Add support for LCM1602 16x2 I2C LCD adapter

Marlin/Configuration.h

@@ -754,6 +754,8 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 
 //#define LCD_I2C_SAINSMART_YWROBOT
 
+//#define LCM1602 // LCM1602 Adapter for 16x2 LCD
+
 // PANELOLU2 LCD with status LEDs, separate encoder and click inputs
 //
 // This uses the LiquidTWI2 library v1.2.3 or later ( https://github.com/lincomatic/LiquidTWI2 )

Marlin/Marlin.ino

@@ -40,6 +40,10 @@
   #elif ENABLED(LCD_I2C_TYPE_MCP23017) || ENABLED(LCD_I2C_TYPE_MCP23008)
     #include <Wire.h>
     #include <LiquidTWI2.h>
+  #elif ENABLED(LCM1602)
+    #include <Wire.h>
+    #include <LCD.h>
+    #include <LiquidCrystal_I2C.h>
   #elif ENABLED(DOGLCD)
     #include <U8glib.h> // library for graphics LCD by Oli Kraus (https://code.google.com/p/u8glib/)
   #else

Marlin/ultralcd_implementation_hitachi_HD44780.h

@@ -183,6 +183,12 @@ extern volatile uint8_t buttons;  //an extended version of the last checked butt
   #include <LiquidCrystal_SR.h>
   #define LCD_CLASS LiquidCrystal_SR
   LCD_CLASS lcd(SR_DATA_PIN, SR_CLK_PIN);
+#elif ENABLED(LCM1602)
+  #include <Wire.h>
+  #include <LCD.h>
+  #include <LiquidCrystal_I2C.h>
+  #define LCD_CLASS LiquidCrystal_I2C
+  LCD_CLASS lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);
 #else
   // Standard directly connected LCD implementations
   #include <LiquidCrystal.h>