurations/delta/biv2.5/Configuration.h

 #define DEFAULT_RETRACT_ACCELERATION  3000    // E acceleration in mm/s^2 for retracts
 #define DEFAULT_TRAVEL_ACCELERATION   3000    // X, Y, Z acceleration in mm/s^2 for travel (non printing) moves
 
-// "Jerk" specifies the minumum speed change that requires acceleration.
+// "Jerk" specifies the minimum speed change that requires acceleration.
 // When changing speed and direction, if the difference is less than the
 // value set here, it may happen instantaneously.
 #define DEFAULT_XYJERK                15.0    // (mm/sec)

Marlin/example_configurations/delta/generic/Configuration.h

 #define DEFAULT_RETRACT_ACCELERATION  3000    // E acceleration in mm/s^2 for retracts
 #define DEFAULT_TRAVEL_ACCELERATION   3000    // X, Y, Z acceleration in mm/s^2 for travel (non printing) moves
 
-// "Jerk" specifies the minumum speed change that requires acceleration.
+// "Jerk" specifies the minimum speed change that requires acceleration.
 // When changing speed and direction, if the difference is less than the
 // value set here, it may happen instantaneously.
 #define DEFAULT_XYJERK                20.0    // (mm/sec)

Marlin/example_configurations/delta/kossel_mini/Configuration.h

 #define DEFAULT_RETRACT_ACCELERATION  3000    // E acceleration in mm/s^2 for retracts
 #define DEFAULT_TRAVEL_ACCELERATION   3000    // X, Y, Z acceleration in mm/s^2 for travel (non printing) moves
 
-// "Jerk" specifies the minumum speed change that requires acceleration.
+// "Jerk" specifies the minimum speed change that requires acceleration.
 // When changing speed and direction, if the difference is less than the
 // value set here, it may happen instantaneously.
 #define DEFAULT_XYJERK                20.0    // (mm/sec)

Marlin/example_configurations/delta/kossel_pro/Configuration.h

 #define DEFAULT_RETRACT_ACCELERATION  3000    // E acceleration in mm/s^2 for retracts
 #define DEFAULT_TRAVEL_ACCELERATION   3000    // X, Y, Z acceleration in mm/s^2 for travel (non printing) moves
 
-// "Jerk" specifies the minumum speed change that requires acceleration.
+// "Jerk" specifies the minimum speed change that requires acceleration.
 // When changing speed and direction, if the difference is less than the
 // value set here, it may happen instantaneously.
 #define DEFAULT_XYJERK                20.0    // (mm/sec)

Marlin/example_configurations/delta/kossel_xl/Configuration.h

 #define DEFAULT_RETRACT_ACCELERATION  3000    // E acceleration in mm/s^2 for retracts
 #define DEFAULT_TRAVEL_ACCELERATION   3000    // X, Y, Z acceleration in mm/s^2 for travel (non printing) moves
 
-// "Jerk" specifies the minumum speed change that requires acceleration.
+// "Jerk" specifies the minimum speed change that requires acceleration.
 // When changing speed and direction, if the difference is less than the
 // value set here, it may happen instantaneously.
 #define DEFAULT_XYJERK                20.0    // (mm/sec)

Marlin/example_configurations/makibox/Configuration.h

 #define DEFAULT_RETRACT_ACCELERATION  3000    // E acceleration in mm/s^2 for retracts
 #define DEFAULT_TRAVEL_ACCELERATION   3000    // X, Y, Z acceleration in mm/s^2 for travel (non printing) moves
 
-// "Jerk" specifies the minumum speed change that requires acceleration.
+// "Jerk" specifies the minimum speed change that requires acceleration.
 // When changing speed and direction, if the difference is less than the
 // value set here, it may happen instantaneously.
 #define DEFAULT_XYJERK                20.0    // (mm/sec)

Marlin/example_configurations/tvrrug/Round2/Configuration.h

 #define DEFAULT_RETRACT_ACCELERATION  3000   // E acceleration in mm/s^2 for retracts
 #define DEFAULT_TRAVEL_ACCELERATION   500    // X, Y, Z acceleration in mm/s^2 for travel (non printing) moves
 
-// "Jerk" specifies the minumum speed change that requires acceleration.
+// "Jerk" specifies the minimum speed change that requires acceleration.
 // When changing speed and direction, if the difference is less than the
 // value set here, it may happen instantaneously.
 #define DEFAULT_XYJERK                20.0    // (mm/sec)

Marlin/stepper.cpp

           counter_E -= current_block->step_event_count;
           #if DISABLED(MIXING_EXTRUDER)
             // Don't step E here for mixing extruder
-            e_steps[TOOL_E_INDEX] += motor_direction(E_AXIS) ? -1 : 1;
+            motor_direction(E_AXIS) ? --e_steps[TOOL_E_INDEX] : ++e_steps[TOOL_E_INDEX];
           #endif
         }