Javier Negrette / TextLCDa

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Fork of TextLCD by Pallavi Prasad

TextLCD.cpp@1:bb9be1ccca1e, 2013-11-08 (annotated)

Committer:
javiernegrette
Date:
Fri Nov 08 17:01:15 2013 +0000
Revision:
1:bb9be1ccca1e
Parent:
0:de90b67b2bca 
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Who changed what in which revision?

UserRevisionLine numberNew contents of line
pprasad7 0:de90b67b2bca 1 /* mbed TextLCD Library, for a 4-bit LCD based on HD44780
pprasad7 0:de90b67b2bca 2 * Copyright (c) 2007-2010, sford
pprasad7 0:de90b67b2bca 3 *
pprasad7 0:de90b67b2bca 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
pprasad7 0:de90b67b2bca 5 * of this software and associated documentation files (the "Software"), to deal
pprasad7 0:de90b67b2bca 6 * in the Software without restriction, including without limitation the rights
pprasad7 0:de90b67b2bca 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
pprasad7 0:de90b67b2bca 8 * copies of the Software, and to permit persons to whom the Software is
pprasad7 0:de90b67b2bca 9 * furnished to do so, subject to the following conditions:
pprasad7 0:de90b67b2bca 10 *
pprasad7 0:de90b67b2bca 11 * The above copyright notice and this permission notice shall be included in
pprasad7 0:de90b67b2bca 12 * all copies or substantial portions of the Software.
pprasad7 0:de90b67b2bca 13 *
pprasad7 0:de90b67b2bca 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
pprasad7 0:de90b67b2bca 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
pprasad7 0:de90b67b2bca 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
pprasad7 0:de90b67b2bca 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
pprasad7 0:de90b67b2bca 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
pprasad7 0:de90b67b2bca 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
pprasad7 0:de90b67b2bca 20 * THE SOFTWARE.
pprasad7 0:de90b67b2bca 21 */
pprasad7 0:de90b67b2bca 22
pprasad7 0:de90b67b2bca 23 #include "TextLCD.h"
pprasad7 0:de90b67b2bca 24 #include "mbed.h"
pprasad7 0:de90b67b2bca 25
pprasad7 0:de90b67b2bca 26 TextLCD::TextLCD(PinName rs, PinName e, PinName d0, PinName d1,
pprasad7 0:de90b67b2bca 27 PinName d2, PinName d3, LCDType type) : _rs(rs),
pprasad7 0:de90b67b2bca 28 _e(e), _d(d0, d1, d2, d3),
pprasad7 0:de90b67b2bca 29 _type(type) {
pprasad7 0:de90b67b2bca 30
pprasad7 0:de90b67b2bca 31 _e = 1;
pprasad7 0:de90b67b2bca 32 _rs = 0; // command mode
pprasad7 0:de90b67b2bca 33
pprasad7 0:de90b67b2bca 34 wait(0.015); // Wait 15ms to ensure powered up
pprasad7 0:de90b67b2bca 35
pprasad7 0:de90b67b2bca 36 // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus)
pprasad7 0:de90b67b2bca 37 for (int i=0; i<3; i++) {
pprasad7 0:de90b67b2bca 38 writeByte(0x3);
pprasad7 0:de90b67b2bca 39 wait(0.00164); // this command takes 1.64ms, so wait for it
pprasad7 0:de90b67b2bca 40 }
pprasad7 0:de90b67b2bca 41 writeByte(0x2); // 4-bit mode
pprasad7 0:de90b67b2bca 42 wait(0.000040f); // most instructions take 40us
pprasad7 0:de90b67b2bca 43
pprasad7 0:de90b67b2bca 44 writeCommand(0x28); // Function set 001 BW N F - -
pprasad7 0:de90b67b2bca 45 writeCommand(0x0C);
pprasad7 0:de90b67b2bca 46 writeCommand(0x6); // Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes
pprasad7 0:de90b67b2bca 47 cls();
pprasad7 0:de90b67b2bca 48 }
pprasad7 0:de90b67b2bca 49
pprasad7 0:de90b67b2bca 50 void TextLCD::character(int column, int row, int c) {
pprasad7 0:de90b67b2bca 51 int a = address(column, row);
pprasad7 0:de90b67b2bca 52 writeCommand(a);
pprasad7 0:de90b67b2bca 53 writeData(c);
pprasad7 0:de90b67b2bca 54 }
pprasad7 0:de90b67b2bca 55
pprasad7 0:de90b67b2bca 56 void TextLCD::cls() {
pprasad7 0:de90b67b2bca 57 writeCommand(0x01); // cls, and set cursor to 0
pprasad7 0:de90b67b2bca 58 wait(0.00164f); // This command takes 1.64 ms
pprasad7 0:de90b67b2bca 59 locate(0, 0);
pprasad7 0:de90b67b2bca 60 }
pprasad7 0:de90b67b2bca 61
pprasad7 0:de90b67b2bca 62 void TextLCD::locate(int column, int row) {
pprasad7 0:de90b67b2bca 63 _column = column;
pprasad7 0:de90b67b2bca 64 _row = row;
pprasad7 0:de90b67b2bca 65 }
pprasad7 0:de90b67b2bca 66
pprasad7 0:de90b67b2bca 67 int TextLCD::_putc(int value) {
pprasad7 0:de90b67b2bca 68 if (value == '\n') {
pprasad7 0:de90b67b2bca 69 _column = 0;
pprasad7 0:de90b67b2bca 70 _row++;
pprasad7 0:de90b67b2bca 71 if (_row >= rows()) {
pprasad7 0:de90b67b2bca 72 _row = 0;
pprasad7 0:de90b67b2bca 73 }
pprasad7 0:de90b67b2bca 74 } else {
pprasad7 0:de90b67b2bca 75 character(_column, _row, value);
pprasad7 0:de90b67b2bca 76 _column++;
pprasad7 0:de90b67b2bca 77 if (_column >= columns()) {
pprasad7 0:de90b67b2bca 78 _column = 0;
pprasad7 0:de90b67b2bca 79 _row++;
pprasad7 0:de90b67b2bca 80 if (_row >= rows()) {
pprasad7 0:de90b67b2bca 81 _row = 0;
pprasad7 0:de90b67b2bca 82 }
pprasad7 0:de90b67b2bca 83 }
pprasad7 0:de90b67b2bca 84 }
pprasad7 0:de90b67b2bca 85 return value;
pprasad7 0:de90b67b2bca 86 }
pprasad7 0:de90b67b2bca 87
pprasad7 0:de90b67b2bca 88 int TextLCD::_getc() {
pprasad7 0:de90b67b2bca 89 return -1;
pprasad7 0:de90b67b2bca 90 }
pprasad7 0:de90b67b2bca 91
pprasad7 0:de90b67b2bca 92 void TextLCD::writeByte(int value) {
pprasad7 0:de90b67b2bca 93 _d = value >> 4;
pprasad7 0:de90b67b2bca 94 wait(0.000040f); // most instructions take 40us
pprasad7 0:de90b67b2bca 95 _e = 0;
pprasad7 0:de90b67b2bca 96 wait(0.000040f);
pprasad7 0:de90b67b2bca 97 _e = 1;
pprasad7 0:de90b67b2bca 98 _d = value >> 0;
pprasad7 0:de90b67b2bca 99 wait(0.000040f);
pprasad7 0:de90b67b2bca 100 _e = 0;
pprasad7 0:de90b67b2bca 101 wait(0.000040f); // most instructions take 40us
pprasad7 0:de90b67b2bca 102 _e = 1;
pprasad7 0:de90b67b2bca 103 }
pprasad7 0:de90b67b2bca 104
pprasad7 0:de90b67b2bca 105 void TextLCD::writeCommand(int command) {
pprasad7 0:de90b67b2bca 106 _rs = 0;
pprasad7 0:de90b67b2bca 107 writeByte(command);
pprasad7 0:de90b67b2bca 108 }
pprasad7 0:de90b67b2bca 109
pprasad7 0:de90b67b2bca 110 void TextLCD::writeData(int data) {
pprasad7 0:de90b67b2bca 111 _rs = 1;
pprasad7 0:de90b67b2bca 112 writeByte(data);
pprasad7 0:de90b67b2bca 113 }
pprasad7 0:de90b67b2bca 114
pprasad7 0:de90b67b2bca 115 int TextLCD::address(int column, int row) {
pprasad7 0:de90b67b2bca 116 switch (_type) {
pprasad7 0:de90b67b2bca 117 case LCD20x4:
pprasad7 0:de90b67b2bca 118 switch (row) {
pprasad7 0:de90b67b2bca 119 case 0:
pprasad7 0:de90b67b2bca 120 return 0x80 + column;
pprasad7 0:de90b67b2bca 121 case 1:
pprasad7 0:de90b67b2bca 122 return 0xc0 + column;
pprasad7 0:de90b67b2bca 123 case 2:
pprasad7 0:de90b67b2bca 124 return 0x94 + column;
pprasad7 0:de90b67b2bca 125 case 3:
pprasad7 0:de90b67b2bca 126 return 0xd4 + column;
pprasad7 0:de90b67b2bca 127 }
pprasad7 0:de90b67b2bca 128 case LCD16x2B:
pprasad7 0:de90b67b2bca 129 return 0x80 + (row * 40) + column;
pprasad7 0:de90b67b2bca 130 case LCD16x2:
pprasad7 0:de90b67b2bca 131 case LCD20x2:
pprasad7 0:de90b67b2bca 132 default:
pprasad7 0:de90b67b2bca 133 return 0x80 + (row * 0x40) + column;
pprasad7 0:de90b67b2bca 134 }
pprasad7 0:de90b67b2bca 135 }
pprasad7 0:de90b67b2bca 136
pprasad7 0:de90b67b2bca 137 int TextLCD::columns() {
pprasad7 0:de90b67b2bca 138 switch (_type) {
pprasad7 0:de90b67b2bca 139 case LCD20x4:
pprasad7 0:de90b67b2bca 140 case LCD20x2:
pprasad7 0:de90b67b2bca 141 return 20;
pprasad7 0:de90b67b2bca 142 case LCD16x2:
pprasad7 0:de90b67b2bca 143 case LCD16x2B:
pprasad7 0:de90b67b2bca 144 default:
pprasad7 0:de90b67b2bca 145 return 16;
pprasad7 0:de90b67b2bca 146 }
pprasad7 0:de90b67b2bca 147 }
pprasad7 0:de90b67b2bca 148
pprasad7 0:de90b67b2bca 149 int TextLCD::rows() {
pprasad7 0:de90b67b2bca 150 switch (_type) {
pprasad7 0:de90b67b2bca 151 case LCD20x4:
pprasad7 0:de90b67b2bca 152 return 4;
pprasad7 0:de90b67b2bca 153 case LCD16x2:
pprasad7 0:de90b67b2bca 154 case LCD16x2B:
pprasad7 0:de90b67b2bca 155 case LCD20x2:
pprasad7 0:de90b67b2bca 156 default:
pprasad7 0:de90b67b2bca 157 return 2;
pprasad7 0:de90b67b2bca 158 }
pprasad7 0:de90b67b2bca 159 }