Merge branch 'ide-1.5.x'

README.adoc

@@ -0,0 +1,24 @@
+= Liquid Crystal Library for Arduino =
+
+This library allows an Arduino board to control LiquidCrystal displays (LCDs) based on the Hitachi HD44780 (or a compatible) chipset, which is found on most text-based LCDs.
+
+For more information about this library please visit us at
+http://arduino.cc/en/Reference/LiquidCrystal
+
+== License ==
+
+Copyright (c) Arduino LLC. All right reserved.
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

examples/Autoscroll/Autoscroll.ino

@@ -1,14 +1,14 @@
 /*
   LiquidCrystal Library - Autoscroll
- 
+
  Demonstrates the use a 16x2 LCD display.  The LiquidCrystal
- library works with all LCD displays that are compatible with the 
+ library works with all LCD displays that are compatible with the
  Hitachi HD44780 driver. There are many of them out there, and you
  can usually tell them by the 16-pin interface.
- 
+
  This sketch demonstrates the use of the autoscroll()
  and noAutoscroll() functions to make new text scroll or not.
- 
+
  The circuit:
  * LCD RS pin to digital pin 12
  * LCD Enable pin to digital pin 11
@@ -20,16 +20,16 @@
  * 10K resistor:
  * ends to +5V and ground
  * wiper to LCD VO pin (pin 3)
- 
+
  Library originally added 18 Apr 2008
  by David A. Mellis
  library modified 5 Jul 2009
  by Limor Fried (http://www.ladyada.net)
  example added 9 Jul 2009
- by Tom Igoe 
+ by Tom Igoe
  modified 22 Nov 2010
  by Tom Igoe
- 
+
  This example code is in the public domain.
 
  http://arduino.cc/en/Tutorial/LiquidCrystalAutoscroll
@@ -43,8 +43,8 @@
 LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
 
 void setup() {
-  // set up the LCD's number of columns and rows: 
+  // set up the LCD's number of columns and rows:
-  lcd.begin(16,2);
+  lcd.begin(16, 2);
 }
 
 void loop() {
@@ -52,12 +52,12 @@ void loop() {
   lcd.setCursor(0, 0);
   // print from 0 to 9:
   for (int thisChar = 0; thisChar < 10; thisChar++) {
-   lcd.print(thisChar);
+    lcd.print(thisChar);
-   delay(500);
+    delay(500);
   }
 
   // set the cursor to (16,1):
-  lcd.setCursor(16,1);
+  lcd.setCursor(16, 1);
   // set the display to automatically scroll:
   lcd.autoscroll();
   // print from 0 to 9:
@@ -67,7 +67,7 @@ void loop() {
   }
   // turn off automatic scrolling
   lcd.noAutoscroll();
-  
+
   // clear screen for the next loop:
   lcd.clear();
 }

examples/Blink/Blink.ino

@@ -1,14 +1,14 @@
 /*
   LiquidCrystal Library - Blink
- 
+
  Demonstrates the use a 16x2 LCD display.  The LiquidCrystal
- library works with all LCD displays that are compatible with the 
+ library works with all LCD displays that are compatible with the
  Hitachi HD44780 driver. There are many of them out there, and you
  can usually tell them by the 16-pin interface.
- 
+
- This sketch prints "Hello World!" to the LCD and makes the 
+ This sketch prints "Hello World!" to the LCD and makes the
  cursor block blink.
- 
+
  The circuit:
  * LCD RS pin to digital pin 12
  * LCD Enable pin to digital pin 11
@@ -20,20 +20,20 @@
  * 10K resistor:
    * ends to +5V and ground
    * wiper to LCD VO pin (pin 3)
- 
+
  Library originally added 18 Apr 2008
  by David A. Mellis
  library modified 5 Jul 2009
  by Limor Fried (http://www.ladyada.net)
  example added 9 Jul 2009
- by Tom Igoe 
+ by Tom Igoe
  modified 22 Nov 2010
  by Tom Igoe
- 
+
  This example code is in the public domain.
 
  http://arduino.cc/en/Tutorial/LiquidCrystalBlink
- 
+
  */
 
 // include the library code:
@@ -43,7 +43,7 @@
 LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
 
 void setup() {
-  // set up the LCD's number of columns and rows: 
+  // set up the LCD's number of columns and rows:
   lcd.begin(16, 2);
   // Print a message to the LCD.
   lcd.print("hello, world!");
@@ -53,7 +53,7 @@ void loop() {
   // Turn off the blinking cursor:
   lcd.noBlink();
   delay(3000);
-   // Turn on the blinking cursor:
+  // Turn on the blinking cursor:
   lcd.blink();
   delay(3000);
 }

examples/Cursor/Cursor.ino

@@ -1,15 +1,15 @@
 /*
   LiquidCrystal Library - Cursor
- 
+
  Demonstrates the use a 16x2 LCD display.  The LiquidCrystal
- library works with all LCD displays that are compatible with the 
+ library works with all LCD displays that are compatible with the
  Hitachi HD44780 driver. There are many of them out there, and you
  can usually tell them by the 16-pin interface.
- 
+
  This sketch prints "Hello World!" to the LCD and
  uses the cursor()  and noCursor() methods to turn
  on and off the cursor.
- 
+
  The circuit:
  * LCD RS pin to digital pin 12
  * LCD Enable pin to digital pin 11
@@ -21,13 +21,13 @@
  * 10K resistor:
  * ends to +5V and ground
  * wiper to LCD VO pin (pin 3)
- 
+
  Library originally added 18 Apr 2008
  by David A. Mellis
  library modified 5 Jul 2009
  by Limor Fried (http://www.ladyada.net)
  example added 9 Jul 2009
- by Tom Igoe 
+ by Tom Igoe
  modified 22 Nov 2010
  by Tom Igoe
 
@@ -44,7 +44,7 @@
 LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
 
 void setup() {
-  // set up the LCD's number of columns and rows: 
+  // set up the LCD's number of columns and rows:
   lcd.begin(16, 2);
   // Print a message to the LCD.
   lcd.print("hello, world!");
@@ -54,7 +54,7 @@ void loop() {
   // Turn off the cursor:
   lcd.noCursor();
   delay(500);
-   // Turn on the cursor:
+  // Turn on the cursor:
   lcd.cursor();
   delay(500);
 }

examples/CustomCharacter/CustomCharacter.ino

@@ -1,14 +1,14 @@
 /*
   LiquidCrystal Library - Custom Characters
- 
+
- Demonstrates how to add custom characters on an LCD  display.  
+ Demonstrates how to add custom characters on an LCD  display.
- The LiquidCrystal library works with all LCD displays that are 
+ The LiquidCrystal library works with all LCD displays that are
- compatible with the  Hitachi HD44780 driver. There are many of 
+ compatible with the  Hitachi HD44780 driver. There are many of
  them out there, and you can usually tell them by the 16-pin interface.
- 
+
  This sketch prints "I <heart> Arduino!" and a little dancing man
  to the LCD.
- 
+
   The circuit:
  * LCD RS pin to digital pin 12
  * LCD Enable pin to digital pin 11
@@ -29,13 +29,13 @@
  
  Based on Adafruit's example at
  https://github.com/adafruit/SPI_VFD/blob/master/examples/createChar/createChar.pde
- 
+
  This example code is in the public domain.
  http://www.arduino.cc/en/Tutorial/LiquidCrystal
- 
+
  Also useful:
  http://icontexto.com/charactercreator/
- 
+
  */
 
 // include the library code:
@@ -111,15 +111,15 @@ void setup() {
   // create a new character
   lcd.createChar(2, frownie);
   // create a new character
-  lcd.createChar(3, armsDown);  
+  lcd.createChar(3, armsDown);
   // create a new character
-  lcd.createChar(4, armsUp);  
+  lcd.createChar(4, armsUp);
 
   // Print a message to the lcd.
   lcd.print("I "); 
   lcd.write(byte(0)); // when calling lcd.write() '0' must be cast as a byte
   lcd.print(" Arduino! ");
-  lcd.write(1);
+  lcd.write((byte) 1);
 
 }
 
@@ -136,5 +136,5 @@ void loop() {
   lcd.setCursor(4, 1);
   // draw him arms up:
   lcd.write(4);
-  delay(delayTime); 
+  delay(delayTime);
 }

examples/Display/Display.ino

@@ -1,15 +1,15 @@
 /*
   LiquidCrystal Library - display() and noDisplay()
- 
+
  Demonstrates the use a 16x2 LCD display.  The LiquidCrystal
- library works with all LCD displays that are compatible with the 
+ library works with all LCD displays that are compatible with the
  Hitachi HD44780 driver. There are many of them out there, and you
  can usually tell them by the 16-pin interface.
- 
+
- This sketch prints "Hello World!" to the LCD and uses the 
+ This sketch prints "Hello World!" to the LCD and uses the
  display() and noDisplay() functions to turn on and off
  the display.
- 
+
  The circuit:
  * LCD RS pin to digital pin 12
  * LCD Enable pin to digital pin 11
@@ -21,13 +21,13 @@
  * 10K resistor:
  * ends to +5V and ground
  * wiper to LCD VO pin (pin 3)
- 
+
  Library originally added 18 Apr 2008
  by David A. Mellis
  library modified 5 Jul 2009
  by Limor Fried (http://www.ladyada.net)
  example added 9 Jul 2009
- by Tom Igoe 
+ by Tom Igoe
  modified 22 Nov 2010
  by Tom Igoe
 
@@ -44,7 +44,7 @@
 LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
 
 void setup() {
-  // set up the LCD's number of columns and rows: 
+  // set up the LCD's number of columns and rows:
   lcd.begin(16, 2);
   // Print a message to the LCD.
   lcd.print("hello, world!");
@@ -54,7 +54,7 @@ void loop() {
   // Turn off the display:
   lcd.noDisplay();
   delay(500);
-   // Turn on the display:
+  // Turn on the display:
   lcd.display();
   delay(500);
 }

examples/HelloWorld/HelloWorld.ino

@@ -1,14 +1,14 @@
 /*
   LiquidCrystal Library - Hello World
- 
+
  Demonstrates the use a 16x2 LCD display.  The LiquidCrystal
- library works with all LCD displays that are compatible with the 
+ library works with all LCD displays that are compatible with the
  Hitachi HD44780 driver. There are many of them out there, and you
  can usually tell them by the 16-pin interface.
- 
+
  This sketch prints "Hello World!" to the LCD
  and shows the time.
- 
+
   The circuit:
  * LCD RS pin to digital pin 12
  * LCD Enable pin to digital pin 11
@@ -22,7 +22,7 @@
  * 10K resistor:
  * ends to +5V and ground
  * wiper to LCD VO pin (pin 3)
- 
+
  Library originally added 18 Apr 2008
  by David A. Mellis
  library modified 5 Jul 2009
@@ -31,7 +31,7 @@
  by Tom Igoe
  modified 22 Nov 2010
  by Tom Igoe
- 
+
  This example code is in the public domain.
 
  http://www.arduino.cc/en/Tutorial/LiquidCrystal
@@ -44,7 +44,7 @@
 LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
 
 void setup() {
-  // set up the LCD's number of columns and rows: 
+  // set up the LCD's number of columns and rows:
   lcd.begin(16, 2);
   // Print a message to the LCD.
   lcd.print("hello, world!");
@@ -55,6 +55,6 @@ void loop() {
   // (note: line 1 is the second row, since counting begins with 0):
   lcd.setCursor(0, 1);
   // print the number of seconds since reset:
-  lcd.print(millis()/1000);
+  lcd.print(millis() / 1000);
 }
 

examples/Scroll/Scroll.ino

@@ -1,15 +1,15 @@
 /*
   LiquidCrystal Library - scrollDisplayLeft() and scrollDisplayRight()
- 
+
  Demonstrates the use a 16x2 LCD display.  The LiquidCrystal
- library works with all LCD displays that are compatible with the 
+ library works with all LCD displays that are compatible with the
  Hitachi HD44780 driver. There are many of them out there, and you
  can usually tell them by the 16-pin interface.
- 
+
  This sketch prints "Hello World!" to the LCD and uses the
  scrollDisplayLeft() and scrollDisplayRight() methods to scroll
  the text.
- 
+
   The circuit:
  * LCD RS pin to digital pin 12
  * LCD Enable pin to digital pin 11
@@ -21,18 +21,18 @@
  * 10K resistor:
  * ends to +5V and ground
  * wiper to LCD VO pin (pin 3)
- 
+
  Library originally added 18 Apr 2008
  by David A. Mellis
  library modified 5 Jul 2009
  by Limor Fried (http://www.ladyada.net)
  example added 9 Jul 2009
- by Tom Igoe 
+ by Tom Igoe
  modified 22 Nov 2010
  by Tom Igoe
- 
+
  This example code is in the public domain.
- 
+
  http://arduino.cc/en/Tutorial/LiquidCrystalScroll
 
  */
@@ -44,7 +44,7 @@
 LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
 
 void setup() {
-  // set up the LCD's number of columns and rows: 
+  // set up the LCD's number of columns and rows:
   lcd.begin(16, 2);
   // Print a message to the LCD.
   lcd.print("hello, world!");
@@ -52,11 +52,11 @@ void setup() {
 }
 
 void loop() {
-  // scroll 13 positions (string length) to the left 
+  // scroll 13 positions (string length) to the left
   // to move it offscreen left:
   for (int positionCounter = 0; positionCounter < 13; positionCounter++) {
     // scroll one position left:
-    lcd.scrollDisplayLeft(); 
+    lcd.scrollDisplayLeft();
     // wait a bit:
     delay(150);
   }
@@ -65,20 +65,20 @@ void loop() {
   // to move it offscreen right:
   for (int positionCounter = 0; positionCounter < 29; positionCounter++) {
     // scroll one position right:
-    lcd.scrollDisplayRight(); 
+    lcd.scrollDisplayRight();
     // wait a bit:
     delay(150);
   }
-  
+
-    // scroll 16 positions (display length + string length) to the left
+  // scroll 16 positions (display length + string length) to the left
-    // to move it back to center:
+  // to move it back to center:
   for (int positionCounter = 0; positionCounter < 16; positionCounter++) {
     // scroll one position left:
-    lcd.scrollDisplayLeft(); 
+    lcd.scrollDisplayLeft();
     // wait a bit:
     delay(150);
   }
-  
+
   // delay at the end of the full loop:
   delay(1000);
 

examples/SerialDisplay/SerialDisplay.ino

@@ -1,14 +1,14 @@
 /*
   LiquidCrystal Library - Serial Input
- 
+
  Demonstrates the use a 16x2 LCD display.  The LiquidCrystal
- library works with all LCD displays that are compatible with the 
+ library works with all LCD displays that are compatible with the
  Hitachi HD44780 driver. There are many of them out there, and you
  can usually tell them by the 16-pin interface.
- 
+
- This sketch displays text sent over the serial port 
+ This sketch displays text sent over the serial port
  (e.g. from the Serial Monitor) on an attached LCD.
- 
+
  The circuit:
  * LCD RS pin to digital pin 12
  * LCD Enable pin to digital pin 11
@@ -20,18 +20,18 @@
  * 10K resistor:
  * ends to +5V and ground
  * wiper to LCD VO pin (pin 3)
- 
+
  Library originally added 18 Apr 2008
  by David A. Mellis
  library modified 5 Jul 2009
  by Limor Fried (http://www.ladyada.net)
  example added 9 Jul 2009
- by Tom Igoe 
+ by Tom Igoe
  modified 22 Nov 2010
  by Tom Igoe
- 
+
  This example code is in the public domain.
- 
+
  http://arduino.cc/en/Tutorial/LiquidCrystalSerial
  */
 
@@ -41,8 +41,8 @@
 // initialize the library with the numbers of the interface pins
 LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
 
-void setup(){
+void setup() {
-    // set up the LCD's number of columns and rows: 
+  // set up the LCD's number of columns and rows:
   lcd.begin(16, 2);
   // initialize the serial communications:
   Serial.begin(9600);

examples/TextDirection/TextDirection.ino

@@ -1,40 +1,40 @@
-  /*
+/*
-  LiquidCrystal Library - TextDirection
+LiquidCrystal Library - TextDirection
- 
+
- Demonstrates the use a 16x2 LCD display.  The LiquidCrystal
+Demonstrates the use a 16x2 LCD display.  The LiquidCrystal
- library works with all LCD displays that are compatible with the 
+library works with all LCD displays that are compatible with the
- Hitachi HD44780 driver. There are many of them out there, and you
+Hitachi HD44780 driver. There are many of them out there, and you
- can usually tell them by the 16-pin interface.
+can usually tell them by the 16-pin interface.
- 
+
- This sketch demonstrates how to use leftToRight() and rightToLeft()
+This sketch demonstrates how to use leftToRight() and rightToLeft()
- to move the cursor.
+to move the cursor.
- 
+
- The circuit:
+The circuit:
- * LCD RS pin to digital pin 12
+* LCD RS pin to digital pin 12
- * LCD Enable pin to digital pin 11
+* LCD Enable pin to digital pin 11
- * LCD D4 pin to digital pin 5
+* LCD D4 pin to digital pin 5
- * LCD D5 pin to digital pin 4
+* LCD D5 pin to digital pin 4
- * LCD D6 pin to digital pin 3
+* LCD D6 pin to digital pin 3
- * LCD D7 pin to digital pin 2
+* LCD D7 pin to digital pin 2
- * LCD R/W pin to ground
+* LCD R/W pin to ground
- * 10K resistor:
+* 10K resistor:
- * ends to +5V and ground
+* ends to +5V and ground
- * wiper to LCD VO pin (pin 3)
+* wiper to LCD VO pin (pin 3)
- 
+
- Library originally added 18 Apr 2008
+Library originally added 18 Apr 2008
- by David A. Mellis
+by David A. Mellis
- library modified 5 Jul 2009
+library modified 5 Jul 2009
- by Limor Fried (http://www.ladyada.net)
+by Limor Fried (http://www.ladyada.net)
- example added 9 Jul 2009
+example added 9 Jul 2009
- by Tom Igoe 
+by Tom Igoe
- modified 22 Nov 2010
+modified 22 Nov 2010
- by Tom Igoe
+by Tom Igoe
- 
+
- This example code is in the public domain.
+This example code is in the public domain.
- 
+
- http://arduino.cc/en/Tutorial/LiquidCrystalTextDirection
+http://arduino.cc/en/Tutorial/LiquidCrystalTextDirection
- 
+
- */
+*/
 
 // include the library code:
 #include <LiquidCrystal.h>
@@ -45,7 +45,7 @@ LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
 int thisChar = 'a';
 
 void setup() {
-  // set up the LCD's number of columns and rows: 
+  // set up the LCD's number of columns and rows:
   lcd.begin(16, 2);
   // turn on the cursor:
   lcd.cursor();
@@ -55,17 +55,17 @@ void loop() {
   // reverse directions at 'm':
   if (thisChar == 'm') {
     // go right for the next letter
-    lcd.rightToLeft(); 
+    lcd.rightToLeft();
   }
   // reverse again at 's':
   if (thisChar == 's') {
     // go left for the next letter
-    lcd.leftToRight(); 
+    lcd.leftToRight();
   }
   // reset at 'z':
   if (thisChar > 'z') {
     // go to (0,0):
-    lcd.home(); 
+    lcd.home();
     // start again at 0
     thisChar = 'a';
   }

examples/setCursor/setCursor.ino

@@ -1,14 +1,14 @@
 /*
   LiquidCrystal Library - setCursor
- 
+
  Demonstrates the use a 16x2 LCD display.  The LiquidCrystal
- library works with all LCD displays that are compatible with the 
+ library works with all LCD displays that are compatible with the
  Hitachi HD44780 driver. There are many of them out there, and you
  can usually tell them by the 16-pin interface.
- 
+
  This sketch prints to all the positions of the LCD using the
  setCursor(0 method:
- 
+
   The circuit:
  * LCD RS pin to digital pin 12
  * LCD Enable pin to digital pin 11
@@ -20,18 +20,18 @@
  * 10K resistor:
  * ends to +5V and ground
  * wiper to LCD VO pin (pin 3)
- 
+
  Library originally added 18 Apr 2008
  by David A. Mellis
  library modified 5 Jul 2009
  by Limor Fried (http://www.ladyada.net)
  example added 9 Jul 2009
- by Tom Igoe 
+ by Tom Igoe
  modified 22 Nov 2010
  by Tom Igoe
- 
+
  This example code is in the public domain.
- 
+
  http://arduino.cc/en/Tutorial/LiquidCrystalSetCursor
 
  */
@@ -48,8 +48,8 @@ const int numCols = 16;
 LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
 
 void setup() {
-  // set up the LCD's number of columns and rows: 
+  // set up the LCD's number of columns and rows:
-  lcd.begin(numCols,numRows);
+  lcd.begin(numCols, numRows);
 }
 
 void loop() {
@@ -60,7 +60,7 @@ void loop() {
       // loop over the rows:
       for (int thisRow = 0; thisRow < numCols; thisRow++) {
         // set the cursor position:
-        lcd.setCursor(thisCol,thisRow);
+        lcd.setCursor(thisCol, thisRow);
         // print the letter:
         lcd.write(thisLetter);
         delay(200);

keywords.txt

@@ -30,6 +30,7 @@ rightToLeft	KEYWORD2
 scrollDisplayLeft	KEYWORD2
 scrollDisplayRight	KEYWORD2
 createChar	KEYWORD2
+setRowOffsets	KEYWORD2
 
 #######################################
 # Constants (LITERAL1)

library.properties

@@ -0,0 +1,9 @@
+name=LiquidCrystal
+version=1.0
+author=
+maintainer=Arduino <info@arduino.cc>
+sentence=Allows communication with alphanumerical liquid crystal displays (LCDs). For all Arduino boards.
+paragraph=This library allows an Arduino board to control LiquidCrystal displays (LCDs) based on the Hitachi HD44780 (or a compatible) chipset, which is found on most text-based LCDs. The library works with in either 4 or 8 bit mode (i.e. using 4 or 8 data lines in addition to the rs, enable, and, optionally, the rw control lines).
+category=Display
+url=http://arduino.cc/en/Reference/LiquidCrystal
+architectures=*

src/LiquidCrystal.cpp

@@ -87,10 +87,11 @@ void LiquidCrystal::begin(uint8_t cols, uint8_t lines, uint8_t dotsize) {
     _displayfunction |= LCD_2LINE;
   }
   _numlines = lines;
-  _currline = 0;
+
+  setRowOffsets(0x00, 0x40, 0x00 + cols, 0x40 + cols);  
 
   // for some 1 line displays you can select a 10 pixel high font
-  if ((dotsize != 0) && (lines == 1)) {
+  if ((dotsize != LCD_5x8DOTS) && (lines == 1)) {
     _displayfunction |= LCD_5x10DOTS;
   }
 
@@ -157,6 +158,14 @@ void LiquidCrystal::begin(uint8_t cols, uint8_t lines, uint8_t dotsize) {
 
 }
 
+void LiquidCrystal::setRowOffsets(int row0, int row1, int row2, int row3)
+{
+	_row_offsets[0] = row0;
+	_row_offsets[1] = row1;
+	_row_offsets[2] = row2;
+	_row_offsets[3] = row3;
+}
+
 /********** high level commands, for the user! */
 void LiquidCrystal::clear()
 {
@@ -172,12 +181,15 @@ void LiquidCrystal::home()
 
 void LiquidCrystal::setCursor(uint8_t col, uint8_t row)
 {
-  int row_offsets[] = { 0x00, 0x40, 0x14, 0x54 };
+  const size_t max_lines = sizeof(_row_offsets) / sizeof(*_row_offsets);
+  if ( row >= max_lines ) {
+    row = max_lines - 1;    // we count rows starting w/0
+  }
   if ( row >= _numlines ) {
-    row = _numlines-1;    // we count rows starting w/0
+    row = _numlines - 1;    // we count rows starting w/0
   }
   
-  command(LCD_SETDDRAMADDR | (col + row_offsets[row]));
+  command(LCD_SETDDRAMADDR | (col + _row_offsets[row]));
 }
 
 // Turn the display on/off (quickly)

src/LiquidCrystal.h

@@ -77,6 +77,7 @@ public:
   void autoscroll();
   void noAutoscroll();
 
+  void setRowOffsets(int row1, int row2, int row3, int row4);
   void createChar(uint8_t, uint8_t[]);
   void setCursor(uint8_t, uint8_t); 
   virtual size_t write(uint8_t);
@@ -100,7 +101,8 @@ private:
 
   uint8_t _initialized;
 
-  uint8_t _numlines,_currline;
+  uint8_t _numlines;
+  uint8_t _row_offsets[4];
 };
 
 #endif