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141 lines
3.8 KiB
C++
141 lines
3.8 KiB
C++
#ifndef ShiftLCD_h
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#define ShiftLCD_h
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/**
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* This is a modified version of the standard LiquidCrystal class that
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* ships with the Arduino software.
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*
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* It has been modified to work with either one or two eight bit shift registers
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* in 4 and 8 bit mode respectivly
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*
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* The original file was released under the LGPL licence which I have to confess
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* I found more than a little confusing. I belive that I am obligated to release
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* this software under the GPL licence, as it is a derivitive work:
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* (if not, I am very sorry and please tell me what I should hve done)
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*
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*******************************************************************************
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ShiftLCD, allows the HD44780 LCD to be opertaed via a shift register
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Copyright (C) 2010 Chris Parish
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*******************************************************************************
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* Please see the example files for usage information
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*/
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#include <inttypes.h>
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#include "Print.h"
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// commands
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#define LCD_CLEARDISPLAY 0x01
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#define LCD_RETURNHOME 0x02
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#define LCD_ENTRYMODESET 0x04
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#define LCD_DISPLAYCONTROL 0x08
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#define LCD_CURSORSHIFT 0x10
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#define LCD_FUNCTIONSET 0x20
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#define LCD_SETCGRAMADDR 0x40
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#define LCD_SETDDRAMADDR 0x80
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// flags for display entry mode
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#define LCD_ENTRYRIGHT 0x00
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#define LCD_ENTRYLEFT 0x02
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#define LCD_ENTRYSHIFTINCREMENT 0x01
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#define LCD_ENTRYSHIFTDECREMENT 0x00
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// flags for display on/off control
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#define LCD_DISPLAYON 0x04
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#define LCD_DISPLAYOFF 0x00
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#define LCD_CURSORON 0x02
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#define LCD_CURSOROFF 0x00
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#define LCD_BLINKON 0x01
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#define LCD_BLINKOFF 0x00
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// flags for display/cursor shift
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#define LCD_DISPLAYMOVE 0x08
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#define LCD_CURSORMOVE 0x00
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#define LCD_MOVERIGHT 0x04
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#define LCD_MOVELEFT 0x00
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// flags for function set
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#define LCD_8BITMODE 0x10
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#define LCD_4BITMODE 0x00
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#define LCD_2LINE 0x08
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#define LCD_1LINE 0x00
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#define LCD_5x10DOTS 0x04
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#define LCD_5x8DOTS 0x00
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// pins for functional output
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#define LCD_RS_PIN 0x01
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#define LCD_EN_PIN 0x02
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#define LCD_BL_PIN 0x04
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/*
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ShiftLCD Class
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*/
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class ShiftLCD: public Print {
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public:
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ShiftLCD(uint8_t dp, uint8_t cp, uint8_t lp, uint8_t mode = 4);
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void init(uint8_t dp, uint8_t cp, uint8_t lp, uint8_t mode);
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void begin(uint8_t cols, uint8_t rows, uint8_t charsize = LCD_5x8DOTS);
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void clear();
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void home();
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void noDisplay();
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void display();
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void noBlink();
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void blink();
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void noCursor();
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void cursor();
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void scrollDisplayLeft();
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void scrollDisplayRight();
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void leftToRight();
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void rightToLeft();
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void autoscroll();
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void noAutoscroll();
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void backlightOn();
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void backlightOff();
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void createChar(uint8_t, uint8_t[]);
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void setCursor(uint8_t, uint8_t);
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virtual void write(uint8_t);
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void command(uint8_t);
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private:
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void updateBacklight();
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void send(uint8_t, uint8_t);
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void write4bits(uint8_t, uint8_t);
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void write8bits(uint8_t, uint8_t);
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uint8_t _clock_pin; //shift register clock pin
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uint8_t _data_pin; //shift register data pin
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uint8_t _latch_pin; //shift register latch pin
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uint8_t _smart_enable;
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uint8_t _displayfunction;
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uint8_t _displaycontrol;
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uint8_t _displaymode;
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uint8_t _backlight;
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uint8_t _initialized;
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uint8_t _numlines,_currline;
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};
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#endif
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