MPro _ 3 Mann / Mbed 2 deprecated mbed_LCD

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Dependencies:   mbed

TextLCD.cpp@0:d494e07c7c0e, 2014-06-26 (annotated)

Committer:
Sneid
Date:
Thu Jun 26 08:20:29 2014 +0000
Revision:
0:d494e07c7c0e
mbed_LCD

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Sneid 0:d494e07c7c0e 1 /* mbed TextLCD Library, for a 4-bit LCD based on HD44780
Sneid 0:d494e07c7c0e 2 * Copyright (c) 2007-2010, sford, http://mbed.org
Sneid 0:d494e07c7c0e 3 *
Sneid 0:d494e07c7c0e 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
Sneid 0:d494e07c7c0e 5 * of this software and associated documentation files (the "Software"), to deal
Sneid 0:d494e07c7c0e 6 * in the Software without restriction, including without limitation the rights
Sneid 0:d494e07c7c0e 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
Sneid 0:d494e07c7c0e 8 * copies of the Software, and to permit persons to whom the Software is
Sneid 0:d494e07c7c0e 9 * furnished to do so, subject to the following conditions:
Sneid 0:d494e07c7c0e 10 *
Sneid 0:d494e07c7c0e 11 * The above copyright notice and this permission notice shall be included in
Sneid 0:d494e07c7c0e 12 * all copies or substantial portions of the Software.
Sneid 0:d494e07c7c0e 13 *
Sneid 0:d494e07c7c0e 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
Sneid 0:d494e07c7c0e 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
Sneid 0:d494e07c7c0e 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
Sneid 0:d494e07c7c0e 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
Sneid 0:d494e07c7c0e 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
Sneid 0:d494e07c7c0e 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
Sneid 0:d494e07c7c0e 20 * THE SOFTWARE.
Sneid 0:d494e07c7c0e 21 */
Sneid 0:d494e07c7c0e 22
Sneid 0:d494e07c7c0e 23 #include "TextLCD.h"
Sneid 0:d494e07c7c0e 24 #include "mbed.h"
Sneid 0:d494e07c7c0e 25
Sneid 0:d494e07c7c0e 26 TextLCD::TextLCD(PinName rs, PinName rw, PinName e, PinName d4, PinName d5,
Sneid 0:d494e07c7c0e 27 PinName d6, PinName d7, LCDType type) : _rs(rs), _rw(rw),
Sneid 0:d494e07c7c0e 28 _e(e), _d(d4, d5, d6, d7),
Sneid 0:d494e07c7c0e 29 _type(type) {
Sneid 0:d494e07c7c0e 30
Sneid 0:d494e07c7c0e 31 _rw = 0;
Sneid 0:d494e07c7c0e 32 _e = 1;
Sneid 0:d494e07c7c0e 33 _rs = 0; // command mode
Sneid 0:d494e07c7c0e 34
Sneid 0:d494e07c7c0e 35 wait(0.015); // Wait 15ms to ensure powered up
Sneid 0:d494e07c7c0e 36
Sneid 0:d494e07c7c0e 37 // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus)
Sneid 0:d494e07c7c0e 38 for (int i=0; i<3; i++) {
Sneid 0:d494e07c7c0e 39 writeNibble(0x3);
Sneid 0:d494e07c7c0e 40 wait(0.00164); // this command takes 1.64ms, so wait for it
Sneid 0:d494e07c7c0e 41 }
Sneid 0:d494e07c7c0e 42
Sneid 0:d494e07c7c0e 43 writeNibble(0x2); // 4-bit mode
Sneid 0:d494e07c7c0e 44
Sneid 0:d494e07c7c0e 45 writeCommand(0x28); // Function set 001 BW N F - -
Sneid 0:d494e07c7c0e 46 writeCommand(0x0C);
Sneid 0:d494e07c7c0e 47 writeCommand(0x6); // Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes
Sneid 0:d494e07c7c0e 48 cls();
Sneid 0:d494e07c7c0e 49 }
Sneid 0:d494e07c7c0e 50
Sneid 0:d494e07c7c0e 51 void TextLCD::character(int column, int row, int c) {
Sneid 0:d494e07c7c0e 52 int a = address(column, row);
Sneid 0:d494e07c7c0e 53 writeCommand(a);
Sneid 0:d494e07c7c0e 54 writeData(c);
Sneid 0:d494e07c7c0e 55 }
Sneid 0:d494e07c7c0e 56
Sneid 0:d494e07c7c0e 57 void TextLCD::cls() {
Sneid 0:d494e07c7c0e 58 writeCommand(0x01); // cls, and set cursor to 0
Sneid 0:d494e07c7c0e 59 wait(0.00164f); // This command takes 1.64 ms
Sneid 0:d494e07c7c0e 60 locate(0, 0);
Sneid 0:d494e07c7c0e 61 }
Sneid 0:d494e07c7c0e 62
Sneid 0:d494e07c7c0e 63 void TextLCD::locate(int column, int row) {
Sneid 0:d494e07c7c0e 64 _column = column;
Sneid 0:d494e07c7c0e 65 _row = row;
Sneid 0:d494e07c7c0e 66 }
Sneid 0:d494e07c7c0e 67
Sneid 0:d494e07c7c0e 68 int TextLCD::_putc(int value) {
Sneid 0:d494e07c7c0e 69 if (value == '\n') {
Sneid 0:d494e07c7c0e 70 _column = 0;
Sneid 0:d494e07c7c0e 71 _row++;
Sneid 0:d494e07c7c0e 72 if (_row >= rows()) {
Sneid 0:d494e07c7c0e 73 _row = 0;
Sneid 0:d494e07c7c0e 74 }
Sneid 0:d494e07c7c0e 75 } else {
Sneid 0:d494e07c7c0e 76 character(_column, _row, value);
Sneid 0:d494e07c7c0e 77 _column++;
Sneid 0:d494e07c7c0e 78 if (_column >= columns()) {
Sneid 0:d494e07c7c0e 79 _column = 0;
Sneid 0:d494e07c7c0e 80 _row++;
Sneid 0:d494e07c7c0e 81 if (_row >= rows()) {
Sneid 0:d494e07c7c0e 82 _row = 0;
Sneid 0:d494e07c7c0e 83 }
Sneid 0:d494e07c7c0e 84 }
Sneid 0:d494e07c7c0e 85 }
Sneid 0:d494e07c7c0e 86 return value;
Sneid 0:d494e07c7c0e 87 }
Sneid 0:d494e07c7c0e 88
Sneid 0:d494e07c7c0e 89 int TextLCD::_getc() {
Sneid 0:d494e07c7c0e 90 return -1;
Sneid 0:d494e07c7c0e 91 }
Sneid 0:d494e07c7c0e 92
Sneid 0:d494e07c7c0e 93 void TextLCD::writeByte(int value) {
Sneid 0:d494e07c7c0e 94 writeNibble(value >> 4);
Sneid 0:d494e07c7c0e 95 writeNibble(value >> 0);
Sneid 0:d494e07c7c0e 96 }
Sneid 0:d494e07c7c0e 97
Sneid 0:d494e07c7c0e 98 void TextLCD::writeCommand(int command) {
Sneid 0:d494e07c7c0e 99 _rs = 0;
Sneid 0:d494e07c7c0e 100 writeByte(command);
Sneid 0:d494e07c7c0e 101 }
Sneid 0:d494e07c7c0e 102
Sneid 0:d494e07c7c0e 103 void TextLCD::clock(void) {
Sneid 0:d494e07c7c0e 104 wait(0.000040f);
Sneid 0:d494e07c7c0e 105 _e = 0;
Sneid 0:d494e07c7c0e 106 wait(0.000040f);
Sneid 0:d494e07c7c0e 107 _e = 1;
Sneid 0:d494e07c7c0e 108 }
Sneid 0:d494e07c7c0e 109
Sneid 0:d494e07c7c0e 110 void TextLCD::writeNibble(int data) {
Sneid 0:d494e07c7c0e 111 _d = data;
Sneid 0:d494e07c7c0e 112 clock();
Sneid 0:d494e07c7c0e 113 }
Sneid 0:d494e07c7c0e 114
Sneid 0:d494e07c7c0e 115 void TextLCD::writeData(int data) {
Sneid 0:d494e07c7c0e 116 _rs = 1;
Sneid 0:d494e07c7c0e 117 writeByte(data);
Sneid 0:d494e07c7c0e 118 }
Sneid 0:d494e07c7c0e 119
Sneid 0:d494e07c7c0e 120 int TextLCD::address(int column, int row) {
Sneid 0:d494e07c7c0e 121 switch (_type) {
Sneid 0:d494e07c7c0e 122 case LCD20x4:
Sneid 0:d494e07c7c0e 123 switch (row) {
Sneid 0:d494e07c7c0e 124 case 0:
Sneid 0:d494e07c7c0e 125 return 0x80 + column;
Sneid 0:d494e07c7c0e 126 case 1:
Sneid 0:d494e07c7c0e 127 return 0xc0 + column;
Sneid 0:d494e07c7c0e 128 case 2:
Sneid 0:d494e07c7c0e 129 return 0x94 + column;
Sneid 0:d494e07c7c0e 130 case 3:
Sneid 0:d494e07c7c0e 131 return 0xd4 + column;
Sneid 0:d494e07c7c0e 132 }
Sneid 0:d494e07c7c0e 133 case LCD16x2B:
Sneid 0:d494e07c7c0e 134 return 0x80 + (row * 40) + column;
Sneid 0:d494e07c7c0e 135 case LCD16x2:
Sneid 0:d494e07c7c0e 136 case LCD20x2:
Sneid 0:d494e07c7c0e 137 default:
Sneid 0:d494e07c7c0e 138 return 0x80 + (row * 0x40) + column;
Sneid 0:d494e07c7c0e 139 }
Sneid 0:d494e07c7c0e 140 }
Sneid 0:d494e07c7c0e 141
Sneid 0:d494e07c7c0e 142 int TextLCD::columns() {
Sneid 0:d494e07c7c0e 143 switch (_type) {
Sneid 0:d494e07c7c0e 144 case LCD20x4:
Sneid 0:d494e07c7c0e 145 case LCD20x2:
Sneid 0:d494e07c7c0e 146 return 20;
Sneid 0:d494e07c7c0e 147 case LCD16x2:
Sneid 0:d494e07c7c0e 148 case LCD16x2B:
Sneid 0:d494e07c7c0e 149 default:
Sneid 0:d494e07c7c0e 150 return 16;
Sneid 0:d494e07c7c0e 151 }
Sneid 0:d494e07c7c0e 152 }
Sneid 0:d494e07c7c0e 153
Sneid 0:d494e07c7c0e 154 int TextLCD::rows() {
Sneid 0:d494e07c7c0e 155 switch (_type) {
Sneid 0:d494e07c7c0e 156 case LCD20x4:
Sneid 0:d494e07c7c0e 157 return 4;
Sneid 0:d494e07c7c0e 158 case LCD16x2:
Sneid 0:d494e07c7c0e 159 case LCD16x2B:
Sneid 0:d494e07c7c0e 160 case LCD20x2:
Sneid 0:d494e07c7c0e 161 default:
Sneid 0:d494e07c7c0e 162 return 2;
Sneid 0:d494e07c7c0e 163 }
Sneid 0:d494e07c7c0e 164 }