Merge pull request #5110 from thinkyhead/rc_z2_min_allowed

Support Z2 min in M119 report

Marlin/endstops.cpp

     SERIAL_PROTOCOLPGM(MSG_Z_MIN);
     SERIAL_PROTOCOLLN(((READ(Z_MIN_PIN)^Z_MIN_ENDSTOP_INVERTING) ? MSG_ENDSTOP_HIT : MSG_ENDSTOP_OPEN));
   #endif
+  #if HAS_Z2_MIN
+    SERIAL_PROTOCOLPGM(MSG_Z2_MIN);
+    SERIAL_PROTOCOLLN(((READ(Z2_MIN_PIN)^Z2_MIN_ENDSTOP_INVERTING) ? MSG_ENDSTOP_HIT : MSG_ENDSTOP_OPEN));
+  #endif
   #if HAS_Z_MAX
     SERIAL_PROTOCOLPGM(MSG_Z_MAX);
     SERIAL_PROTOCOLLN(((READ(Z_MAX_PIN)^Z_MAX_ENDSTOP_INVERTING) ? MSG_ENDSTOP_HIT : MSG_ENDSTOP_OPEN));
 #if ENABLED(Z_DUAL_ENDSTOPS)
 
   // Pass the result of the endstop test
-  void Endstops::test_dual_z_endstops(EndstopEnum es1, EndstopEnum es2) {
+  void Endstops::test_dual_z_endstops(const EndstopEnum es1, const EndstopEnum es2) {
     byte z_test = TEST_ENDSTOP(es1) | (TEST_ENDSTOP(es2) << 1); // bit 0 for Z, bit 1 for Z2
     if (z_test && stepper.current_block->steps[Z_AXIS] > 0) {
       SBI(endstop_hit_bits, Z_MIN);

Marlin/endstops.h

   private:
 
     #if ENABLED(Z_DUAL_ENDSTOPS)
-      static void test_dual_z_endstops(EndstopEnum es1, EndstopEnum es2);
+      static void test_dual_z_endstops(const EndstopEnum es1, const EndstopEnum es2);
     #endif
 };
 

Marlin/language.h

 #define MSG_Y_MAX                           "y_max: "
 #define MSG_Z_MIN                           "z_min: "
 #define MSG_Z_MAX                           "z_max: "
+#define MSG_Z2_MIN                          "z2_min: "
 #define MSG_Z2_MAX                          "z2_max: "
 #define MSG_Z_PROBE                         "z_probe: "
 #define MSG_ERR_MATERIAL_INDEX              "M145 S<index> out of range (0-1)"

Marlin/stepper.cpp

   #if ENABLED(Z_DUAL_ENDSTOPS)
     #define Z_APPLY_STEP(v,Q) \
     if (performing_homing) { \
-      if (Z_HOME_DIR > 0) {\
-        if (!(TEST(endstops.old_endstop_bits, Z_MAX) && (count_direction[Z_AXIS] > 0)) && !locked_z_motor) Z_STEP_WRITE(v); \
-        if (!(TEST(endstops.old_endstop_bits, Z2_MAX) && (count_direction[Z_AXIS] > 0)) && !locked_z2_motor) Z2_STEP_WRITE(v); \
-      } \
-      else { \
+      if (Z_HOME_DIR < 0) { \
         if (!(TEST(endstops.old_endstop_bits, Z_MIN) && (count_direction[Z_AXIS] < 0)) && !locked_z_motor) Z_STEP_WRITE(v); \
         if (!(TEST(endstops.old_endstop_bits, Z2_MIN) && (count_direction[Z_AXIS] < 0)) && !locked_z2_motor) Z2_STEP_WRITE(v); \
       } \
+      else { \
+        if (!(TEST(endstops.old_endstop_bits, Z_MAX) && (count_direction[Z_AXIS] > 0)) && !locked_z_motor) Z_STEP_WRITE(v); \
+        if (!(TEST(endstops.old_endstop_bits, Z2_MAX) && (count_direction[Z_AXIS] > 0)) && !locked_z2_motor) Z2_STEP_WRITE(v); \
+      } \
     } \
     else { \
       Z_STEP_WRITE(v); \