BTT SKR 1.3 pins for Anet Full Graphics LCD (#16047)

Marlin/src/pins/lpc1768/pins_BTT_SKR_V1_3.h

@@ -179,22 +179,59 @@
  *               EXP2                                               EXP1
  */
 #if HAS_SPI_LCD
-  #define BTN_ENC          P0_28   // (58) open-drain
 
-  #if ENABLED(CR10_STOCKDISPLAY)
+  #if ENABLED(ANET_FULL_GRAPHICS_LCD)
+
+    #error "CAUTION! ANET_FULL_GRAPHICS_LCD requires wiring modifications. See 'pins_BTT_SKR_V1_3.h' for details. Comment out this line to continue."
+
+   /**
+    * 1. Cut the tab off the LCD connector so it can be plugged into the "EXP1" connector the other way.
+    * 2. Swap the LCD's +5V (Pin2) and GND (Pin1) wires. (This is the critical part!)
+    * 3. Rewire the CLK Signal (LCD Pin9) to LCD Pin7. (LCD Pin9 remains open because this pin is open drain.)
+    * 4. A wire is needed to connect the Reset switch at J3 (LCD Pin7) to EXP2 (Pin3) on the board.
+    *
+    * !!! If you are unsure, ask for help! Your motherboard may be damaged in some circumstances !!!
+    *
+    * The ANET_FULL_GRAPHICS_LCD connector plug:
+    *
+    *                  BEFORE                          AFTER
+    *                  _____                           _____
+    *           GND 1 | · · |  2 5V              5V 1 | · · |  2 GND
+    *            CS 3 | · · |  4 BTN_EN2         CS 3 | · · |  4 BTN_EN2
+    *           SID 5 | · · |  6 BTN_EN1        SID 5 | · · |  6 BTN_EN1
+    *          open 7 | · · |  8 BTN_ENC        CLK 7 | · · |  8 BTN_ENC
+    *           CLK 9 | · · | 10 Beeper        open 9 | · · | 10 Beeper
+    *                  -----                           -----
+    *                   LCD                             LCD
+    */
+
+    #define LCD_PINS_RS    P1_23
+
+    #define BTN_EN1        P1_20
+    #define BTN_EN2        P1_22
+    #define BTN_ENC        P1_18
+
+    #define LCD_PINS_ENABLE P1_21
+    #define LCD_PINS_D4    P1_19
+
+  #elif ENABLED(CR10_STOCKDISPLAY)
+
     #define LCD_PINS_RS    P1_22
 
     #define BTN_EN1        P1_18
     #define BTN_EN2        P1_20
+    #define BTN_ENC        P0_28   // (58) open-drain
 
     #define LCD_PINS_ENABLE P1_23
     #define LCD_PINS_D4    P1_21
 
-  #else
+  #else // !CR10_STOCKDISPLAY
+
     #define LCD_PINS_RS    P1_19
 
     #define BTN_EN1        P3_26   // (31) J3-2 & AUX-4
     #define BTN_EN2        P3_25   // (33) J3-4 & AUX-4
+    #define BTN_ENC        P0_28   // (58) open-drain
 
     #define LCD_PINS_ENABLE P1_18
     #define LCD_PINS_D4    P1_20
@@ -247,7 +284,7 @@
 
     #endif // !FYSETC_MINI_12864
 
-  #endif
+  #endif // !CR10_STOCKDISPLAY
 
 #endif // HAS_SPI_LCD