TextLCD library for controlling various LCD panels based on the HD44780 4-bit interface
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Revision 9:87fdf4a45de7, committed 2015-01-03
- Comitter:
- rs27
- Date:
- Sat Jan 03 15:26:34 2015 +0000
- Parent:
- 8:308d188a2d3a
- Commit message:
- 123;
Changed in this revision
--- a/TextLCD.cpp Thu Jan 02 21:07:01 2014 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,159 +0,0 @@ -/* mbed TextLCD Library, for a 4-bit LCD based on HD44780 - * Copyright (c) 2007-2010, sford, http://mbed.org - * - * 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. - */ - -#include "TextLCD.h" -#include "mbed.h" - -TextLCD::TextLCD(PinName rs, PinName e, PinName d4, PinName d5, - PinName d6, PinName d7, LCDType type) : _rs(rs), - _e(e), _d(d4, d5, d6, d7), - _type(type) { - - _e = 1; - _rs = 0; // command mode - - wait(0.015); // Wait 15ms to ensure powered up - - // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus) - for (int i=0; i<3; i++) { - writeByte(0x3); - wait(0.00164); // this command takes 1.64ms, so wait for it - } - writeByte(0x2); // 4-bit mode - wait(0.000040f); // most instructions take 40us - - writeCommand(0x28); // Function set 001 BW N F - - - writeCommand(0x0C); - writeCommand(0x6); // Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes - cls(); -} - -void TextLCD::character(int column, int row, int c) { - int a = address(column, row); - writeCommand(a); - writeData(c); -} - -void TextLCD::cls() { - writeCommand(0x01); // cls, and set cursor to 0 - wait(0.00164f); // This command takes 1.64 ms - locate(0, 0); -} - -void TextLCD::locate(int column, int row) { - _column = column; - _row = row; -} - -int TextLCD::_putc(int value) { - if (value == '\n') { - _column = 0; - _row++; - if (_row >= rows()) { - _row = 0; - } - } else { - character(_column, _row, value); - _column++; - if (_column >= columns()) { - _column = 0; - _row++; - if (_row >= rows()) { - _row = 0; - } - } - } - return value; -} - -int TextLCD::_getc() { - return -1; -} - -void TextLCD::writeByte(int value) { - _d = value >> 4; - wait(0.000040f); // most instructions take 40us - _e = 0; - wait(0.000040f); - _e = 1; - _d = value >> 0; - wait(0.000040f); - _e = 0; - wait(0.000040f); // most instructions take 40us - _e = 1; -} - -void TextLCD::writeCommand(int command) { - _rs = 0; - writeByte(command); -} - -void TextLCD::writeData(int data) { - _rs = 1; - writeByte(data); -} - -int TextLCD::address(int column, int row) { - switch (_type) { - case LCD20x4: - switch (row) { - case 0: - return 0x80 + column; - case 1: - return 0xc0 + column; - case 2: - return 0x94 + column; - case 3: - return 0xd4 + column; - } - case LCD16x2B: - return 0x80 + (row * 40) + column; - case LCD16x2: - case LCD20x2: - default: - return 0x80 + (row * 0x40) + column; - } -} - -int TextLCD::columns() { - switch (_type) { - case LCD20x4: - case LCD20x2: - return 20; - case LCD16x2: - case LCD16x2B: - default: - return 16; - } -} - -int TextLCD::rows() { - switch (_type) { - case LCD20x4: - return 4; - case LCD16x2: - case LCD16x2B: - case LCD20x2: - default: - return 2; - } -}
--- a/TextLCD.h Thu Jan 02 21:07:01 2014 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,111 +0,0 @@ -/* mbed TextLCD Library, for a 4-bit LCD based on HD44780 - * Copyright (c) 2007-2010, sford, http://mbed.org - * - * 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, d4-d7 - * - * 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 d4-d7 Data lines for using as a 4-bit interface - * @param type Sets the panel size/addressing mode (default = LCD16x2) - */ - TextLCD(PinName rs, PinName e, PinName d4, PinName d5, PinName d6, PinName d7, 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
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/myTextLCD.cpp Sat Jan 03 15:26:34 2015 +0000 @@ -0,0 +1,299 @@ +/* mbed TextLCD Library, for a 4-bit LCD based on HD44780 + * Copyright (c) 2007-2010, sford, http://mbed.org + * + * 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. + */ + +#include "myTextLCD.h" +#include "mbed.h" +#include "MODSERIAL.h" + +extern MODSERIAL pc; // definiert in main + +TextLCD::TextLCD(PinName rs, PinName e, PinName d4, PinName d5, + PinName d6, PinName d7, LCDType type) : _rs(rs), + _e(e), _d(d4, d5, d6, d7), + _type(type) { + + _e = 1; + _rs = 0; // command mode + _type = LCD16x2; + + // die Anzeige soll hier zwischengespeichert werden + for(int i = 0; i < 16; i++) + { + zeile1_text[i] = 0x20; // Leerzeichen + zeile2_text[i] = 0x20; // Leerzeichen + zeile1_flag[i] = false; + zeile2_flag[i] = false; + } + + lcd_flag = true; + + wait(0.015); // Wait 15ms to ensure powered up + + // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus) + for (int i=0; i<3; i++) { + writeByte(0x3); + wait(0.00164); // this command takes 1.64ms, so wait for it + } + writeByte(0x2); // 4-bit mode + wait(0.000040f); // most instructions take 40us + + writeCommand(0x28); // Function set 001 BW N F - - + writeCommand(0x0C); + writeCommand(0x6); // Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes + cls(); +} + +//--------------------------------------------------- +// in der Phase, wo die LCD Anzeige von einer Eingabe +// benötigt wird, kann mit diesem Falg die Ausgabe +// abgeschaltet werden. + +void TextLCD::set_lcd_flag(bool flag) +{ + lcd_flag = flag; +} + +// hier werden die Daten in die LCD Anzeige geschrieben +// im neuen Ablauf werden hier die Daten in die Variable geschrieben + +void TextLCD::character(int column, int row, int c) +{ + + if (row == 0) + { + if (zeile1_text[column] != c) + { + zeile1_text[column] = c; + zeile1_flag[column] = true; + } + } + else + { + if (zeile2_text[column] != c) + { + zeile2_text[column] = c; + zeile2_flag[column] = true; + } + } +} + +// ----------------------------------------------------- +// den Text im Speicher auf die LCD Anzeige ausgeben + +void TextLCD::writeLCD() +{ + int i; + + if (lcd_flag) + { + // Text auf Zeile 1 ausgeben + for (i = 0; i<16; i++) + { + if (zeile1_flag[i]) + { + int a = address(i, 0); + writeCommand(a); + writeData(zeile1_text[i]); + zeile1_flag[i] = false; + } + } + + // Text auf Zeile 2 ausgeben + for (i = 0; i<16; i++) + { + if (zeile2_flag[i]) + { + int a = address(i, 1); + writeCommand(a); + writeData(zeile2_text[i]); + zeile2_flag[i] = false; + } + } + } +} + +// -------------------------------------------------------- +// Nachdem die LCD Anzeige wieder die Freigabe bekommt +// wird der ganze Speicher auf die LCD Anzeige ausgeben +// +void TextLCD::writeALL() +{ + int i, a; + + // Text auf Zeile 1 ausgeben + a = address(0, 0); + writeCommand(a); + wait_us(40); + + for (i = 0; i<16; i++) + { + writeData(zeile1_text[i]); + zeile1_flag[i] = false; + } + + // Text auf Zeile 2 ausgeben + + a = address(0, 1); + writeCommand(a); + wait_us(40); + + for (i = 0; i<16; i++) + { + writeData(zeile2_text[i]); + zeile2_flag[i] = false; + } + + // Text auf Zeile 1 ausgeben + a = address(0, 0); + writeCommand(a); + wait_us(40); +} + +void TextLCD::cls() +{ + writeCommand(0x01); // cls, and set cursor to 0 + wait(0.00164f); // This command takes 1.64 ms + locate(0, 0); + +} + +void TextLCD::locate(int column, int row) +{ + _column = column; + _row = row; +} + +int TextLCD::_putc(int value) +{ + if (value == '\n') { + _column = 0; + _row++; + if (_row >= rows()) { + _row = 0; + } + } else { + character(_column, _row, value); + _column++; + if (_column >= columns()) { + _column = 0; + _row++; + if (_row >= rows()) { + _row = 0; + } + } + } + return value; +} + +int TextLCD::_getc() { + return -1; +} + +void TextLCD::writeByte(int value) +{ + _d = value >> 4; + wait_us(1); + _e = 0; + wait_us(40); + _e = 1; + _d = value >> 0; + wait_us(1); + _e = 0; + wait_us(40); + _e = 1; + wait_us(42); // most instructions take 40us +} + +void TextLCD::writeCommand(int command) +{ + _rs = 0; + writeByte(command); +} + +void TextLCD::writeData(int data) +{ + _rs = 1; + writeByte(data); +} + +int TextLCD::address(int column, int row) +{ + switch (_type) { + case LCD20x4: + switch (row) { + case 0: + return 0x80 + column; + case 1: + return 0xc0 + column; + case 2: + return 0x94 + column; + case 3: + return 0xd4 + column; + } + case LCD16x2B: + return 0x80 + (row * 40) + column; + case LCD16x2: + case LCD20x2: + default: + return 0x80 + (row * 0x40) + column; + } +} + +int TextLCD::columns() +{ + switch (_type) { + case LCD20x4: + case LCD20x2: + return 20; + case LCD16x2: + case LCD16x2B: + default: + return 16; + } +} + +int TextLCD::rows() +{ + switch (_type) { + case LCD20x4: + return 4; + case LCD16x2: + case LCD16x2B: + case LCD20x2: + default: + return 2; + } +} + +void TextLCD::print_LCD(char* Pbuffer,char line_num, char offset) +{ + unsigned int i=0; + + int a = address(offset,line_num); + writeCommand(a); + + while (Pbuffer[i] != 0) + { + writeData(Pbuffer[i]); + i++; + } +} \ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/myTextLCD.h Sat Jan 03 15:26:34 2015 +0000 @@ -0,0 +1,124 @@ +/* mbed TextLCD Library, for a 4-bit LCD based on HD44780 + * Copyright (c) 2007-2010, sford, http://mbed.org + * + * 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, d4-d7 + * + * 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 d4-d7 Data lines for using as a 4-bit interface + * @param type Sets the panel size/addressing mode (default = LCD16x2) + */ + TextLCD(PinName rs, PinName e, PinName d4, PinName d5, PinName d6, PinName d7, 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 writeLCD(void); + void writeALL(void); + + void locate(int column, int row); + + /** Clear the screen and locate to 0,0 */ + void cls(); + + int rows(); + int columns(); + + void print_LCD(char* Pbuffer,char line_num, char offset); + + char zeile1_text[20]; + char zeile2_text[20]; + bool zeile1_flag[20]; + bool zeile2_flag[20]; + + void writeCommand(int command); + int address(int column, int row); + void set_lcd_flag(bool flag); + +protected: + + // Stream implementation functions + virtual int _putc(int value); + virtual int _getc(); + void character(int column, int row, int c); + void writeByte(int value); + void writeData(int data); + + DigitalOut _rs, _e; + BusOut _d; + LCDType _type; + + int _column; + int _row; + bool lcd_flag; +}; + +#endif