eka sinambela / LinearAnalogSensors

add LCD

Fork of LinearAnalogSensors by Penn Electric

TextLCD.cpp@3:15afa310c137, 2016-06-14 (annotated)

Committer:
ekasinambela
Date:
Tue Jun 14 09:24:02 2016 +0000
Revision:
3:15afa310c137
add LCD

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ekasinambela 3:15afa310c137 1 /* mbed TextLCD Library, for a 4-bit LCD based on HD44780
ekasinambela 3:15afa310c137 2 * Copyright (c) 2007-2010, sford, http://mbed.org
ekasinambela 3:15afa310c137 3 *
ekasinambela 3:15afa310c137 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
ekasinambela 3:15afa310c137 5 * of this software and associated documentation files (the "Software"), to deal
ekasinambela 3:15afa310c137 6 * in the Software without restriction, including without limitation the rights
ekasinambela 3:15afa310c137 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
ekasinambela 3:15afa310c137 8 * copies of the Software, and to permit persons to whom the Software is
ekasinambela 3:15afa310c137 9 * furnished to do so, subject to the following conditions:
ekasinambela 3:15afa310c137 10 *
ekasinambela 3:15afa310c137 11 * The above copyright notice and this permission notice shall be included in
ekasinambela 3:15afa310c137 12 * all copies or substantial portions of the Software.
ekasinambela 3:15afa310c137 13 *
ekasinambela 3:15afa310c137 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
ekasinambela 3:15afa310c137 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
ekasinambela 3:15afa310c137 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
ekasinambela 3:15afa310c137 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
ekasinambela 3:15afa310c137 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
ekasinambela 3:15afa310c137 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
ekasinambela 3:15afa310c137 20 * THE SOFTWARE.
ekasinambela 3:15afa310c137 21 */
ekasinambela 3:15afa310c137 22
ekasinambela 3:15afa310c137 23 #include "TextLCD.h"
ekasinambela 3:15afa310c137 24 #include "mbed.h"
ekasinambela 3:15afa310c137 25
ekasinambela 3:15afa310c137 26 TextLCD::TextLCD(PinName rs, PinName e, PinName d4, PinName d5,
ekasinambela 3:15afa310c137 27 PinName d6, PinName d7, LCDType type) : _rs(rs),
ekasinambela 3:15afa310c137 28 _e(e), _d(d4, d5, d6, d7),
ekasinambela 3:15afa310c137 29 _type(type) {
ekasinambela 3:15afa310c137 30
ekasinambela 3:15afa310c137 31 _e = 1;
ekasinambela 3:15afa310c137 32 _rs = 0; // command mode
ekasinambela 3:15afa310c137 33
ekasinambela 3:15afa310c137 34 wait(0.015); // Wait 15ms to ensure powered up
ekasinambela 3:15afa310c137 35
ekasinambela 3:15afa310c137 36 // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus)
ekasinambela 3:15afa310c137 37 for (int i=0; i<3; i++) {
ekasinambela 3:15afa310c137 38 writeByte(0x3);
ekasinambela 3:15afa310c137 39 wait(0.00164); // this command takes 1.64ms, so wait for it
ekasinambela 3:15afa310c137 40 }
ekasinambela 3:15afa310c137 41 writeByte(0x2); // 4-bit mode
ekasinambela 3:15afa310c137 42 wait(0.000040f); // most instructions take 40us
ekasinambela 3:15afa310c137 43
ekasinambela 3:15afa310c137 44 writeCommand(0x28); // Function set 001 BW N F - -
ekasinambela 3:15afa310c137 45 writeCommand(0x0C);
ekasinambela 3:15afa310c137 46 writeCommand(0x6); // Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes
ekasinambela 3:15afa310c137 47 cls();
ekasinambela 3:15afa310c137 48 }
ekasinambela 3:15afa310c137 49
ekasinambela 3:15afa310c137 50 void TextLCD::character(int column, int row, int c) {
ekasinambela 3:15afa310c137 51 int a = address(column, row);
ekasinambela 3:15afa310c137 52 writeCommand(a);
ekasinambela 3:15afa310c137 53 writeData(c);
ekasinambela 3:15afa310c137 54 }
ekasinambela 3:15afa310c137 55
ekasinambela 3:15afa310c137 56 void TextLCD::cls() {
ekasinambela 3:15afa310c137 57 writeCommand(0x01); // cls, and set cursor to 0
ekasinambela 3:15afa310c137 58 wait(0.00164f); // This command takes 1.64 ms
ekasinambela 3:15afa310c137 59 locate(0, 0);
ekasinambela 3:15afa310c137 60 }
ekasinambela 3:15afa310c137 61
ekasinambela 3:15afa310c137 62 void TextLCD::locate(int column, int row) {
ekasinambela 3:15afa310c137 63 _column = column;
ekasinambela 3:15afa310c137 64 _row = row;
ekasinambela 3:15afa310c137 65 }
ekasinambela 3:15afa310c137 66
ekasinambela 3:15afa310c137 67 int TextLCD::_putc(int value) {
ekasinambela 3:15afa310c137 68 if (value == '\n') {
ekasinambela 3:15afa310c137 69 _column = 0;
ekasinambela 3:15afa310c137 70 _row++;
ekasinambela 3:15afa310c137 71 if (_row >= rows()) {
ekasinambela 3:15afa310c137 72 _row = 0;
ekasinambela 3:15afa310c137 73 }
ekasinambela 3:15afa310c137 74 } else {
ekasinambela 3:15afa310c137 75 character(_column, _row, value);
ekasinambela 3:15afa310c137 76 _column++;
ekasinambela 3:15afa310c137 77 if (_column >= columns()) {
ekasinambela 3:15afa310c137 78 _column = 0;
ekasinambela 3:15afa310c137 79 _row++;
ekasinambela 3:15afa310c137 80 if (_row >= rows()) {
ekasinambela 3:15afa310c137 81 _row = 0;
ekasinambela 3:15afa310c137 82 }
ekasinambela 3:15afa310c137 83 }
ekasinambela 3:15afa310c137 84 }
ekasinambela 3:15afa310c137 85 return value;
ekasinambela 3:15afa310c137 86 }
ekasinambela 3:15afa310c137 87
ekasinambela 3:15afa310c137 88 int TextLCD::_getc() {
ekasinambela 3:15afa310c137 89 return -1;
ekasinambela 3:15afa310c137 90 }
ekasinambela 3:15afa310c137 91
ekasinambela 3:15afa310c137 92 void TextLCD::writeByte(int value) {
ekasinambela 3:15afa310c137 93 _d = value >> 4;
ekasinambela 3:15afa310c137 94 wait(0.000040f); // most instructions take 40us
ekasinambela 3:15afa310c137 95 _e = 0;
ekasinambela 3:15afa310c137 96 wait(0.000040f);
ekasinambela 3:15afa310c137 97 _e = 1;
ekasinambela 3:15afa310c137 98 _d = value >> 0;
ekasinambela 3:15afa310c137 99 wait(0.000040f);
ekasinambela 3:15afa310c137 100 _e = 0;
ekasinambela 3:15afa310c137 101 wait(0.000040f); // most instructions take 40us
ekasinambela 3:15afa310c137 102 _e = 1;
ekasinambela 3:15afa310c137 103 }
ekasinambela 3:15afa310c137 104
ekasinambela 3:15afa310c137 105 void TextLCD::writeCommand(int command) {
ekasinambela 3:15afa310c137 106 _rs = 0;
ekasinambela 3:15afa310c137 107 writeByte(command);
ekasinambela 3:15afa310c137 108 }
ekasinambela 3:15afa310c137 109
ekasinambela 3:15afa310c137 110 void TextLCD::writeData(int data) {
ekasinambela 3:15afa310c137 111 _rs = 1;
ekasinambela 3:15afa310c137 112 writeByte(data);
ekasinambela 3:15afa310c137 113 }
ekasinambela 3:15afa310c137 114
ekasinambela 3:15afa310c137 115 int TextLCD::address(int column, int row) {
ekasinambela 3:15afa310c137 116 switch (_type) {
ekasinambela 3:15afa310c137 117 case LCD20x4:
ekasinambela 3:15afa310c137 118 switch (row) {
ekasinambela 3:15afa310c137 119 case 0:
ekasinambela 3:15afa310c137 120 return 0x80 + column;
ekasinambela 3:15afa310c137 121 case 1:
ekasinambela 3:15afa310c137 122 return 0xc0 + column;
ekasinambela 3:15afa310c137 123 case 2:
ekasinambela 3:15afa310c137 124 return 0x94 + column;
ekasinambela 3:15afa310c137 125 case 3:
ekasinambela 3:15afa310c137 126 return 0xd4 + column;
ekasinambela 3:15afa310c137 127 }
ekasinambela 3:15afa310c137 128 case LCD16x2B:
ekasinambela 3:15afa310c137 129 return 0x80 + (row * 40) + column;
ekasinambela 3:15afa310c137 130 case LCD16x2:
ekasinambela 3:15afa310c137 131 case LCD20x2:
ekasinambela 3:15afa310c137 132 default:
ekasinambela 3:15afa310c137 133 return 0x80 + (row * 0x40) + column;
ekasinambela 3:15afa310c137 134 }
ekasinambela 3:15afa310c137 135 }
ekasinambela 3:15afa310c137 136
ekasinambela 3:15afa310c137 137 int TextLCD::columns() {
ekasinambela 3:15afa310c137 138 switch (_type) {
ekasinambela 3:15afa310c137 139 case LCD20x4:
ekasinambela 3:15afa310c137 140 case LCD20x2:
ekasinambela 3:15afa310c137 141 return 20;
ekasinambela 3:15afa310c137 142 case LCD16x2:
ekasinambela 3:15afa310c137 143 case LCD16x2B:
ekasinambela 3:15afa310c137 144 default:
ekasinambela 3:15afa310c137 145 return 16;
ekasinambela 3:15afa310c137 146 }
ekasinambela 3:15afa310c137 147 }
ekasinambela 3:15afa310c137 148
ekasinambela 3:15afa310c137 149 int TextLCD::rows() {
ekasinambela 3:15afa310c137 150 switch (_type) {
ekasinambela 3:15afa310c137 151 case LCD20x4:
ekasinambela 3:15afa310c137 152 return 4;
ekasinambela 3:15afa310c137 153 case LCD16x2:
ekasinambela 3:15afa310c137 154 case LCD16x2B:
ekasinambela 3:15afa310c137 155 case LCD20x2:
ekasinambela 3:15afa310c137 156 default:
ekasinambela 3:15afa310c137 157 return 2;
ekasinambela 3:15afa310c137 158 }
ekasinambela 3:15afa310c137 159 }