private Library copy of TextLCD
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TextLCD.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 /* 00024 * Comment: Added support for LCD40x2 and LCD8x2 00025 * Name: davervw 00026 * Date: 02/26/2011 00027 */ 00028 00029 #ifndef MBED_TEXTLCD_H 00030 #define MBED_TEXTLCD_H 00031 00032 #include "mbed.h" 00033 00034 /** A TextLCD interface for driving 4-bit HD44780-based LCDs 00035 * 00036 * Currently supports 16x2, 20x2, 20x4, 40x2, and 8x2 panels 00037 * 00038 * @code 00039 * #include "mbed.h" 00040 * #include "TextLCD.h" 00041 * 00042 * TextLCD lcd(p10, p12, p15, p16, p29, p30); // rs, e, d4-d7 00043 * 00044 * int main() { 00045 * lcd.printf("Hello World!\n"); 00046 * } 00047 * @endcode 00048 */ 00049 class TextLCD : public Stream { 00050 public: 00051 00052 /** LCD panel format */ 00053 enum LCDType { 00054 LCD16x2 /**< 16x2 LCD panel (default) */ 00055 , LCD16x2B /**< 16x2 LCD panel alternate addressing */ 00056 , LCD20x2 /**< 20x2 LCD panel */ 00057 , LCD20x4 /**< 20x4 LCD panel */ 00058 , LCD40x2 /**< 40x2 LCD panel */ 00059 , LCD8x2 /**< 8x2 LCD panel */ 00060 }; 00061 00062 /** Create a TextLCD interface 00063 * 00064 * @param rs Instruction/data control line 00065 * @param e Enable line (clock) 00066 * @param d4-d7 Data lines for using as a 4-bit interface 00067 * @param type Sets the panel size/addressing mode (default = LCD16x2) 00068 */ 00069 TextLCD(PinName rs, PinName e, PinName d4, PinName d5, PinName d6, PinName d7, LCDType type = LCD16x2); 00070 00071 #if DOXYGEN_ONLY 00072 /** Write a character to the LCD 00073 * 00074 * @param c The character to write to the display 00075 */ 00076 int putc(int c); 00077 00078 /** Write a formated string to the LCD 00079 * 00080 * @param format A printf-style format string, followed by the 00081 * variables to use in formating the string. 00082 */ 00083 int printf(const char* format, ...); 00084 #endif 00085 00086 /** Locate to a screen column and row 00087 * 00088 * @param column The horizontal position from the left, indexed from 0 00089 * @param row The vertical position from the top, indexed from 0 00090 */ 00091 void locate(int column, int row); 00092 00093 /** Clear the screen and locate to 0,0 */ 00094 void cls(); 00095 00096 int rows(); 00097 int columns(); 00098 00099 protected: 00100 00101 // Stream implementation functions 00102 virtual int _putc(int value); 00103 virtual int _getc(); 00104 00105 int address(int column, int row); 00106 void character(int column, int row, int c); 00107 void writeByte(int value); 00108 void writeCommand(int command); 00109 void writeData(int data); 00110 00111 DigitalOut _rs, _e; 00112 BusOut _d; 00113 LCDType _type; 00114 00115 int _column; 00116 int _row; 00117 }; 00118 00119 #endif
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