NewTextLCD.h

00001 /* mbed TextLCD Library, for a 4-bit LCD based on HD44780
00002  * Copyright (c) 2007-2010, sford, http://mbed.org
00003  * 2011-06-11 TP modified for Elmicro Testbed with display GDM4000D
00004  *
00005  * Permission is hereby granted, free of charge, to any person obtaining a copy
00006  * of this software and associated documentation files (the "Software"), to deal
00007  * in the Software without restriction, including without limitation the rights
00008  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00009  * copies of the Software, and to permit persons to whom the Software is
00010  * furnished to do so, subject to the following conditions:
00011  *
00012  * The above copyright notice and this permission notice shall be included in
00013  * all copies or substantial portions of the Software.
00014  *
00015  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00016  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00017  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00018  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00019  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00020  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
00021  * THE SOFTWARE.
00022  */
00023 
00024 #ifndef MBED_TEXTLCD_H
00025 #define MBED_TEXTLCD_H
00026 
00027 #include "mbed.h"
00028 
00029 /** A TextLCD interface for driving 4-bit HD44780-based LCDs
00030  *
00031  * Currently supports 16x2, 20x2 and 20x4 panels
00032  *
00033  * @code
00034  * #include "mbed.h"
00035  * #include "NewTextLCD.h"
00036  * 
00037  * TextLCD lcd(p26, p25, p24, p23, p22, p20, p19, TextLCD::LCD20x4); // rs, rw, e, d4-d7
00038  * 
00039  * int main() {
00040  *     lcd.printf("Hello mbed\n");
00041  *
00042  * //define user chars
00043  *  int pattern[8];
00044  *  int pattern1[8];
00045  *  pattern[0] = 1;              //     *
00046  *  pattern[1] = 3;              //    **
00047  *  pattern[2] = 5;              //   * *
00048  *  pattern[3] = 9;              //  *  *
00049  *  pattern[4] = 0x11;           // *   *     
00050  *  pattern[5] = 0x19;           // **  * 
00051  *  pattern[6] = 0x1d;           // *** *
00052  *  pattern[7] = 0x1f;           // *****
00053  *  
00054  *  pattern1[0] = 0x10;          // *
00055  *  pattern1[1] = 0x18;          // **
00056  *  pattern1[2] = 0x14;          // * *
00057  *  pattern1[3] = 0x12;          // *  *
00058  *  pattern1[4] = 0x11;          // *   *
00059  *  pattern1[5] = 0x13;          // *  **
00060  *  pattern1[6] = 0x17;          // * ***
00061  *  pattern1[7] = 0x1f;          // *****
00062  * 
00063  *  lcd.writeCGRAM(0, pattern);
00064  *  lcd.writeCGRAM(1, pattern1);
00065  *  
00066  *  lcd.locate(15,0);
00067  *  lcd.putc(0);   // user pattern 0
00068  *  lcd.putc(1);   // user pattern 1   
00069  * }
00070  * @endcode
00071  */
00072 class TextLCD : public Stream {
00073 public:
00074 
00075     /** LCD panel format */
00076     enum LCDType {
00077         LCD16x2     /**< 16x2 LCD panel (default) */
00078         , LCD16x2B  /**< 16x2 LCD panel alternate addressing */
00079         , LCD20x2   /**< 20x2 LCD panel */
00080         , LCD20x4   /**< 20x4 LCD panel */
00081         , LCD24x2   /**< 24x2 LCD panel */
00082         , LCDuser   /** User defined LCD, rows/columns must be set */
00083     };
00084 
00085     /** Create a TextLCD interface
00086      *
00087      * @param rs    Instruction/data control line
00088      * @param rw    R/W line
00089      * @param e     Enable line (clock)
00090      * @param d4-d7 Data lines
00091      * @param type  Sets the panel size/addressing mode (default = LCD16x2)
00092      */
00093     TextLCD(PinName rs, PinName rw, PinName e, PinName d4, PinName d5, PinName d6, PinName d7, LCDType type = LCD16x2);
00094 
00095  #if DOXYGEN_ONLY
00096     /** Write a character to the LCD
00097      *
00098      * @param c The character to write to the display
00099      */
00100     int putc(int c);
00101 
00102     /** Write a formated string to the LCD
00103      *
00104      * @param format A printf-style format string, followed by the
00105      *               variables to use in formating the string.
00106      */
00107     int printf(const char* format, ...);
00108  #endif
00109 
00110     /** Locate to a screen column and row
00111      *
00112      * @param column  The horizontal position from the left, indexed from 0
00113      * @param row     The vertical position from the top, indexed from 0
00114      */
00115     void locate(int column, int row);
00116 
00117     /** Clear the screen and locate to 0,0 */
00118     void cls();
00119     
00120     struct LCDparam {
00121       int rows;           // number of lines //
00122       int columns;        // number of columns //
00123       int delay;          // delay for commands microseconds //
00124       int adresses[4];    // start adresses for 4 lines //
00125     } LCDparam;
00126     
00127     /** write a user defined char
00128      *
00129      * @param address  The user defined char (0-7)
00130      * @param pattern[8] bit pattern 5*8 of char
00131      */ 
00132     void writeCGRAM(int address, int pattern[8]);
00133     
00134     /** Get the char at the current position
00135      * 
00136      * int getc() 
00137      */
00138      void writeCommand(int command);
00139    
00140 protected:
00141 
00142     // Stream implementation functions
00143     virtual int _putc(int value);
00144     virtual int _getc();
00145 
00146     int address(int column, int row);
00147     void character(int column, int row, int c);
00148     void writeByte(int value);
00149     void writeData(int data);
00150     void setLCDparam(LCDType _type);
00151     DigitalOut _rs, _rw, _e;
00152     BusOut _d;
00153     LCDType _type;
00154 
00155     int _column;
00156     int _row;
00157 };
00158 
00159 #endif