cpp

#include "MyLiquidCrystal.h"


#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include "Arduino.h"


MyLiquidCrystal::MyLiquidCrystal(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);
}

MyLiquidCrystal::MyLiquidCrystal(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);
}

MyLiquidCrystal::MyLiquidCrystal(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);
}



MyLiquidCrystal::MyLiquidCrystal(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 MyLiquidCrystal::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)
{
  _register_select_pin = rs;
  _read_write_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;

  if (fourbitmode)
    _displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS;
  else
    _displayfunction = LCD_8BITMODE | LCD_1LINE | LCD_5x8DOTS;


  begin(16, 1);
}


//MODIFYYYYYYYYYYYYYYYYY!!!!!!!!!!!!!!!!!!!!!!!!!!!!

void MyLiquidCrystal::begin(uint8_t cols, uint8_t lines, uint8_t dotsize) {
  if (lines > 1) {
    _displayfunction |= LCD_2LINE;
  }
  _numlines = lines;

  setRowOffsets(0x00, 0x40, 0x00 + cols, 0x40 + cols);

  // for some 1 line displays you can select a 10 pixel high font
  if ((dotsize != LCD_5x8DOTS) && (lines == 1)) {
    _displayfunction |= LCD_5x10DOTS;
  }

  pinMode(_register_select_pin, OUTPUT);
  // we can save 1 pin by not using RW. Indicate by passing 255 instead of pin#
  if (_read_write_pin != 255) {
    pinMode(_read_write_pin, OUTPUT);
  }
  pinMode(_enable_pin, OUTPUT);

  // Do these once, instead of every time a character is drawn for speed reasons.
  for (int i=0; i<((_displayfunction & LCD_8BITMODE) ? 8 : 4); ++i)
  {
    pinMode(_data_pins[i], OUTPUT);
   }

  // 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 before 4.5V so we'll wait 50
  delayMicroseconds(50000);
  // Now we pull both RS and R/W low to begin commands
  digitalWrite(_register_select_pin, LOW);
  digitalWrite(_enable_pin, LOW);
  if (_read_write_pin != 255) {
    digitalWrite(_read_write_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);

}



void MyLiquidCrystal::setCursor(uint8_t col, uint8_t row)
{
  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
  }

  command(LCD_SETDDRAMADDR | (col + _row_offsets[row]));
}


void MyLiquidCrystal::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;
}

void MyLiquidCrystal::write4bits(uint8_t value) {
  for (int i = 0; i < 4; i++) {
    digitalWrite(_data_pins[i], (value >> i) & 0x01);
  }

  pulseEnable();
}

inline void MyLiquidCrystal::command(uint8_t value) {
  send(value, LOW);
}

void MyLiquidCrystal::display() {
  _displaycontrol |= LCD_DISPLAYON;
  command(LCD_DISPLAYCONTROL | _displaycontrol);
}

void MyLiquidCrystal::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 MyLiquidCrystal::send(uint8_t value, uint8_t mode) {
  digitalWrite(_register_select_pin, mode);

  // if there is a RW pin indicated, set it low to Write
  if (_read_write_pin != 255) {
    digitalWrite(_read_write_pin, LOW);
  }

  if (_displayfunction & LCD_8BITMODE) {
    write8bits(value);
  } else {
    write4bits(value>>4);
    write4bits(value);
  }
}

void MyLiquidCrystal::write8bits(uint8_t value) {
  for (int i = 0; i < 8; i++) {
    digitalWrite(_data_pins[i], (value >> i) & 0x01);
  }

  pulseEnable();
}