LCD Class Reference
Inheritance diagram for LCD:

## Public Member Functions

| LCD ()
virtual 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 | moveCursorLeft ()
void | moveCursorRight ()
void | autoscroll ()
void | noAutoscroll ()
void | createChar (uint8_t location, uint8_t charmap[])
void | setCursor (uint8_t col, uint8_t row)
void | backlight (void)
void | noBacklight (void)
void | on (void)
void | off (void)
virtual void | setBacklightPin (uint8_t value, t_backlightPol pol)
virtual void | setBacklight (uint8_t value)
virtual void | write (uint8_t value)

## Protected Attributes

uint8_t | _displayfunction
uint8_t | _displaycontrol
uint8_t | _displaymode
uint8_t | _numlines
uint8_t | _cols
t_backlightPol | _polarity

## Constructor & Destructor Documentation

LCD::LCD | ( |  | ) |

LiquidCrystal abstract constructor. LiquidCrystal class abstract constructor needed to create the base abstract class.

## Member Function Documentation

void LCD::autoscroll | ( | void |  | ) |

Turns on automatic scrolling of the LCD. Turns on automatic scrolling of the LCD. This causes each character output to the display to push previous characters over by one space. If the current text direction is left-to-right (the default), the display scrolls to the left; if the current direction is right-to-left, the display scrolls to the right. This has the effect of outputting each new character to the same location on the LCD.

Parameters

  none |

void LCD::backlight | ( | void |  | ) |

Switch-on the LCD backlight. Switch-on the LCD backlight. The setBacklightPin has to be called before setting the backlight for this method to work.

See also
  setBacklightPin.

void LCD::begin | ( | uint8_t | cols,
|  | uint8_t | rows,
|  | uint8_t | charsize = `LCD_5x8DOTS`
| ) |  |

virtual

LCD initialization. Initializes the LCD to a given size (col, row). This methods initializes the LCD, therefore, it MUST be called prior to using any other method from this class.

This method is abstract, a base implementation is available common to all LCD drivers. Should it not be compatible with some other LCD driver, a derived implementation should be done on the driver specif class.

Parameters

  cols[in] | the number of columns that the display has
  rows[in] | the number of rows that the display has
  charsize[in] | character size, default==LCD_5x8DOTS

Reimplemented in LiquidCrystal_I2C, and LiquidCrystal_I2C_ByVac.

void LCD::blink | ( |  | ) |

Display the cursor of the LCD. Display the blinking LCD cursor. If used in combination with the cursor() function, the result will depend on the particular display.

Parameters

  none |

void LCD::clear | ( |  | ) |

Clears the LCD. Clears the LCD screen and positions the cursor in the upper-left corner.

This operation is time consuming for the LCD.

Parameters

  none |

void LCD::createChar | ( | uint8_t | location,
|  | uint8_t | charmap[]
| ) |  |

Creates a custom character for use on the LCD. Create a custom character (glyph) for use on the LCD. Most chipsets only support up to eight characters of 5x8 pixels. Therefore, this methods has been limited to locations (numbered 0 to 7).

The appearance of each custom character is specified by an array of eight bytes, one for each row. The five least significant bits of each byte determine the pixels in that row. To display a custom character on screen, write()/print() its number, i.e. lcd.print (char(x)); // Where x is 0..7.

Parameters

  location[in] | LCD memory location of the character to create (0 to 7)
  charmap[in] | the bitmap array representing each row of the character.

void LCD::cursor | ( |  | ) |

Display the LCD cursor. Display the LCD cursor: an underscore (line) at the location where the next character will be written.

Parameters

  none |

void LCD::display | ( |  | ) |

Turns on the LCD display. Turns on the LCD display, after it's been turned off with noDisplay(). This will restore the text (and cursor location) that was on the display prior to calling noDisplay().

Parameters

  none |

void LCD::home | ( |  | ) |

Sets the cursor to the upper-left corner. Positions the cursor in the upper-left of the LCD. That is, use that location in outputting subsequent text to the display. To also clear the display, use the clear() function instead.

This operation is time consuming for the LCD.

Parameters

  none |

void LCD::leftToRight | ( | void |  | ) |

Set the direction for text written to the LCD to left-to-right. Set the direction for text written to the LCD to left-to-right. All subsequent characters written to the display will go from left to right, but does not affect previously-output text.

This is the default configuration.

Parameters

  none |

void LCD::moveCursorLeft | ( | void |  | ) |

Moves the cursor one space to the left.

Parameters

  none |

void LCD::moveCursorRight | ( | void |  | ) |

Moves the cursor one space to the right.

Parameters

  none |

void LCD::noAutoscroll | ( | void |  | ) |

Turns off automatic scrolling of the LCD. Turns off automatic scrolling of the LCD, this is the default configuration of the LCD.

Parameters

  none |

void LCD::noBacklight | ( | void |  | ) |

Switch-off the LCD backlight. Switch-off the LCD backlight. The setBacklightPin has to be called before setting the backlight for this method to work.

See also
  setBacklightPin.

void LCD::noBlink | ( |  | ) |

Turns off the blinking of the LCD cursor.

Parameters

  none |

void LCD::noCursor | ( |  | ) |

Hides the LCD cursor.

Parameters

  none |

void LCD::noDisplay | ( |  | ) |

Turns off the LCD display. Turns off the LCD display, without losing the text currently being displayed on it.

Parameters

  none |

void LCD::off | ( | void |  | ) |

Switch off the LCD module. Switch off the LCD module, it will switch off the LCD controller and the backlight. This method has the same effect of calling noDisplay and noBacklight.

See also
  display,
  backlight

void LCD::on | ( | void |  | ) |

Switch on the LCD module. Switch on the LCD module, it will switch on the LCD controller and the backlight. This method has the same effect of calling display and backlight.

See also
  display,
  backlight

void LCD::rightToLeft | ( | void |  | ) |

Set the direction for text written to the LCD to right-to-left. Set the direction for text written to the LCD to right-to-left. All subsequent characters written to the display will go from right to left, but does not affect previously-output text.

left-to-right is the default configuration.

Parameters

  none |

void LCD::scrollDisplayLeft | ( | void |  | ) |

Scrolls the contents of the display (text and cursor) one space to the left.

Parameters

  none |

void LCD::scrollDisplayRight | ( | void |  | ) |

Scrolls the contents of the display (text and cursor) one space to the right.

Parameters

  none |

virtual void LCD::setBacklight | ( | uint8_t | value | ) |

inlinevirtual

Sets the pin to control the backlight. Sets the pin in the device to control the backlight. The behaviour of this method is very dependent on the device. Some controllers support dimming some don't. Please read the actual header file for each individual device. The setBacklightPin method has to be called before setting the backlight or the adequate backlight control constructor.

See also
  setBacklightPin.

NOTE: The prefered methods to control the backlight are "backlight" and "noBacklight".

Parameters

  0..255 | - the value is very dependent on the LCD. However, BACKLIGHT_OFF will be interpreted as off and BACKLIGHT_ON will drive the backlight on.

Reimplemented in LiquidCrystal_SR2W, LiquidCrystal_SR3W, LiquidCrystal_I2C, LiquidCrystal_SR, LiquidCrystal, and LiquidCrystal_I2C_ByVac.

virtual void LCD::setBacklightPin | ( | uint8_t | value,
|  | t_backlightPol | pol
| ) |  |

inlinevirtual

Sets the pin to control the backlight. Sets the pin in the device to control the backlight. This method is device dependent and can be programmed on each subclass. An empty function call is provided that does nothing.

Parameters

  value | pin associated to backlight control.
  pol | backlight polarity control (POSITIVE, NEGATIVE)

Reimplemented in LiquidCrystal_SR3W, LiquidCrystal_I2C, LiquidCrystal_SR, and LiquidCrystal.

void LCD::setCursor | ( | uint8_t | col,
|  | uint8_t | row
| ) |  |

Position the LCD cursor. Sets the position of the LCD cursor. Set the location at which subsequent text written to the LCD will be displayed.

Parameters

  col[in] | LCD column
  row[in] | LCD row - line.

void LCD::write | ( | uint8_t | value | ) |

virtual

Writes to the LCD. This method writes character to the LCD in the current cursor position.

This is the virtual write method, implemented in the Print class, therefore all Print class methods will end up calling this method.

Parameters

  value[in] | Value to write to the LCD.

The documentation for this class was generated from the following files:

- /Users/fmalpartida/Documents/development/mercurial repos/SW/NewLiquidCrystal_lib/LCD.h
- /Users/fmalpartida/Documents/development/mercurial repos/SW/NewLiquidCrystal_lib/LCD.cpp