CRLiquidCrystal.h

// Copyright 2019 Josh Bailey (josh@vandervecken.com)

// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

// Minimally compatible with LiquidCrystal library. Does not use timers once initialized (so can be interrupted).

#ifndef CRLiquidCrystal_h
#define CRLiquidCrystal_h

// cppcheck-suppress missingIncludeSystem
#include <inttypes.h>
// cppcheck-suppress missingInclude
#include "Arduino.h"

#define LCD_CLEARDISPLAY 0x01
#define LCD_RETURNHOME 0x02
#define LCD_ENTRYMODESET 0x04
#define LCD_DISPLAYCONTROL 0x08
#define LCD_CURSORSHIFT 0x10
#define LCD_FUNCTIONSET 0x20
#define LCD_SETDDRAMADDR 0x80

#define LCD_ENTRYRIGHT 0x00
#define LCD_ENTRYLEFT 0x02
#define LCD_ENTRYSHIFTINCREMENT 0x01
#define LCD_ENTRYSHIFTDECREMENT 0x00

#define LCD_DISPLAYON 0x04
#define LCD_CURSORON 0x02
#define LCD_CURSOROFF 0x00
#define LCD_BLINKOFF 0x00

#define LCD_DISPLAYMOVE 0x08
#define LCD_CURSORMOVE 0x00
#define LCD_MOVERIGHT 0x04
#define LCD_MOVELEFT 0x00

#define LCD_4BITMODE 0x00
#define LCD_2LINE 0x08
#define LCD_5x8DOTS 0x00


class CRLiquidCrystal {
public:
  CRLiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable,
    uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3);
  void begin();
  void clear();
  void setCursor(uint8_t, uint8_t);
  void write(uint8_t);
private:
  void command(uint8_t);
  void send(uint8_t, uint8_t);
  void writelow4(uint8_t);
  void writehigh4(uint8_t);
  void enablePulse();
  void waitFree();
  uint8_t _rs_pin;
  uint8_t _rw_pin;
  uint8_t _enable_pin;
  uint8_t _busy_pin;
  uint8_t _data_pins[4];
};

#endif