Sanity check for more than 1 controller

Marlin/SanityCheck.h

@@ -811,3 +811,136 @@
     #error "I2C_SLAVE_ADDRESS can't be over 127. (Only 7 bits allowed.)"
   #endif
 #endif
+
+/**
+ * Make sure only one display is enabled
+ *
+ * Note: BQ_LCD_SMART_CONTROLLER => REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER
+ *       REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER => REPRAP_DISCOUNT_SMART_CONTROLLER
+ *       SAV_3DGLCD => U8GLIB_SH1106 => ULTIMAKERCONTROLLER
+ *       miniVIKI => ULTIMAKERCONTROLLER
+ *       VIKI2 => ULTIMAKERCONTROLLER
+ *       ELB_FULL_GRAPHIC_CONTROLLER => ULTIMAKERCONTROLLER
+ *       PANEL_ONE => ULTIMAKERCONTROLLER
+ */
+#define COUNT_LCD_1 0
+#if ENABLED(ULTIMAKERCONTROLLER) \
+    && DISABLED(SAV_3DGLCD) && DISABLED(miniVIKI) && DISABLED(VIKI2) \
+    && DISABLED(ELB_FULL_GRAPHIC_CONTROLLER) && DISABLED(PANEL_ONE)
+  #define COUNT_LCD_2 INCREMENT(COUNT_LCD_1)
+#else
+  #define COUNT_LCD_2 COUNT_LCD_1
+#endif
+#if ENABLED(REPRAP_DISCOUNT_SMART_CONTROLLER) && DISABLED(REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER)
+  #define COUNT_LCD_3 INCREMENT(COUNT_LCD_2)
+#else
+  #define COUNT_LCD_3 COUNT_LCD_2
+#endif
+#if ENABLED(REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER) && DISABLED(BQ_LCD_SMART_CONTROLLER)
+  #define COUNT_LCD_4 INCREMENT(COUNT_LCD_3)
+#else
+  #define COUNT_LCD_4 COUNT_LCD_3
+#endif
+#if ENABLED(CARTESIO_UI)
+  #define COUNT_LCD_5 INCREMENT(COUNT_LCD_4)
+#else
+  #define COUNT_LCD_5 COUNT_LCD_4
+#endif
+#if ENABLED(PANEL_ONE)
+  #define COUNT_LCD_6 INCREMENT(COUNT_LCD_5)
+#else
+  #define COUNT_LCD_6 COUNT_LCD_5
+#endif
+#if ENABLED(MAKRPANEL)
+  #define COUNT_LCD_7 INCREMENT(COUNT_LCD_6)
+#else
+  #define COUNT_LCD_7 COUNT_LCD_6
+#endif
+#if ENABLED(REPRAPWORLD_GRAPHICAL_LCD)
+  #define COUNT_LCD_8 INCREMENT(COUNT_LCD_7)
+#else
+  #define COUNT_LCD_8 COUNT_LCD_7
+#endif
+#if ENABLED(VIKI2)
+  #define COUNT_LCD_9 INCREMENT(COUNT_LCD_8)
+#else
+  #define COUNT_LCD_9 COUNT_LCD_8
+#endif
+#if ENABLED(miniVIKI)
+  #define COUNT_LCD_10 INCREMENT(COUNT_LCD_9)
+#else
+  #define COUNT_LCD_10 COUNT_LCD_9
+#endif
+#if ENABLED(ELB_FULL_GRAPHIC_CONTROLLER)
+  #define COUNT_LCD_11 INCREMENT(COUNT_LCD_10)
+#else
+  #define COUNT_LCD_11 COUNT_LCD_10
+#endif
+#if ENABLED(G3D_PANEL)
+  #define COUNT_LCD_12 INCREMENT(COUNT_LCD_11)
+#else
+  #define COUNT_LCD_12 COUNT_LCD_11
+#endif
+#if ENABLED(MINIPANEL)
+  #define COUNT_LCD_13 INCREMENT(COUNT_LCD_12)
+#else
+  #define COUNT_LCD_13 COUNT_LCD_12
+#endif
+#if ENABLED(REPRAPWORLD_KEYPAD)
+  #define COUNT_LCD_14 INCREMENT(COUNT_LCD_13)
+#else
+  #define COUNT_LCD_14 COUNT_LCD_13
+#endif
+#if ENABLED(RIGIDBOT_PANEL)
+  #define COUNT_LCD_15 INCREMENT(COUNT_LCD_14)
+#else
+  #define COUNT_LCD_15 COUNT_LCD_14
+#endif
+#if ENABLED(RA_CONTROL_PANEL)
+  #define COUNT_LCD_16 INCREMENT(COUNT_LCD_15)
+#else
+  #define COUNT_LCD_16 COUNT_LCD_15
+#endif
+#if ENABLED(LCD_I2C_SAINSMART_YWROBOT)
+  #define COUNT_LCD_17 INCREMENT(COUNT_LCD_16)
+#else
+  #define COUNT_LCD_17 COUNT_LCD_16
+#endif
+#if ENABLED(LCM1602)
+  #define COUNT_LCD_18 INCREMENT(COUNT_LCD_17)
+#else
+  #define COUNT_LCD_18 COUNT_LCD_17
+#endif
+#if ENABLED(LCD_I2C_PANELOLU2)
+  #define COUNT_LCD_19 INCREMENT(COUNT_LCD_18)
+#else
+  #define COUNT_LCD_19 COUNT_LCD_18
+#endif
+#if ENABLED(LCD_I2C_VIKI)
+  #define COUNT_LCD_20 INCREMENT(COUNT_LCD_19)
+#else
+  #define COUNT_LCD_20 COUNT_LCD_19
+#endif
+#if ENABLED(U8GLIB_SSD1306)
+  #define COUNT_LCD_21 INCREMENT(COUNT_LCD_20)
+#else
+  #define COUNT_LCD_21 COUNT_LCD_20
+#endif
+#if ENABLED(SAV_3DLCD)
+  #define COUNT_LCD_22 INCREMENT(COUNT_LCD_21)
+#else
+  #define COUNT_LCD_22 COUNT_LCD_21
+#endif
+#if ENABLED(BQ_LCD_SMART_CONTROLLER)
+  #define COUNT_LCD_23 INCREMENT(COUNT_LCD_22)
+#else
+  #define COUNT_LCD_23 COUNT_LCD_22
+#endif
+#if ENABLED(SAV_3DGLCD)
+  #define COUNT_LCD_24 INCREMENT(COUNT_LCD_23)
+#else
+  #define COUNT_LCD_24 COUNT_LCD_23
+#endif
+#if COUNT_LCD_24 > 1
+  #error "Please select no more than one LCD controller option."
+#endif