SDCARDDETECT -> SD_DETECT, added docs

- `SD_DETECT_PIN` replaces `SDCARDDETECT`
- `SD_DETECT_INVERTED` replaces `SDCARDDETECTINVERTED`
- Revise the description of `SD_DETECT_INVERTED`
- Add a note about the override of `SD_DETECT_INVERTED` in
`Conditionals.h`

Marlin/Conditionals.h

   #endif
 
   #if ENABLED(ULTIPANEL) && DISABLED(ELB_FULL_GRAPHIC_CONTROLLER)
-    #undef SDCARDDETECTINVERTED
+    #undef SD_DETECT_INVERTED
   #endif
 
   // Power Signal Control Definitions

Marlin/Configuration.h

 //
 // ==> REMEMBER TO INSTALL U8glib to your ARDUINO library folder: http://code.google.com/p/u8glib/wiki/u8glib
 //#define ELB_FULL_GRAPHIC_CONTROLLER
-//#define SDCARDDETECTINVERTED
+//#define SD_DETECT_INVERTED
 
 // The RepRapDiscount Smart Controller (white PCB)
 // http://reprap.org/wiki/RepRapDiscount_Smart_Controller

Marlin/Configuration_adv.h

 
 #if ENABLED(SDSUPPORT)
 
-  // If you are using a RAMPS board or cheap E-bay purchased boards that do not detect when an SD card is inserted
-  // You can get round this by connecting a push button or single throw switch to the pin defined as SDCARDCARDDETECT
-  // in the pins.h file.  When using a push button pulling the pin to ground this will need inverted.  This setting should
-  // be commented out otherwise
-  #ifndef ELB_FULL_GRAPHIC_CONTROLLER
-    #define SDCARDDETECTINVERTED
-  #endif
+  // Some RAMPS and other boards don't detect when an SD card is inserted. You can work
+  // around this by connecting a push button or single throw switch to the pin defined
+  // as SD_DETECT_PIN in your board's pins definitions.
+  // This setting should be disabled unless you are using a push button, pulling the pin to ground.
+  // Note: This is always disabled for ULTIPANEL (except ELB_FULL_GRAPHIC_CONTROLLER).
+  #define SD_DETECT_INVERTED
 
   #define SD_FINISHED_STEPPERRELEASE true  //if sd support and the file is finished: disable steppers?
   #define SD_FINISHED_RELEASECOMMAND "M84 X Y Z E" // You might want to keep the z enabled so your bed stays in place.

Marlin/cardreader.h

 
 #define IS_SD_PRINTING (card.sdprinting)
 
-#if PIN_EXISTS(SDCARDDETECT)
-  #if ENABLED(SDCARDDETECTINVERTED)
-    #define IS_SD_INSERTED (READ(SDCARDDETECT_PIN) != 0)
+#if PIN_EXISTS(SD_DETECT)
+  #if ENABLED(SD_DETECT_INVERTED)
+    #define IS_SD_INSERTED (READ(SD_DETECT_PIN) != 0)
   #else
-    #define IS_SD_INSERTED (READ(SDCARDDETECT_PIN) == 0)
+    #define IS_SD_INSERTED (READ(SD_DETECT_PIN) == 0)
   #endif
 #else
   //No card detect line? Assume the card is inserted.

Marlin/configurator/config/Configuration.h

 //
 // ==> REMEMBER TO INSTALL U8glib to your ARDUINO library folder: http://code.google.com/p/u8glib/wiki/u8glib
 //#define ELB_FULL_GRAPHIC_CONTROLLER
-//#define SDCARDDETECTINVERTED
+//#define SD_DETECT_INVERTED
 
 // The RepRapDiscount Smart Controller (white PCB)
 // http://reprap.org/wiki/RepRapDiscount_Smart_Controller

Marlin/configurator/config/Configuration_adv.h

 
 #if ENABLED(SDSUPPORT)
 
-  // If you are using a RAMPS board or cheap E-bay purchased boards that do not detect when an SD card is inserted
-  // You can get round this by connecting a push button or single throw switch to the pin defined as SDCARDCARDDETECT
-  // in the pins.h file.  When using a push button pulling the pin to ground this will need inverted.  This setting should
-  // be commented out otherwise
-  #ifndef ELB_FULL_GRAPHIC_CONTROLLER
-    #define SDCARDDETECTINVERTED
-  #endif
+  // Some RAMPS and other boards don't detect when an SD card is inserted. You can work
+  // around this by connecting a push button or single throw switch to the pin defined
+  // as SD_DETECT_PIN in your board's pins definitions.
+  // This setting should be disabled unless you are using a push button, pulling the pin to ground.
+  // Note: This is always disabled for ULTIPANEL (except ELB_FULL_GRAPHIC_CONTROLLER).
+  #define SD_DETECT_INVERTED
 
   #define SD_FINISHED_STEPPERRELEASE true  //if sd support and the file is finished: disable steppers?
   #define SD_FINISHED_RELEASECOMMAND "M84 X Y Z E" // You might want to keep the z enabled so your bed stays in place.

Marlin/example_configurations/Felix/Configuration.h

 //
 // ==> REMEMBER TO INSTALL U8glib to your ARDUINO library folder: http://code.google.com/p/u8glib/wiki/u8glib
 //#define ELB_FULL_GRAPHIC_CONTROLLER
-//#define SDCARDDETECTINVERTED
+//#define SD_DETECT_INVERTED
 
 // The RepRapDiscount Smart Controller (white PCB)
 // http://reprap.org/wiki/RepRapDiscount_Smart_Controller

Marlin/example_configurations/Felix/Configuration_DUAL.h

 //
 // ==> REMEMBER TO INSTALL U8glib to your ARDUINO library folder: http://code.google.com/p/u8glib/wiki/u8glib
 //#define ELB_FULL_GRAPHIC_CONTROLLER
-//#define SDCARDDETECTINVERTED
+//#define SD_DETECT_INVERTED
 
 // The RepRapDiscount Smart Controller (white PCB)
 // http://reprap.org/wiki/RepRapDiscount_Smart_Controller

Marlin/example_configurations/Felix/Configuration_adv.h

 
 #if ENABLED(SDSUPPORT)
 
-  // If you are using a RAMPS board or cheap E-bay purchased boards that do not detect when an SD card is inserted
-  // You can get round this by connecting a push button or single throw switch to the pin defined as SDCARDCARDDETECT
-  // in the pins.h file.  When using a push button pulling the pin to ground this will need inverted.  This setting should
-  // be commented out otherwise
-  #define SDCARDDETECTINVERTED
+  // Some RAMPS and other boards don't detect when an SD card is inserted. You can work
+  // around this by connecting a push button or single throw switch to the pin defined
+  // as SD_DETECT_PIN in your board's pins definitions.
+  // This setting should be disabled unless you are using a push button, pulling the pin to ground.
+  // Note: This is always disabled for ULTIPANEL (except ELB_FULL_GRAPHIC_CONTROLLER).
+  #define SD_DETECT_INVERTED
 
   #define SD_FINISHED_STEPPERRELEASE true  //if sd support and the file is finished: disable steppers?
   #define SD_FINISHED_RELEASECOMMAND "M84 X Y Z E" // You might want to keep the z enabled so your bed stays in place.

Marlin/example_configurations/Hephestos/Configuration.h

 //
 // ==> REMEMBER TO INSTALL U8glib to your ARDUINO library folder: http://code.google.com/p/u8glib/wiki/u8glib
 //#define ELB_FULL_GRAPHIC_CONTROLLER
-//#define SDCARDDETECTINVERTED
+//#define SD_DETECT_INVERTED
 
 // The RepRapDiscount Smart Controller (white PCB)
 // http://reprap.org/wiki/RepRapDiscount_Smart_Controller

Marlin/example_configurations/Hephestos/Configuration_adv.h

 
 #if ENABLED(SDSUPPORT)
 
-  // If you are using a RAMPS board or cheap E-bay purchased boards that do not detect when an SD card is inserted
-  // You can get round this by connecting a push button or single throw switch to the pin defined as SDCARDCARDDETECT
-  // in the pins.h file.  When using a push button pulling the pin to ground this will need inverted.  This setting should
-  // be commented out otherwise
-  #define SDCARDDETECTINVERTED
+  // Some RAMPS and other boards don't detect when an SD card is inserted. You can work
+  // around this by connecting a push button or single throw switch to the pin defined
+  // as SD_DETECT_PIN in your board's pins definitions.
+  // This setting should be disabled unless you are using a push button, pulling the pin to ground.
+  // Note: This is always disabled for ULTIPANEL (except ELB_FULL_GRAPHIC_CONTROLLER).
+  #define SD_DETECT_INVERTED
 
   #define SD_FINISHED_STEPPERRELEASE true  //if sd support and the file is finished: disable steppers?
   #define SD_FINISHED_RELEASECOMMAND "M84 X Y Z E" // You might want to keep the z enabled so your bed stays in place.

Marlin/example_configurations/K8200/Configuration.h

 //
 // ==> REMEMBER TO INSTALL U8glib to your ARDUINO library folder: http://code.google.com/p/u8glib/wiki/u8glib
 //#define ELB_FULL_GRAPHIC_CONTROLLER
-//#define SDCARDDETECTINVERTED
+//#define SD_DETECT_INVERTED
 
 // The RepRapDiscount Smart Controller (white PCB)
 // http://reprap.org/wiki/RepRapDiscount_Smart_Controller

Marlin/example_configurations/K8200/Configuration_adv.h

 
 #if ENABLED(SDSUPPORT)
 
-  // If you are using a RAMPS board or cheap E-bay purchased boards that do not detect when an SD card is inserted
-  // You can get round this by connecting a push button or single throw switch to the pin defined as SDCARDCARDDETECT
-  // in the pins.h file.  When using a push button pulling the pin to ground this will need inverted.  This setting should
-  // be commented out otherwise
-  #define SDCARDDETECTINVERTED
+  // Some RAMPS and other boards don't detect when an SD card is inserted. You can work
+  // around this by connecting a push button or single throw switch to the pin defined
+  // as SD_DETECT_PIN in your board's pins definitions.
+  // This setting should be disabled unless you are using a push button, pulling the pin to ground.
+  // Note: This is always disabled for ULTIPANEL (except ELB_FULL_GRAPHIC_CONTROLLER).
+  #define SD_DETECT_INVERTED
 
   #define SD_FINISHED_STEPPERRELEASE true  //if sd support and the file is finished: disable steppers?
   #define SD_FINISHED_RELEASECOMMAND "M84 X Y Z E" // You might want to keep the z enabled so your bed stays in place.

Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h

 //
 // ==> REMEMBER TO INSTALL U8glib to your ARDUINO library folder: http://code.google.com/p/u8glib/wiki/u8glib
 //#define ELB_FULL_GRAPHIC_CONTROLLER
-//#define SDCARDDETECTINVERTED
+//#define SD_DETECT_INVERTED
 
 // The RepRapDiscount Smart Controller (white PCB)
 // http://reprap.org/wiki/RepRapDiscount_Smart_Controller

Marlin/example_configurations/RigidBot/Configuration.h

 //
 // ==> REMEMBER TO INSTALL U8glib to your ARDUINO library folder: http://code.google.com/p/u8glib/wiki/u8glib
 //#define ELB_FULL_GRAPHIC_CONTROLLER
-//#define SDCARDDETECTINVERTED
+//#define SD_DETECT_INVERTED
 
 // The RepRapDiscount Smart Controller (white PCB)
 // http://reprap.org/wiki/RepRapDiscount_Smart_Controller

Marlin/example_configurations/RigidBot/Configuration_adv.h

 #if ENABLED(SDSUPPORT)
 
   // If you are using a RAMPS board or cheap E-bay purchased boards that do not detect when an SD card is inserted
-  // You can get round this by connecting a push button or single throw switch to the pin defined as SDCARDCARDDETECT
+  // You can get round this by connecting a push button or single throw switch to the pin defined as SD_DETECT_PIN
   // in the pins.h file.  When using a push button pulling the pin to ground this will need inverted.  This setting should
   // be commented out otherwise
   #ifndef ELB_FULL_GRAPHIC_CONTROLLER
-    #define SDCARDDETECTINVERTED
+    #define SD_DETECT_INVERTED
   #endif
 
   #define SD_FINISHED_STEPPERRELEASE true  //if sd support and the file is finished: disable steppers?

Marlin/example_configurations/SCARA/Configuration.h

 //
 // ==> REMEMBER TO INSTALL U8glib to your ARDUINO library folder: http://code.google.com/p/u8glib/wiki/u8glib
 //#define ELB_FULL_GRAPHIC_CONTROLLER
-//#define SDCARDDETECTINVERTED
+//#define SD_DETECT_INVERTED
 
 // The RepRapDiscount Smart Controller (white PCB)
 // http://reprap.org/wiki/RepRapDiscount_Smart_Controller

Marlin/example_configurations/SCARA/Configuration_adv.h

 
 #if ENABLED(SDSUPPORT)
 
-  // If you are using a RAMPS board or cheap E-bay purchased boards that do not detect when an SD card is inserted
-  // You can get round this by connecting a push button or single throw switch to the pin defined as SDCARDCARDDETECT
-  // in the pins.h file.  When using a push button pulling the pin to ground this will need inverted.  This setting should
-  // be commented out otherwise
-  #define SDCARDDETECTINVERTED
+  // Some RAMPS and other boards don't detect when an SD card is inserted. You can work
+  // around this by connecting a push button or single throw switch to the pin defined
+  // as SD_DETECT_PIN in your board's pins definitions.
+  // This setting should be disabled unless you are using a push button, pulling the pin to ground.
+  // Note: This is always disabled for ULTIPANEL (except ELB_FULL_GRAPHIC_CONTROLLER).
+  #define SD_DETECT_INVERTED
 
   #define SD_FINISHED_STEPPERRELEASE true  //if sd support and the file is finished: disable steppers?
   #define SD_FINISHED_RELEASECOMMAND "M84 X Y Z E" // You might want to keep the z enabled so your bed stays in place.

Marlin/example_configurations/WITBOX/Configuration.h

 //
 // ==> REMEMBER TO INSTALL U8glib to your ARDUINO library folder: http://code.google.com/p/u8glib/wiki/u8glib
 //#define ELB_FULL_GRAPHIC_CONTROLLER
-//#define SDCARDDETECTINVERTED
+//#define SD_DETECT_INVERTED
 
 // The RepRapDiscount Smart Controller (white PCB)
 // http://reprap.org/wiki/RepRapDiscount_Smart_Controller

Marlin/example_configurations/WITBOX/Configuration_adv.h

 
 #if ENABLED(SDSUPPORT)
 
-  // If you are using a RAMPS board or cheap E-bay purchased boards that do not detect when an SD card is inserted
-  // You can get round this by connecting a push button or single throw switch to the pin defined as SDCARDCARDDETECT
-  // in the pins.h file.  When using a push button pulling the pin to ground this will need inverted.  This setting should
-  // be commented out otherwise
-  #define SDCARDDETECTINVERTED
+  // Some RAMPS and other boards don't detect when an SD card is inserted. You can work
+  // around this by connecting a push button or single throw switch to the pin defined
+  // as SD_DETECT_PIN in your board's pins definitions.
+  // This setting should be disabled unless you are using a push button, pulling the pin to ground.
+  // Note: This is always disabled for ULTIPANEL (except ELB_FULL_GRAPHIC_CONTROLLER).
+  #define SD_DETECT_INVERTED
 
   #define SD_FINISHED_STEPPERRELEASE true  //if sd support and the file is finished: disable steppers?
   #define SD_FINISHED_RELEASECOMMAND "M84 X Y Z E" // You might want to keep the z enabled so your bed stays in place.

Marlin/example_configurations/adafruit/ST7565/Configuration.h

 //
 // ==> REMEMBER TO INSTALL U8glib to your ARDUINO library folder: http://code.google.com/p/u8glib/wiki/u8glib
 #define ELB_FULL_GRAPHIC_CONTROLLER
-//#define SDCARDDETECTINVERTED
+//#define SD_DETECT_INVERTED
 
 // The RepRapDiscount Smart Controller (white PCB)
 // http://reprap.org/wiki/RepRapDiscount_Smart_Controller

Marlin/example_configurations/delta/biv2.5/Configuration.h

 //
 // ==> REMEMBER TO INSTALL U8glib to your ARDUINO library folder: http://code.google.com/p/u8glib/wiki/u8glib
 //#define ELB_FULL_GRAPHIC_CONTROLLER
-//#define SDCARDDETECTINVERTED
+//#define SD_DETECT_INVERTED
 
 // The RepRapDiscount Smart Controller (white PCB)
 // http://reprap.org/wiki/RepRapDiscount_Smart_Controller

Marlin/example_configurations/delta/biv2.5/Configuration_adv.h

 
 #if ENABLED(SDSUPPORT)
 
-  // If you are using a RAMPS board or cheap E-bay purchased boards that do not detect when an SD card is inserted
-  // You can get round this by connecting a push button or single throw switch to the pin defined as SDCARDCARDDETECT
-  // in the pins.h file.  When using a push button pulling the pin to ground this will need inverted.  This setting should
-  // be commented out otherwise
-  #define SDCARDDETECTINVERTED
+  // Some RAMPS and other boards don't detect when an SD card is inserted. You can work
+  // around this by connecting a push button or single throw switch to the pin defined
+  // as SD_DETECT_PIN in your board's pins definitions.
+  // This setting should be disabled unless you are using a push button, pulling the pin to ground.
+  // Note: This is always disabled for ULTIPANEL (except ELB_FULL_GRAPHIC_CONTROLLER).
+  #define SD_DETECT_INVERTED
 
   #define SD_FINISHED_STEPPERRELEASE true  //if sd support and the file is finished: disable steppers?
   #define SD_FINISHED_RELEASECOMMAND "M84 X Y Z E" // You might want to keep the z enabled so your bed stays in place.

Marlin/example_configurations/delta/generic/Configuration.h

 //
 // ==> REMEMBER TO INSTALL U8glib to your ARDUINO library folder: http://code.google.com/p/u8glib/wiki/u8glib
 //#define ELB_FULL_GRAPHIC_CONTROLLER
-//#define SDCARDDETECTINVERTED
+//#define SD_DETECT_INVERTED
 
 // The RepRapDiscount Smart Controller (white PCB)
 // http://reprap.org/wiki/RepRapDiscount_Smart_Controller

Marlin/example_configurations/delta/generic/Configuration_adv.h

 
 #if ENABLED(SDSUPPORT)
 
-  // If you are using a RAMPS board or cheap E-bay purchased boards that do not detect when an SD card is inserted
-  // You can get round this by connecting a push button or single throw switch to the pin defined as SDCARDCARDDETECT
-  // in the pins.h file.  When using a push button pulling the pin to ground this will need inverted.  This setting should
-  // be commented out otherwise
-  #define SDCARDDETECTINVERTED
+  // Some RAMPS and other boards don't detect when an SD card is inserted. You can work
+  // around this by connecting a push button or single throw switch to the pin defined
+  // as SD_DETECT_PIN in your board's pins definitions.
+  // This setting should be disabled unless you are using a push button, pulling the pin to ground.
+  // Note: This is always disabled for ULTIPANEL (except ELB_FULL_GRAPHIC_CONTROLLER).
+  #define SD_DETECT_INVERTED
 
   #define SD_FINISHED_STEPPERRELEASE true  //if sd support and the file is finished: disable steppers?
   #define SD_FINISHED_RELEASECOMMAND "M84 X Y Z E" // You might want to keep the z enabled so your bed stays in place.

Marlin/example_configurations/delta/kossel_mini/Configuration.h

 //
 // ==> REMEMBER TO INSTALL U8glib to your ARDUINO library folder: http://code.google.com/p/u8glib/wiki/u8glib
 //#define ELB_FULL_GRAPHIC_CONTROLLER
-//#define SDCARDDETECTINVERTED
+//#define SD_DETECT_INVERTED
 
 // The RepRapDiscount Smart Controller (white PCB)
 // http://reprap.org/wiki/RepRapDiscount_Smart_Controller

Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h

 
 #if ENABLED(SDSUPPORT)
 
-  // If you are using a RAMPS board or cheap E-bay purchased boards that do not detect when an SD card is inserted
-  // You can get round this by connecting a push button or single throw switch to the pin defined as SDCARDCARDDETECT
-  // in the pins.h file.  When using a push button pulling the pin to ground this will need inverted.  This setting should
-  // be commented out otherwise
-  #define SDCARDDETECTINVERTED
+  // Some RAMPS and other boards don't detect when an SD card is inserted. You can work
+  // around this by connecting a push button or single throw switch to the pin defined
+  // as SD_DETECT_PIN in your board's pins definitions.
+  // This setting should be disabled unless you are using a push button, pulling the pin to ground.
+  // Note: This is always disabled for ULTIPANEL (except ELB_FULL_GRAPHIC_CONTROLLER).
+  #define SD_DETECT_INVERTED
 
   #define SD_FINISHED_STEPPERRELEASE true  //if sd support and the file is finished: disable steppers?
   #define SD_FINISHED_RELEASECOMMAND "M84 X Y Z E" // You might want to keep the z enabled so your bed stays in place.

Marlin/example_configurations/delta/kossel_pro/Configuration.h

 //
 // ==> REMEMBER TO INSTALL U8glib to your ARDUINO library folder: http://code.google.com/p/u8glib/wiki/u8glib
 //#define ELB_FULL_GRAPHIC_CONTROLLER
-//#define SDCARDDETECTINVERTED
+//#define SD_DETECT_INVERTED
 
 // The RepRapDiscount Smart Controller (white PCB)
 // http://reprap.org/wiki/RepRapDiscount_Smart_Controller

Marlin/example_configurations/delta/kossel_pro/Configuration_adv.h

 
 #if ENABLED(SDSUPPORT)
 
-  // If you are using a RAMPS board or cheap E-bay purchased boards that do not detect when an SD card is inserted
-  // You can get round this by connecting a push button or single throw switch to the pin defined as SDCARDCARDDETECT
-  // in the pins.h file.  When using a push button pulling the pin to ground this will need inverted.  This setting should
-  // be commented out otherwise
-  #define SDCARDDETECTINVERTED
+  // Some RAMPS and other boards don't detect when an SD card is inserted. You can work
+  // around this by connecting a push button or single throw switch to the pin defined
+  // as SD_DETECT_PIN in your board's pins definitions.
+  // This setting should be disabled unless you are using a push button, pulling the pin to ground.
+  // Note: This is always disabled for ULTIPANEL (except ELB_FULL_GRAPHIC_CONTROLLER).
+  #define SD_DETECT_INVERTED
 
   #define SD_FINISHED_STEPPERRELEASE true  //if sd support and the file is finished: disable steppers?
   #define SD_FINISHED_RELEASECOMMAND "M84 X Y Z E" // You might want to keep the z enabled so your bed stays in place.
 const unsigned int dropsegments=5; //everything with less than this number of steps will be ignored as move and joined with the next movement
 
 #if ENABLED(ULTIPANEL)
- #undef SDCARDDETECTINVERTED
+ #undef SD_DETECT_INVERTED
 #endif
 
 // Power Signal Control Definitions

Marlin/example_configurations/makibox/Configuration.h

 //
 // ==> REMEMBER TO INSTALL U8glib to your ARDUINO library folder: http://code.google.com/p/u8glib/wiki/u8glib
 //#define ELB_FULL_GRAPHIC_CONTROLLER
-//#define SDCARDDETECTINVERTED
+//#define SD_DETECT_INVERTED
 
 // The RepRapDiscount Smart Controller (white PCB)
 // http://reprap.org/wiki/RepRapDiscount_Smart_Controller

Marlin/example_configurations/makibox/Configuration_adv.h

 #if ENABLED(SDSUPPORT)
 
   // If you are using a RAMPS board or cheap E-bay purchased boards that do not detect when an SD card is inserted
-  // You can get round this by connecting a push button or single throw switch to the pin defined as SDCARDCARDDETECT
+  // You can get round this by connecting a push button or single throw switch to the pin defined as SD_DETECT_PIN
   // in the pins.h file.  When using a push button pulling the pin to ground this will need inverted.  This setting should
   // be commented out otherwise
-  //#define SDCARDDETECTINVERTED
+  //#define SD_DETECT_INVERTED
 
   #define SD_FINISHED_STEPPERRELEASE true  //if sd support and the file is finished: disable steppers?
   #define SD_FINISHED_RELEASECOMMAND "M84 X Y Z E" // You might want to keep the z enabled so your bed stays in place.

Marlin/example_configurations/tvrrug/Round2/Configuration.h

 //
 // ==> REMEMBER TO INSTALL U8glib to your ARDUINO library folder: http://code.google.com/p/u8glib/wiki/u8glib
 //#define ELB_FULL_GRAPHIC_CONTROLLER
-//#define SDCARDDETECTINVERTED
+//#define SD_DETECT_INVERTED
 
 // The RepRapDiscount Smart Controller (white PCB)
 // http://reprap.org/wiki/RepRapDiscount_Smart_Controller

Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h

 
 #if ENABLED(SDSUPPORT)
 
-  // If you are using a RAMPS board or cheap E-bay purchased boards that do not detect when an SD card is inserted
-  // You can get round this by connecting a push button or single throw switch to the pin defined as SDCARDCARDDETECT
-  // in the pins.h file.  When using a push button pulling the pin to ground this will need inverted.  This setting should
-  // be commented out otherwise
-  #define SDCARDDETECTINVERTED
+  // Some RAMPS and other boards don't detect when an SD card is inserted. You can work
+  // around this by connecting a push button or single throw switch to the pin defined
+  // as SD_DETECT_PIN in your board's pins definitions.
+  // This setting should be disabled unless you are using a push button, pulling the pin to ground.
+  // Note: This is always disabled for ULTIPANEL (except ELB_FULL_GRAPHIC_CONTROLLER).
+  #define SD_DETECT_INVERTED
 
   #define SD_FINISHED_STEPPERRELEASE true  //if sd support and the file is finished: disable steppers?
   #define SD_FINISHED_RELEASECOMMAND "M84 X Y Z E" // You might want to keep the z enabled so your bed stays in place.

Marlin/pins_AZTEEG_X3.h

   #define BTN_ENC           12  //the click switch
 
   #define SDSS              53
-  #define SDCARDDETECT      -1  // Pin 49 if using display sd interface
+  #define SD_DETECT         -1  // Pin 49 if using display sd interface
 
   #if ENABLED(TEMP_STAT_LEDS)
     #define STAT_LED_RED    64

Marlin/pins_AZTEEG_X3_PRO.h

   #define BTN_ENC          39  //the click switch
  
   #define SDSS             53
-  #define SDCARDDETECT_PIN 49
+  #define SD_DETECT_PIN 49
   
   #define KILL_PIN         31
  #endif

Marlin/pins_BRAINWAVE_PRO.h

 #define PS_ON_PIN          -1
 #define KILL_PIN           -1
 #define ALARM_PIN          -1
-#define SDCARDDETECT_PIN   12
+#define SD_DETECT_PIN      12
 
 #if DISABLED(SDSUPPORT)
 // these pins are defined in the SD library if building with SD support

Marlin/pins_CHEAPTRONIC.h

 #define BLEN_A 0
 
 // Cheaptronic v1.0 doesn't use this
-#define SDCARDDETECT_PIN -1
+#define SD_DETECT_PIN -1

Marlin/pins_ELEFU_3.h

 #if ENABLED(RA_CONTROL_PANEL)
 
   #define SDSS             53
-  #define SDCARDDETECT_PIN 28
+  #define SD_DETECT_PIN    28
 
   #define BTN_EN1          14
   #define BTN_EN2          39

Marlin/pins_FELIX2.h

   #define BLEN_C 2
   #define BLEN_B 1
   #define BLEN_A 0
-  #define SDCARDDETECT_PIN 6
+  #define SD_DETECT_PIN 6
 
 #endif // NEWPANEL && ULTRA_LCD

Marlin/pins_GEN7_CUSTOM.h

 //#define RX_ENABLE_PIN       13
 
 #define BEEPER_PIN -1
-#define SDCARDDETECT_PIN -1
+#define SD_DETECT_PIN -1
 #define SUICIDE_PIN -1    //has to be defined; otherwise Power_off doesn't work
 
 #define KILL_PIN -1

Marlin/pins_LEAPFROG.h

 
 #define SDPOWER            -1
 #define SDSS               11
-#define SDCARDDETECT_PIN   -1 // 10 optional also used as mode pin
+#define SD_DETECT_PIN      -1 // 10 optional also used as mode pin
 #define LED_PIN            13
 #define FAN_PIN            7
 #define PS_ON_PIN          -1

Marlin/pins_MEGACONTROLLER.h

     #define BTN_EN2 11
     #define BTN_ENC 10  //the click switch
     //not connected to a pin
-    #define SDCARDDETECT_PIN 49
+    #define SD_DETECT_PIN 49
 #endif //Minipanel
 

Marlin/pins_MEGATRONICS.h

   #define BLEN_B           1
   #define BLEN_A           0
 
-  #define SDCARDDETECT_PIN -1   // RAMPS doesn't use this
+  #define SD_DETECT_PIN   -1   // RAMPS doesn't use this
 
 #endif // ULTRA_LCD && NEWPANEL

Marlin/pins_MEGATRONICS_2.h

 #define BLEN_B 1
 #define BLEN_A 0
 
-#define SDCARDDETECT_PIN -1  // Megatronics doesn't use this
+#define SD_DETECT_PIN -1  // Megatronics doesn't use this

Marlin/pins_MEGATRONICS_3.h

 #define BLEN_B 1
 #define BLEN_A 0
 
-#define SDCARDDETECT_PIN -1	// Megatronics doesn't use this
+#define SD_DETECT_PIN -1	// Megatronics doesn't use this

Marlin/pins_MINIRAMBO.h

     #define BTN_EN2         72
     #define BTN_ENC          9  // the click
 
-    #define SDCARDDETECT_PIN 15
+    #define SD_DETECT_PIN   15
 
   #endif //NEWPANEL
 #endif //ULTRA_LCD

Marlin/pins_MINITRONICS.h

 #define BLEN_B 1
 #define BLEN_A 0
 
-#define SDCARDDETECT_PIN -1  // Minitronics doesn't use this
+#define SD_DETECT_PIN -1  // Minitronics doesn't use this

Marlin/pins_OMCA.h

 
 #define SDPOWER            -1
 #define SDSS               11
-#define SDCARDDETECT_PIN   -1 // 10 optional also used as mode pin
+#define SD_DETECT_PIN      -1 // 10 optional also used as mode pin
 #define LED_PIN            -1
 #define FAN_PIN            14 // PWM on MIDDLE connector
 #define PS_ON_PIN          -1

Marlin/pins_OMCA_A.h

 
 #define SDPOWER            -1
 #define SDSS               11
-#define SDCARDDETECT_PIN   -1 // 10 optional also used as mode pin
+#define SD_DETECT_PIN      -1 // 10 optional also used as mode pin
 #define LED_PIN            -1
 #define FAN_PIN            3
 #define PS_ON_PIN          -1

Marlin/pins_PRINTRBOARD.h

     #define SDSS   40 //use SD card on Panelolu2 (Teensyduino pin mapping)
   #endif // LCD_I2C_PANELOLU2
   //not connected to a pin
-  #define SDCARDDETECT_PIN -1    
+  #define SD_DETECT_PIN -1    
 #endif // ULTRA_LCD && NEWPANEL
 
 #if ENABLED(VIKI2) || ENABLED(miniVIKI)
  #define BTN_ENC 47  //the click switch
 
  #define SDSS 45
- #define SDCARDDETECT_PIN -1 // FastIO (Manual says 72 I'm not certain cause I can't test) 
+ #define SD_DETECT_PIN -1 // FastIO (Manual says 72 I'm not certain cause I can't test) 
 
  #if ENABLED(TEMP_STAT_LEDS)
   #define STAT_LED_RED      12 //Non-FastIO

Marlin/pins_RAMBO.h

     #define BLEN_B 1
     #define BLEN_A 0
 
-    #define SDCARDDETECT_PIN 81 // Ramps doesn't use this
+    #define SD_DETECT_PIN 81 // Ramps doesn't use this
 
   #else //!NEWPANEL - old style panel with shift register
 
  #define BTN_EN2 84
  #define BTN_ENC 83  //the click switch
 
- #define SDCARDDETECT_PIN -1 // Pin 72 if using easy adapter board   
+ #define SD_DETECT_PIN -1 // Pin 72 if using easy adapter board   
 
   #if ENABLED(TEMP_STAT_LEDS)
    #define STAT_LED_RED      22

Marlin/pins_RAMPS_13.h

       #define BTN_EN2 33
       #define BTN_ENC 35
 
-      #define SDCARDDETECT_PIN 49
+      #define SD_DETECT_PIN 49
     #elif ENABLED(LCD_I2C_PANELOLU2)
       #define BTN_EN1 47  // reverse if the encoder turns the wrong way.
       #define BTN_EN2 43
       #define BTN_ENC 32
       #define LCD_SDSS 53
-      #define SDCARDDETECT_PIN -1
+      #define SD_DETECT_PIN -1
       #define KILL_PIN 41
     #elif ENABLED(LCD_I2C_VIKI)
       #define BTN_EN1 22  // reverse if the encoder turns the wrong way.
       #define BTN_EN2 7
       #define BTN_ENC -1
       #define LCD_SDSS 53
-      #define SDCARDDETECT_PIN 49
+      #define SD_DETECT_PIN 49
     #elif ENABLED(ELB_FULL_GRAPHIC_CONTROLLER)
       #define BTN_EN1 35  // reverse if the encoder turns the wrong way.
       #define BTN_EN2 37
       #define BTN_ENC 31
-      #define SDCARDDETECT_PIN 49
+      #define SD_DETECT_PIN 49
       #define LCD_SDSS 53
       #define KILL_PIN 41
       #define BEEPER_PIN 23
        #define BTN_EN2 63
        #define BTN_ENC 59  //the click switch
        //not connected to a pin
-       #define SDCARDDETECT_PIN 49
+       #define SD_DETECT_PIN 49
 
     #else
 
       #endif
 
       #if ENABLED(G3D_PANEL)
-        #define SDCARDDETECT_PIN 49
+        #define SD_DETECT_PIN 49
       #else
-        #define SDCARDDETECT_PIN -1  // Ramps doesn't use this
+        #define SD_DETECT_PIN -1  // Ramps doesn't use this
       #endif
 
     #endif

Marlin/pins_RIGIDBOARD.h

   #undef BEEPER_PIN
   #define BEEPER_PIN -1
 
-  #undef SDCARDDETECT_PIN
-  #define SDCARDDETECT_PIN 22
+  #undef SD_DETECT_PIN
+  #define SD_DETECT_PIN 22
 
   // Extra button definitions, substitute for EN1 / EN2
   #define BTN_UP  37 // BTN_EN1
   #undef  BTN_ENC
   #define BTN_ENC 31
 
-  #undef  SDCARDDETECT_PIN
-  #define SDCARDDETECT_PIN 22
+  #undef  SD_DETECT_PIN
+  #define SD_DETECT_PIN 22
 
 #elif defined(REPRAP_DISCOUNT_SMART_CONTROLLER)
 
   #undef BEEPER_PIN
   #define BEEPER_PIN -1
 
-  #undef  SDCARDDETECT_PIN
-  #define SDCARDDETECT_PIN 22
+  #undef  SD_DETECT_PIN
+  #define SD_DETECT_PIN 22
 
   #undef  KILL_PIN
   #define KILL_PIN 32

Marlin/pins_RUMBA.h

 
 #define SDPOWER            -1
 #define SDSS               53
-#define SDCARDDETECT_PIN   49
+#define SD_DETECT_PIN      49
 #define BEEPER_PIN         44
 #define LCD_PINS_RS        19
 #define LCD_PINS_ENABLE    42

Marlin/pins_SANGUINOLOLU_11.h

     #define LCD_SDSS            28 // Smart Controller SD card reader rather than the Melzi
   #endif //Panelolu2
 
-  #define SDCARDDETECT_PIN      -1
+  #define SD_DETECT_PIN         -1
 
 #elif ENABLED(MAKRPANEL)
 
   #define BTN_EN2               10
   #define BTN_ENC               16
 
-  #define SDCARDDETECT_PIN      -1
+  #define SD_DETECT_PIN         -1
 
 #endif // MAKRPANEL
 

Marlin/pins_SAV_MKI.h

 #define LED_PIN            -1
 #define PS_ON_PIN          -1
 #define ALARM_PIN          -1
-#define SDCARDDETECT_PIN   -1
+#define SD_DETECT_PIN      -1
 
 #define BEEPER_PIN         -1
 #define LCD_PINS_RS        -1

Marlin/pins_TEENSY2.h

 #define TEMP_2_PIN         -1
 
 #define SDPOWER            -1
-#define SDCARDDETECT_PIN   -1   
+#define SD_DETECT_PIN      -1   
 #define SDSS               20 // 8
 #define LED_PIN             6
 #define PS_ON_PIN          27

Marlin/pins_TEENSYLU.h

     #define SDSS           40  //use SD card on Panelolu2 (Teensyduino pin mapping)
   #endif // LCD_I2C_PANELOLU2
 
-  #define SDCARDDETECT_PIN -1    
+  #define SD_DETECT_PIN    -1    
 
 #endif // ULTRA_LCD && NEWPANEL
 

Marlin/pins_ULTIMAIN_2.h

 #define BLEN_B 1
 #define BLEN_A 0
 
-#define SDCARDDETECT_PIN 39
+#define SD_DETECT_PIN 39

Marlin/pins_ULTIMAKER.h

     #define BTN_EN2 42
     #define BTN_ENC 19
 
-    #define SDCARDDETECT_PIN 38
+    #define SD_DETECT_PIN 38
 
   #else //!NEWPANEL - Old style panel with shift register
 
     #define LCD_PINS_D6 20
     #define LCD_PINS_D7 19
 
-    #define SDCARDDETECT_PIN -1
+    #define SD_DETECT_PIN -1
 
   #endif // !NEWPANEL
 

Marlin/ultralcd.cpp

   millis_t next_button_update_ms;
   uint8_t lastEncoderBits;
   uint32_t encoderPosition;
-  #if PIN_EXISTS(SDCARDDETECT)
+  #if PIN_EXISTS(SD_DETECT)
     bool lcd_oldcardstatus;
   #endif
 
       }
       else {
         MENU_ITEM(submenu, MSG_CARD_MENU, lcd_sdcard_menu);
-        #if !PIN_EXISTS(SDCARDDETECT)
+        #if !PIN_EXISTS(SD_DETECT)
           MENU_ITEM(gcode, MSG_CNG_SDCARD, PSTR("M21"));  // SD-card changed by user
         #endif
       }
     }
     else {
       MENU_ITEM(submenu, MSG_NO_CARD, lcd_sdcard_menu);
-      #if !PIN_EXISTS(SDCARDDETECT)
+      #if !PIN_EXISTS(SD_DETECT)
         MENU_ITEM(gcode, MSG_INIT_SDCARD, PSTR("M21")); // Manually initialize the SD-card via user interface
       #endif
     }
   }
 #endif // FWRETRACT
 
-#if !PIN_EXISTS(SDCARDDETECT)
+#if !PIN_EXISTS(SD_DETECT)
   static void lcd_sd_refresh() {
     card.initsd();
     currentMenuViewOffset = 0;
   MENU_ITEM(back, MSG_MAIN, lcd_main_menu);
   card.getWorkDirName();
   if (card.filename[0] == '/') {
-    #if !PIN_EXISTS(SDCARDDETECT)
+    #if !PIN_EXISTS(SD_DETECT)
       MENU_ITEM(function, LCD_STR_REFRESH MSG_REFRESH, lcd_sd_refresh);
     #endif
   }
   #endif // SR_LCD_2W_NL
 #endif//!NEWPANEL
 
-  #if ENABLED(SDSUPPORT) && PIN_EXISTS(SDCARDDETECT)
-    pinMode(SDCARDDETECT_PIN, INPUT);
-    WRITE(SDCARDDETECT_PIN, HIGH);
+  #if ENABLED(SDSUPPORT) && PIN_EXISTS(SD_DETECT)
+    pinMode(SD_DETECT_PIN, INPUT);
+    WRITE(SD_DETECT_PIN, HIGH);
     lcd_oldcardstatus = IS_SD_INSERTED;
   #endif
 
 
   lcd_buttons_update();
 
-  #if PIN_EXISTS(SDCARDDETECT)
+  #if PIN_EXISTS(SD_DETECT)
     if (IS_SD_INSERTED != lcd_oldcardstatus && lcd_detected()) {
       lcdDrawUpdate = 2;
       lcd_oldcardstatus = IS_SD_INSERTED;