G38 optional double touch

Made the double touch portion a conditional compile based on the
PROBE_DOUBLE_TOUCH flag.

==============================================

Bugfix

The current G38 only stopped a move if it involved the Z axis.

Moved all the G38 code to it's own section and put it where it would
always be executed no matter what axis was moving or if the endstop was
enabled.

Also added a comment to configuration_adv to alert the user the double
tap had to be turned on.

==============================================

Change G38 back to using Z_MIN_PROBE

There's no Z_MIN endstop if Z_DUAL_ENDSTOPS is enabled and you have them
set to the top of the gantry.

G38 started out as using the Z_MIN_PROBE pin.  I don't remember why we
changed it to the Z_MIN endstop.

Marlin/Configuration_adv.h

 //#define BEZIER_CURVE_SUPPORT
 
 // G38.2 and G38.3 Probe Target
+// ENABLE PROBE_DOUBLE_TOUCH if you want G38 to double touch
 //#define G38_PROBE_TARGET
 #if ENABLED(G38_PROBE_TARGET)
   #define G38_MINIMUM_MOVE 0.0275 // minimum distance in mm that will produce a move (determined using the print statement in check_move)

Marlin/Marlin_main.cpp

  * G30 - Single Z probe, probes bed at X Y location (defaults to current XY location)
  * G31 - Dock sled (Z_PROBE_SLED only)
  * G32 - Undock sled (Z_PROBE_SLED only)
- * G38 - Probe target - similar to G28 except it uses the Z_MIN endstop for all three axes
+ * G38 - Probe target - similar to G28 except it uses the Z_MIN_PROBE for all three axes
  * G90 - Use Absolute Coordinates
  * G91 - Use Relative Coordinates
  * G92 - Set current position to coordinates given
     set_current_from_steppers_for_axis(ALL_AXES);
     SYNC_PLAN_POSITION_KINEMATIC();
 
-    // Only do remaining moves if target was hit
     if (G38_endstop_hit) {
 
       G38_pass_fail = true;
 
-      // Move away by the retract distance
-      set_destination_to_current();
-      LOOP_XYZ(i) destination[i] += retract_mm[i];
-      endstops.enable(false);
-      prepare_move_to_destination();
-      stepper.synchronize();
+      #if ENABLED(PROBE_DOUBLE_TOUCH)
+        // Move away by the retract distance
+        set_destination_to_current();
+        LOOP_XYZ(i) destination[i] += retract_mm[i];
+        endstops.enable(false);
+        prepare_move_to_destination();
+        stepper.synchronize();
 
-      feedrate_mm_s /= 4;
+        feedrate_mm_s /= 4;
 
-      // Bump the target more slowly
-      LOOP_XYZ(i) destination[i] -= retract_mm[i] * 2;
+        // Bump the target more slowly
+        LOOP_XYZ(i) destination[i] -= retract_mm[i] * 2;
 
-      endstops.enable(true);
-      G38_move = true;
-      prepare_move_to_destination();
-      stepper.synchronize();
-      G38_move = false;
+        endstops.enable(true);
+        G38_move = true;
+        prepare_move_to_destination();
+        stepper.synchronize();
+        G38_move = false;
 
-      set_current_from_steppers_for_axis(ALL_AXES);
-      SYNC_PLAN_POSITION_KINEMATIC();
+        set_current_from_steppers_for_axis(ALL_AXES);
+        SYNC_PLAN_POSITION_KINEMATIC();
+      #endif
     }
 
     endstops.hit_on_purpose();
    * G38.2 - probe toward workpiece, stop on contact, signal error if failure
    * G38.3 - probe toward workpiece, stop on contact
    *
-   * Like G28 except uses Z min endstop for all axes
+   * Like G28 except uses Z min probe for all axes
    */
   inline void gcode_G38(bool is_38_2) {
     // Get X Y Z E F

Marlin/endstops.cpp

   // COPY_BIT: copy the value of SRC_BIT to DST_BIT in DST
   #define COPY_BIT(DST, SRC_BIT, DST_BIT) SET_BIT(DST, DST_BIT, TEST(DST, SRC_BIT))
 
-  #define _UPDATE_ENDSTOP(AXIS,MINMAX,CODE) do { \
+  #define UPDATE_ENDSTOP(AXIS,MINMAX) do { \
       UPDATE_ENDSTOP_BIT(AXIS, MINMAX); \
       if (TEST_ENDSTOP(_ENDSTOP(AXIS, MINMAX)) && stepper.current_block->steps[_AXIS(AXIS)] > 0) { \
         _ENDSTOP_HIT(AXIS); \
         stepper.endstop_triggered(_AXIS(AXIS)); \
-        CODE; \
       } \
     } while(0)
 
-  #if ENABLED(G38_PROBE_TARGET) && PIN_EXISTS(Z_MIN)  // If G38 command then check Z_MIN for every axis and every direction
-
-    #define UPDATE_ENDSTOP(AXIS,MINMAX) do { \
-        _UPDATE_ENDSTOP(AXIS,MINMAX,NOOP); \
-        if (G38_move) _UPDATE_ENDSTOP(Z, MIN, G38_endstop_hit = true); \
-      } while(0)
-
-  #else
-
-    #define UPDATE_ENDSTOP(AXIS,MINMAX) _UPDATE_ENDSTOP(AXIS,MINMAX,NOOP)
-
+  #if ENABLED(G38_PROBE_TARGET) && PIN_EXISTS(Z_MIN_PROBE) && !(CORE_IS_XY || CORE_IS_XZ)
+  // If G38 command then check Z_MIN_PROBE for every axis and every direction
+    if (G38_move) {
+      UPDATE_ENDSTOP_BIT(Z, MIN_PROBE);
+      if (TEST_ENDSTOP(_ENDSTOP(Z, MIN_PROBE))) {
+        if      (stepper.current_block->steps[_AXIS(X)] > 0) {_ENDSTOP_HIT(X); stepper.endstop_triggered(_AXIS(X));}
+        else if (stepper.current_block->steps[_AXIS(Y)] > 0) {_ENDSTOP_HIT(Y); stepper.endstop_triggered(_AXIS(Y));}
+        else if (stepper.current_block->steps[_AXIS(Z)] > 0) {_ENDSTOP_HIT(Z); stepper.endstop_triggered(_AXIS(Z));}
+        G38_endstop_hit = true;
+      }
+    }
   #endif
 
   #if CORE_IS_XY || CORE_IS_XZ

Marlin/example_configurations/Cartesio/Configuration_adv.h

 //#define BEZIER_CURVE_SUPPORT
 
 // G38.2 and G38.3 Probe Target
+// ENABLE PROBE_DOUBLE_TOUCH if you want G38 to double touch
 //#define G38_PROBE_TARGET
 #if ENABLED(G38_PROBE_TARGET)
   #define G38_MINIMUM_MOVE 0.0275 // minimum distance in mm that will produce a move (determined using the print statement in check_move)

Marlin/example_configurations/Felix/Configuration_adv.h

 //#define BEZIER_CURVE_SUPPORT
 
 // G38.2 and G38.3 Probe Target
+// ENABLE PROBE_DOUBLE_TOUCH if you want G38 to double touch
 //#define G38_PROBE_TARGET
 #if ENABLED(G38_PROBE_TARGET)
   #define G38_MINIMUM_MOVE 0.0275 // minimum distance in mm that will produce a move (determined using the print statement in check_move)

Marlin/example_configurations/Hephestos/Configuration_adv.h

 //#define BEZIER_CURVE_SUPPORT
 
 // G38.2 and G38.3 Probe Target
+// ENABLE PROBE_DOUBLE_TOUCH if you want G38 to double touch
 //#define G38_PROBE_TARGET
 #if ENABLED(G38_PROBE_TARGET)
   #define G38_MINIMUM_MOVE 0.0275 // minimum distance in mm that will produce a move (determined using the print statement in check_move)

Marlin/example_configurations/Hephestos_2/Configuration_adv.h

 //#define BEZIER_CURVE_SUPPORT
 
 // G38.2 and G38.3 Probe Target
+// ENABLE PROBE_DOUBLE_TOUCH if you want G38 to double touch
 //#define G38_PROBE_TARGET
 #if ENABLED(G38_PROBE_TARGET)
   #define G38_MINIMUM_MOVE 0.0275 // minimum distance in mm that will produce a move (determined using the print statement in check_move)

Marlin/example_configurations/K8200/Configuration_adv.h

 //#define BEZIER_CURVE_SUPPORT
 
 // G38.2 and G38.3 Probe Target
+// ENABLE PROBE_DOUBLE_TOUCH if you want G38 to double touch
 //#define G38_PROBE_TARGET
 #if ENABLED(G38_PROBE_TARGET)
   #define G38_MINIMUM_MOVE 0.0275 // minimum distance in mm that will produce a move (determined using the print statement in check_move)

Marlin/example_configurations/K8400/Configuration_adv.h

 //#define BEZIER_CURVE_SUPPORT
 
 // G38.2 and G38.3 Probe Target
+// ENABLE PROBE_DOUBLE_TOUCH if you want G38 to double touch
 //#define G38_PROBE_TARGET
 #if ENABLED(G38_PROBE_TARGET)
   #define G38_MINIMUM_MOVE 0.0275 // minimum distance in mm that will produce a move (determined using the print statement in check_move)

Marlin/example_configurations/RigidBot/Configuration_adv.h

 //#define BEZIER_CURVE_SUPPORT
 
 // G38.2 and G38.3 Probe Target
+// ENABLE PROBE_DOUBLE_TOUCH if you want G38 to double touch
 //#define G38_PROBE_TARGET
 #if ENABLED(G38_PROBE_TARGET)
   #define G38_MINIMUM_MOVE 0.0275 // minimum distance in mm that will produce a move (determined using the print statement in check_move)

Marlin/example_configurations/SCARA/Configuration_adv.h

 //#define BEZIER_CURVE_SUPPORT
 
 // G38.2 and G38.3 Probe Target
+// ENABLE PROBE_DOUBLE_TOUCH if you want G38 to double touch
 //#define G38_PROBE_TARGET
 #if ENABLED(G38_PROBE_TARGET)
   #define G38_MINIMUM_MOVE 0.0275 // minimum distance in mm that will produce a move (determined using the print statement in check_move)

Marlin/example_configurations/TAZ4/Configuration_adv.h

 //#define BEZIER_CURVE_SUPPORT
 
 // G38.2 and G38.3 Probe Target
+// ENABLE PROBE_DOUBLE_TOUCH if you want G38 to double touch
 //#define G38_PROBE_TARGET
 #if ENABLED(G38_PROBE_TARGET)
   #define G38_MINIMUM_MOVE 0.0275 // minimum distance in mm that will produce a move (determined using the print statement in check_move)

Marlin/example_configurations/WITBOX/Configuration_adv.h

 //#define BEZIER_CURVE_SUPPORT
 
 // G38.2 and G38.3 Probe Target
+// ENABLE PROBE_DOUBLE_TOUCH if you want G38 to double touch
 //#define G38_PROBE_TARGET
 #if ENABLED(G38_PROBE_TARGET)
   #define G38_MINIMUM_MOVE 0.0275 // minimum distance in mm that will produce a move (determined using the print statement in check_move)

Marlin/example_configurations/delta/generic/Configuration_adv.h

 //#define BEZIER_CURVE_SUPPORT
 
 // G38.2 and G38.3 Probe Target
+// ENABLE PROBE_DOUBLE_TOUCH if you want G38 to double touch
 //#define G38_PROBE_TARGET
 #if ENABLED(G38_PROBE_TARGET)
   #define G38_MINIMUM_MOVE 0.0275 // minimum distance in mm that will produce a move (determined using the print statement in check_move)

Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h

 //#define BEZIER_CURVE_SUPPORT
 
 // G38.2 and G38.3 Probe Target
+// ENABLE PROBE_DOUBLE_TOUCH if you want G38 to double touch
 //#define G38_PROBE_TARGET
 #if ENABLED(G38_PROBE_TARGET)
   #define G38_MINIMUM_MOVE 0.0275 // minimum distance in mm that will produce a move (determined using the print statement in check_move)

Marlin/example_configurations/delta/kossel_pro/Configuration_adv.h

 //#define BEZIER_CURVE_SUPPORT
 
 // G38.2 and G38.3 Probe Target
+// ENABLE PROBE_DOUBLE_TOUCH if you want G38 to double touch
 //#define G38_PROBE_TARGET
 #if ENABLED(G38_PROBE_TARGET)
   #define G38_MINIMUM_MOVE 0.0275 // minimum distance in mm that will produce a move (determined using the print statement in check_move)

Marlin/example_configurations/delta/kossel_xl/Configuration_adv.h

 //#define BEZIER_CURVE_SUPPORT
 
 // G38.2 and G38.3 Probe Target
+// ENABLE PROBE_DOUBLE_TOUCH if you want G38 to double touch
 //#define G38_PROBE_TARGET
 #if ENABLED(G38_PROBE_TARGET)
   #define G38_MINIMUM_MOVE 0.0275 // minimum distance in mm that will produce a move (determined using the print statement in check_move)

Marlin/example_configurations/makibox/Configuration_adv.h

 //#define BEZIER_CURVE_SUPPORT
 
 // G38.2 and G38.3 Probe Target
+// ENABLE PROBE_DOUBLE_TOUCH if you want G38 to double touch
 //#define G38_PROBE_TARGET
 #if ENABLED(G38_PROBE_TARGET)
   #define G38_MINIMUM_MOVE 0.0275 // minimum distance in mm that will produce a move (determined using the print statement in check_move)

Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h

 //#define BEZIER_CURVE_SUPPORT
 
 // G38.2 and G38.3 Probe Target
+// ENABLE PROBE_DOUBLE_TOUCH if you want G38 to double touch
 //#define G38_PROBE_TARGET
 #if ENABLED(G38_PROBE_TARGET)
   #define G38_MINIMUM_MOVE 0.0275 // minimum distance in mm that will produce a move (determined using the print statement in check_move)