Backlight always on during calibration

Firmware/Marlin_main.cpp

@@ -63,6 +63,7 @@
 
 #include "menu.h"
 #include "ultralcd.h"
+#include "backlight.h"
 
 #include "planner.h"
 #include "stepper.h"
@@ -2768,6 +2769,7 @@ bool gcode_M45(bool onlyZ, int8_t verbosity_level)
 	#ifdef TMC2130
 	FORCE_HIGH_POWER_START;
 	#endif // TMC2130
+	FORCE_BL_ON_START;
 	// Only Z calibration?
 	if (!onlyZ)
 	{
@@ -2956,6 +2958,7 @@ bool gcode_M45(bool onlyZ, int8_t verbosity_level)
 #ifdef TMC2130
 	FORCE_HIGH_POWER_END;
 #endif // TMC2130
+	FORCE_BL_ON_END;
 	return final_result;
 }
 

Firmware/backlight.cpp

@@ -18,6 +18,21 @@ uint8_t backlightMode = BACKLIGHT_MODE_BRIGHT;
 int16_t backlightTimer_period = 10;
 LongTimer backlightTimer;
 
+void force_bl_on(bool section_start)
+{
+    if (section_start)
+    {
+        backlightMode = BACKLIGHT_MODE_BRIGHT;
+        if (backlightLevel_HIGH < 30) backlightLevel_HIGH = 30;
+    }
+    else
+    {
+        backlightMode = eeprom_read_byte((uint8_t *)EEPROM_BACKLIGHT_MODE);
+        backlightLevel_HIGH = eeprom_read_byte((uint8_t *)EEPROM_BACKLIGHT_LEVEL_HIGH);
+    }
+    backlight_update();
+}
+
 void backlight_save() //saves all backlight data to eeprom.
 {
     eeprom_update_byte((uint8_t *)EEPROM_BACKLIGHT_LEVEL_HIGH, (uint8_t)backlightLevel_HIGH);

Firmware/backlight.h

@@ -3,6 +3,8 @@
 #define _BACKLIGHT_H
 
 #include <inttypes.h>
+#include "Marlin.h"
+#include "pins.h"
 
 enum Backlight_Mode
 {
@@ -17,6 +19,14 @@ extern uint8_t backlightMode;
 extern bool backlightSupport;
 extern int16_t backlightTimer_period;
 
+#ifdef LCD_BL_PIN
+    #define FORCE_BL_ON_START   force_bl_on(true)
+    #define FORCE_BL_ON_END	    force_bl_on(false)
+#else
+    #define FORCE_BL_ON_START
+    #define FORCE_BL_ON_END
+#endif
+extern void force_bl_on(bool section_start);
 extern void backlight_update();
 extern void backlight_init();
 extern void backlightTimer_reset();

Firmware/ultralcd.cpp

@@ -5019,7 +5019,7 @@ void lcd_wizard(WizState state)
 	// Make sure EEPROM_WIZARD_ACTIVE is true if entering using different entry point
 	// other than WizState::Run - it is useful for debugging wizard.
 	if (state != S::Run) eeprom_update_byte((uint8_t*)EEPROM_WIZARD_ACTIVE, 1);
-
+	FORCE_BL_ON_START;
 	while (!end) {
 		printf_P(PSTR("Wizard state: %d\n"), state);
 		switch (state) {
@@ -5157,6 +5157,7 @@ void lcd_wizard(WizState state)
 		}
 	}
 
+	FORCE_BL_ON_END;
 	printf_P(_N("Wizard end state: %d\n"), state);
 	switch (state) { //final message
 	case S::Restore: //printer was already calibrated
@@ -7393,6 +7394,7 @@ bool lcd_selftest()
 	#ifdef TMC2130
 	  FORCE_HIGH_POWER_START;
 	#endif // TMC2130
+    FORCE_BL_ON_START;
 	_delay(2000);
 	KEEPALIVE_STATE(IN_HANDLER);
 
@@ -7612,6 +7614,7 @@ bool lcd_selftest()
 	#ifdef TMC2130
 	  FORCE_HIGH_POWER_END;
 	#endif // TMC2130
+    FORCE_BL_ON_END;
 	KEEPALIVE_STATE(NOT_BUSY);
 	return(_result);
 }
@@ -8021,6 +8024,7 @@ static bool lcd_selfcheck_check_heater(bool _isbed)
 static void lcd_selftest_error(TestError testError, const char *_error_1, const char *_error_2)
 {
 	lcd_beeper_quick_feedback();
+    FORCE_BL_ON_END;
 
 	target_temperature[0] = 0;
 	target_temperature_bed = 0;