LCD backlight brightnes pwm control and lcd blinking.

Firmware/Marlin.h

@@ -269,6 +269,11 @@ extern void homeaxis(int axis);
 extern unsigned char fanSpeedSoftPwm;
 #endif
 
+#if defined(LCD_PWM_PIN) && (LCD_PWM_PIN > -1)
+extern unsigned char lcdSoftPwm;
+extern unsigned char lcdBlinkDelay;
+#endif
+
 #ifdef FILAMENT_SENSOR
   extern float filament_width_nominal;  //holds the theoretical filament diameter ie., 3.00 or 1.75
   extern bool filament_sensor;  //indicates that filament sensor readings should control extrusion

Firmware/Marlin_main.cpp

@@ -1256,10 +1256,14 @@ void setup()
 
 
 
-#if defined(CONTROLLERFAN_PIN) && CONTROLLERFAN_PIN > -1
+#if defined(CONTROLLERFAN_PIN) && (CONTROLLERFAN_PIN > -1)
 	SET_OUTPUT(CONTROLLERFAN_PIN); //Set pin used for driver cooling fan
 #endif
 
+#if defined(LCD_PWM_PIN) && (LCD_PWM_PIN > -1)
+	SET_OUTPUT(LCD_PWM_PIN); //Set pin used for driver cooling fan
+#endif
+
 #ifdef DIGIPOT_I2C
 	digipot_i2c_init();
 #endif
@@ -6034,18 +6038,28 @@ case 404:  //M404 Enter the nominal filament width (3mm, 1.75mm ) N<3.0> or disp
 		}
 		break;
 	case 3:
-		calibrate_z_auto();
+		if (code_seen('L')) // lcd pwm (0-255)
+		{
+			lcdSoftPwm = (int)code_value();
+		}
+		if (code_seen('B')) // lcd blink delay (0-255)
+		{
+			lcdBlinkDelay = (int)code_value();
+		}
+//		calibrate_z_auto();
 /*		MYSERIAL.print("fsensor_enable()");
 #ifdef PAT9125
 		fsensor_enable();
 #endif*/
 		break;
 	case 4:
+//			lcdBlinkDelay = 10;
 /*		MYSERIAL.print("fsensor_disable()");
 #ifdef PAT9125
 		fsensor_disable();
 #endif            
 		break;*/
+		break;
 	case 5:
 		{
 /*			MYSERIAL.print("tmc2130_rd_MSCNT(0)=");

Firmware/pins_Einy_0_4.h

@@ -98,6 +98,9 @@
 
 #ifdef NEWPANEL
 
+#define LCD_PWM_PIN         32  // lcd backlight brightnes pwm control pin
+#define LCD_PWM_MAX       0x0f  // lcd pwm maximum value (0x07=64Hz, 0x0f=32Hz, 0x1f=16Hz)
+
 #define BEEPER              84  // Beeper on AUX-4
 #define LCD_PINS_RS         82
 #define LCD_PINS_ENABLE     61 // !!! changed from 18 (EINY03)

Firmware/temperature.cpp

@@ -75,8 +75,13 @@ float current_temperature_bed = 0.0;
   unsigned char fanSpeedSoftPwm;
 #endif
 
+#if defined(LCD_PWM_PIN) && (LCD_PWM_PIN > -1)
+  unsigned char lcdSoftPwm = (LCD_PWM_MAX * 2 + 1); //set default value to maximum
+  unsigned char lcdBlinkDelay = 0; //lcd blinking delay (0 = no blink)
+#endif
+
 unsigned char soft_pwm_bed;
-  
+
 #ifdef BABYSTEPPING
   volatile int babystepsTodo[3]={0,0,0};
 #endif
@@ -129,6 +134,12 @@ static volatile bool temp_meas_ready = false;
   static unsigned long extruder_autofan_last_check;
 #endif  
 
+#if defined(LCD_PWM_PIN) && (LCD_PWM_PIN > -1)
+  static unsigned char soft_pwm_lcd = 0;
+  static unsigned char lcd_blink_delay = 0;
+  static bool lcd_blink_on = false;
+#endif
+
 #if EXTRUDERS > 3
   # error Unsupported number of extruders
 #elif EXTRUDERS > 2
@@ -942,7 +953,12 @@ void tp_init()
     #ifdef FAN_SOFT_PWM
     soft_pwm_fan = fanSpeedSoftPwm / 2;
     #endif
-  #endif  
+	#if defined(LCD_PWM_PIN) && (LCD_PWM_PIN > -1)
+    soft_pwm_lcd = lcdSoftPwm / 2;
+	lcd_blink_delay = lcdBlinkDelay;
+    lcd_blink_on = true;
+    #endif
+  #endif
 
   #ifdef HEATER_0_USES_MAX6675
     #ifndef SDSUPPORT
@@ -1507,15 +1523,16 @@ ISR(TIMER0_COMPB_vect)
   /*
    * standard PWM modulation
    */
-  if(pwm_count == 0){
+  if (pwm_count == 0)
+  {
     soft_pwm_0 = soft_pwm[0];
-    if(soft_pwm_0 > 0) { 
+    if(soft_pwm_0 > 0)
+	{ 
       WRITE(HEATER_0_PIN,1);
 #ifdef HEATERS_PARALLEL
       WRITE(HEATER_1_PIN,1);
 #endif
     } else WRITE(HEATER_0_PIN,0);
-    
 #if EXTRUDERS > 1
     soft_pwm_1 = soft_pwm[1];
     if(soft_pwm_1 > 0) WRITE(HEATER_1_PIN,1); else WRITE(HEATER_1_PIN,0);
@@ -1533,12 +1550,35 @@ ISR(TIMER0_COMPB_vect)
     if(soft_pwm_fan > 0) WRITE(FAN_PIN,1); else WRITE(FAN_PIN,0);
 #endif
   }
-  if(soft_pwm_0 < pwm_count) { 
+  if(soft_pwm_0 < pwm_count)
+  { 
     WRITE(HEATER_0_PIN,0);
 #ifdef HEATERS_PARALLEL
     WRITE(HEATER_1_PIN,0);
 #endif
   }
+#if defined(LCD_PWM_PIN) && (LCD_PWM_PIN > -1)
+	if ((pwm_count & LCD_PWM_MAX) == 0)
+	{
+		if (lcd_blink_delay)
+		{
+			lcd_blink_delay--;
+			if (lcd_blink_delay == 0)
+			{
+				lcd_blink_delay = lcdBlinkDelay;
+				lcd_blink_on = !lcd_blink_on;
+			}
+		}
+		else
+		{
+			lcd_blink_delay = lcdBlinkDelay;
+			lcd_blink_on = true;
+		}
+		soft_pwm_lcd = (lcd_blink_on) ? (lcdSoftPwm / 2) : 0;
+		if (soft_pwm_lcd > 0) WRITE(LCD_PWM_PIN,1); else WRITE(LCD_PWM_PIN,0);
+	}
+#endif
+
 #if EXTRUDERS > 1
   if(soft_pwm_1 < pwm_count) WRITE(HEATER_1_PIN,0);
 #endif
@@ -1551,10 +1591,13 @@ ISR(TIMER0_COMPB_vect)
 #ifdef FAN_SOFT_PWM
   if(soft_pwm_fan < pwm_count) WRITE(FAN_PIN,0);
 #endif
+#if defined(LCD_PWM_PIN) && (LCD_PWM_PIN > -1)
+  if (soft_pwm_lcd < (pwm_count & LCD_PWM_MAX)) WRITE(LCD_PWM_PIN,0);
+#endif
   
   pwm_count += (1 << SOFT_PWM_SCALE);
   pwm_count &= 0x7f;
-  
+
 #else //ifndef SLOW_PWM_HEATERS
   /*
    * SLOW PWM HEATERS
@@ -1742,7 +1785,7 @@ ISR(TIMER0_COMPB_vect)
   }
   if (soft_pwm_fan < pwm_count) WRITE(FAN_PIN,0);
 #endif
-  
+
   pwm_count += (1 << SOFT_PWM_SCALE);
   pwm_count &= 0x7f;