Mike Pollock / Mbed 2 deprecated GT_Tuner3

Adapted code from original GT_Tuner code (by Andrew Durand) for a school project by Tapton School.

Dependencies:   mbed

TextLCD.cpp@2:c242fd25e7e2, 2017-02-06 (annotated)

Committer:
mptapton
Date:
Mon Feb 06 09:30:34 2017 +0000
Revision:
2:c242fd25e7e2
Parent:
0:6b0b61d411ad 
Tapton School guitar project

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mptapton 0:6b0b61d411ad 1 /* mbed TextLCD Library, for a 4-bit LCD based on HD44780
mptapton 0:6b0b61d411ad 2 * Copyright (c) 2007-2010, sford, http://mbed.org
mptapton 0:6b0b61d411ad 3 *
mptapton 0:6b0b61d411ad 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
mptapton 0:6b0b61d411ad 5 * of this software and associated documentation files (the "Software"), to deal
mptapton 0:6b0b61d411ad 6 * in the Software without restriction, including without limitation the rights
mptapton 0:6b0b61d411ad 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
mptapton 0:6b0b61d411ad 8 * copies of the Software, and to permit persons to whom the Software is
mptapton 0:6b0b61d411ad 9 * furnished to do so, subject to the following conditions:
mptapton 0:6b0b61d411ad 10 *
mptapton 0:6b0b61d411ad 11 * The above copyright notice and this permission notice shall be included in
mptapton 0:6b0b61d411ad 12 * all copies or substantial portions of the Software.
mptapton 0:6b0b61d411ad 13 *
mptapton 0:6b0b61d411ad 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
mptapton 0:6b0b61d411ad 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
mptapton 0:6b0b61d411ad 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
mptapton 0:6b0b61d411ad 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
mptapton 0:6b0b61d411ad 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
mptapton 0:6b0b61d411ad 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
mptapton 0:6b0b61d411ad 20 * THE SOFTWARE.
mptapton 0:6b0b61d411ad 21 */
mptapton 0:6b0b61d411ad 22
mptapton 0:6b0b61d411ad 23 #include "TextLCD.h"
mptapton 0:6b0b61d411ad 24 #include "mbed.h"
mptapton 0:6b0b61d411ad 25
mptapton 0:6b0b61d411ad 26 TextLCD::TextLCD(PinName rs, PinName e, PinName d4, PinName d5,
mptapton 0:6b0b61d411ad 27 PinName d6, PinName d7, LCDType type) : _rs(rs),
mptapton 0:6b0b61d411ad 28 _e(e), _d(d4, d5, d6, d7),
mptapton 0:6b0b61d411ad 29 _type(type) {
mptapton 0:6b0b61d411ad 30
mptapton 0:6b0b61d411ad 31 _e = 1;
mptapton 0:6b0b61d411ad 32 _rs = 0; // command mode
mptapton 0:6b0b61d411ad 33
mptapton 0:6b0b61d411ad 34 wait(0.015); // Wait 15ms to ensure powered up
mptapton 0:6b0b61d411ad 35
mptapton 0:6b0b61d411ad 36 // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus)
mptapton 0:6b0b61d411ad 37 for (int i=0; i<3; i++) {
mptapton 0:6b0b61d411ad 38 writeByte(0x3);
mptapton 0:6b0b61d411ad 39 wait(0.00164); // this command takes 1.64ms, so wait for it
mptapton 0:6b0b61d411ad 40 }
mptapton 0:6b0b61d411ad 41 writeByte(0x2); // 4-bit mode
mptapton 0:6b0b61d411ad 42 wait(0.000040f); // most instructions take 40us
mptapton 0:6b0b61d411ad 43
mptapton 0:6b0b61d411ad 44 writeCommand(0x28); // Function set 001 BW N F - -
mptapton 0:6b0b61d411ad 45 writeCommand(0x0C);
mptapton 0:6b0b61d411ad 46 writeCommand(0x6); // Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes
mptapton 0:6b0b61d411ad 47 cls();
mptapton 0:6b0b61d411ad 48 }
mptapton 0:6b0b61d411ad 49
mptapton 0:6b0b61d411ad 50 void TextLCD::character(int column, int row, int c) {
mptapton 0:6b0b61d411ad 51 int a = address(column, row);
mptapton 0:6b0b61d411ad 52 writeCommand(a);
mptapton 0:6b0b61d411ad 53 writeData(c);
mptapton 0:6b0b61d411ad 54 }
mptapton 0:6b0b61d411ad 55
mptapton 0:6b0b61d411ad 56 void TextLCD::cls() {
mptapton 0:6b0b61d411ad 57 writeCommand(0x01); // cls, and set cursor to 0
mptapton 0:6b0b61d411ad 58 wait(0.00164f); // This command takes 1.64 ms
mptapton 0:6b0b61d411ad 59 locate(0, 0);
mptapton 0:6b0b61d411ad 60 }
mptapton 0:6b0b61d411ad 61
mptapton 0:6b0b61d411ad 62 void TextLCD::locate(int column, int row) {
mptapton 0:6b0b61d411ad 63 _column = column;
mptapton 0:6b0b61d411ad 64 _row = row;
mptapton 0:6b0b61d411ad 65 }
mptapton 0:6b0b61d411ad 66
mptapton 0:6b0b61d411ad 67 int TextLCD::_putc(int value) {
mptapton 0:6b0b61d411ad 68 if (value == '\n') {
mptapton 0:6b0b61d411ad 69 _column = 0;
mptapton 0:6b0b61d411ad 70 _row++;
mptapton 0:6b0b61d411ad 71 if (_row >= rows()) {
mptapton 0:6b0b61d411ad 72 _row = 0;
mptapton 0:6b0b61d411ad 73 }
mptapton 0:6b0b61d411ad 74 } else {
mptapton 0:6b0b61d411ad 75 character(_column, _row, value);
mptapton 0:6b0b61d411ad 76 _column++;
mptapton 0:6b0b61d411ad 77 if (_column >= columns()) {
mptapton 0:6b0b61d411ad 78 _column = 0;
mptapton 0:6b0b61d411ad 79 _row++;
mptapton 0:6b0b61d411ad 80 if (_row >= rows()) {
mptapton 0:6b0b61d411ad 81 _row = 0;
mptapton 0:6b0b61d411ad 82 }
mptapton 0:6b0b61d411ad 83 }
mptapton 0:6b0b61d411ad 84 }
mptapton 0:6b0b61d411ad 85 return value;
mptapton 0:6b0b61d411ad 86 }
mptapton 0:6b0b61d411ad 87
mptapton 0:6b0b61d411ad 88 int TextLCD::_getc() {
mptapton 0:6b0b61d411ad 89 return -1;
mptapton 0:6b0b61d411ad 90 }
mptapton 0:6b0b61d411ad 91
mptapton 0:6b0b61d411ad 92 void TextLCD::writeByte(int value) {
mptapton 0:6b0b61d411ad 93 _d = value >> 4;
mptapton 0:6b0b61d411ad 94 wait(0.000040f); // most instructions take 40us
mptapton 0:6b0b61d411ad 95 _e = 0;
mptapton 0:6b0b61d411ad 96 wait(0.000040f);
mptapton 0:6b0b61d411ad 97 _e = 1;
mptapton 0:6b0b61d411ad 98 _d = value >> 0;
mptapton 0:6b0b61d411ad 99 wait(0.000040f);
mptapton 0:6b0b61d411ad 100 _e = 0;
mptapton 0:6b0b61d411ad 101 wait(0.000040f); // most instructions take 40us
mptapton 0:6b0b61d411ad 102 _e = 1;
mptapton 0:6b0b61d411ad 103 }
mptapton 0:6b0b61d411ad 104
mptapton 0:6b0b61d411ad 105 void TextLCD::writeCommand(int command) {
mptapton 0:6b0b61d411ad 106 _rs = 0;
mptapton 0:6b0b61d411ad 107 writeByte(command);
mptapton 0:6b0b61d411ad 108 }
mptapton 0:6b0b61d411ad 109
mptapton 0:6b0b61d411ad 110 void TextLCD::writeData(int data) {
mptapton 0:6b0b61d411ad 111 _rs = 1;
mptapton 0:6b0b61d411ad 112 writeByte(data);
mptapton 0:6b0b61d411ad 113 }
mptapton 0:6b0b61d411ad 114
mptapton 0:6b0b61d411ad 115 int TextLCD::address(int column, int row) {
mptapton 0:6b0b61d411ad 116 switch (_type) {
mptapton 0:6b0b61d411ad 117 case LCD20x4:
mptapton 0:6b0b61d411ad 118 switch (row) {
mptapton 0:6b0b61d411ad 119 case 0:
mptapton 0:6b0b61d411ad 120 return 0x80 + column;
mptapton 0:6b0b61d411ad 121 case 1:
mptapton 0:6b0b61d411ad 122 return 0xc0 + column;
mptapton 0:6b0b61d411ad 123 case 2:
mptapton 0:6b0b61d411ad 124 return 0x94 + column;
mptapton 0:6b0b61d411ad 125 case 3:
mptapton 0:6b0b61d411ad 126 return 0xd4 + column;
mptapton 0:6b0b61d411ad 127 }
mptapton 0:6b0b61d411ad 128 case LCD16x2B:
mptapton 0:6b0b61d411ad 129 return 0x80 + (row * 40) + column;
mptapton 0:6b0b61d411ad 130 case LCD16x2:
mptapton 0:6b0b61d411ad 131 case LCD20x2:
mptapton 0:6b0b61d411ad 132 default:
mptapton 0:6b0b61d411ad 133 return 0x80 + (row * 0x40) + column;
mptapton 0:6b0b61d411ad 134 }
mptapton 0:6b0b61d411ad 135 }
mptapton 0:6b0b61d411ad 136
mptapton 0:6b0b61d411ad 137 int TextLCD::columns() {
mptapton 0:6b0b61d411ad 138 switch (_type) {
mptapton 0:6b0b61d411ad 139 case LCD20x4:
mptapton 0:6b0b61d411ad 140 case LCD20x2:
mptapton 0:6b0b61d411ad 141 return 20;
mptapton 0:6b0b61d411ad 142 case LCD16x2:
mptapton 0:6b0b61d411ad 143 case LCD16x2B:
mptapton 0:6b0b61d411ad 144 default:
mptapton 0:6b0b61d411ad 145 return 16;
mptapton 0:6b0b61d411ad 146 }
mptapton 0:6b0b61d411ad 147 }
mptapton 0:6b0b61d411ad 148
mptapton 0:6b0b61d411ad 149 int TextLCD::rows() {
mptapton 0:6b0b61d411ad 150 switch (_type) {
mptapton 0:6b0b61d411ad 151 case LCD20x4:
mptapton 0:6b0b61d411ad 152 return 4;
mptapton 0:6b0b61d411ad 153 case LCD16x2:
mptapton 0:6b0b61d411ad 154 case LCD16x2B:
mptapton 0:6b0b61d411ad 155 case LCD20x2:
mptapton 0:6b0b61d411ad 156 default:
mptapton 0:6b0b61d411ad 157 return 2;
mptapton 0:6b0b61d411ad 158 }
mptapton 0:6b0b61d411ad 159 }