![]() | LCD Library 1.2.1 LCD Library - LCD control class hierarchy library. Drop in replacement for the LiquidCrystal Library. |
00001 // ---------------------------------------------------------------------------00002 // Created by Francisco Malpartida on 20/08/11.00003 // Copyright 2011 - Under creative commons license 3.0:00004 // Attribution-ShareAlike CC BY-SA00005 //00006 // This software is furnished "as is", without technical support, and with no 00007 // warranty, express or implied, as to its usefulness for any purpose.00008 //00009 // Thread Safe: No00010 // Extendable: Yes00011 //00012 // @file LiquidCrystal_SR.h00013 // Connects an LCD using 2 or 3 pins from the Arduino, via an 8-bit 00014 // ShiftRegister (SR from now on).00015 // 00016 // @brief 00017 // This is a port of the ShiftRegLCD library from raron and ported to the00018 // LCD library.00019 //00020 // The functionality provided by this class and its base class is identical00021 // to the original functionality of the Arduino LiquidCrystal library and can00022 // be used as such.00023 //00024 // Modified to work serially with the shiftOut() function, an 8-bit00025 // unlatched, no-tristate, unidirectional SIPO (Serial-In-Parallel-Out)00026 // shift register (IE a very simple SR), and an LCD in 4-bit mode.00027 // Any such shift register should do (pref. 74LS family IC's for 2-wire).00028 // I used 74LS164, for the reason that's what I had at hand.00029 //00030 // Connection description:00031 //00032 // SR output:00033 // Bit #0 - N/C - not connected, used to hold a zero00034 // Bit #1 - N/C00035 // Bit #2 - connects to RS (Register Select) on the LCD00036 // Bits #3-6 - connects to LCD data inputs D4 - D7.00037 // Bit #7 - enables the LCD enable-puls (via the diode-resistor AND "gate")00038 //00039 // 2 or 3 Pins required from the Arduino for Data, Clock and (optional) Enable00040 // If not using Enable, the Data pin will be used for the enable signal.00041 // 2 wire mode can be indicated by:00042 // - ommitting the enable pin in constructor00043 // - defining the same pin for Enable as for Data in constructor00044 // - by using the token TWO_WIRE for the enable pin.00045 //00046 // Data and Clock outputs/pins goes to the shiftregister.00047 // LCD RW-pin hardwired to LOW (only writing to LCD).00048 // Busy Flag (BF, data bit D7) is not read.00049 //00050 // Original project homepage: http://code.google.com/p/arduinoshiftreglcd/00051 //00052 //00053 // History00054 // 2012.03.29 bperrybap - can now eliminate enable pin in constructor for two wire mode.00055 // 2011.10.29 fmalpartida - adaption of the library to the LCD class hierarchy.00056 // 2011.07.02 Fixed a minor flaw in setCursor function. No functional change, 00057 // just a bit more memory efficient.00058 // Thanks to CapnBry (from google code and github) who noticed it.00059 // URL to his version of shiftregLCD:00060 // https://github.com/CapnBry/HeaterMeter/commit/c6beba1b46b092ab0b33bcbd0a30a201fd1f28c100061 // 2009.07.30 raron - minor corrections to the comments.00062 // Fixed timing to datasheet safe. Fixed keyword highlights.00063 // 2009.07.28 Mircho / raron - a new modification to the schematics, and a00064 // more streamlined interface00065 // 2009.07.27 Thanks to an excellent suggestion from mircho at the Arduiono 00066 // playgrond forum, the number of wires now required is only two!00067 // 2009.07.25 raron - Fixed comments. I really messed up the comments before 00068 // posting this, so I had to fix it.00069 // Renamed a function, but no improvements or functional changes.00070 // 2009.07.23 Incorporated some proper initialization routines00071 // inspired (lets say copy-paste-tweaked) from LiquidCrystal00072 // library improvements from LadyAda.00073 // 2009.05.23 raron - first version, but based mostly (as in almost verbatim)00074 // on the "official" LiquidCrystal library.00075 //00076 //00077 //00078 // @author F. Malpartida - fmalpartida@gmail.com00079 // ---------------------------------------------------------------------------00080 #ifndef _LIQUIDCRYSTAL_SR_00081 #define _LIQUIDCRYSTAL_SR_00082 00083 #include <inttypes.h>00084 #include "LCD.h"00085 #include "FastIO.h"00086 00087 00088 // two-wire indicator constant00089 // ---------------------------------------------------------------------------00090#define TWO_WIRE 20400091#define SR_RS_BIT 0x0400092#define SR_EN_BIT 0x8000093 00094class LiquidCrystal_SR : publicLCD00095 { 00096 public: 00108 LiquidCrystal_SR ( uint8_t srdata, uint8_t srclock, uint8_t enable=TWO_WIRE ); 00109 00122 virtualvoidsend(uint8_t value, uint8_t mode); 00123 00124 00134 voidsetBacklightPin ( uint8_t pin, t_backlighPol pol ); 00135 00145 voidsetBacklight ( uint8_t mode ); 00146 00147 private: 00148 00154 void init ( uint8_t srdata, uint8_t srclock, uint8_t enable, uint8_t lines, 00155 uint8_t font ); 00156 00161 void shiftIt (uint8_t val); 00162 00163 uint8_t _enable_pin; // Enable Pin00164 uint8_t _two_wire; // two wire mode00165 00166 fio_register _srDataRegister; // Serial Data pin00167 fio_bit _srDataBit; 00168 fio_register _srClockRegister; // Clock Pin00169 fio_bit _srClockBit; 00170 fio_register _srEnableRegister; // Enable Pin00171 fio_bit _srEnableBit; 00172 00173 }; 00174 00175 #endif00176