Implement GCODE for Hotend LED

[Ranney1]

If changed the Configuration_adv.h in firmware to this:
Than is the case light (M355) supported and working

/**

• M355 Case Light on-off / brightness
  */
  #define CASE_LIGHT_ENABLE
  #if ENABLED(CASE_LIGHT_ENABLE)
  #define CASE_LIGHT_PIN 6 // Override the default pin if needed
  #define INVERT_CASE_LIGHT false // Set true if Case Light is ON when pin is LOW
  #define CASE_LIGHT_DEFAULT_ON false // Set default power-up state on
  #define CASE_LIGHT_DEFAULT_BRIGHTNESS 255 // Set default power-up brightness (0-255, requires PWM pin)
  //#define CASE_LIGHT_MAX_PWM 128 // Limit pwm
  //#define CASE_LIGHT_MENU // Add Case Light options to the LCD menu
  #define CASE_LIGHT_NO_BRIGHTNESS // Disable brightness control. Enable for non-PWM lighting.
  //#define CASE_LIGHT_USE_NEOPIXEL // Use NeoPixel LED as case light, requires NEOPIXEL_LED.
  //#if ENABLED(CASE_LIGHT_USE_NEOPIXEL)
  //#define CASE_LIGHT_NEOPIXEL_COLOR { 255, 255, 255, 255 } // { Red, Green, Blue, White }
  #endif

[ritchiedc]

I have extended this by adding support to update the screen of anyone wants it.

[Ranney1]

I have extended this by adding support to update the screen of anyone wants it.

Ahh, great! Can you tell me how you did this? Thanks!

[ritchiedc]

Attached is a text file detailing the changes I made. It was made before the release today (10/25) so line numbers may be different. I included snippets of code with "c", "+" and "-" in front of lines changed, added or removed. I tried to provide explanations.

Issue 9 changes.txt

Edit: With this method you can also control brightness with M355

[Ranney1]

Ahh, thanks! Looking in to it!

[Sebazzz]

M355 is implemented in extui branch

[Sebazzz]

Ready for next release.