CRISTIAN YOMAYUZA / Mbed 2 deprecated Teclado_lcd

Teclado con lcd

Dependencies:   mbed

TextLCD.cpp@0:2b5a34cdd26d, 2017-09-16 (annotated)

Committer:
cristiany
Date:
Sat Sep 16 21:55:50 2017 +0000
Revision:
0:2b5a34cdd26d
Teclado matricial con lcd;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
cristiany 0:2b5a34cdd26d 1 /* mbed TextLCD Library, for a 4-bit LCD based on HD44780
cristiany 0:2b5a34cdd26d 2 * Copyright (c) 2007-2010, sford, http://mbed.org
cristiany 0:2b5a34cdd26d 3 *
cristiany 0:2b5a34cdd26d 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
cristiany 0:2b5a34cdd26d 5 * of this software and associated documentation files (the "Software"), to deal
cristiany 0:2b5a34cdd26d 6 * in the Software without restriction, including without limitation the rights
cristiany 0:2b5a34cdd26d 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
cristiany 0:2b5a34cdd26d 8 * copies of the Software, and to permit persons to whom the Software is
cristiany 0:2b5a34cdd26d 9 * furnished to do so, subject to the following conditions:
cristiany 0:2b5a34cdd26d 10 *
cristiany 0:2b5a34cdd26d 11 * The above copyright notice and this permission notice shall be included in
cristiany 0:2b5a34cdd26d 12 * all copies or substantial portions of the Software.
cristiany 0:2b5a34cdd26d 13 *
cristiany 0:2b5a34cdd26d 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
cristiany 0:2b5a34cdd26d 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
cristiany 0:2b5a34cdd26d 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
cristiany 0:2b5a34cdd26d 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
cristiany 0:2b5a34cdd26d 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
cristiany 0:2b5a34cdd26d 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
cristiany 0:2b5a34cdd26d 20 * THE SOFTWARE.
cristiany 0:2b5a34cdd26d 21 */
cristiany 0:2b5a34cdd26d 22
cristiany 0:2b5a34cdd26d 23 #include "TextLCD.h"
cristiany 0:2b5a34cdd26d 24 #include "mbed.h"
cristiany 0:2b5a34cdd26d 25
cristiany 0:2b5a34cdd26d 26 TextLCD::TextLCD(PinName rs, PinName e, PinName d4, PinName d5,
cristiany 0:2b5a34cdd26d 27 PinName d6, PinName d7, LCDType type) : _rs(rs),
cristiany 0:2b5a34cdd26d 28 _e(e), _d(d4, d5, d6, d7),
cristiany 0:2b5a34cdd26d 29 _type(type) {
cristiany 0:2b5a34cdd26d 30
cristiany 0:2b5a34cdd26d 31 _e = 1;
cristiany 0:2b5a34cdd26d 32 _rs = 0; // command mode
cristiany 0:2b5a34cdd26d 33
cristiany 0:2b5a34cdd26d 34 wait(0.015); // Wait 15ms to ensure powered up
cristiany 0:2b5a34cdd26d 35
cristiany 0:2b5a34cdd26d 36 // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus)
cristiany 0:2b5a34cdd26d 37 for (int i=0; i<3; i++) {
cristiany 0:2b5a34cdd26d 38 writeByte(0x3);
cristiany 0:2b5a34cdd26d 39 wait(0.00164); // this command takes 1.64ms, so wait for it
cristiany 0:2b5a34cdd26d 40 }
cristiany 0:2b5a34cdd26d 41 writeByte(0x2); // 4-bit mode
cristiany 0:2b5a34cdd26d 42 wait(0.000040f); // most instructions take 40us
cristiany 0:2b5a34cdd26d 43
cristiany 0:2b5a34cdd26d 44 writeCommand(0x28); // Function set 001 BW N F - -
cristiany 0:2b5a34cdd26d 45 writeCommand(0x0C);
cristiany 0:2b5a34cdd26d 46 writeCommand(0x6); // Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes
cristiany 0:2b5a34cdd26d 47 cls();
cristiany 0:2b5a34cdd26d 48 }
cristiany 0:2b5a34cdd26d 49
cristiany 0:2b5a34cdd26d 50 void TextLCD::character(int column, int row, int c) {
cristiany 0:2b5a34cdd26d 51 int a = address(column, row);
cristiany 0:2b5a34cdd26d 52 writeCommand(a);
cristiany 0:2b5a34cdd26d 53 writeData(c);
cristiany 0:2b5a34cdd26d 54 }
cristiany 0:2b5a34cdd26d 55
cristiany 0:2b5a34cdd26d 56 void TextLCD::cls() {
cristiany 0:2b5a34cdd26d 57 writeCommand(0x01); // cls, and set cursor to 0
cristiany 0:2b5a34cdd26d 58 wait(0.00164f); // This command takes 1.64 ms
cristiany 0:2b5a34cdd26d 59 locate(0, 0);
cristiany 0:2b5a34cdd26d 60 }
cristiany 0:2b5a34cdd26d 61
cristiany 0:2b5a34cdd26d 62 void TextLCD::locate(int column, int row) {
cristiany 0:2b5a34cdd26d 63 _column = column;
cristiany 0:2b5a34cdd26d 64 _row = row;
cristiany 0:2b5a34cdd26d 65 }
cristiany 0:2b5a34cdd26d 66
cristiany 0:2b5a34cdd26d 67 int TextLCD::_putc(int value) {
cristiany 0:2b5a34cdd26d 68 if (value == '\n') {
cristiany 0:2b5a34cdd26d 69 _column = 0;
cristiany 0:2b5a34cdd26d 70 _row++;
cristiany 0:2b5a34cdd26d 71 if (_row >= rows()) {
cristiany 0:2b5a34cdd26d 72 _row = 0;
cristiany 0:2b5a34cdd26d 73 }
cristiany 0:2b5a34cdd26d 74 } else {
cristiany 0:2b5a34cdd26d 75 character(_column, _row, value);
cristiany 0:2b5a34cdd26d 76 _column++;
cristiany 0:2b5a34cdd26d 77 if (_column >= columns()) {
cristiany 0:2b5a34cdd26d 78 _column = 0;
cristiany 0:2b5a34cdd26d 79 _row++;
cristiany 0:2b5a34cdd26d 80 if (_row >= rows()) {
cristiany 0:2b5a34cdd26d 81 _row = 0;
cristiany 0:2b5a34cdd26d 82 }
cristiany 0:2b5a34cdd26d 83 }
cristiany 0:2b5a34cdd26d 84 }
cristiany 0:2b5a34cdd26d 85 return value;
cristiany 0:2b5a34cdd26d 86 }
cristiany 0:2b5a34cdd26d 87
cristiany 0:2b5a34cdd26d 88 int TextLCD::_getc() {
cristiany 0:2b5a34cdd26d 89 return -1;
cristiany 0:2b5a34cdd26d 90 }
cristiany 0:2b5a34cdd26d 91
cristiany 0:2b5a34cdd26d 92 void TextLCD::writeByte(int value) {
cristiany 0:2b5a34cdd26d 93 _d = value >> 4;
cristiany 0:2b5a34cdd26d 94 wait(0.000040f); // most instructions take 40us
cristiany 0:2b5a34cdd26d 95 _e = 0;
cristiany 0:2b5a34cdd26d 96 wait(0.000040f);
cristiany 0:2b5a34cdd26d 97 _e = 1;
cristiany 0:2b5a34cdd26d 98 _d = value >> 0;
cristiany 0:2b5a34cdd26d 99 wait(0.000040f);
cristiany 0:2b5a34cdd26d 100 _e = 0;
cristiany 0:2b5a34cdd26d 101 wait(0.000040f); // most instructions take 40us
cristiany 0:2b5a34cdd26d 102 _e = 1;
cristiany 0:2b5a34cdd26d 103 }
cristiany 0:2b5a34cdd26d 104
cristiany 0:2b5a34cdd26d 105 void TextLCD::writeCommand(int command) {
cristiany 0:2b5a34cdd26d 106 _rs = 0;
cristiany 0:2b5a34cdd26d 107 writeByte(command);
cristiany 0:2b5a34cdd26d 108 }
cristiany 0:2b5a34cdd26d 109
cristiany 0:2b5a34cdd26d 110 void TextLCD::writeData(int data) {
cristiany 0:2b5a34cdd26d 111 _rs = 1;
cristiany 0:2b5a34cdd26d 112 writeByte(data);
cristiany 0:2b5a34cdd26d 113 }
cristiany 0:2b5a34cdd26d 114
cristiany 0:2b5a34cdd26d 115 int TextLCD::address(int column, int row) {
cristiany 0:2b5a34cdd26d 116 switch (_type) {
cristiany 0:2b5a34cdd26d 117 case LCD20x4:
cristiany 0:2b5a34cdd26d 118 switch (row) {
cristiany 0:2b5a34cdd26d 119 case 0:
cristiany 0:2b5a34cdd26d 120 return 0x80 + column;
cristiany 0:2b5a34cdd26d 121 case 1:
cristiany 0:2b5a34cdd26d 122 return 0xc0 + column;
cristiany 0:2b5a34cdd26d 123 case 2:
cristiany 0:2b5a34cdd26d 124 return 0x94 + column;
cristiany 0:2b5a34cdd26d 125 case 3:
cristiany 0:2b5a34cdd26d 126 return 0xd4 + column;
cristiany 0:2b5a34cdd26d 127 }
cristiany 0:2b5a34cdd26d 128 case LCD16x2B:
cristiany 0:2b5a34cdd26d 129 return 0x80 + (row * 40) + column;
cristiany 0:2b5a34cdd26d 130 case LCD16x2:
cristiany 0:2b5a34cdd26d 131 case LCD20x2:
cristiany 0:2b5a34cdd26d 132 default:
cristiany 0:2b5a34cdd26d 133 return 0x80 + (row * 0x40) + column;
cristiany 0:2b5a34cdd26d 134 }
cristiany 0:2b5a34cdd26d 135 }
cristiany 0:2b5a34cdd26d 136
cristiany 0:2b5a34cdd26d 137 int TextLCD::columns() {
cristiany 0:2b5a34cdd26d 138 switch (_type) {
cristiany 0:2b5a34cdd26d 139 case LCD20x4:
cristiany 0:2b5a34cdd26d 140 case LCD20x2:
cristiany 0:2b5a34cdd26d 141 return 20;
cristiany 0:2b5a34cdd26d 142 case LCD16x2:
cristiany 0:2b5a34cdd26d 143 case LCD16x2B:
cristiany 0:2b5a34cdd26d 144 default:
cristiany 0:2b5a34cdd26d 145 return 16;
cristiany 0:2b5a34cdd26d 146 }
cristiany 0:2b5a34cdd26d 147 }
cristiany 0:2b5a34cdd26d 148
cristiany 0:2b5a34cdd26d 149 int TextLCD::rows() {
cristiany 0:2b5a34cdd26d 150 switch (_type) {
cristiany 0:2b5a34cdd26d 151 case LCD20x4:
cristiany 0:2b5a34cdd26d 152 return 4;
cristiany 0:2b5a34cdd26d 153 case LCD16x2:
cristiany 0:2b5a34cdd26d 154 case LCD16x2B:
cristiany 0:2b5a34cdd26d 155 case LCD20x2:
cristiany 0:2b5a34cdd26d 156 default:
cristiany 0:2b5a34cdd26d 157 return 2;
cristiany 0:2b5a34cdd26d 158 }
cristiany 0:2b5a34cdd26d 159 }