Replaced LiquidCrystal_I2C lib with newer version which was reported to have worked on the arduino forum - ref http://forum.arduino.cc/index.php?topic=310743.msg2186521#msg2186521

Author: rogerclarkmelbourne

STM32F1/libraries/LiquidCrystal_I2C/LiquidCrystal_I2C.cpp

@@ -1,7 +1,10 @@
+// LiquidCrystal_I2C V2.0
+
 #include "LiquidCrystal_I2C.h"
 #include <inttypes.h>
-#include <Arduino.h>
-#include <Wire.h>
+#include "Wire.h"
+#include "Arduino.h"
+
 
 // When the display powers up, it is configured as follows:
 //
@@ -22,55 +25,64 @@
 // can't assume that its in that state when a sketch starts (and the
 // LiquidCrystal constructor is called).
 
-LiquidCrystal_I2C::LiquidCrystal_I2C(uint8_t lcd_addr, uint8_t lcd_cols, uint8_t lcd_rows, uint8_t charsize)
+LiquidCrystal_I2C::LiquidCrystal_I2C(uint8_t lcd_Addr,uint8_t lcd_cols,uint8_t lcd_rows)
 {
-	_addr = lcd_addr;
-	_cols = lcd_cols;
-	_rows = lcd_rows;
-	_charsize = charsize;
-	_backlightval = LCD_BACKLIGHT;
+  _Addr = lcd_Addr;
+  _cols = lcd_cols;
+  _rows = lcd_rows;
+  _backlightval = LCD_NOBACKLIGHT;
+}
+
+void LiquidCrystal_I2C::init(){
+	init_priv();
 }
 
-void LiquidCrystal_I2C::begin() {
+void LiquidCrystal_I2C::init_priv()
+{
 	Wire.begin();
 	_displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS;
+	begin(_cols, _rows);  
+}
 
-	if (_rows > 1) {
+void LiquidCrystal_I2C::begin(uint8_t cols, uint8_t lines, uint8_t dotsize) {
+	if (lines > 1) {
 		_displayfunction |= LCD_2LINE;
 	}
+	_numlines = lines;
 
 	// for some 1 line displays you can select a 10 pixel high font
-	if ((_charsize != 0) && (_rows == 1)) {
+	if ((dotsize != 0) && (lines == 1)) {
 		_displayfunction |= LCD_5x10DOTS;
 	}
 
 	// SEE PAGE 45/46 FOR INITIALIZATION SPECIFICATION!
 	// according to datasheet, we need at least 40ms after power rises above 2.7V
 	// before sending commands. Arduino can turn on way befer 4.5V so we'll wait 50
-	delay(50); 
-
+	delayMicroseconds(50000); 
+  
 	// Now we pull both RS and R/W low to begin commands
 	expanderWrite(_backlightval);	// reset expanderand turn backlight off (Bit 8 =1)
 	delay(1000);
 
-	//put the LCD into 4 bit mode
+  	//put the LCD into 4 bit mode
 	// this is according to the hitachi HD44780 datasheet
 	// figure 24, pg 46
-
+	
 	// we start in 8bit mode, try to set 4 bit mode
-	write4bits(0x03 << 4);
+	write4bits(0x03);
 	delayMicroseconds(4500); // wait min 4.1ms
-
+	
 	// second try
-	write4bits(0x03 << 4);
+	write4bits(0x03);
 	delayMicroseconds(4500); // wait min 4.1ms
-
+	
 	// third go!
-	write4bits(0x03 << 4); 
+	write4bits(0x03); 
 	delayMicroseconds(150);
-
+	
 	// finally, set to 4-bit interface
-	write4bits(0x02 << 4); 
+	write4bits(0x02); 
+
 
 	// set # lines, font size, etc.
 	command(LCD_FUNCTIONSET | _displayfunction);  
@@ -89,8 +101,11 @@ void LiquidCrystal_I2C::begin() {
 	command(LCD_ENTRYMODESET | _displaymode);
 
 	home();
+  
 }
 
+
+
 /********** high level commands, for the user! */
 void LiquidCrystal_I2C::clear(){
 	command(LCD_CLEARDISPLAY);// clear display, set cursor position to zero
@@ -104,8 +119,8 @@ void LiquidCrystal_I2C::home(){
 
 void LiquidCrystal_I2C::setCursor(uint8_t col, uint8_t row){
 	int row_offsets[] = { 0x00, 0x40, 0x14, 0x54 };
-	if (row > _rows) {
-		row = _rows-1;    // we count rows starting w/0
+	if ( row > _numlines ) {
+		row = _numlines-1;    // we count rows starting w/0
 	}
 	command(LCD_SETDDRAMADDR | (col + row_offsets[row]));
 }
@@ -193,6 +208,8 @@ void LiquidCrystal_I2C::backlight(void) {
 	expanderWrite(0);
 }
 
+
+
 /*********** mid level commands, for sending data/cmds */
 
 inline void LiquidCrystal_I2C::command(uint8_t value) {
@@ -201,46 +218,67 @@ inline void LiquidCrystal_I2C::command(uint8_t value) {
 
 inline size_t LiquidCrystal_I2C::write(uint8_t value) {
 	send(value, Rs);
+	return 0;
 }
 
 
+
 /************ low level data pushing commands **********/
 
 // write either command or data
 void LiquidCrystal_I2C::send(uint8_t value, uint8_t mode) {
-	uint8_t highnib=value&0xf0;
-	uint8_t lownib=(value<<4)&0xf0;
+	uint8_t highnib=value>>4;
+	uint8_t lownib=value & 0x0F;
 	write4bits((highnib)|mode);
-	write4bits((lownib)|mode); 
+	write4bits((lownib)|mode);
 }
 
 void LiquidCrystal_I2C::write4bits(uint8_t value) {
 	expanderWrite(value);
 	pulseEnable(value);
 }
 
-void LiquidCrystal_I2C::expanderWrite(uint8_t _data){                                        
-	Wire.beginTransmission(_addr);
+void LiquidCrystal_I2C::expanderWrite(uint8_t _data){                                        
+	Wire.beginTransmission(_Addr);
 	Wire.write((int)(_data) | _backlightval);
 	Wire.endTransmission();   
 }
 
-void LiquidCrystal_I2C::pulseEnable(uint8_t _data){
-	expanderWrite(_data | En);	// En high
-	delayMicroseconds(1);		// enable pulse must be >450ns
+void LiquidCrystal_I2C::pulseEnable(uint8_t _data){
+	expanderWrite(_data | En);	// En high
+	delayMicroseconds(1);		// enable pulse must be >450ns
 
-	expanderWrite(_data & ~En);	// En low
-	delayMicroseconds(50);		// commands need > 37us to settle
+	expanderWrite(_data & ~En);	// En low
+	delayMicroseconds(50);		// commands need > 37us to settle
+} 
+
+
+// Alias functions
+
+void LiquidCrystal_I2C::cursor_on(){
+	cursor();
+}
+
+void LiquidCrystal_I2C::cursor_off(){
+	noCursor();
+}
+
+void LiquidCrystal_I2C::blink_on(){
+	blink();
+}
+
+void LiquidCrystal_I2C::blink_off(){
+	noBlink();
 }
 
 void LiquidCrystal_I2C::load_custom_character(uint8_t char_num, uint8_t *rows){
-	createChar(char_num, rows);
+		createChar(char_num, rows);
 }
 
 void LiquidCrystal_I2C::setBacklight(uint8_t new_val){
-	if (new_val) {
+	if(new_val){
 		backlight();		// turn backlight on
-	} else {
+	}else{
 		noBacklight();		// turn backlight off
 	}
 }
@@ -250,3 +288,17 @@ void LiquidCrystal_I2C::printstr(const char c[]){
 	//it's here so the user sketch doesn't have to be changed 
 	print(c);
 }
+
+
+// unsupported API functions
+void LiquidCrystal_I2C::off(){}
+void LiquidCrystal_I2C::on(){}
+void LiquidCrystal_I2C::setDelay (int cmdDelay,int charDelay) {}
+uint8_t LiquidCrystal_I2C::status(){return 0;}
+uint8_t LiquidCrystal_I2C::keypad (){return 0;}
+uint8_t LiquidCrystal_I2C::init_bargraph(uint8_t graphtype){return 0;}
+void LiquidCrystal_I2C::draw_horizontal_graph(uint8_t row, uint8_t column, uint8_t len,  uint8_t pixel_col_end){}
+void LiquidCrystal_I2C::draw_vertical_graph(uint8_t row, uint8_t column, uint8_t len,  uint8_t pixel_row_end){}
+void LiquidCrystal_I2C::setContrast(uint8_t new_val){}
+
+