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Improved library for Freetronics LCD shield

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This commit is contained in:
Rhys Weatherley 2012-04-04 08:15:21 +10:00
parent 3577e80d27
commit 500c6d6931
7 changed files with 703 additions and 0 deletions
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52
HelloWorld/HelloWorld.pde Normal file
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/*
This example demonstrates how to use the FreetronicsLCD library, which extends the
standard LiquidCrystal library to provide support for the Freetronics back light
and Up/Down/Left/Right/Select buttons. More information on the shield here:
http://www.freetronics.com/pages/16x2-lcd-shield-quickstart-guide
*/
// include the library code:
#include <FreetronicsLCD.h>
// initialize the library
FreetronicsLCD lcd;
// Note: if you are using the USBDroid and have reassigned pin D9 on the LCD shield to some
// other pin (e.g. A1), then you will need to initialize the shield with something like:
// FreetronicsLCD lcd(A1);
// See also: http://www.freetronics.com/pages/combining-the-lcd-keypad-shield-and-the-usbdroid
void setup() {
// Enable the screen saver, which will automatically blank the screen after 10 seconds.
// The screen will wake up again when a button is pressed or lcd.display() is called.
lcd.enableScreenSaver();
// Print a message to the LCD.
lcd.print("hello, world!");
}
void loop() {
// set the cursor to column 0, line 1
// (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);
// print the name of the button that is currently pressed
lcd.setCursor(8, 1);
int button = lcd.getButton();
if (button == LCD_BUTTON_LEFT)
lcd.print("LEFT");
else if (button == LCD_BUTTON_RIGHT)
lcd.print("RIGHT");
else if (button == LCD_BUTTON_UP)
lcd.print("UP");
else if (button == LCD_BUTTON_DOWN)
lcd.print("DOWN");
else if (button == LCD_BUTTON_SELECT)
lcd.print("SELECT");
else if (button < 0) // button release
lcd.print(" ");
}

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libraries/FreetronicsLCD/FreetronicsLCD.cpp Normal file
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#include "FreetronicsLCD.h"
#include <WProgram.h>
#define LCD_BACK_LIGHT 3 // LCD backlight is on D3
#define LCD_BUTTON_PIN A0 // Button state is on A0
#define LCD_BUTTON_VALUE_GAP 10
#define LCD_BUTTON_RIGHT_VALUE 0
#define LCD_BUTTON_UP_VALUE 145
#define LCD_BUTTON_DOWN_VALUE 329
#define LCD_BUTTON_LEFT_VALUE 505
#define LCD_BUTTON_SELECT_VALUE 741
void FreetronicsLCD::init()
{
// The Freetronics display is 16x2.
begin(16, 2);
// Set the LCD back light to be initially on.
pinMode(LCD_BACK_LIGHT, OUTPUT);
digitalWrite(LCD_BACK_LIGHT, HIGH);
// Initialise button input.
pinMode(LCD_BUTTON_PIN, INPUT);
digitalWrite(LCD_BUTTON_PIN, LOW);
prevButton = LCD_BUTTON_NONE;
eatRelease = false;
// Initialize screen saver.
timeout = 0;
lastRestore = millis();
screenSaved = false;
}
void FreetronicsLCD::display()
{
LiquidCrystal::display();
digitalWrite(LCD_BACK_LIGHT, HIGH);
screenSaved = false;
lastRestore = millis();
}
void FreetronicsLCD::noDisplay()
{
LiquidCrystal::noDisplay();
digitalWrite(LCD_BACK_LIGHT, LOW);
screenSaved = true;
}
void FreetronicsLCD::enableScreenSaver(int timeoutSecs)
{
if (timeoutSecs < 0)
timeout = 0;
else
timeout = ((unsigned long)timeoutSecs) * 1000;
display();
}
void FreetronicsLCD::disableScreenSaver()
{
timeout = 0;
display();
}
int FreetronicsLCD::getButton()
{
int value = analogRead(LCD_BUTTON_PIN);
int button;
if (value < (LCD_BUTTON_RIGHT_VALUE + LCD_BUTTON_VALUE_GAP))
button = LCD_BUTTON_RIGHT;
else if (value >= (LCD_BUTTON_UP_VALUE - LCD_BUTTON_VALUE_GAP) &&
value <= (LCD_BUTTON_UP_VALUE + LCD_BUTTON_VALUE_GAP))
button = LCD_BUTTON_UP;
else if (value >= (LCD_BUTTON_DOWN_VALUE - LCD_BUTTON_VALUE_GAP) &&
value <= (LCD_BUTTON_DOWN_VALUE + LCD_BUTTON_VALUE_GAP))
button = LCD_BUTTON_DOWN;
else if (value >= (LCD_BUTTON_LEFT_VALUE - LCD_BUTTON_VALUE_GAP) &&
value <= (LCD_BUTTON_LEFT_VALUE + LCD_BUTTON_VALUE_GAP))
button = LCD_BUTTON_LEFT;
else if (value >= (LCD_BUTTON_SELECT_VALUE - LCD_BUTTON_VALUE_GAP) &&
value <= (LCD_BUTTON_SELECT_VALUE + LCD_BUTTON_VALUE_GAP))
button = LCD_BUTTON_SELECT;
else
button = LCD_BUTTON_NONE;
if (prevButton == LCD_BUTTON_NONE && button != LCD_BUTTON_NONE) {
prevButton = button;
if (screenSaved) {
// Button pressed when screen saver active.
display();
eatRelease = true;
return LCD_BUTTON_NONE;
}
eatRelease = false;
lastRestore = millis();
return button;
} else if (prevButton != LCD_BUTTON_NONE && button == LCD_BUTTON_NONE) {
button = -prevButton;
prevButton = LCD_BUTTON_NONE;
lastRestore = millis();
if (eatRelease) {
eatRelease = false;
return LCD_BUTTON_NONE;
}
return button;
} else {
if (!screenSaved && prevButton == LCD_BUTTON_NONE &&
timeout != 0 && (millis() - lastRestore) >= timeout)
noDisplay(); // Activate screen saver.
return LCD_BUTTON_NONE;
}
}

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libraries/FreetronicsLCD/FreetronicsLCD.h Normal file
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#ifndef FreetronicsLCD_h
#define FreetronicsLCD_h
// Extended version of the LiquidCrystal library that works specifically
// with Freetronics' 16x2 LCD display, including support for the back
// light and the Up/Down/Left/Right/Select buttons. More info:
//
// http://www.freetronics.com/pages/16x2-lcd-shield-quickstart-guide
// Include a copy of the standard LiquidCrystal library so we can extend it.
#include "utility/LiquidCrystal.h"
// Button event codes.
#define LCD_BUTTON_NONE 0
#define LCD_BUTTON_LEFT 1
#define LCD_BUTTON_RIGHT 2
#define LCD_BUTTON_UP 3
#define LCD_BUTTON_DOWN 4
#define LCD_BUTTON_SELECT 5
#define LCD_BUTTON_LEFT_RELEASED -1
#define LCD_BUTTON_RIGHT_RELEASED -2
#define LCD_BUTTON_UP_RELEASED -3
#define LCD_BUTTON_DOWN_RELEASED -4
#define LCD_BUTTON_SELECT_RELEASED -5
class FreetronicsLCD : public LiquidCrystal {
public:
FreetronicsLCD() : LiquidCrystal(8, 9, 4, 5, 6, 7) { init(); }
// For USBDroid where D9 needs to be reassigned to some other pin.
FreetronicsLCD(uint8_t pin9) : LiquidCrystal(8, pin9, 4, 5, 6, 7) { init(); }
// Turn on the display, including the back light and the text.
// This will also reset the screen saver timeout.
void display();
// Turn off the display, including the back light and the text,
// effectively forcing the screen saver to activate immediately.
void noDisplay();
// Enable the screen saver and activate it after timeout seconds
// of inactivity on the buttons. Note: the screen saver is activated
// during the call to getButton() so it must be polled regularly.
void enableScreenSaver(int timeoutSecs = 10);
// Disable the screen saver and turn the screen back on.
void disableScreenSaver();
// Determine if the screen saver is active.
bool isScreenSaved() const { return screenSaved; }
// Get the next button event, or LCD_BUTTON_NONE if no change
// since the last event. If the screen saver is active, then
// pressing a button will disable the screen saver and return
// LCD_BUTTON_NONE as the button code. Thus, any button can
// be used to wake up the screen.
int getButton();
private:
int prevButton;
unsigned long timeout;
unsigned long lastRestore;
bool screenSaved;
bool eatRelease;
void init();
};
#endif

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libraries/FreetronicsLCD/examples/HelloWorld/HelloWorld.pde Normal file
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/*
This example demonstrates how to use the FreetronicsLCD library, which extends the
standard LiquidCrystal library to provide support for the Freetronics back light
and Up/Down/Left/Right/Select buttons. More information on the shield here:
http://www.freetronics.com/pages/16x2-lcd-shield-quickstart-guide
*/
// include the library code:
#include <FreetronicsLCD.h>
// initialize the library
FreetronicsLCD lcd;
// Note: if you are using the USBDroid and have reassigned pin D9 on the LCD shield to some
// other pin (e.g. A1), then you will need to initialize the shield with something like:
// FreetronicsLCD lcd(A1);
// See also: http://www.freetronics.com/pages/combining-the-lcd-keypad-shield-and-the-usbdroid
void setup() {
// Enable the screen saver, which will automatically blank the screen after 10 seconds.
// The screen will wake up again when a button is pressed or lcd.display() is called.
lcd.enableScreenSaver();
// Print a message to the LCD.
lcd.print("hello, world!");
}
void loop() {
// set the cursor to column 0, line 1
// (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);
// print the name of the button that is currently pressed
lcd.setCursor(8, 1);
int button = lcd.getButton();
if (button == LCD_BUTTON_LEFT)
lcd.print("LEFT");
else if (button == LCD_BUTTON_RIGHT)
lcd.print("RIGHT");
else if (button == LCD_BUTTON_UP)
lcd.print("UP");
else if (button == LCD_BUTTON_DOWN)
lcd.print("DOWN");
else if (button == LCD_BUTTON_SELECT)
lcd.print("SELECT");
else if (button < 0) // button release
lcd.print(" ");
}

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libraries/FreetronicsLCD/keywords.txt Normal file
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FreetronicsLCD KEYWORD1
getButton KEYWORD2
enableScreenSaver KEYWORD2
disableScreenSaver KEYWORD2
isScreenSaved KEYWORD2

309
libraries/FreetronicsLCD/utility/LiquidCrystal.cpp Normal file
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#include "LiquidCrystal.h"
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include "WProgram.h"
// When the display powers up, it is configured as follows:
//
// 1. Display clear
// 2. Function set:
// DL = 1; 8-bit interface data
// N = 0; 1-line display
// F = 0; 5x8 dot character font
// 3. Display on/off control:
// D = 0; Display off
// C = 0; Cursor off
// B = 0; Blinking off
// 4. Entry mode set:
// I/D = 1; Increment by 1
// S = 0; No shift
//
// Note, however, that resetting the Arduino doesn't reset the LCD, so we
// can't assume that its in that state when a sketch starts (and the
// LiquidCrystal constructor is called).
LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable,
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7)
{
init(0, rs, rw, enable, d0, d1, d2, d3, d4, d5, d6, d7);
}
LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t enable,
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7)
{
init(0, rs, 255, enable, d0, d1, d2, d3, d4, d5, d6, d7);
}
LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable,
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3)
{
init(1, rs, rw, enable, d0, d1, d2, d3, 0, 0, 0, 0);
}
LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t enable,
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3)
{
init(1, rs, 255, enable, d0, d1, d2, d3, 0, 0, 0, 0);
}
void LiquidCrystal::init(uint8_t fourbitmode, uint8_t rs, uint8_t rw, uint8_t enable,
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7)
{
_rs_pin = rs;
_rw_pin = rw;
_enable_pin = enable;
_data_pins[0] = d0;
_data_pins[1] = d1;
_data_pins[2] = d2;
_data_pins[3] = d3;
_data_pins[4] = d4;
_data_pins[5] = d5;
_data_pins[6] = d6;
_data_pins[7] = d7;
pinMode(_rs_pin, OUTPUT);
// we can save 1 pin by not using RW. Indicate by passing 255 instead of pin#
if (_rw_pin != 255) {
pinMode(_rw_pin, OUTPUT);
}
pinMode(_enable_pin, OUTPUT);
if (fourbitmode)
_displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS;
else
_displayfunction = LCD_8BITMODE | LCD_1LINE | LCD_5x8DOTS;
begin(16, 1);
}
void LiquidCrystal::begin(uint8_t cols, uint8_t lines, uint8_t dotsize) {
if (lines > 1) {
_displayfunction |= LCD_2LINE;
}
_numlines = lines;
_currline = 0;
// for some 1 line displays you can select a 10 pixel high font
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
delayMicroseconds(50000);
// Now we pull both RS and R/W low to begin commands
digitalWrite(_rs_pin, LOW);
digitalWrite(_enable_pin, LOW);
if (_rw_pin != 255) {
digitalWrite(_rw_pin, LOW);
}
//put the LCD into 4 bit or 8 bit mode
if (! (_displayfunction & LCD_8BITMODE)) {
// 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);
delayMicroseconds(4500); // wait min 4.1ms
// second try
write4bits(0x03);
delayMicroseconds(4500); // wait min 4.1ms
// third go!
write4bits(0x03);
delayMicroseconds(150);
// finally, set to 4-bit interface
write4bits(0x02);
} else {
// this is according to the hitachi HD44780 datasheet
// page 45 figure 23
// Send function set command sequence
command(LCD_FUNCTIONSET | _displayfunction);
delayMicroseconds(4500); // wait more than 4.1ms
// second try
command(LCD_FUNCTIONSET | _displayfunction);
delayMicroseconds(150);
// third go
command(LCD_FUNCTIONSET | _displayfunction);
}
// finally, set # lines, font size, etc.
command(LCD_FUNCTIONSET | _displayfunction);
// turn the display on with no cursor or blinking default
_displaycontrol = LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF;
display();
// clear it off
clear();
// Initialize to default text direction (for romance languages)
_displaymode = LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT;
// set the entry mode
command(LCD_ENTRYMODESET | _displaymode);
}
/********** high level commands, for the user! */
void LiquidCrystal::clear()
{
command(LCD_CLEARDISPLAY); // clear display, set cursor position to zero
delayMicroseconds(2000); // this command takes a long time!
}
void LiquidCrystal::home()
{
command(LCD_RETURNHOME); // set cursor position to zero
delayMicroseconds(2000); // this command takes a long time!
}
void LiquidCrystal::setCursor(uint8_t col, uint8_t row)
{
int row_offsets[] = { 0x00, 0x40, 0x14, 0x54 };
if ( row > _numlines ) {
row = _numlines-1; // we count rows starting w/0
}
command(LCD_SETDDRAMADDR | (col + row_offsets[row]));
}
// Turn the display on/off (quickly)
void LiquidCrystal::noDisplay() {
_displaycontrol &= ~LCD_DISPLAYON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
void LiquidCrystal::display() {
_displaycontrol |= LCD_DISPLAYON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
// Turns the underline cursor on/off
void LiquidCrystal::noCursor() {
_displaycontrol &= ~LCD_CURSORON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
void LiquidCrystal::cursor() {
_displaycontrol |= LCD_CURSORON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
// Turn on and off the blinking cursor
void LiquidCrystal::noBlink() {
_displaycontrol &= ~LCD_BLINKON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
void LiquidCrystal::blink() {
_displaycontrol |= LCD_BLINKON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
// These commands scroll the display without changing the RAM
void LiquidCrystal::scrollDisplayLeft(void) {
command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVELEFT);
}
void LiquidCrystal::scrollDisplayRight(void) {
command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVERIGHT);
}
// This is for text that flows Left to Right
void LiquidCrystal::leftToRight(void) {
_displaymode |= LCD_ENTRYLEFT;
command(LCD_ENTRYMODESET | _displaymode);
}
// This is for text that flows Right to Left
void LiquidCrystal::rightToLeft(void) {
_displaymode &= ~LCD_ENTRYLEFT;
command(LCD_ENTRYMODESET | _displaymode);
}
// This will 'right justify' text from the cursor
void LiquidCrystal::autoscroll(void) {
_displaymode |= LCD_ENTRYSHIFTINCREMENT;
command(LCD_ENTRYMODESET | _displaymode);
}
// This will 'left justify' text from the cursor
void LiquidCrystal::noAutoscroll(void) {
_displaymode &= ~LCD_ENTRYSHIFTINCREMENT;
command(LCD_ENTRYMODESET | _displaymode);
}
// Allows us to fill the first 8 CGRAM locations
// with custom characters
void LiquidCrystal::createChar(uint8_t location, uint8_t charmap[]) {
location &= 0x7; // we only have 8 locations 0-7
command(LCD_SETCGRAMADDR | (location << 3));
for (int i=0; i<8; i++) {
write(charmap[i]);
}
}
/*********** mid level commands, for sending data/cmds */
inline void LiquidCrystal::command(uint8_t value) {
send(value, LOW);
}
inline void LiquidCrystal::write(uint8_t value) {
send(value, HIGH);
}
/************ low level data pushing commands **********/
// write either command or data, with automatic 4/8-bit selection
void LiquidCrystal::send(uint8_t value, uint8_t mode) {
digitalWrite(_rs_pin, mode);
// if there is a RW pin indicated, set it low to Write
if (_rw_pin != 255) {
digitalWrite(_rw_pin, LOW);
}
if (_displayfunction & LCD_8BITMODE) {
write8bits(value);
} else {
write4bits(value>>4);
write4bits(value);
}
}
void LiquidCrystal::pulseEnable(void) {
digitalWrite(_enable_pin, LOW);
delayMicroseconds(1);
digitalWrite(_enable_pin, HIGH);
delayMicroseconds(1); // enable pulse must be >450ns
digitalWrite(_enable_pin, LOW);
delayMicroseconds(100); // commands need > 37us to settle
}
void LiquidCrystal::write4bits(uint8_t value) {
for (int i = 0; i < 4; i++) {
pinMode(_data_pins[i], OUTPUT);
digitalWrite(_data_pins[i], (value >> i) & 0x01);
}
pulseEnable();
}
void LiquidCrystal::write8bits(uint8_t value) {
for (int i = 0; i < 8; i++) {
pinMode(_data_pins[i], OUTPUT);
digitalWrite(_data_pins[i], (value >> i) & 0x01);
}
pulseEnable();
}

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libraries/FreetronicsLCD/utility/LiquidCrystal.h Normal file
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#ifndef LiquidCrystal_h
#define LiquidCrystal_h
#include <inttypes.h>
#include "Print.h"
// commands
#define LCD_CLEARDISPLAY 0x01
#define LCD_RETURNHOME 0x02
#define LCD_ENTRYMODESET 0x04
#define LCD_DISPLAYCONTROL 0x08
#define LCD_CURSORSHIFT 0x10
#define LCD_FUNCTIONSET 0x20
#define LCD_SETCGRAMADDR 0x40
#define LCD_SETDDRAMADDR 0x80
// flags for display entry mode
#define LCD_ENTRYRIGHT 0x00
#define LCD_ENTRYLEFT 0x02
#define LCD_ENTRYSHIFTINCREMENT 0x01
#define LCD_ENTRYSHIFTDECREMENT 0x00
// flags for display on/off control
#define LCD_DISPLAYON 0x04
#define LCD_DISPLAYOFF 0x00
#define LCD_CURSORON 0x02
#define LCD_CURSOROFF 0x00
#define LCD_BLINKON 0x01
#define LCD_BLINKOFF 0x00
// flags for display/cursor shift
#define LCD_DISPLAYMOVE 0x08
#define LCD_CURSORMOVE 0x00
#define LCD_MOVERIGHT 0x04
#define LCD_MOVELEFT 0x00
// flags for function set
#define LCD_8BITMODE 0x10
#define LCD_4BITMODE 0x00
#define LCD_2LINE 0x08
#define LCD_1LINE 0x00
#define LCD_5x10DOTS 0x04
#define LCD_5x8DOTS 0x00
class LiquidCrystal : public Print {
public:
LiquidCrystal(uint8_t rs, uint8_t enable,
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7);
LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable,
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7);
LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable,
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3);
LiquidCrystal(uint8_t rs, uint8_t enable,
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3);
void init(uint8_t fourbitmode, uint8_t rs, uint8_t rw, uint8_t enable,
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7);
void begin(uint8_t cols, uint8_t rows, uint8_t charsize = LCD_5x8DOTS);
void clear();
void home();
void noDisplay();
void display();
void noBlink();
void blink();
void noCursor();
void cursor();
void scrollDisplayLeft();
void scrollDisplayRight();
void leftToRight();
void rightToLeft();
void autoscroll();
void noAutoscroll();
void createChar(uint8_t, uint8_t[]);
void setCursor(uint8_t, uint8_t);
virtual void write(uint8_t);
void command(uint8_t);
private:
void send(uint8_t, uint8_t);
void write4bits(uint8_t);
void write8bits(uint8_t);
void pulseEnable();
uint8_t _rs_pin; // LOW: command. HIGH: character.
uint8_t _rw_pin; // LOW: write to LCD. HIGH: read from LCD.
uint8_t _enable_pin; // activated by a HIGH pulse.
uint8_t _data_pins[8];
uint8_t _displayfunction;
uint8_t _displaycontrol;
uint8_t _displaymode;
uint8_t _initialized;
uint8_t _numlines,_currline;
};
#endif