Merge pull request #4927 from thinkyhead/rc_bltouch_noraise

Don't check Z_MAX on raise when the probe pwns the pin

Marlin/Marlin_main.cpp

     SERIAL_ECHOPGM("Probe: ");
     #if ENABLED(FIX_MOUNTED_PROBE)
       SERIAL_ECHOLNPGM("FIX_MOUNTED_PROBE");
-    #elif HAS_Z_SERVO_ENDSTOP
-      SERIAL_ECHOLNPGM("SERVO PROBE");
     #elif ENABLED(BLTOUCH)
       SERIAL_ECHOLNPGM("BLTOUCH");
+    #elif HAS_Z_SERVO_ENDSTOP
+      SERIAL_ECHOLNPGM("SERVO PROBE");
     #elif ENABLED(Z_PROBE_SLED)
       SERIAL_ECHOLNPGM("Z_PROBE_SLED");
     #elif ENABLED(Z_PROBE_ALLEN_KEY)

Marlin/endstops.cpp

   #else
       if (stepper.motor_direction(Z_AXIS))
   #endif
-      { // z -direction
+      { // Z -direction. Gantry down, bed up.
         #if HAS_Z_MIN
 
           #if ENABLED(Z_DUAL_ENDSTOPS)
 
         #endif // HAS_Z_MIN
 
+        // When closing the gap check the enabled probe
         #if ENABLED(Z_MIN_PROBE_ENDSTOP)
           if (z_probe_enabled) {
             UPDATE_ENDSTOP(Z, MIN_PROBE);
           }
         #endif
       }
-      else { // z +direction
+      else { // Z +direction. Gantry up, bed down.
         #if HAS_Z_MAX
 
+          // Check both Z dual endstops
           #if ENABLED(Z_DUAL_ENDSTOPS)
 
             UPDATE_ENDSTOP_BIT(Z, MAX);
 
             test_dual_z_endstops(Z_MAX, Z2_MAX);
 
-          #else // !Z_DUAL_ENDSTOPS
+          // If this pin is not hijacked for the bed probe
+          // then it belongs to the Z endstop
+          #elif DISABLED(Z_MIN_PROBE_ENDSTOP) || Z_MAX_PIN != Z_MIN_PROBE_PIN
 
             UPDATE_ENDSTOP(Z, MAX);
 
-          #endif // !Z_DUAL_ENDSTOPS
+          #endif // !Z_MIN_PROBE_PIN...
         #endif // Z_MAX_PIN
       }
   #if ENABLED(COREXZ)