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https://github.com/fmalpartida/New-LiquidCrystal.git
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304 lines
8.5 KiB
C++
304 lines
8.5 KiB
C++
// ---------------------------------------------------------------------------
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// Created by Francisco Malpartida on 20/08/11.
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// Copyright 2011 - Under creative commons license 3.0:
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// Attribution-ShareAlike CC BY-SA
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//
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// This software is furnished "as is", without technical support, and with no
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// warranty, express or implied, as to its usefulness for any purpose.
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//
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// Thread Safe: No
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// Extendable: Yes
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//
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// @file LiquidCrystal_4bit.cpp
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// This file implements a basic liquid crystal library that comes as standard
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// in the Arduino SDK.
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//
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// @brief
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// This is a basic implementation of the LiquidCrystal library of the
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// Arduino SDK. The original library has been reworked in such a way that
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// this class implements the all methods to command an LCD based
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// on the Hitachi HD44780 and compatible chipsets using the parallel port of
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// the LCD (4 bit and 8 bit).
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//
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// The functionality provided by this class and its base class is identical
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// to the original functionality of the Arduino LiquidCrystal library.
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//
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//
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// This library is only compatible with Arduino's SDK version 1.0
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//
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//
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// @author F. Malpartida - fmalpartida@gmail.com
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// ---------------------------------------------------------------------------
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#include <stdio.h>
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#include <string.h>
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#include <inttypes.h>
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#include <Arduino.h>
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#include <LiquidCrystal_4bit.h>
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// When the display powers up, it is configured as follows:
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//
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// 1. Display clear
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// 2. Function set:
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// DL = 1; 8-bit interface data
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// N = 0; 1-line display
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// F = 0; 5x8 dot character font
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// 3. Display on/off control:
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// D = 0; Display off
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// C = 0; Cursor off
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// B = 0; Blinking off
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// 4. Entry mode set:
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// I/D = 1; Increment by 1
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// S = 0; No shift
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//
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// Note, however, that resetting the Arduino doesn't reset the LCD, so we
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// can't assume that its in that state when a sketch starts (and the
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// LiquidCrystal_4bit constructor is called).
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// A call to begin() will reinitialize the LCD.
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// CONSTRUCTORS
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// ---------------------------------------------------------------------------
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LiquidCrystal_4bit::LiquidCrystal_4bit(uint8_t rs, uint8_t rw, uint8_t enable,
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uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
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uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7)
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{
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init(0, rs, rw, enable, d0, d1, d2, d3, d4, d5, d6, d7);
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}
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LiquidCrystal_4bit::LiquidCrystal_4bit(uint8_t rs, uint8_t enable,
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uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
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uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7)
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{
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init(0, rs, 255, enable, d0, d1, d2, d3, d4, d5, d6, d7);
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}
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LiquidCrystal_4bit::LiquidCrystal_4bit(uint8_t rs, uint8_t rw, uint8_t enable,
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uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3)
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{
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init(1, rs, rw, enable, d0, d1, d2, d3, 0, 0, 0, 0);
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}
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LiquidCrystal_4bit::LiquidCrystal_4bit(uint8_t rs, uint8_t enable,
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uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3)
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{
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init(1, rs, 255, enable, d0, d1, d2, d3, 0, 0, 0, 0);
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}
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// PRIVATE METHODS
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// ---------------------------------------------------------------------------
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//
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// init
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void LiquidCrystal_4bit::init(uint8_t fourbitmode, uint8_t rs, uint8_t rw, uint8_t enable,
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uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
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uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7)
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{
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uint8_t i;
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// Initialize the IO pins
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// -----------------------
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_rs_pin = rs;
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_rw_pin = rw;
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_enable_pin = enable;
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_data_pins[0] = d0;
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_data_pins[1] = d1;
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_data_pins[2] = d2;
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_data_pins[3] = d3;
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_data_pins[4] = d4;
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_data_pins[5] = d5;
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_data_pins[6] = d6;
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_data_pins[7] = d7;
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// Initialize the IO port direction to OUTPUT
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// ------------------------------------------
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for ( uint8_t i = 0; i < 4; i++ )
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{
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pinMode ( _data_pins[i], OUTPUT );
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}
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// Initialize the rest of the ports if it is an 8bit controlled LCD
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// ----------------------------------------------------------------
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if ( !fourbitmode )
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{
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for ( uint8_t i = 4; i < 7; i++ )
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{
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pinMode ( _data_pins[i], OUTPUT );
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}
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}
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pinMode(_rs_pin, OUTPUT);
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// we can save 1 pin by not using RW. Indicate by passing 255 instead of pin#
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if (_rw_pin != 255)
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{
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pinMode(_rw_pin, OUTPUT);
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}
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pinMode(_enable_pin, OUTPUT);
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// Initialise displaymode functions to defaults: LCD_1LINE and LCD_5x8DOTS
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// -------------------------------------------------------------------------
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if (fourbitmode)
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_displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS;
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else
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_displayfunction = LCD_8BITMODE | LCD_1LINE | LCD_5x8DOTS;
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}
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// PUBLIC METHODS
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// ---------------------------------------------------------------------------
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//
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// begin
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void LiquidCrystal_4bit::begin(uint8_t cols, uint8_t lines, uint8_t dotsize)
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{
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if (lines > 1)
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{
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_displayfunction |= LCD_2LINE;
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}
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_numlines = lines;
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// for some 1 line displays you can select a 10 pixel high font
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// ------------------------------------------------------------
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if ((dotsize != 0) && (lines == 1))
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{
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_displayfunction |= LCD_5x10DOTS;
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}
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// SEE PAGE 45/46 FOR INITIALIZATION SPECIFICATION!
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// according to datasheet, we need at least 40ms after power rises above 2.7V
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// before sending commands. Arduino can turn on way before 4.5V so we'll wait
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// 50
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// ---------------------------------------------------------------------------
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delayMicroseconds(50000);
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// Now we pull both RS and R/W low to begin commands
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digitalWrite(_rs_pin, LOW);
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digitalWrite(_enable_pin, LOW);
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if (_rw_pin != 255)
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{
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digitalWrite(_rw_pin, LOW);
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}
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//put the LCD into 4 bit or 8 bit mode
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// -------------------------------------
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if (! (_displayfunction & LCD_8BITMODE))
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{
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// this is according to the hitachi HD44780 datasheet
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// figure 24, pg 46
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// we start in 8bit mode, try to set 4 bit mode
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write4bits(0x03);
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delayMicroseconds(4500); // wait min 4.1ms
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// second try
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write4bits(0x03);
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delayMicroseconds(4500); // wait min 4.1ms
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// third go!
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write4bits(0x03);
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delayMicroseconds(150);
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// finally, set to 4-bit interface
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write4bits(0x02);
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}
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else
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{
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// this is according to the hitachi HD44780 datasheet
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// page 45 figure 23
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// Send function set command sequence
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command(LCD_FUNCTIONSET | _displayfunction);
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delayMicroseconds(4500); // wait more than 4.1ms
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// second try
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command(LCD_FUNCTIONSET | _displayfunction);
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delayMicroseconds(150);
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// third go
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command(LCD_FUNCTIONSET | _displayfunction);
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}
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// finally, set # lines, font size, etc.
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command(LCD_FUNCTIONSET | _displayfunction);
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// turn the display on with no cursor or blinking default
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_displaycontrol = LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF;
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display();
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// clear the LCD
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clear();
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// Initialize to default text direction (for romance languages)
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_displaymode = LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT;
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// set the entry mode
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command(LCD_ENTRYMODESET | _displaymode);
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}
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/************ low level data pushing commands **********/
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// send
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void LiquidCrystal_4bit::send(uint8_t value, uint8_t mode)
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{
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digitalWrite(_rs_pin, mode);
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// if there is a RW pin indicated, set it low to Write
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// ---------------------------------------------------
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if (_rw_pin != 255)
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{
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digitalWrite(_rw_pin, LOW);
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}
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if (_displayfunction & LCD_8BITMODE)
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{
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write8bits(value);
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}
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else
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{
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write4bits(value>>4);
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write4bits(value);
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}
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}
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//
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// pulseEnable
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void LiquidCrystal_4bit::pulseEnable(void)
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{
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digitalWrite(_enable_pin, LOW);
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delayMicroseconds(1);
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digitalWrite(_enable_pin, HIGH);
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delayMicroseconds(1); // enable pulse must be > 450ns
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digitalWrite(_enable_pin, LOW);
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delayMicroseconds(100); // commands need > 37us to settle
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}
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//
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// write4bits
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void LiquidCrystal_4bit::write4bits(uint8_t value)
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{
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for (uint8_t i = 0; i < 4; i++)
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{
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digitalWrite(_data_pins[i], (value >> i) & 0x01);
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}
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pulseEnable();
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}
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//
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// write8bits
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void LiquidCrystal_4bit::write8bits(uint8_t value)
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{
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for (uint8_t i = 0; i < 8; i++)
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{
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digitalWrite(_data_pins[i], (value >> i) & 0x01);
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}
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pulseEnable();
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}
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