Option to force X or Y to home first when homing the other axis

.travis.yml

@@ -95,17 +95,24 @@ script:
   - opt_enable REPRAP_DISCOUNT_SMART_CONTROLLER SDSUPPORT EEPROM_SETTINGS
   - opt_enable BLINKM PCA9632 RGB_LED NEOPIXEL_LED AUTO_POWER_CONTROL
   - opt_enable AUTO_BED_LEVELING_LINEAR Z_MIN_PROBE_REPEATABILITY_TEST DEBUG_LEVELING_FEATURE SKEW_CORRECTION SKEW_CORRECTION_FOR_Z SKEW_CORRECTION_GCODE
-  - opt_enable_adv FWRETRACT MAX7219_DEBUG LED_CONTROL_MENU CASE_LIGHT_ENABLE CASE_LIGHT_USE_NEOPIXEL
+  - opt_enable_adv FWRETRACT MAX7219_DEBUG LED_CONTROL_MENU CASE_LIGHT_ENABLE CASE_LIGHT_USE_NEOPIXEL CODEPENDENT_XY_HOMING
   - opt_set ABL_GRID_POINTS_X 16
   - opt_set ABL_GRID_POINTS_Y 16
   - opt_set_adv FANMUX0_PIN 53
   - build_marlin
   #
-  # Test a probeless build of AUTO_BED_LEVELING_UBL
+  # Test a probeless build of AUTO_BED_LEVELING_UBL, with lots of extruders
   #
   - restore_configs
-  - opt_enable AUTO_BED_LEVELING_UBL DEBUG_LEVELING_FEATURE G26_MESH_EDITING ENABLE_LEVELING_FADE_HEIGHT EEPROM_SETTINGS EEPROM_CHITCHAT G3D_PANEL
-  - opt_enable_adv CUSTOM_USER_MENUS I2C_POSITION_ENCODERS BABYSTEPPING BABYSTEP_XY NANODLP_Z_SYNC
+  - opt_set MOTHERBOARD BOARD_AZTEEG_X3_PRO
+  - opt_set EXTRUDERS 5
+  - opt_set TEMP_SENSOR_1 1
+  - opt_set TEMP_SENSOR_2 5
+  - opt_set TEMP_SENSOR_3 20
+  - opt_set TEMP_SENSOR_4 999
+  - opt_set TEMP_SENSOR_BED 1
+  - opt_enable AUTO_BED_LEVELING_UBL DEBUG_LEVELING_FEATURE G26_MESH_EDITING ENABLE_LEVELING_FADE_HEIGHT EEPROM_SETTINGS EEPROM_CHITCHAT G3D_PANEL SKEW_CORRECTION
+  - opt_enable_adv CUSTOM_USER_MENUS I2C_POSITION_ENCODERS BABYSTEPPING BABYSTEP_XY LIN_ADVANCE NANODLP_Z_SYNC QUICK_HOME
   - build_marlin
   #
   # Add a Sled Z Probe, use UBL Cartesian moves, use Japanese language

Marlin/Configuration_adv.h

@@ -362,6 +362,9 @@
 // When G28 is called, this option will make Y home before X
 //#define HOME_Y_BEFORE_X
 
+// Enable this if X or Y can't home without homing the other axis first.
+//#define CODEPENDENT_XY_HOMING
+
 // @section machine
 
 #define AXIS_RELATIVE_MODES {false, false, false, false}

Marlin/Marlin_main.cpp

@@ -3994,10 +3994,14 @@ inline void gcode_G28(const bool always_home_all) {
 
     #endif
 
+    // Home Y (before X)
     #if ENABLED(HOME_Y_BEFORE_X)
 
-      // Home Y
-      if (home_all || homeY) {
+      if (home_all || homeY
+        #if ENABLED(CODEPENDENT_XY_HOMING)
+          || homeX
+        #endif
+      ) {
         HOMEAXIS(Y);
         #if ENABLED(DEBUG_LEVELING_FEATURE)
           if (DEBUGGING(LEVELING)) DEBUG_POS("> homeY", current_position);
@@ -4007,7 +4011,11 @@ inline void gcode_G28(const bool always_home_all) {
     #endif
 
     // Home X
-    if (home_all || homeX) {
+    if (home_all || homeX
+      #if ENABLED(CODEPENDENT_XY_HOMING) && DISABLED(HOME_Y_BEFORE_X)
+        || homeY
+      #endif
+    ) {
 
       #if ENABLED(DUAL_X_CARRIAGE)
 
@@ -4038,8 +4046,8 @@ inline void gcode_G28(const bool always_home_all) {
       #endif
     }
 
+    // Home Y (after X)
     #if DISABLED(HOME_Y_BEFORE_X)
-      // Home Y
       if (home_all || homeY) {
         HOMEAXIS(Y);
         #if ENABLED(DEBUG_LEVELING_FEATURE)

Marlin/SanityCheck.h

@@ -888,12 +888,20 @@ static_assert(1 >= 0
 #endif
 
 /**
- * Homing Bump
+ * Homing
  */
 #if X_HOME_BUMP_MM < 0 || Y_HOME_BUMP_MM < 0 || Z_HOME_BUMP_MM < 0
   #error "[XYZ]_HOME_BUMP_MM must be greater than or equal to 0."
 #endif
 
+#if ENABLED(CODEPENDENT_XY_HOMING)
+  #if ENABLED(QUICK_HOME)
+    #error "QUICK_HOME is incompatible with CODEPENDENT_XY_HOMING."
+  #elif IS_KINEMATIC
+    #error "CODEPENDENT_XY_HOMING requires a Cartesian setup."
+  #endif
+#endif
+
 /**
  * Make sure Z_SAFE_HOMING point is reachable
  */