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#include "PortsLCD.h"
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#if ARDUINO>=100
#include <Arduino.h> // Arduino 1.0
#else
#include <WProgram.h> // Arduino 0022
#endif
void LiquidCrystalBase::begin(byte cols, byte lines, byte 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); // can't use delay, may get called before main!
// Now we pull both RS and R/W low to begin commands
config();
//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 8-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 LiquidCrystalBase::clear()
{
command(LCD_CLEARDISPLAY); // clear display, set cursor position to zero
delayMicroseconds(2000); // this command takes a long time!
}
void LiquidCrystalBase::home()
{
command(LCD_RETURNHOME); // set cursor position to zero
delayMicroseconds(2000); // this command takes a long time!
}
void LiquidCrystalBase::setCursor(byte col, byte 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 LiquidCrystalBase::noDisplay() {
_displaycontrol &= ~LCD_DISPLAYON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
void LiquidCrystalBase::display() {
_displaycontrol |= LCD_DISPLAYON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
/// Turns the underline cursor on/off
void LiquidCrystalBase::noCursor() {
_displaycontrol &= ~LCD_CURSORON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
void LiquidCrystalBase::cursor() {
_displaycontrol |= LCD_CURSORON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
/// Turn on and off the blinking cursor
void LiquidCrystalBase::noBlink() {
_displaycontrol &= ~LCD_BLINKON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
void LiquidCrystalBase::blink() {
_displaycontrol |= LCD_BLINKON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
/// These commands scroll the display without changing the RAM
void LiquidCrystalBase::scrollDisplayLeft(void) {
command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVELEFT);
}
void LiquidCrystalBase::scrollDisplayRight(void) {
command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVERIGHT);
}
/// This is for text that flows Left to Right
void LiquidCrystalBase::leftToRight(void) {
_displaymode |= LCD_ENTRYLEFT;
command(LCD_ENTRYMODESET | _displaymode);
}
/// This is for text that flows Right to Left
void LiquidCrystalBase::rightToLeft(void) {
_displaymode &= ~LCD_ENTRYLEFT;
command(LCD_ENTRYMODESET | _displaymode);
}
/// This will 'right justify' text from the cursor
void LiquidCrystalBase::autoscroll(void) {
_displaymode |= LCD_ENTRYSHIFTINCREMENT;
command(LCD_ENTRYMODESET | _displaymode);
}
/// This will 'left justify' text from the cursor
void LiquidCrystalBase::noAutoscroll(void) {
_displaymode &= ~LCD_ENTRYSHIFTINCREMENT;
command(LCD_ENTRYMODESET | _displaymode);
}
/// Allows us to fill the first 8 CGRAM locations
/// with custom characters
void LiquidCrystalBase::createChar(byte location, byte 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 LiquidCrystalBase::command(byte value) {
send(value, LOW);
}
inline WRITE_RESULT LiquidCrystalBase::write(byte value) {
send(value, HIGH);
#if ARDUINO >= 100 && !defined(__AVR_ATtiny84__) && !defined(__AVR_ATtiny85__) && !defined(__AVR_ATtiny44__) && !defined(__AVR_ATtiny45__)
return 1;
#endif
}
// 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(byte rs, byte rw, byte enable,
byte d0, byte d1, byte d2, byte d3, byte d4, byte d5, byte d6, byte d7)
{
init(0, rs, rw, enable, d0, d1, d2, d3, d4, d5, d6, d7);
}
LiquidCrystal::LiquidCrystal(byte rs, byte enable,
byte d0, byte d1, byte d2, byte d3, byte d4, byte d5, byte d6, byte d7)
{
init(0, rs, -1, enable, d0, d1, d2, d3, d4, d5, d6, d7);
}
LiquidCrystal::LiquidCrystal(byte rs, byte rw, byte enable,
byte d0, byte d1, byte d2, byte d3)
{
init(1, rs, rw, enable, d0, d1, d2, d3, 0, 0, 0, 0);
}
LiquidCrystal::LiquidCrystal(byte rs, byte enable,
byte d0, byte d1, byte d2, byte d3)
{
init(1, rs, -1, enable, d0, d1, d2, d3, 0, 0, 0, 0);
}
void LiquidCrystal::init(byte fourbitmode, byte rs, byte rw, byte enable,
byte d0, byte d1, byte d2, byte d3, byte d4, byte d5, byte d6, byte 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 -1 instead of pin#
if (_rw_pin != -1) {
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);
}
/************ low level data pushing commands **********/
void LiquidCrystal::config() {
// 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 != -1) {
digitalWrite(_rw_pin, LOW);
}
}
/// write either command or data, with automatic 4/8-bit selection
void LiquidCrystal::send(byte value, byte mode) {
digitalWrite(_rs_pin, mode);
// if there is a RW pin indicated, set it low to Write
if (_rw_pin != -1) {
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(byte value) {
for (int i = 0; i < 4; i++) {
pinMode(_data_pins[i], OUTPUT);
digitalWrite(_data_pins[i], (value >> i) & 0x01);
}
pulseEnable();
}
void LiquidCrystal::write8bits(byte value) {
for (int i = 0; i < 8; i++) {
pinMode(_data_pins[i], OUTPUT);
digitalWrite(_data_pins[i], (value >> i) & 0x01);
}
pulseEnable();
}
enum {
MCP_IODIR, MCP_IPOL, MCP_GPINTEN, MCP_DEFVAL, MCP_INTCON, MCP_IOCON,
MCP_GPPU, MCP_INTF, MCP_INTCAP, MCP_GPIO, MCP_OLAT
};
// bits 0..3 and D4..D7, the rest is connected as follows
#define MCP_BACKLIGHT 0x80
#define MCP_ENABLE 0x40
#define MCP_OTHER 0x20
#define MCP_REGSEL 0x10
LiquidCrystalI2C::LiquidCrystalI2C (const PortI2C& p, byte addr)
: device (p, addr) {
_displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS;
begin(16, 2);
}
void LiquidCrystalI2C::backlight() {
device.send();
device.write(MCP_IODIR);
device.write(0); // IODIR: all outputs
device.stop();
}
void LiquidCrystalI2C::noBacklight() {
device.send();
device.write(MCP_IODIR);
device.write(MCP_BACKLIGHT); // IODIR: all outputs, except backlight
device.stop();
}
/************ low level data pushing commands **********/
void LiquidCrystalI2C::config() {
// IOCON: SEQOP = 1, ODR = 1, rest zero
device.send();
device.write(MCP_IOCON);
device.write(0x24);
device.stop();
backlight(); // start with backlight on
}
/// write either command or data, with automatic 4/8-bit selection
void LiquidCrystalI2C::send(byte value, byte mode) {
if (mode != 0)
mode = MCP_REGSEL;
write4bits((value >> 4) | mode);
write4bits((value & 0x0F) | mode);
}
void LiquidCrystalI2C::write4bits(byte value) {
value |= MCP_BACKLIGHT | MCP_ENABLE;
device.send();
device.write(MCP_GPIO);
device.write(value);
device.write(value ^ MCP_ENABLE);
device.write(value);
device.stop();
}
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