Changed Configuration_adv.h (issue #9): 
  1. Uncommented define for CASE_LIGHT_ENABLE
  2. Uncommented define for CASE_LIGHT_PIN and changed from 4 to 6
  3. Changed CASE_LIGHT_DEFAULT_ON to false
  4. Changed CASE_LIGHT_DEFAULT_BRIGHTNESS TO 255

File: Marlin\Configuration_adv.h
c482: #define CASE_LIGHT_ENABLE
 483: #if ENABLED(CASE_LIGHT_ENABLE)
c484:   #define CASE_LIGHT_PIN 6                    // Override the default pin if needed
 485:   #define INVERT_CASE_LIGHT false             // Set true if Case Light is ON when pin is LOW
c486:   #define CASE_LIGHT_DEFAULT_ON false         // Set default power-up state on
c487:   #define CASE_LIGHT_DEFAULT_BRIGHTNESS 255   // Set default power-up brightness (0-255, requires PWM pin)
 488:   //#define CASE_LIGHT_MAX_PWM 128            // Limit pwm
 489:   //#define CASE_LIGHT_MENU                   // Add Case Light options to the LCD menu
 490:   //#define CASE_LIGHT_NO_BRIGHTNESS          // Disable brightness control. Enable for non-PWM lighting.
 491:   //#define CASE_LIGHT_USE_NEOPIXEL           // Use NeoPixel LED as case light, requires NEOPIXEL_LED.
 492:   #if ENABLED(CASE_LIGHT_USE_NEOPIXEL)
 493:     #define CASE_LIGHT_NEOPIXEL_COLOR { 255, 255, 255, 255 } // { Red, Green, Blue, White }
 494:   #endif
 495: #endif



Changed caseLight.cpp (issue #9):
1. Added include for touch_lcd.h after #include "caselight.h"; conditional on Creality touch LCD
2. Added a call to caseLightStatus to set screen status; conditional on Creality touch LCD
   (had to add code block)

File: Marlin\src\feature\caselight.cpp
+28: #ifdef DWIN_CREALITY_TOUCHLCD
+29:   #include "../../lcd/dwin/cr6/touch_lcd.h"
+30: #endif

File: Marlin\src\feature\caselight.cpp
 79:     #if DISABLED(CASE_LIGHT_NO_BRIGHTNESS)
 80:       if (PWM_PIN(CASE_LIGHT_PIN))
+81:       {
 82:         analogWrite(pin_t(CASE_LIGHT_PIN), (
 83:           #if CASE_LIGHT_MAX_PWM == 255
 84:             n10ct
 85:           #else
 86:             map(n10ct, 0, 255, 0, CASE_LIGHT_MAX_PWM)
 87:           #endif
 88:         ));
+89:         #ifdef DWIN_CREALITY_TOUCHLCD
+90:           rtscheck.caseLightStatus(on);
+91:         #endif
+92:       }
 93:       else



Changed dwin_touch_lcd.cpp (issue #9):
1. removed call to "OUT_WRITE(LED_CONTROL_PIN, 0)" from DWINTouch_init; this is now controlled by caselight

File: Marlin\src\lcd\dwin\dwin_touch_lcd.cpp
 65: void DWINTouch_init() {
 66:   rtscheck.RTS_Init();
 67: 
 68:   #ifdef FIX_MOUNTED_PROBE
 69:     OUT_WRITE(COM_PIN, 1);
 70:     SET_INPUT(OPTO_SWITCH_PIN);
-71:     OUT_WRITE(LED_CONTROL_PIN, 0);
 72:   #endif
 73: }



Changed pins_CREALITY_V452.h (issue #9):
1. Removed define for LED_CONTROL_PIN as this is now done by caselight

File: Marlin\src\pins\stm32f1\pins_CREALITY_V452.h
-145: #define LED_CONTROL_PIN    PA6



Changed touch_lcd.h (issue #9)
1. Added function prototype for caseLightStatus

File: Marlin\src\lcd\dwin\cr6\touch_lcd.h
 245:     void RTS_FilamentLoaded();
 246: 
+247:     void caseLightStatus(bool on); // nozzle LED
 248: 
 249:     void change_page(DWINTouchPage newPage);
 250:     void refresh_page();




Changed touch_lcd.cpp (issue #9)
1. Added include for caselight.h
2. Removed declaration of LEDStatus; no longer needed with caselight change
3. In RTS_Init switch call to set LED screen title and LEDStatus to call to caseLightStatus
4. In RTS_HandleData change LED toggle to toggle of caselight.on and call to caselight.update
5. In RTS_HandleData for ChangePageKey case change LED status to call to caseLightStatus
6. Added function caseLightStatus to set screen status

File: Marlin\src\lcd\dwin\cr6\touch_lcd.cpp
 48: #include "../../../feature/powerloss.h"
+49: #include "../../../feature/caselight.h"
 50: #include "../../../gcode/gcode.h"
 51: 

File: Marlin\src\lcd\dwin\cr6\touch_lcd.cpp
 113: char FilenamesCount = 0;
 114: 
-115: bool LEDStatus = true;
 116: RTSSHOW rtscheck;

File: Marlin\src\lcd\dwin\cr6\touch_lcd.cpp
 287:   // turn on fans
 288:   RTS_SndData(1, PRINTER_FANOPEN_TITLE_VP);
-289:   RTS_SndData(2, PRINTER_LEDOPEN_TITLE_VP);
-290:   LEDStatus = true;
+289:   // set caselight (nozzle LED) status
+290:   caseLightStatus(caselight.on);

File: Marlin\src\lcd\dwin\cr6\touch_lcd.cpp
-754:         // turn on the LED
-755:         if(LEDStatus)
-756:         {
-757:           RTS_SndData(1, PRINTER_LEDOPEN_TITLE_VP); 
-758:           digitalWrite(LED_CONTROL_PIN, HIGH);
-759:           LEDStatus = false;
-760:         }
-761:         else
-762:         {
-763:           // turn off the LED
-764:           RTS_SndData(2, PRINTER_LEDOPEN_TITLE_VP); 
-765:           digitalWrite(LED_CONTROL_PIN, LOW);
-766:           LEDStatus = true;
-767:         }
+754:         // toggle nozzle LED
+755:         caselight.on = !caselight.on;
+756:         caselight.update(caselight.on ? 1 : 0);

File: Marlin\src\lcd\dwin\cr6\touch_lcd.cpp
-1358:       if(LEDStatus)
-1359:       {
-1360:         RTS_SndData(1, PRINTER_LEDOPEN_TITLE_VP); 
-1361:       }
-1362:       else
-1363:       {
-1364:         RTS_SndData(2, PRINTER_LEDOPEN_TITLE_VP); 
-1365:       }
-1366: 
+1347:       // set nozzle LED status
+1348:       caseLightStatus(caselight.on);
+1349: 

File: Marlin\src\lcd\dwin\cr6\touch_lcd.cpp
+1597: void RTSSHOW::caseLightStatus(bool on) {
+1598:   // set nozzle LED status to on
+1599:   if(on)
+1600:   {
+1601:     RTS_SndData(1, PRINTER_LEDOPEN_TITLE_VP); 
+1602:   }
+1603:   else
+1604:   {
+1605:     // set nozzle LED status to off
+1606:     RTS_SndData(2, PRINTER_LEDOPEN_TITLE_VP); 
+1607:   }
+1608: }
+1609: