Support for REPRAPWORLD_GRAPHICAL_LCD

Marlin/pins_MEGATRONICS_3.h

@@ -106,17 +106,49 @@
 
 #define BEEPER_PIN 61
 
-#define LCD_PINS_RS 32
-#define LCD_PINS_ENABLE 31
-#define LCD_PINS_D4 14
-#define LCD_PINS_D5 30
-#define LCD_PINS_D6 39
-#define LCD_PINS_D7 15
 
-#define SHIFT_CLK 43
-#define SHIFT_LD 35
-#define SHIFT_OUT 34
-#define SHIFT_EN 44
+
+
+#if ENABLED(DOGLCD)
+
+    #if ENABLED(U8GLIB_ST7920)
+    
+        #define LCD_PINS_RS     56 //CS chip select /SS chip slave select
+        #define LCD_PINS_ENABLE 51 //SID (MOSI)
+        #define LCD_PINS_D4     52 //SCK (CLK) clock     
+
+        #define BTN_EN1             44
+        #define BTN_EN2             45
+        #define BTN_ENC             33
+
+        
+        #define SD_DETECT_PIN 35
+    #endif
+
+#else
+  #define LCD_PINS_RS 32
+  #define LCD_PINS_ENABLE 31
+  #define LCD_PINS_D4 14
+  #define LCD_PINS_D5 30
+  #define LCD_PINS_D6 39
+  #define LCD_PINS_D7 15
+  
+  #define SHIFT_CLK 43
+  #define SHIFT_LD 35
+  #define SHIFT_OUT 34
+  #define SHIFT_EN 44
+  //buttons are directly attached using keypad
+  #define BTN_EN1 44
+  #define BTN_EN2 45
+  #define BTN_ENC 33 //the click
+
+  #define BLEN_C 2
+  #define BLEN_B 1
+  #define BLEN_A 0
+
+  #define SD_DETECT_PIN 56 // Megatronics v3.1 only
+#endif
+
 
 // Buttons are directly attached using keypad
 #define BTN_EN1 44