Merge pull request #8 from ortegafernando/master

Now, createChar function can use PROGMEM charmap

LiquidCrystal_I2C.cpp

@@ -214,6 +214,15 @@ void LiquidCrystal_I2C::createChar(uint8_t location, uint8_t charmap[]) {
 	}
 }
 
+//createChar with PROGMEM input
+void LiquidCrystal_I2C::createChar(uint8_t location, const char *charmap) {
+	location &= 0x7; // we only have 8 locations 0-7
+	command(LCD_SETCGRAMADDR | (location << 3));
+	for (int i=0; i<8; i++) {
+	    	write(pgm_read_byte_near(charmap++));
+	}
+}
+
 // Turn the (optional) backlight off/on
 void LiquidCrystal_I2C::noBacklight(void) {
 	_backlightval=LCD_NOBACKLIGHT;

LiquidCrystal_I2C.h

@@ -77,6 +77,9 @@ public:
   void autoscroll();
   void noAutoscroll(); 
   void createChar(uint8_t, uint8_t[]);
+  void createChar(uint8_t location, const char *charmap);
+  // Example: 	const char bell[8] PROGMEM = {B00100,B01110,B01110,B01110,B11111,B00000,B00100,B00000};
+  
   void setCursor(uint8_t, uint8_t); 
 #if defined(ARDUINO) && ARDUINO >= 100
   virtual size_t write(uint8_t);