/** Send data to LCD 8 or 4 bits */
void lcd_send(u8 value, u8 mode)
{
digitalwrite(_rs_pin, mode);
if (_displayfunction & LCD_8BITMODE)
{
lcd_write8bits(value);
}
else
{
lcd_write4bits(value >> 4); // Upper 4 bits first
lcd_write4bits(value); // Lower 4 bits second
}
}
// write either command or data, with automatic 4/8-bit selection
void lcd_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) {
lcd_write8bits(value);
} else {
lcd_write4bits(value>>4);
lcd_write4bits(value & 0x0F);
}
}
/** Initial Display settings! */
void lcd_begin(u8 lines, u8 dotsize)
{
if (lines > 1)
_displayfunction |= LCD_2LINE;
_numlines = lines;
_currline = 0;
// Some one line displays can select 10 pixel high font
if ((dotsize != 0) && (lines == 1))
_displayfunction |= LCD_5x10DOTS;
Delayms(15); // Wait more than 15 ms after VDD rises to 4.5V
// Now we pull both RS and R/W low to begin commands
digitalwrite(_rs_pin, LOW);
digitalwrite(_enable_pin, LOW);
//put the LCD into 4 bit mode
if (! (_displayfunction & LCD_8BITMODE) )
{
// this is according to the hitachi HD44780 datasheet p46, figure 24
// we start in 8bit mode, try to set 4 bit mode
lcd_write4bits(0x03);
Delayms(5); // Wait for more than 4.1 ms
// second try
lcd_write4bits(0x03);
Delayus(150); // Wait more than 100 μs
// third go!
lcd_write4bits(0x03);
Delayus(150); // Wait more than 100 μs
// finally, set to 8-bit interface
lcd_write4bits(0x02);
}
//put the LCD into 8 bit mode
else
{
// this is according to the hitachi HD44780 datasheet p45, figure 23
// Send function set command sequence
lcd_command(LCD_FUNCTIONSET | _displayfunction);
Delayms(5); // Wait for more than 4.1 ms
// second try
lcd_command(LCD_FUNCTIONSET | _displayfunction);
Delayms(5); // Wait for more than 4.1 ms
// Delayus(150);
// third go
lcd_command(LCD_FUNCTIONSET | _displayfunction);
}
// finally, set # lines, font size, etc.
lcd_command(LCD_FUNCTIONSET | _displayfunction);
// turn the display on with no cursor or blinking default
_displaycontrol = LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF;
lcd_command(LCD_DISPLAYCONTROL | _displaycontrol);
// clear it off
lcd_command(LCD_CLEARDISPLAY); // clear display, set cursor position to zero
Delayms(2);
// Initialize to default text direction (for romance languages)
_displaymode = LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT;
// set the entry mode
lcd_command(LCD_ENTRYMODESET | _displaymode);
}
void lcd_begin(uint8_t cols, uint8_t rows)
{
uint8_t dotsize = LCD_5x8DOTS;
if (rows > 1) {
_displayfunction |= LCD_2LINE;
}
_numlines = rows;
_currline = 0;
// for some 1 line displays you can select a 10 pixel high font
if ((dotsize != 0) && (rows == 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 before 4.5V so we'll wait 50
delayMicroseconds(50000);
// Now we pull both RS and R/W low to begin commands
digitalWrite(_enable_pin, LOW);
digitalWrite(_rs_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
// page 46, figure 24
// we may not start in 8bit mode, try to set 8 bit mode
lcd_write4bits(0x03);
delayMicroseconds(4500); // wait min 4.1ms
// second try
lcd_write4bits(0x03);
delayMicroseconds(4500); // wait min 4.1ms
// third go!
lcd_write4bits(0x03);
delayMicroseconds(150);
// finally, set to 4-bit interface
lcd_write4bits(0x02);
} else {
// this is according to the hitachi HD44780 datasheet
// page 45 figure 23
// Send function set command sequence
lcd_command(LCD_FUNCTIONSET | _displayfunction);
delayMicroseconds(4500); // wait more than 4.1ms
// second try
//lcd_command(LCD_FUNCTIONSET | _displayfunction);
delayMicroseconds(150);
// third go
lcd_command(LCD_FUNCTIONSET | _displayfunction);
}
//return;
// finally, set # lines, font size, etc.
lcd_command(LCD_FUNCTIONSET | _displayfunction);
// turn the display on with no cursor or blinking default
_displaycontrol = LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF;
lcd_display();
// Initialize to default text direction (for romance languages)
_displaymode = LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT;
// set the entry mode
lcd_command(LCD_ENTRYMODESET | _displaymode);
// clear it off
lcd_clear();
}
