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SMART CLEO Smart Aircon

TextLCD/TextLCD.cpp@0:c5ba7cb9a63e, 2017-12-06 (annotated)

Committer:
SMART_CLEO
Date:
Wed Dec 06 08:53:58 2017 +0000
Revision:
0:c5ba7cb9a63e
SMART_CLEO

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SMART_CLEO 0:c5ba7cb9a63e 1 /* mbed TextLCD Library, for a 4-bit LCD based on HD44780
SMART_CLEO 0:c5ba7cb9a63e 2 * Copyright (c) 2007-2010, sford
SMART_CLEO 0:c5ba7cb9a63e 3 *
SMART_CLEO 0:c5ba7cb9a63e 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
SMART_CLEO 0:c5ba7cb9a63e 5 * of this software and associated documentation files (the "Software"), to deal
SMART_CLEO 0:c5ba7cb9a63e 6 * in the Software without restriction, including without limitation the rights
SMART_CLEO 0:c5ba7cb9a63e 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
SMART_CLEO 0:c5ba7cb9a63e 8 * copies of the Software, and to permit persons to whom the Software is
SMART_CLEO 0:c5ba7cb9a63e 9 * furnished to do so, subject to the following conditions:
SMART_CLEO 0:c5ba7cb9a63e 10 *
SMART_CLEO 0:c5ba7cb9a63e 11 * The above copyright notice and this permission notice shall be included in
SMART_CLEO 0:c5ba7cb9a63e 12 * all copies or substantial portions of the Software.
SMART_CLEO 0:c5ba7cb9a63e 13 *
SMART_CLEO 0:c5ba7cb9a63e 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
SMART_CLEO 0:c5ba7cb9a63e 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
SMART_CLEO 0:c5ba7cb9a63e 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
SMART_CLEO 0:c5ba7cb9a63e 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
SMART_CLEO 0:c5ba7cb9a63e 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
SMART_CLEO 0:c5ba7cb9a63e 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
SMART_CLEO 0:c5ba7cb9a63e 20 * THE SOFTWARE.
SMART_CLEO 0:c5ba7cb9a63e 21 */
SMART_CLEO 0:c5ba7cb9a63e 22
SMART_CLEO 0:c5ba7cb9a63e 23 #include "TextLCD.h"
SMART_CLEO 0:c5ba7cb9a63e 24 #include "mbed.h"
SMART_CLEO 0:c5ba7cb9a63e 25
SMART_CLEO 0:c5ba7cb9a63e 26 TextLCD::TextLCD(PinName rs, PinName rw, PinName e, PinName d0, PinName d1,
SMART_CLEO 0:c5ba7cb9a63e 27 PinName d2, PinName d3, LCDType type) : _rs(rs), _rw(rw),
SMART_CLEO 0:c5ba7cb9a63e 28 _e(e), _d(d0, d1, d2, d3),
SMART_CLEO 0:c5ba7cb9a63e 29 _type(type) {
SMART_CLEO 0:c5ba7cb9a63e 30
SMART_CLEO 0:c5ba7cb9a63e 31 _rw = 0;
SMART_CLEO 0:c5ba7cb9a63e 32 _e = 1;
SMART_CLEO 0:c5ba7cb9a63e 33 _rs = 0; // command mode
SMART_CLEO 0:c5ba7cb9a63e 34 _d.output();
SMART_CLEO 0:c5ba7cb9a63e 35
SMART_CLEO 0:c5ba7cb9a63e 36 wait(0.015); // Wait 15ms to ensure powered up
SMART_CLEO 0:c5ba7cb9a63e 37
SMART_CLEO 0:c5ba7cb9a63e 38 // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus)
SMART_CLEO 0:c5ba7cb9a63e 39 for (int i=0; i<3; i++) {
SMART_CLEO 0:c5ba7cb9a63e 40 writeByte(0x3);
SMART_CLEO 0:c5ba7cb9a63e 41 wait(0.00164); // this command takes 1.64ms, so wait for it
SMART_CLEO 0:c5ba7cb9a63e 42 }
SMART_CLEO 0:c5ba7cb9a63e 43 writeByte(0x2); // 4-bit mode
SMART_CLEO 0:c5ba7cb9a63e 44 wait(0.000040f); // most instructions take 40us
SMART_CLEO 0:c5ba7cb9a63e 45
SMART_CLEO 0:c5ba7cb9a63e 46 writeCommand(0x28); // Function set 001 BW N F - -
SMART_CLEO 0:c5ba7cb9a63e 47 writeCommand(0x0C);
SMART_CLEO 0:c5ba7cb9a63e 48 writeCommand(0x6); // Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes
SMART_CLEO 0:c5ba7cb9a63e 49 cls();
SMART_CLEO 0:c5ba7cb9a63e 50 }
SMART_CLEO 0:c5ba7cb9a63e 51
SMART_CLEO 0:c5ba7cb9a63e 52 void TextLCD::character(int column, int row, int c) {
SMART_CLEO 0:c5ba7cb9a63e 53 int a = address(column, row);
SMART_CLEO 0:c5ba7cb9a63e 54 writeCommand(a);
SMART_CLEO 0:c5ba7cb9a63e 55 writeData(c);
SMART_CLEO 0:c5ba7cb9a63e 56 }
SMART_CLEO 0:c5ba7cb9a63e 57
SMART_CLEO 0:c5ba7cb9a63e 58 void TextLCD::cls() {
SMART_CLEO 0:c5ba7cb9a63e 59 writeCommand(0x01); // cls, and set cursor to 0
SMART_CLEO 0:c5ba7cb9a63e 60 wait(0.00164f); // This command takes 1.64 ms
SMART_CLEO 0:c5ba7cb9a63e 61 locate(0, 0);
SMART_CLEO 0:c5ba7cb9a63e 62 }
SMART_CLEO 0:c5ba7cb9a63e 63
SMART_CLEO 0:c5ba7cb9a63e 64 void TextLCD::locate(int column, int row) {
SMART_CLEO 0:c5ba7cb9a63e 65 _column = column;
SMART_CLEO 0:c5ba7cb9a63e 66 _row = row;
SMART_CLEO 0:c5ba7cb9a63e 67 }
SMART_CLEO 0:c5ba7cb9a63e 68
SMART_CLEO 0:c5ba7cb9a63e 69 int TextLCD::_putc(int value) {
SMART_CLEO 0:c5ba7cb9a63e 70 if (value == '\n') {
SMART_CLEO 0:c5ba7cb9a63e 71 _column = 0;
SMART_CLEO 0:c5ba7cb9a63e 72 _row++;
SMART_CLEO 0:c5ba7cb9a63e 73 if (_row >= rows()) {
SMART_CLEO 0:c5ba7cb9a63e 74 _row = 0;
SMART_CLEO 0:c5ba7cb9a63e 75 }
SMART_CLEO 0:c5ba7cb9a63e 76 } else {
SMART_CLEO 0:c5ba7cb9a63e 77 character(_column, _row, value);
SMART_CLEO 0:c5ba7cb9a63e 78 _column++;
SMART_CLEO 0:c5ba7cb9a63e 79 if (_column >= columns()) {
SMART_CLEO 0:c5ba7cb9a63e 80 _column = 0;
SMART_CLEO 0:c5ba7cb9a63e 81 _row++;
SMART_CLEO 0:c5ba7cb9a63e 82 if (_row >= rows()) {
SMART_CLEO 0:c5ba7cb9a63e 83 _row = 0;
SMART_CLEO 0:c5ba7cb9a63e 84 }
SMART_CLEO 0:c5ba7cb9a63e 85 }
SMART_CLEO 0:c5ba7cb9a63e 86 }
SMART_CLEO 0:c5ba7cb9a63e 87 return value;
SMART_CLEO 0:c5ba7cb9a63e 88 }
SMART_CLEO 0:c5ba7cb9a63e 89
SMART_CLEO 0:c5ba7cb9a63e 90 int TextLCD::_getc() {
SMART_CLEO 0:c5ba7cb9a63e 91 return -1;
SMART_CLEO 0:c5ba7cb9a63e 92 }
SMART_CLEO 0:c5ba7cb9a63e 93
SMART_CLEO 0:c5ba7cb9a63e 94 void TextLCD::writeByte(int value) {
SMART_CLEO 0:c5ba7cb9a63e 95 _rw = 0;
SMART_CLEO 0:c5ba7cb9a63e 96
SMART_CLEO 0:c5ba7cb9a63e 97 _d = value >> 4;
SMART_CLEO 0:c5ba7cb9a63e 98 wait(0.000040f); // most instructions take 40us
SMART_CLEO 0:c5ba7cb9a63e 99 _e = 0;
SMART_CLEO 0:c5ba7cb9a63e 100 wait(0.000040f);
SMART_CLEO 0:c5ba7cb9a63e 101 _e = 1;
SMART_CLEO 0:c5ba7cb9a63e 102 _d = value >> 0;
SMART_CLEO 0:c5ba7cb9a63e 103 wait(0.000040f);
SMART_CLEO 0:c5ba7cb9a63e 104 _e = 0;
SMART_CLEO 0:c5ba7cb9a63e 105 wait(0.000040f); // most instructions take 40us
SMART_CLEO 0:c5ba7cb9a63e 106 _e = 1;
SMART_CLEO 0:c5ba7cb9a63e 107 }
SMART_CLEO 0:c5ba7cb9a63e 108
SMART_CLEO 0:c5ba7cb9a63e 109 void TextLCD::writeCommand(int command) {
SMART_CLEO 0:c5ba7cb9a63e 110 _rs = 0;
SMART_CLEO 0:c5ba7cb9a63e 111 writeByte(command);
SMART_CLEO 0:c5ba7cb9a63e 112 }
SMART_CLEO 0:c5ba7cb9a63e 113
SMART_CLEO 0:c5ba7cb9a63e 114 void TextLCD::writeData(int data) {
SMART_CLEO 0:c5ba7cb9a63e 115 _rs = 1;
SMART_CLEO 0:c5ba7cb9a63e 116 writeByte(data);
SMART_CLEO 0:c5ba7cb9a63e 117 }
SMART_CLEO 0:c5ba7cb9a63e 118
SMART_CLEO 0:c5ba7cb9a63e 119 int TextLCD::address(int column, int row) {
SMART_CLEO 0:c5ba7cb9a63e 120 switch (_type) {
SMART_CLEO 0:c5ba7cb9a63e 121 case LCD20x4:
SMART_CLEO 0:c5ba7cb9a63e 122 switch (row) {
SMART_CLEO 0:c5ba7cb9a63e 123 case 0:
SMART_CLEO 0:c5ba7cb9a63e 124 return 0x80 + column;
SMART_CLEO 0:c5ba7cb9a63e 125 case 1:
SMART_CLEO 0:c5ba7cb9a63e 126 return 0xc0 + column;
SMART_CLEO 0:c5ba7cb9a63e 127 case 2:
SMART_CLEO 0:c5ba7cb9a63e 128 return 0x94 + column;
SMART_CLEO 0:c5ba7cb9a63e 129 case 3:
SMART_CLEO 0:c5ba7cb9a63e 130 return 0xd4 + column;
SMART_CLEO 0:c5ba7cb9a63e 131 }
SMART_CLEO 0:c5ba7cb9a63e 132 case LCD16x2B:
SMART_CLEO 0:c5ba7cb9a63e 133 return 0x80 + (row * 40) + column;
SMART_CLEO 0:c5ba7cb9a63e 134 case LCD16x2:
SMART_CLEO 0:c5ba7cb9a63e 135 case LCD20x2:
SMART_CLEO 0:c5ba7cb9a63e 136 default:
SMART_CLEO 0:c5ba7cb9a63e 137 return 0x80 + (row * 0x40) + column;
SMART_CLEO 0:c5ba7cb9a63e 138 }
SMART_CLEO 0:c5ba7cb9a63e 139 }
SMART_CLEO 0:c5ba7cb9a63e 140
SMART_CLEO 0:c5ba7cb9a63e 141 int TextLCD::columns() {
SMART_CLEO 0:c5ba7cb9a63e 142 switch (_type) {
SMART_CLEO 0:c5ba7cb9a63e 143 case LCD20x4:
SMART_CLEO 0:c5ba7cb9a63e 144 case LCD20x2:
SMART_CLEO 0:c5ba7cb9a63e 145 return 20;
SMART_CLEO 0:c5ba7cb9a63e 146 case LCD16x2:
SMART_CLEO 0:c5ba7cb9a63e 147 case LCD16x2B:
SMART_CLEO 0:c5ba7cb9a63e 148 default:
SMART_CLEO 0:c5ba7cb9a63e 149 return 16;
SMART_CLEO 0:c5ba7cb9a63e 150 }
SMART_CLEO 0:c5ba7cb9a63e 151 }
SMART_CLEO 0:c5ba7cb9a63e 152
SMART_CLEO 0:c5ba7cb9a63e 153 int TextLCD::rows() {
SMART_CLEO 0:c5ba7cb9a63e 154 switch (_type) {
SMART_CLEO 0:c5ba7cb9a63e 155 case LCD20x4:
SMART_CLEO 0:c5ba7cb9a63e 156 return 4;
SMART_CLEO 0:c5ba7cb9a63e 157 case LCD16x2:
SMART_CLEO 0:c5ba7cb9a63e 158 case LCD16x2B:
SMART_CLEO 0:c5ba7cb9a63e 159 case LCD20x2:
SMART_CLEO 0:c5ba7cb9a63e 160 default:
SMART_CLEO 0:c5ba7cb9a63e 161 return 2;
SMART_CLEO 0:c5ba7cb9a63e 162 }
SMART_CLEO 0:c5ba7cb9a63e 163 }