Modify LCD initialization to reduce failure

Modify LCD initialization to reduce failure , Thanks Garry
Change initialization sequence and modify some timing
not sure it solve issue of  random white screen during print

src/ArduinoDUE/Repetier/ui.cpp

@@ -490,7 +490,7 @@ void initializeLCD()
     // according to datasheet, we need at least 40ms after power rises above 2.7V
     // before sending commands. Arduino can turn on way before 4.5V.
     // is this delay long enough for all cases??
-    HAL::delayMilliseconds(235);
+    HAL::delayMilliseconds(500);
     SET_OUTPUT(UI_DISPLAY_D4_PIN);
     SET_OUTPUT(UI_DISPLAY_D5_PIN);
     SET_OUTPUT(UI_DISPLAY_D6_PIN);
@@ -503,6 +503,7 @@ void initializeLCD()
 
     // Now we pull both RS and R/W low to begin commands
     WRITE(UI_DISPLAY_RS_PIN, LOW);
+    HAL::delayMicroseconds(5);
     WRITE(UI_DISPLAY_ENABLE_PIN, LOW);
 
     //put the LCD into 4 bit mode
@@ -519,20 +520,33 @@ void initializeLCD()
     HAL::delayMicroseconds(5500); // I have one LCD for which 4500 here was not long enough.
     // second try
     lcdWriteNibble(0x03);
-    HAL::delayMicroseconds(180); // wait
+    HAL::delayMicroseconds(150); // wait
     // third go!
     lcdWriteNibble(0x03);
-    HAL::delayMicroseconds(180);
+    HAL::delayMicroseconds(150);
     // finally, set to 4-bit interface
     lcdWriteNibble(0x02);
-    HAL::delayMicroseconds(180);
+    HAL::delayMicroseconds(150);
+    
+    lcdCommand(LCD_DISPLAYOFF); 
+    HAL::delayMicroseconds(120);
+    
+    lcdCommand(LCD_CLEAR);                  //- Clear Screen
+    HAL::delayMilliseconds(10); // clear is slow operation
+    
     // finally, set # lines, font size, etc.
     lcdCommand(LCD_4BIT | LCD_2LINE | LCD_5X7);
+    HAL::delayMicroseconds(120);
+    
+    lcdCommand(LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKINGOFF);    //- Display on
+    HAL::delayMicroseconds(150);
+
+    lcdCommand(LCD_INCREASE | LCD_DISPLAYSHIFTOFF); //- Entrymode (Display Shift: off, Increment Address Counter)
+    HAL::delayMicroseconds(150);
 
     lcdCommand(LCD_CLEAR);                  //- Clear Screen
-    HAL::delayMilliseconds(2); // clear is slow operation
-    lcdCommand(LCD_INCREASE | LCD_DISPLAYSHIFTOFF); //- Entrymode (Display Shift: off, Increment Address Counter)
-    lcdCommand(LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKINGOFF);    //- Display on
+    HAL::delayMilliseconds(10); // clear is slow operation
+
     uid.lastSwitch = uid.lastRefresh = HAL::timeInMilliseconds();
     uid.createChar(1,character_back);
     uid.createChar(2,character_degree);