16*2Lcd Display
TextLCD.h
- Committer:
- simon
- Date:
- 2010-05-29
- Revision:
- 5:a53b3e2d6f1e
- Parent:
- 3:2a46d5820a78
- Child:
- 6:e4cb7ddee0d3
File content as of revision 5:a53b3e2d6f1e:
/* mbed TextLCD Library, for a 4-bit LCD based on HD44780 * Copyright (c) 2007-2010, sford * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #ifndef MBED_TEXTLCD_H #define MBED_TEXTLCD_H #include "mbed.h" /** A TextLCD interface for driving 4-bit HD44780-based LCDs * * Currently supports 16x2, 20x2 and 20x4 panels * * @code * #include "mbed.h" * #include "TextLCD.h" * * TextLCD lcd(p10, p12, p15, p16, p29, p30); // rs, e, d0-d3 * * int main() { * lcd.printf("Hello World!\n"); * } * @endcode */ class TextLCD : public Stream { public: /** LCD panel format */ enum LCDType { LCD16x2 /**< 16x2 LCD panel (default) */ , LCD16x2B /**< 16x2 LCD panel alternate addressing */ , LCD20x2 /**< 20x2 LCD panel */ , LCD20x4 /**< 20x4 LCD panel */ }; /** Create a TextLCD interface * * @param rs Instruction/data control line * @param e Enable line (clock) * @param d0-d3 Data lines * @param type Sets the panel size/addressing mode (default = LCD16x2) */ TextLCD(PinName rs, PinName e, PinName d0, PinName d1, PinName d2, PinName d3, LCDType type = LCD16x2); #if DOXYGEN_ONLY /** Write a character to the LCD * * @param c The character to write to the display */ int putc(int c); /** Write a formated string to the LCD * * @param format A printf-style format string, followed by the * variables to use in formating the string. */ int printf(const char* format, ...); #endif /** Locate to a screen column and row * * @param column The horizontal position from the left, indexed from 0 * @param row The vertical position from the top, indexed from 0 */ void locate(int column, int row); /** Clear the screen and locate to 0,0 */ void cls(); int rows(); int columns(); protected: // Stream implementation functions virtual int _putc(int value); virtual int _getc(); int address(int column, int row); void character(int column, int row, int c); void writeByte(int value); void writeCommand(int command); void writeData(int data); DigitalOut _rs, _e; BusOut _d; LCDType _type; int _column; int _row; }; #endif