162 lines
5.8 KiB
C++
162 lines
5.8 KiB
C++
// ---------------------------------------------------------------------------
|
|
// Created by Francisco Malpartida on 20/08/11.
|
|
// Copyright 2011 - Under creative commons license 3.0:
|
|
// Attribution-ShareAlike CC BY-SA
|
|
//
|
|
// This software is furnished "as is", without technical support, and with no
|
|
// warranty, express or implied, as to its usefulness for any purpose.
|
|
//
|
|
// Thread Safe: No
|
|
// Extendable: Yes
|
|
//
|
|
// @file LiquidCrystal.h
|
|
// This file implements a basic liquid crystal library that comes as standard
|
|
// in the Arduino SDK.
|
|
//
|
|
// @brief
|
|
// This is a basic implementation of the LiquidCrystal library of the
|
|
// Arduino SDK. The original library has been reworked in such a way that
|
|
// this class implements the all methods to command an LCD based
|
|
// on the Hitachi HD44780 and compatible chipsets using the parallel port of
|
|
// the LCD (4 bit and 8 bit).
|
|
//
|
|
//
|
|
//
|
|
// @author F. Malpartida - fmalpartida@gmail.com
|
|
// ---------------------------------------------------------------------------
|
|
#ifndef LiquidCrystal_4bit_h
|
|
#define LiquidCrystal_4bit_h
|
|
|
|
#include <inttypes.h>
|
|
|
|
#include "LCD.h"
|
|
#include "FastIO.h"
|
|
|
|
|
|
/*!
|
|
@defined
|
|
@abstract Command execution time on the LCD.
|
|
@discussion This defines how long a command takes to execute by the LCD.
|
|
The time is expressed in micro-seconds.
|
|
*/
|
|
#define EXEC_TIME 37
|
|
|
|
class LiquidCrystal : public LCD
|
|
{
|
|
public:
|
|
/*!
|
|
@method
|
|
@abstract 8 bit LCD constructors.
|
|
@discussion Defines the pin assignment that the LCD will have.
|
|
The constructor does not initialize the LCD.
|
|
*/
|
|
LiquidCrystal(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);
|
|
LiquidCrystal(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);
|
|
|
|
// Constructors with backlight control
|
|
LiquidCrystal(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,
|
|
uint8_t backlightPin, t_backlighPol pol);
|
|
LiquidCrystal(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,
|
|
uint8_t backlightPin, t_backlighPol pol);
|
|
/*!
|
|
@method
|
|
@abstract 4 bit LCD constructors.
|
|
@discussion Defines the pin assignment that the LCD will have.
|
|
The constructor does not initialize the LCD.
|
|
*/
|
|
LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable,
|
|
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3);
|
|
LiquidCrystal(uint8_t rs, uint8_t enable,
|
|
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3);
|
|
|
|
// Constructors with backlight control
|
|
LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable,
|
|
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
|
|
uint8_t backlightPin, t_backlighPol pol);
|
|
LiquidCrystal(uint8_t rs, uint8_t enable,
|
|
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
|
|
uint8_t backlightPin, t_backlighPol pol);
|
|
/*!
|
|
@function
|
|
@abstract Send a particular value to the LCD.
|
|
@discussion Sends a particular value to the LCD for writing to the LCD or
|
|
as an LCD command.
|
|
|
|
Users should never call this method.
|
|
|
|
@param value Value to send to the LCD.
|
|
@result mode LOW - write to the LCD CGRAM, HIGH - write a command to
|
|
the LCD.
|
|
*/
|
|
virtual void send(uint8_t value, uint8_t mode);
|
|
|
|
/*!
|
|
@function
|
|
@abstract Sets the pin to control the backlight.
|
|
@discussion Sets the pin in the device to control the backlight.
|
|
|
|
@param pin: pin assigned to the backlight
|
|
@param pol: backlight pin control polarity (POSITIVE, NEGATIVE).
|
|
*/
|
|
void setBacklightPin ( uint8_t pin, t_backlighPol pol );
|
|
|
|
/*!
|
|
@function
|
|
@abstract Switch-on/off the LCD backlight.
|
|
@discussion Switch-on/off the LCD backlight.
|
|
The setBacklightPin has to be called before setting the backlight for
|
|
this method to work. @see setBacklightPin. For dimming control of the
|
|
backlight, the configuration pin must be a PWM output pin. Dim control
|
|
is achieved by passing a value from 1 to 255 as a parameter. If the
|
|
pin configured when calling the setBacklightPin does not support PWM,
|
|
then: (0) backlight off, (1..255) backlight on.
|
|
|
|
@param value: backlight value. 0: off, 1..255: dim control of the
|
|
backlight. For negative logic 255: off, 254..0: dim control.
|
|
*/
|
|
void setBacklight ( uint8_t value );
|
|
|
|
private:
|
|
|
|
/*!
|
|
@method
|
|
@abstract Initializes the LCD pin allocation and associated HW
|
|
@discussion Initializes the LCD pin allocation and configuration.
|
|
*/
|
|
void 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);
|
|
|
|
/*!
|
|
@method
|
|
@abstract Writes numBits bits from value value to the LCD.
|
|
@discussion Writes numBists bits (the least significant) to the LCD control
|
|
data lines.
|
|
*/
|
|
void writeNbits(uint8_t value, uint8_t numBits);
|
|
|
|
/*!
|
|
@method
|
|
@abstract Pulse the LCD enable line (En).
|
|
@discussion Sends a pulse of 1 uS to the Enable pin to execute an command
|
|
or write operation.
|
|
*/
|
|
void pulseEnable();
|
|
|
|
uint8_t _rs_pin; // LOW: command. HIGH: character.
|
|
uint8_t _rw_pin; // LOW: write to LCD. HIGH: read from LCD.
|
|
uint8_t _enable_pin; // activated by a HIGH pulse.
|
|
uint8_t _data_pins[8]; // Data pins.
|
|
uint8_t _backlightPin; // Pin associated to control the LCD backlight
|
|
};
|
|
|
|
#endif
|