Elmicro Computer / Mbed 2 deprecated TestBed-LCD20x4

Example of using a GDM2004D LCD with Elmicro\'s TestBed for mbed carrier board. Uses an altered version of the TextLCD-library.

Dependencies:   mbed

TextLCD/TextLCD.cpp@0:7c694e032688, 2011-10-11 (annotated)

Committer:
elmicro
Date:
Tue Oct 11 08:13:19 2011 +0000
Revision:
0:7c694e032688
Initial Revision

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elmicro 0:7c694e032688 1 /* mbed TextLCD Library, for a 4-bit LCD based on HD44780
elmicro 0:7c694e032688 2 * Copyright (c) 2007-2010, sford, http://mbed.org
elmicro 0:7c694e032688 3 *
elmicro 0:7c694e032688 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
elmicro 0:7c694e032688 5 * of this software and associated documentation files (the "Software"), to deal
elmicro 0:7c694e032688 6 * in the Software without restriction, including without limitation the rights
elmicro 0:7c694e032688 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
elmicro 0:7c694e032688 8 * copies of the Software, and to permit persons to whom the Software is
elmicro 0:7c694e032688 9 * furnished to do so, subject to the following conditions:
elmicro 0:7c694e032688 10 *
elmicro 0:7c694e032688 11 * The above copyright notice and this permission notice shall be included in
elmicro 0:7c694e032688 12 * all copies or substantial portions of the Software.
elmicro 0:7c694e032688 13 *
elmicro 0:7c694e032688 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
elmicro 0:7c694e032688 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
elmicro 0:7c694e032688 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
elmicro 0:7c694e032688 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
elmicro 0:7c694e032688 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
elmicro 0:7c694e032688 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
elmicro 0:7c694e032688 20 * THE SOFTWARE.
elmicro 0:7c694e032688 21 */
elmicro 0:7c694e032688 22
elmicro 0:7c694e032688 23 #include "TextLCD.h"
elmicro 0:7c694e032688 24 #include "mbed.h"
elmicro 0:7c694e032688 25
elmicro 0:7c694e032688 26 TextLCD::TextLCD(PinName rs, PinName rw, PinName e, PinName d4, PinName d5,
elmicro 0:7c694e032688 27 PinName d6, PinName d7, LCDType type) : _rs(rs), _rw(rw),
elmicro 0:7c694e032688 28 _e(e), _d(d4, d5, d6, d7),
elmicro 0:7c694e032688 29 _type(type) {
elmicro 0:7c694e032688 30
elmicro 0:7c694e032688 31 _rw = 0;
elmicro 0:7c694e032688 32 _e = 1;
elmicro 0:7c694e032688 33 _rs = 0; // command mode
elmicro 0:7c694e032688 34
elmicro 0:7c694e032688 35 wait(0.015); // Wait 15ms to ensure powered up
elmicro 0:7c694e032688 36
elmicro 0:7c694e032688 37 // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus)
elmicro 0:7c694e032688 38 for (int i=0; i<3; i++) {
elmicro 0:7c694e032688 39 writeNibble(0x3);
elmicro 0:7c694e032688 40 wait(0.00164); // this command takes 1.64ms, so wait for it
elmicro 0:7c694e032688 41 }
elmicro 0:7c694e032688 42
elmicro 0:7c694e032688 43 writeNibble(0x2); // 4-bit mode
elmicro 0:7c694e032688 44
elmicro 0:7c694e032688 45 writeCommand(0x28); // Function set 001 BW N F - -
elmicro 0:7c694e032688 46 writeCommand(0x0C);
elmicro 0:7c694e032688 47 writeCommand(0x6); // Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes
elmicro 0:7c694e032688 48 cls();
elmicro 0:7c694e032688 49 }
elmicro 0:7c694e032688 50
elmicro 0:7c694e032688 51 void TextLCD::character(int column, int row, int c) {
elmicro 0:7c694e032688 52 int a = address(column, row);
elmicro 0:7c694e032688 53 writeCommand(a);
elmicro 0:7c694e032688 54 writeData(c);
elmicro 0:7c694e032688 55 }
elmicro 0:7c694e032688 56
elmicro 0:7c694e032688 57 void TextLCD::cls() {
elmicro 0:7c694e032688 58 writeCommand(0x01); // cls, and set cursor to 0
elmicro 0:7c694e032688 59 wait(0.00164f); // This command takes 1.64 ms
elmicro 0:7c694e032688 60 locate(0, 0);
elmicro 0:7c694e032688 61 }
elmicro 0:7c694e032688 62
elmicro 0:7c694e032688 63 void TextLCD::locate(int column, int row) {
elmicro 0:7c694e032688 64 _column = column;
elmicro 0:7c694e032688 65 _row = row;
elmicro 0:7c694e032688 66 }
elmicro 0:7c694e032688 67
elmicro 0:7c694e032688 68 int TextLCD::_putc(int value) {
elmicro 0:7c694e032688 69 if (value == '\n') {
elmicro 0:7c694e032688 70 _column = 0;
elmicro 0:7c694e032688 71 _row++;
elmicro 0:7c694e032688 72 if (_row >= rows()) {
elmicro 0:7c694e032688 73 _row = 0;
elmicro 0:7c694e032688 74 }
elmicro 0:7c694e032688 75 } else {
elmicro 0:7c694e032688 76 character(_column, _row, value);
elmicro 0:7c694e032688 77 _column++;
elmicro 0:7c694e032688 78 if (_column >= columns()) {
elmicro 0:7c694e032688 79 _column = 0;
elmicro 0:7c694e032688 80 _row++;
elmicro 0:7c694e032688 81 if (_row >= rows()) {
elmicro 0:7c694e032688 82 _row = 0;
elmicro 0:7c694e032688 83 }
elmicro 0:7c694e032688 84 }
elmicro 0:7c694e032688 85 }
elmicro 0:7c694e032688 86 return value;
elmicro 0:7c694e032688 87 }
elmicro 0:7c694e032688 88
elmicro 0:7c694e032688 89 int TextLCD::_getc() {
elmicro 0:7c694e032688 90 return -1;
elmicro 0:7c694e032688 91 }
elmicro 0:7c694e032688 92
elmicro 0:7c694e032688 93 void TextLCD::writeByte(int value) {
elmicro 0:7c694e032688 94 writeNibble(value >> 4);
elmicro 0:7c694e032688 95 writeNibble(value >> 0);
elmicro 0:7c694e032688 96 }
elmicro 0:7c694e032688 97
elmicro 0:7c694e032688 98 void TextLCD::writeCommand(int command) {
elmicro 0:7c694e032688 99 _rs = 0;
elmicro 0:7c694e032688 100 writeByte(command);
elmicro 0:7c694e032688 101 }
elmicro 0:7c694e032688 102
elmicro 0:7c694e032688 103 void TextLCD::clock(void) {
elmicro 0:7c694e032688 104 wait(0.000040f);
elmicro 0:7c694e032688 105 _e = 0;
elmicro 0:7c694e032688 106 wait(0.000040f);
elmicro 0:7c694e032688 107 _e = 1;
elmicro 0:7c694e032688 108 }
elmicro 0:7c694e032688 109
elmicro 0:7c694e032688 110 void TextLCD::writeNibble(int data) {
elmicro 0:7c694e032688 111 _d = data;
elmicro 0:7c694e032688 112 clock();
elmicro 0:7c694e032688 113 }
elmicro 0:7c694e032688 114
elmicro 0:7c694e032688 115 void TextLCD::writeData(int data) {
elmicro 0:7c694e032688 116 _rs = 1;
elmicro 0:7c694e032688 117 writeByte(data);
elmicro 0:7c694e032688 118 }
elmicro 0:7c694e032688 119
elmicro 0:7c694e032688 120 int TextLCD::address(int column, int row) {
elmicro 0:7c694e032688 121 switch (_type) {
elmicro 0:7c694e032688 122 case LCD20x4:
elmicro 0:7c694e032688 123 switch (row) {
elmicro 0:7c694e032688 124 case 0:
elmicro 0:7c694e032688 125 return 0x80 + column;
elmicro 0:7c694e032688 126 case 1:
elmicro 0:7c694e032688 127 return 0xc0 + column;
elmicro 0:7c694e032688 128 case 2:
elmicro 0:7c694e032688 129 return 0x94 + column;
elmicro 0:7c694e032688 130 case 3:
elmicro 0:7c694e032688 131 return 0xd4 + column;
elmicro 0:7c694e032688 132 }
elmicro 0:7c694e032688 133 case LCD16x2B:
elmicro 0:7c694e032688 134 return 0x80 + (row * 40) + column;
elmicro 0:7c694e032688 135 case LCD16x2:
elmicro 0:7c694e032688 136 case LCD20x2:
elmicro 0:7c694e032688 137 default:
elmicro 0:7c694e032688 138 return 0x80 + (row * 0x40) + column;
elmicro 0:7c694e032688 139 }
elmicro 0:7c694e032688 140 }
elmicro 0:7c694e032688 141
elmicro 0:7c694e032688 142 int TextLCD::columns() {
elmicro 0:7c694e032688 143 switch (_type) {
elmicro 0:7c694e032688 144 case LCD20x4:
elmicro 0:7c694e032688 145 case LCD20x2:
elmicro 0:7c694e032688 146 return 20;
elmicro 0:7c694e032688 147 case LCD16x2:
elmicro 0:7c694e032688 148 case LCD16x2B:
elmicro 0:7c694e032688 149 default:
elmicro 0:7c694e032688 150 return 16;
elmicro 0:7c694e032688 151 }
elmicro 0:7c694e032688 152 }
elmicro 0:7c694e032688 153
elmicro 0:7c694e032688 154 int TextLCD::rows() {
elmicro 0:7c694e032688 155 switch (_type) {
elmicro 0:7c694e032688 156 case LCD20x4:
elmicro 0:7c694e032688 157 return 4;
elmicro 0:7c694e032688 158 case LCD16x2:
elmicro 0:7c694e032688 159 case LCD16x2B:
elmicro 0:7c694e032688 160 case LCD20x2:
elmicro 0:7c694e032688 161 default:
elmicro 0:7c694e032688 162 return 2;
elmicro 0:7c694e032688 163 }
elmicro 0:7c694e032688 164 }