A simple program to try the TESTBED evaluation KIT http://www.lextronic.fr/P22450-platine-devaluation-testbed.html
Fork of TestBed-LCD20x4 by
TextLCD.cpp
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 #include "TextLCD.h" 00024 #include "mbed.h" 00025 00026 TextLCD::TextLCD(PinName rs, PinName rw, PinName e, PinName d4, PinName d5, 00027 PinName d6, PinName d7, LCDType type) : _rs(rs), _rw(rw), 00028 _e(e), _d(d4, d5, d6, d7), 00029 _type(type) { 00030 00031 _rw = 0; 00032 _e = 1; 00033 _rs = 0; // command mode 00034 00035 wait(0.015); // Wait 15ms to ensure powered up 00036 00037 // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus) 00038 for (int i=0; i<3; i++) { 00039 writeNibble(0x3); 00040 wait(0.00164); // this command takes 1.64ms, so wait for it 00041 } 00042 00043 writeNibble(0x2); // 4-bit mode 00044 00045 writeCommand(0x28); // Function set 001 BW N F - - 00046 writeCommand(0x0C); 00047 writeCommand(0x6); // Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes 00048 cls(); 00049 } 00050 00051 void TextLCD::character(int column, int row, int c) { 00052 int a = address(column, row); 00053 writeCommand(a); 00054 writeData(c); 00055 } 00056 00057 void TextLCD::cls() { 00058 writeCommand(0x01); // cls, and set cursor to 0 00059 wait(0.00164f); // This command takes 1.64 ms 00060 locate(0, 0); 00061 } 00062 00063 void TextLCD::locate(int column, int row) { 00064 _column = column; 00065 _row = row; 00066 } 00067 00068 int TextLCD::_putc(int value) { 00069 if (value == '\n') { 00070 _column = 0; 00071 _row++; 00072 if (_row >= rows()) { 00073 _row = 0; 00074 } 00075 } else { 00076 character(_column, _row, value); 00077 _column++; 00078 if (_column >= columns()) { 00079 _column = 0; 00080 _row++; 00081 if (_row >= rows()) { 00082 _row = 0; 00083 } 00084 } 00085 } 00086 return value; 00087 } 00088 00089 int TextLCD::_getc() { 00090 return -1; 00091 } 00092 00093 void TextLCD::writeByte(int value) { 00094 writeNibble(value >> 4); 00095 writeNibble(value >> 0); 00096 } 00097 00098 void TextLCD::writeCommand(int command) { 00099 _rs = 0; 00100 writeByte(command); 00101 } 00102 00103 void TextLCD::clock(void) { 00104 wait(0.000040f); 00105 _e = 0; 00106 wait(0.000040f); 00107 _e = 1; 00108 } 00109 00110 void TextLCD::writeNibble(int data) { 00111 _d = data; 00112 clock(); 00113 } 00114 00115 void TextLCD::writeData(int data) { 00116 _rs = 1; 00117 writeByte(data); 00118 } 00119 00120 int TextLCD::address(int column, int row) { 00121 switch (_type) { 00122 case LCD20x4: 00123 switch (row) { 00124 case 0: 00125 return 0x80 + column; 00126 case 1: 00127 return 0xc0 + column; 00128 case 2: 00129 return 0x94 + column; 00130 case 3: 00131 return 0xd4 + column; 00132 } 00133 case LCD16x2B: 00134 return 0x80 + (row * 40) + column; 00135 case LCD16x2: 00136 case LCD20x2: 00137 default: 00138 return 0x80 + (row * 0x40) + column; 00139 } 00140 } 00141 00142 int TextLCD::columns() { 00143 switch (_type) { 00144 case LCD20x4: 00145 case LCD20x2: 00146 return 20; 00147 case LCD16x2: 00148 case LCD16x2B: 00149 default: 00150 return 16; 00151 } 00152 } 00153 00154 int TextLCD::rows() { 00155 switch (_type) { 00156 case LCD20x4: 00157 return 4; 00158 case LCD16x2: 00159 case LCD16x2B: 00160 case LCD20x2: 00161 default: 00162 return 2; 00163 } 00164 }
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