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LCD Library 1.1.7
LCD Library - LCD control class hierarchy library. Drop in replacement for the LiquidCrystal Library.
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00001 // --------------------------------------------------------------------------- 00002 // Created by Francisco Malpartida on 20/08/11. 00003 // Copyright 2011 - Under creative commons license 3.0: 00004 // Attribution-ShareAlike CC BY-SA 00005 // 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: No 00010 // Extendable: Yes 00011 // 00012 // @file LiquidCrystal_SR.h 00013 // 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 the 00018 // LCD library. 00019 // 00020 // The functionality provided by this class and its base class is identical 00021 // to the original functionality of the Arduino LiquidCrystal library and can 00022 // be used as such. 00023 // 00024 // Modified to work serially with the shiftOut() function, an 8-bit 00025 // 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 zero 00034 // Bit #1 - N/C 00035 // Bit #2 - connects to RS (Register Select) on the LCD 00036 // 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) Enable 00040 // If not using Enable, the Data pin is used for the enable signal by defining 00041 // the same pin for Enable as for Data. Data and Clock outputs/pins goes to 00042 // the shiftregister. 00043 // LCD RW-pin hardwired to LOW (only writing to LCD). 00044 // Busy Flag (BF, data bit D7) is not read. 00045 // 00046 // Original project homepage: http://code.google.com/p/arduinoshiftreglcd/ 00047 // 00048 // 00049 // History 00050 // 2011.10.29 fmalpartida - adaption of the library to the LCD class hierarchy. 00051 // 2011.07.02 Fixed a minor flaw in setCursor function. No functional change, 00052 // just a bit more memory efficient. 00053 // Thanks to CapnBry (from google code and github) who noticed it. 00054 // URL to his version of shiftregLCD: 00055 // https://github.com/CapnBry/HeaterMeter/commit/c6beba1b46b092ab0b33bcbd0a30a201fd1f28c1 00056 // 2009.07.30 raron - minor corrections to the comments. 00057 // Fixed timing to datasheet safe. Fixed keyword highlights. 00058 // 2009.07.28 Mircho / raron - a new modification to the schematics, and a 00059 // more streamlined interface 00060 // 2009.07.27 Thanks to an excellent suggestion from mircho at the Arduiono 00061 // playgrond forum, the number of wires now required is only two! 00062 // 2009.07.25 raron - Fixed comments. I really messed up the comments before 00063 // posting this, so I had to fix it. 00064 // Renamed a function, but no improvements or functional changes. 00065 // 2009.07.23 Incorporated some proper initialization routines 00066 // inspired (lets say copy-paste-tweaked) from LiquidCrystal 00067 // library improvements from LadyAda. 00068 // 2009.05.23 raron - first version, but based mostly (as in almost verbatim) 00069 // on the "official" LiquidCrystal library. 00070 // 00071 // 00072 // This library is only compatible with Arduino's SDK version 1.0 00073 // 00074 // 00075 // @author F. Malpartida - fmalpartida@gmail.com 00076 // --------------------------------------------------------------------------- 00077 #ifndef _LIQUIDCRYSTAL_SR_ 00078 #define _LIQUIDCRYSTAL_SR_ 00079 00080 #include <inttypes.h> 00081 #include <LCD.h> 00082 00083 00084 // two-wire indicator constant 00085 // --------------------------------------------------------------------------- 00086 #define TWO_WIRE 204 00087 #define SR_RS_BIT 0x04 00088 #define SR_EN_BIT 0x80 00089 00090 class LiquidCrystal_SR : public LCD 00091 { 00092 public: 00104 LiquidCrystal_SR ( uint8_t srdata, uint8_t srclock, uint8_t enable ); 00105 00118 virtual void begin(uint8_t cols, uint8_t rows, uint8_t charsize = LCD_5x8DOTS); 00119 00132 virtual void send(uint8_t value, uint8_t mode); 00133 00134 00135 private: 00136 00142 void init ( uint8_t srdata, uint8_t srclock, uint8_t enable, uint8_t lines, 00143 uint8_t font ); 00149 void write4bits ( uint8_t ); 00150 00151 uint8_t _srdata_pin; // Serial Data pin 00152 uint8_t _srclock_pin; // Clock Pin 00153 uint8_t _enable_pin; // Enable Pin 00154 uint8_t _two_wire; // two wire mode 00155 }; 00156 00157 #endif 00158