Smoothieboard GLCD w/ SD support (#19241)

Marlin/src/pins/lpc1769/pins_SMOOTHIEBOARD.h

@@ -111,7 +111,48 @@
 
 #elif HAS_SPI_LCD
 
-  #error "Marlin's Smoothieboard support cannot drive your LCD."
+  /*
+    The Smoothieboard supports the REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER with either
+    a custom cable with breakouts to the pins indicated below or the RRD GLCD Adapter board
+    found at http://smoothieware.org/rrdglcdadapter
+
+    Other links to information about setting up a display panel with Smoothieboard
+    http://chibidibidiwah.wdfiles.com/local--files/panel/smoothieboard2sd.jpg
+    http://smoothieware.org/panel
+  */
+
+  #if ENABLED(REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER)
+    //  EXP1 Pins
+    #define BEEPER_PIN                     P1_31  // EXP1 Pin 1
+    #define BTN_ENC                        P1_30  // EXP1 Pin 2
+    #define LCD_PINS_ENABLE                P0_18  // EXP1 Pin 3 (MOSI) 
+    #define LCD_PINS_RS                    P0_16  // EXP1 Pin 4 (CS)  
+    #define LCD_PINS_D4                    P0_15  // EXP1 Pin 5 (SCK)
+    //  EXP2 Pins 
+    #define BTN_EN2                        P3_26  // EXP2 Pin 3
+    #define BTN_EN1                        P3_25  // EXP2 Pin 5
+    
+    /*
+      SD Support
+    
+      For the RRD GLCD it CANNOT share the same SPI as the LCD so it must be
+      hooked up to the onboard SDCard SPI and use a spare pin for the SDCS.
+      Also note that an external SDCard sharing the SPI port with the
+      onboard/internal SDCard must be ejected before rebooting as the bootloader
+      does not like the external card. NOTE Smoothie will not boot if the external
+      sdcard is inserted in the RRD LCD sdcard slot at boot time, it must be
+      inserted after it has booted.
+    */
+
+    #define MISO_PIN                       P0_08  // EXP2 Pin 1 (PB3, SD_MISO)
+    #define SCK_PIN                        P0_07  // EXP2 Pin 2 (SD_SCK)    
+    #define SS_PIN                         P0_28  // EXP2 Pin 4 (SD_CSEL, SD_CS)
+    #define MOSI_PIN                       P0_09  // EXP2 Pin 6 (PB2, SD_MOSI)
+    #define SD_DETECT_PIN                  P0_27  // EXP2 Pin 7 (SD_CD, SD_DET)
+    
+  #else
+    #error "Marlin's Smoothieboard support cannot drive your LCD."
+  #endif
 
 #endif