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Arduino/libraries/hd44780/hd44780.h
Jérôme Delacotte 7b30d6e298 first commit
2025-03-06 11:15:32 +01:00

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// vi:ts=4
// -------------------------------------------------------------------------
// hd44780.h - hd44780 base class
// Copyright (c) 2014-2020 Bill Perry
// (Derivative work of arduino.cc IDE LiquidCrystal library)
// Note:
// Original Copyrights for LiquidCrystal are a mess as originally none were
// specified, but in Nov 2015 these have appeared so they are included:
//
// Copyright (C) 2006-2008 Hans-Christoph Steiner. All rights reserved.
// Copyright (c) 2010 Arduino LLC. All right reserved.
//
// See licenseInfo.txt for a history of the copyrights of LiquidCrystal
// --------------------------------------------------------------------------
//
// This file is part of the hd44780 library
//
// hd44780 is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation version 3 of the License.
//
// hd44780 is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with hd44780. If not, see <http://www.gnu.org/licenses/>.
//
// See the license.txt file for further licensing & copyright details.
// -----------------------------------------------------------------------
//
// hd44780 is an extensible LCD library for hd44780 based LCD displays.
// The library consists of a hd44780 base class combined with one or more
// i/o subclasses to perform the i/o communication between the host and the
// hd44780 display interface.
//
// The API functionality provided by the hd44780 base class, when combined
// with an hd44780 library i/o subclass, is compatible with the API
// functionality of the Arduino LiquidCrystal library as well as compatibilty
// with most of the LCD API 1.0 Specification (nearly obsolete).
//
// The hd44780 API also provides some addtional extensions and all the API
// functions provided by hd44780 are common across all i/o subclasses.
//
// -----------------------------------------------------------------------
// History
//
// 2020-11-14 bperrybap - created internal command4bit() for begin() function
// 2019.08.11 bperrybap - support for 1 and 2 lines in setRowOffsets()
// 2018.03.23 bperrybap - bumped default instruction time from 37us to 38us
// 2017.12.23 bperrybap - added LCD API 1.0 init() function
// 2017.12.23 bperrybap - allow write() to use 0 as a value without cast
// 2017.05.11 bperrybap - added auto linewrap functionality
// 2016.12.26 bperrybap - new BUSY error status, new constructors
// 2016.09.08 bperrybap - changed param order of iowrite() to match ioread()
// 2016.08.06 bperrybap - changed iosend() to iowrite()
// 2016.08.06 bperrybap - added status() and read()
// 2016.07.27 bperrybap - added return status to command() and iosend()
// 2016.07.20 bperrybap - merged hd44780 base class and i/o classes into a
// single library.
//
// 2016.06.08 bperrybap - removed pre 1.0 support
// 2016.06.03 bperrybap - added smart execution delays
// 2016.05.14 bperrybap - added LCD 1.0 API functions
// 2016.05.05 bperrybap - added support for 8 bit mode
// 2014.02.15 bperrybap - initial creation
//
// @author Bill Perry - bperrybap@opensource.billsworld.billandterrie.com
//
// ------------------------------------------------------------------------
#ifndef hd44780_h
#define hd44780_h
#if (ARDUINO < 100) && !defined(MPIDE)
#error hd44780 library requires Arduino 1.0 or later
#endif
#include <Arduino.h>
#include <inttypes.h>
#include <Print.h>
#define HD44780_VERSION 10302
#define HD44780_VERSIONSTR "1.3.2"
class hd44780 : public Print
{
public:
hd44780();
hd44780(uint8_t cols, uint8_t rows);
hd44780(uint8_t cols, uint8_t rows, uint32_t chExecTime, uint32_t insExecTime);
// default execute times in us for clear/home and instructions/data
// The hd44780 spec uses 1520 and 37 in table 6 page 24
// note: the spec does not specify the time for Clear display
// 38us is used vs 37 as 37 had issues on VERY fast processors that could
// send data to the LCD that fast.
// these can be overridden using setExecTimes(chUs, insUs)
static const int HD44780_CHEXECTIME = 2000; // time in us for clear&home
static const int HD44780_INSEXECTIME = 38;
// API return values
// 0 means successful, less than zero means unsuccessful
static const int RV_ENOERR=0; // no error. Do not change!
static const int RV_EIO=-1; // i/o operation failed (generic/default error)
static const int RV_EINVAL=-2; // invalid argument/parameter
static const int RV_ENOTSUP=-3; // not supported
static const int RV_ENXIO=-4; // no such device or address
static const int RV_EMSGSIZE=-5; // Message/data too long
static const int RV_EBUSY=-6; // device is unexpectedly BUSY
// commands
static const uint8_t HD44780_CLEARDISPLAY = 0x01;
static const uint8_t HD44780_RETURNHOME = 0x02;
static const uint8_t HD44780_ENTRYMODESET = 0x04;
static const uint8_t HD44780_DISPLAYCONTROL = 0x08;
static const uint8_t HD44780_CURDISPSHIFT = 0x10;
static const uint8_t HD44780_FUNCTIONSET = 0x20;
static const uint8_t HD44780_SETCGRAMADDR = 0x40;
static const uint8_t HD44780_SETDDRAMADDR = 0x80;
// flags for entry mode set;
static const uint8_t HD44780_ENTRYLEFT2RIGHT = 0x02;
static const uint8_t HD44780_ENTRYAUTOSHIFT = 0x01;
// flags for display on/off control;
static const uint8_t HD44780_DISPLAYON = 0x04;
// static const uint8_t HD44780_DISPLAYOFF = 0x00;
static const uint8_t HD44780_CURSORON = 0x02;
static const uint8_t HD44780_CURSOROFF = 0x00;
static const uint8_t HD44780_BLINKON = 0x01;
static const uint8_t HD44780_BLINKOFF = 0x00;
// flags for cursor/display shift;
static const uint8_t HD44780_DISPLAYMOVE = 0x08;
static const uint8_t HD44780_CURSORMOVE = 0x00;
static const uint8_t HD44780_MOVERIGHT = 0x04;
static const uint8_t HD44780_MOVELEFT = 0x00;
// flags for function set;
static const uint8_t HD44780_8BITMODE = 0x10;
static const uint8_t HD44780_4BITMODE = 0x00;
static const uint8_t HD44780_2LINE = 0x08;
static const uint8_t HD44780_1LINE = 0x00;
static const uint8_t HD44780_5x10DOTS = 0x04;
static const uint8_t HD44780_5x8DOTS = 0x00;
// Print class println() function is not supported
// catch it and print an error
size_t __attribute__ ((error("println() is not supported"))) println(const __FlashStringHelper *);
size_t __attribute__ ((error("println() is not supported"))) println(const String &s);
size_t __attribute__ ((error("println() is not supported"))) println(const char[]);
size_t __attribute__ ((error("println() is not supported"))) println(char);
size_t __attribute__ ((error("println() is not supported"))) println(unsigned char, int = DEC);
size_t __attribute__ ((error("println() is not supported"))) println(int, int = DEC);
size_t __attribute__ ((error("println() is not supported"))) println(unsigned int, int = DEC);
size_t __attribute__ ((error("println() is not supported"))) println(long, int = DEC);
size_t __attribute__ ((error("println() is not supported"))) println(unsigned long, int = DEC);
size_t __attribute__ ((error("println() is not supported"))) println(double, int = 2);
#ifdef Printable_h
size_t __attribute__ ((error("println() is not supported"))) println(const Printable&);
#endif
size_t __attribute__ ((error("println() is not supported"))) println(void);
// ALL API calls return a status.
// This is a change to existing APIs like
// LiquidCrystal and LCD API 1.0
// but should be compatible with existing code.
//
// Unless otherwise documented,
// A less than zero status means the API call was not successful
// Arduino IDE LiquidCrystal lib functions
// =======================================
// begin()
// returns 0 on success, non zero on initalization failure
int begin(uint8_t cols, uint8_t rows, uint8_t charsize = HD44780_5x8DOTS);
#if 0
// init ()
// This version will NEVER be implemented in this class as it is
// not conformant to LCD API 1.0 and is hardware i/o specific
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);
#endif
int clear();
int home();
int setCursor(uint8_t col, uint8_t row);
size_t write(uint8_t value); // does char & line processing
size_t _write(uint8_t value); // does not do char & line processing
// write() overloads for 0 or null which is an int
// This is only because Print class doesn't do it.
inline size_t write(unsigned int value) { return(write((uint8_t)value)); }
inline size_t write(int value) { return(write((uint8_t)value)); }
inline size_t _write(unsigned int value) { return(_write((uint8_t)value)); }
inline size_t _write(int value) { return(_write((uint8_t)value)); }
using Print::write; // for other Print Class write() functions
int cursor();
int noCursor();
int blink();
int noBlink();
int display(); // turn on LCD pixels
int noDisplay(); // turn off LCD pixels
int scrollDisplayLeft();
int scrollDisplayRight();
int autoscroll(); // auto horizontal scrolling
int noAutoscroll(); // no auto horizontal scrolling
int leftToRight();
int rightToLeft();
int createChar(uint8_t charval, uint8_t charmap[]); // no PROGMEM
int moveCursorLeft();
int moveCursorRight();
// sets memory address for each row, added in IDE 1.6.0
// hd44780 allows calls with 1, 2, 3, or 4 offsets
int setRowOffsets(int row0, int row1=0, int row2=0, int row3=0);
// Mandatory LCD API 1.0 functions
// ================================
int init(); // uses defaults; using begin(cols, rows) is recommended
#if ( __GNUC__ >= 4) && (__GNUC_MINOR__ >= 5)
inline void __attribute__((deprecated("Use setExecTimes() instead"))) setDelay(uint32_t CmdDelay, uint32_t CharDelay)
{setExecTimes(CmdDelay, CharDelay);}
#else
inline void __attribute__((deprecated)) setDelay(uint32_t CmdDelay, uint32_t CharDelay)
{setExecTimes(CmdDelay, CharDelay);}
#endif
// command()
// returns 0 on success, non zero on command failure
int command(uint8_t);
#if 0
// setCursor()
// MAJOR PROBLEM:
// The LiquidCrystal API defines this as setCursor(col, row);
// This is fundamentally incompatible with this defintion.
// there is no way to fix this.
// The LiquidCrytal API is in wide spread use so it wins.
// any LCD API 1.0 code will have to be fixed to deal wth this.
// A quick and dirty way to work around this to define a macro
// to flip the parameters:
// #define setCursor(_row, _col) setCursor(_col, _row)
// and place it just after the #include for the library
void setCursor(uint8_t row, uint8_t col);
#endif
// cursor_on()
// cursor_off()
// blink_on()
// blink_off()
// These functions should be considered obsolete as LiquidCrytal API has
// api functions for these that are in wide spread use.
// note: only very new versions of gcc support setting warning message
// it breaks on on older versions that shipped with older 1.x IDEs
// so test for gcc 4.5 or greater for better deprecated messages
#if ( __GNUC__ >= 4) && (__GNUC_MINOR__ >= 5)
inline int __attribute__((deprecated("Use cursor() instead"))) cursor_on() {return(cursor());}
inline int __attribute__((deprecated("Use noCursor() instead"))) cursor_off() {return(noCursor());}
inline int __attribute__((deprecated("Use blink() instead"))) blink_on() {return(blink());}
inline int __attribute__((deprecated("Use noBlink() instead"))) blink_off() { return(noBlink());}
#else
inline int __attribute__((deprecated)) cursor_on() {return(cursor());}
inline int __attribute__((deprecated)) cursor_off() {return(noCursor());}
inline int __attribute__((deprecated)) blink_on() {return(blink());}
inline int __attribute__((deprecated)) blink_off() { return(noBlink());}
#endif
// optional LCD API 1.0 functions
// ==============================
inline int setBacklight(uint8_t dimvalue) {return(iosetBacklight(dimvalue));}
inline int setContrast(uint8_t contvalue) {return(iosetContrast(contvalue));}
int on(void); // turn on LCD pixels and backlight
int off(void); // turn off LCD pixels and backlight
// status();
// The LCD API 1.0 documenation says it does not work the same
// on all devices.
// On one device it returns some sort of fifo status.
// the documenation isn't clear what it should do on other h/w.
// hd44780 mandates that all API functions work the same for all
// i/o subclasses.
//
// returns:
// success: 8 bit hd44780 status byte read from LCD (busy flag & address)
// failure: negataive value (error or read/status not supported)
int status();
// extended LCD API 1.0 functions
// ==============================
// load_custom_character()
// this function should be considered obsolete as LiquidCrystal API has
// a createChar() function that is in wide spread use
// LCD API documentation for this call says 7 byte array
// but it is really 8 bytes per custom char
// note: only very new versions of gcc support setting warning message
// it breaks on on older versions that shipped with older 1.x IDEs
// so test for gcc 4.5 or greater for better deprecated messages
#if ( __GNUC__ >= 4) && (__GNUC_MINOR__ >= 5)
inline void __attribute__((deprecated("Use createChar() instead")))
load_custom_character(uint8_t Char_Num, uint8_t Rows[]) {createChar(Char_Num, Rows); }
#else
inline void __attribute__((deprecated))
load_custom_character(uint8_t Char_Num, uint8_t Rows[]) {createChar(Char_Num, Rows); }
#endif
#if 0
// This will NEVER be implemented in this class as it is very h/w specific
uint8_t keypad(); // not implemented
#endif
// Additional API functions
// These are hd44780 lib extensions that are
// not part of LCD 1.0 or LiquidCrystal
// note:
// status() exists in LCD 1.0 API but is different
// hd44780 status() function will be consistent across all i/o subclasses
// ===================================================================
int backlight(void); // turn on Backlight (max brightness)
int noBacklight(void); // turn off Backlight
// PROGMEM is wreck on AVR, as there is no way to detect its use.
// for now:
// hd44780 assumes that const stores data in flash and
// on processors that use/need PROGMEM it must be used on the declaration
inline int createChar(uint8_t charval, char charmap[]) // does not assume PROGMEM
{ return(createChar(charval, (uint8_t *) charmap)); }
// on processors that don't use/need PROGMEM it can be left off the declaration
int createChar(uint8_t charval, const uint8_t charmap[]); // assumes PROGMEM
// this function is for compatibilty with other libraries like fm's newliquidCrystal
inline int createChar(uint8_t charval, const char charmap[]) // assumes PROGMEM
{ return(createChar(charval, (const uint8_t *) charmap)); }
int read(void);
// enable automatic line wrapping (only works in left 2 right mode)
int lineWrap(void) { if(_displaymode & HD44780_ENTRYLEFT2RIGHT) {_wraplines=1; return(RV_ENOERR);}else{return(RV_ENOTSUP);}}
// disable automatic line wrapping
int noLineWrap(void){ _wraplines=0; return(RV_ENOERR);}; // turn off automatic line wrapping
// set execution times for commmands to override defaults
inline void setExecTimes(uint32_t chExecTimeUs, uint32_t insExecTimeUs)
{ _chExecTime = chExecTimeUs; _insExecTime = insExecTimeUs;}
// A few undocumented helper functions for the included examples
static int blinkLED(int blinks); // blink a built in LED if possible
static void fatalError(int errcode); // hang in loop blinking error code
protected:
// type of data being sent through ioread()/iowrite()
// IOcmd - read/write an 8 bit status/command to/from display
// IOdata - read/writes 8 bits of data to/from display
// IOcmd4bit - write D4-d7 cmd bits to display using a single EN strobe
// 8 bit host interfaces can treate this same as IOcmd
enum iotype {HD44780_IOcmd, HD44780_IOdata, HD44780_IOcmd4bit};
uint8_t _displayfunction;
uint8_t _displaycontrol;
uint8_t _displaymode;
uint8_t _cols;
uint8_t _rows;
// wait for lcd to be ready
inline void waitReady() {_waitReady((_startTime), _execTime);}
inline void waitReady(int32_t offsetUs) {_waitReady((_startTime+offsetUs), _execTime);}
inline void _waitReady(uint32_t _stime, uint32_t _etime)
{while(( ((uint32_t)micros()) - _stime) < _etime){}}
private:
uint8_t _curcol; // current LCD col if doing char & line processing
uint8_t _currow; // current LCD row if doing char & line processing
uint8_t _wraplines; // set to nonzero if wrapping long lines
// i/o subclass functions
virtual int ioinit() {return 0;} // optional - successful if not implemented
virtual int ioread(hd44780::iotype type) {if(type) return(RV_ENOTSUP);else return(RV_ENOTSUP);} // optional, return fail if not implemented
virtual int iowrite(hd44780::iotype type, uint8_t value)=0;// mandatory
virtual int iosetBacklight(uint8_t dimvalue){if(dimvalue) return(RV_ENOTSUP); else return(RV_ENOTSUP);} // optional
virtual int iosetContrast(uint8_t contvalue){if(contvalue) return(RV_ENOTSUP); else return(RV_ENOTSUP);}// optional
uint8_t _rowOffsets[4]; // memory address of start of each row/line
// stuff for tracking execution times
inline void markStart(uint32_t exectime) { _startTime = (uint32_t) micros(); _execTime = exectime;}
uint32_t _chExecTime; // time in Us of execution time for clear/home
uint32_t _insExecTime; // time in Us of execution time for instructions or data
uint32_t _startTime; // 'start' time of last thing sent to LCD (cmd or data)
uint32_t _execTime; // execution time in Us of last thing sent to LCD (cmd or data)
// internal API function to send only upper 4 bits of byte on LCD DB4 to DB7 pins
int command4bit(uint8_t value)
{
int status = iowrite(HD44780_IOcmd4bit, value);
markStart(_insExecTime);
return(status);
}
};
// LED_BUILTIN define fixups for Teensy, ChipKit, ESP8266, ESP32 cores
#if !defined(LED_BUILTIN)
#if defined(CORE_TEENSY)
#define LED_BUILTIN CORE_LED0_PIN
#elif defined(ARDUINO_ARCH_ESP8266)
#define LED_BUILTIN BUILTIN_LED
// this is for cores that incorrectly used BUILTIN_LED instead of LED_BUILTIN
// esp32 core does this, they have LED_BUILTIN but it is a const not a define
// this works around that.
#elif defined(BUILTIN_LED)
#define LED_BUILTIN BUILTIN_LED
// special check for pre 1.0.6 IDEs that didn't define LED_BUILTIN
#elif (ARDUINO < 106 ) && ( defined(__AVR_ATmega328__) || defined(__AVR_ATmega328P__) || defined(__AVR_ATmega32U4__))
#define LED_BUILTIN 13 // IDE bundled AVR boards use pin 13 for builtin led
#elif defined(PIN_LED1) // chipkit
#define LED_BUILTIN PIN_LED1
#endif
#endif
// endif for header guard
#endif
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