Fix Endstop check for CoreXY bots.

The X_Axis could not home to min while Y_Max endstop was trigged.

Marlin/Marlin.h

@@ -181,7 +181,7 @@ void manage_inactivity(bool ignore_stepper_queue=false);
 #endif
 
 enum AxisEnum {X_AXIS=0, Y_AXIS=1, Z_AXIS=2, E_AXIS=3, X_HEAD=4, Y_HEAD=5}; 
-
+//X_HEAD and Y_HEAD is used for systems that don't have a 1:1 relationship between X_AXIS and X Head movement, like CoreXY bots.
 
 void FlushSerialRequestResend();
 void ClearToSend();

Marlin/stepper.cpp

@@ -399,24 +399,24 @@ ISR(TIMER1_COMPA_vect)
       count_direction[Y_AXIS]=1;
     }
 
-    // Set direction en check limit switches
+    if(check_endstops) // check X and Y Endstops
+    {
         #ifndef COREXY
-    if ((out_bits & (1<<X_AXIS)) != 0)   // stepping along -X axis
+        if ((out_bits & (1<<X_AXIS)) != 0)   // stepping along -X axis (regular cartesians bot)
         #else
+        if (!((current_block->steps_x == current_block->steps_y) && ((out_bits & (1<<X_AXIS))>>X_AXIS != (out_bits & (1<<Y_AXIS))>>Y_AXIS))) // AlexBorro: If DeltaX == -DeltaY, the movement is only in Y axis
         if ((out_bits & (1<<X_HEAD)) != 0) //AlexBorro: Head direction in -X axis for CoreXY bots.
         #endif
-    {
+        { // -direction
-      CHECK_ENDSTOPS
-      {
             #ifdef DUAL_X_CARRIAGE
             // with 2 x-carriages, endstops are only checked in the homing direction for the active extruder
-        if ((current_block->active_extruder == 0 && X_HOME_DIR == -1) 
+            if ((current_block->active_extruder == 0 && X_HOME_DIR == -1) || (current_block->active_extruder != 0 && X2_HOME_DIR == -1))
-            || (current_block->active_extruder != 0 && X2_HOME_DIR == -1))
             #endif          
             {
                 #if defined(X_MIN_PIN) && X_MIN_PIN > -1
                 bool x_min_endstop=(READ(X_MIN_PIN) != X_MIN_ENDSTOP_INVERTING);
-            if(x_min_endstop && old_x_min_endstop && (current_block->steps_x > 0)) {
+                if(x_min_endstop && old_x_min_endstop && (current_block->steps_x > 0))
+                {
                     endstops_trigsteps[X_AXIS] = count_position[X_AXIS];
                     endstop_x_hit=true;
                     step_events_completed = current_block->step_event_count;
@@ -425,20 +425,17 @@ ISR(TIMER1_COMPA_vect)
                 #endif
             }
         }
-    }
         else 
         { // +direction
-      CHECK_ENDSTOPS
-      {
             #ifdef DUAL_X_CARRIAGE
             // with 2 x-carriages, endstops are only checked in the homing direction for the active extruder
-        if ((current_block->active_extruder == 0 && X_HOME_DIR == 1) 
+            if ((current_block->active_extruder == 0 && X_HOME_DIR == 1) || (current_block->active_extruder != 0 && X2_HOME_DIR == 1))
-            || (current_block->active_extruder != 0 && X2_HOME_DIR == 1))
             #endif          
             {
                 #if defined(X_MAX_PIN) && X_MAX_PIN > -1
                 bool x_max_endstop=(READ(X_MAX_PIN) != X_MAX_ENDSTOP_INVERTING);
-            if(x_max_endstop && old_x_max_endstop && (current_block->steps_x > 0)){
+                if(x_max_endstop && old_x_max_endstop && (current_block->steps_x > 0))
+                {
                     endstops_trigsteps[X_AXIS] = count_position[X_AXIS];
                     endstop_x_hit=true;
                     step_events_completed = current_block->step_event_count;
@@ -447,19 +444,18 @@ ISR(TIMER1_COMPA_vect)
                 #endif
             }
         }
-    }
 
         #ifndef COREXY
         if ((out_bits & (1<<Y_AXIS)) != 0)   // -direction
         #else
+        if (!((current_block->steps_x == current_block->steps_y) && ((out_bits & (1<<X_AXIS))>>X_AXIS == (out_bits & (1<<Y_AXIS))>>Y_AXIS))) // AlexBorro: If DeltaX == DeltaY, the movement is only in X axis
         if ((out_bits & (1<<Y_HEAD)) != 0)  //AlexBorro: Head direction in -Y axis for CoreXY bots.
         #endif
-    {
+        { // -direction
-      CHECK_ENDSTOPS
-      {
             #if defined(Y_MIN_PIN) && Y_MIN_PIN > -1
             bool y_min_endstop=(READ(Y_MIN_PIN) != Y_MIN_ENDSTOP_INVERTING);
-          if(y_min_endstop && old_y_min_endstop && (current_block->steps_y > 0)) {
+            if(y_min_endstop && old_y_min_endstop && (current_block->steps_y > 0))
+            {
                 endstops_trigsteps[Y_AXIS] = count_position[Y_AXIS];
                 endstop_y_hit=true;
                 step_events_completed = current_block->step_event_count;
@@ -467,20 +463,19 @@ ISR(TIMER1_COMPA_vect)
             old_y_min_endstop = y_min_endstop;
             #endif
         }
-    }
         else 
         { // +direction
-      CHECK_ENDSTOPS
-      {
             #if defined(Y_MAX_PIN) && Y_MAX_PIN > -1
             bool y_max_endstop=(READ(Y_MAX_PIN) != Y_MAX_ENDSTOP_INVERTING);
-          if(y_max_endstop && old_y_max_endstop && (current_block->steps_y > 0)){
+            if(y_max_endstop && old_y_max_endstop && (current_block->steps_y > 0))
+            {
                 endstops_trigsteps[Y_AXIS] = count_position[Y_AXIS];
                 endstop_y_hit=true;
                 step_events_completed = current_block->step_event_count;
             }
             old_y_max_endstop = y_max_endstop;
             #endif
+
         }
     }