NewTextLCD.h

00001 /* mbed TextLCD Library, for a 4-bit LCD based on HD44780
00002  * Copyright (c) 2007-2010, sford, http://mbed.org
00003  *
00004  * Permission is hereby granted, free of charge, to any person obtaining a copy
00005  * of this software and associated documentation files (the "Software"), to deal
00006  * in the Software without restriction, including without limitation the rights
00007  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00008  * copies of the Software, and to permit persons to whom the Software is
00009  * furnished to do so, subject to the following conditions:
00010  *
00011  * The above copyright notice and this permission notice shall be included in
00012  * all copies or substantial portions of the Software.
00013  *
00014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00017  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00018  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00019  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
00020  * THE SOFTWARE.
00021  */
00022 
00023 #ifndef MBED_TEXTLCD_H
00024 #define MBED_TEXTLCD_H
00025 
00026 #include "mbed.h"
00027 
00028 /** A TextLCD interface for driving 4-bit HD44780-based LCDs
00029  *
00030  * Currently supports 16x2, 20x2 and 20x4 panels
00031  *
00032  * @code
00033  * #include "mbed.h"
00034  * #include "NewTextLCD.h"
00035  * 
00036  * TextLCD lcd(p10, p12, p13, p15, p16, p29, p30); // rs, e, d0-d3
00037  * 
00038  * int main() {
00039  *     lcd.printf("Hello mbed\n");
00040  *
00041  * //define user chars
00042  *  int pattern[8];
00043  *  int pattern1[8];
00044  *  pattern[0] = 1;              //     *
00045  *  pattern[1] = 3;              //    **
00046  *  pattern[2] = 5;              //   * *
00047  *  pattern[3] = 9;              //  *  *
00048  *  pattern[4] = 0x11;           // *   *     
00049  *  pattern[5] = 0x19;           // **  * 
00050  *  pattern[6] = 0x1d;           // *** *
00051  *  pattern[7] = 0x1f;           // *****
00052  *  
00053  *  pattern1[0] = 0x10;          // *
00054  *  pattern1[1] = 0x18;          // **
00055  *  pattern1[2] = 0x14;          // * *
00056  *  pattern1[3] = 0x12;          // *  *
00057  *  pattern1[4] = 0x11;          // *   *
00058  *  pattern1[5] = 0x13;          // *  **
00059  *  pattern1[6] = 0x17;          // * ***
00060  *  pattern1[7] = 0x1f;          // *****
00061  * 
00062  *  lcd.writeCGRAM(0, pattern);
00063  *  lcd.writeCGRAM(1, pattern1);
00064  *  
00065  *  lcd.locate(15,0);
00066  *  lcd.putc(0);   // user pattern 0
00067  *  lcd.putc(1);   // user pattern 1   
00068  * }
00069  * @endcode
00070  */
00071 class TextLCD : public Stream {
00072 public:
00073 
00074     /** LCD panel format */
00075     enum LCDType {
00076         LCD16x2     /**< 16x2 LCD panel (default) */
00077         , LCD16x2B  /**< 16x2 LCD panel alternate addressing */
00078         , LCD20x2   /**< 20x2 LCD panel */
00079         , LCD20x4   /**< 20x4 LCD panel */
00080         , LCD24x2   /**< 24x2 LCD panel */
00081         , LCDuser   /** User defined LCD, rows/columns must be set */
00082     };
00083 
00084     /** Create a TextLCD interface
00085      *
00086      * @param rs    Instruction/data control line
00087      * @param e     Enable line (clock)
00088      * @param d4-d7 Data lines
00089      * @param type  Sets the panel size/addressing mode (default = LCD16x2)
00090      */
00091     TextLCD(PinName rs, PinName e, PinName d4, PinName d5, PinName d6, PinName d7, LCDType type = LCD16x2);
00092 
00093  #if DOXYGEN_ONLY
00094     /** Write a character to the LCD
00095      *
00096      * @param c The character to write to the display
00097      */
00098     int putc(int c);
00099 
00100     /** Write a formated string to the LCD
00101      *
00102      * @param format A printf-style format string, followed by the
00103      *               variables to use in formating the string.
00104      */
00105     int printf(const char* format, ...);
00106  #endif
00107 
00108     /** Locate to a screen column and row
00109      *
00110      * @param column  The horizontal position from the left, indexed from 0
00111      * @param row     The vertical position from the top, indexed from 0
00112      */
00113     void locate(int column, int row);
00114 
00115     /** Clear the screen and locate to 0,0 */
00116     void cls();
00117     
00118     struct LCDparam {
00119       int rows;           // number of lines //
00120       int columns;        // number of columns //
00121       int delay;          // delay for commands microseconds //
00122       int adresses[4];    // start adresses for 4 lines //
00123     } LCDparam;
00124     
00125     /** write a user defined char
00126      *
00127      * @param address  The user defined char (0-7)
00128      * @param pattern[8] bit pattern 5*8 of char
00129      */ 
00130     void writeCGRAM(int address, int pattern[8]);
00131     
00132     /** Get the char at the current position
00133      * 
00134      * int getc() 
00135      */
00136      void writeCommand(int command);
00137    
00138 protected:
00139 
00140     // Stream implementation functions
00141     virtual int _putc(int value);
00142     virtual int _getc();
00143 
00144     int address(int column, int row);
00145     void character(int column, int row, int c);
00146     void writeByte(int value);
00147     void writeData(int data);
00148     void setLCDparam(LCDType _type);
00149     DigitalOut _rs, _e;
00150     BusOut _d;
00151     LCDType _type;
00152 
00153     int _column;
00154     int _row;
00155 };
00156 
00157 #endif