eichi kowata / Mbed 2 deprecated geiger

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TextLCD/TextLCD.cpp@0:08a4d61cd84c, 2011-09-20 (annotated)

Committer:
mark2r2
Date:
Tue Sep 20 12:46:26 2011 +0000
Revision:
0:08a4d61cd84c
V1.0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mark2r2 0:08a4d61cd84c 1 /* mbed TextLCD Library, for a 4-bit LCD based on HD44780
mark2r2 0:08a4d61cd84c 2 * Copyright (c) 2007-2010, sford, http://mbed.org
mark2r2 0:08a4d61cd84c 3 *
mark2r2 0:08a4d61cd84c 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
mark2r2 0:08a4d61cd84c 5 * of this software and associated documentation files (the "Software"), to deal
mark2r2 0:08a4d61cd84c 6 * in the Software without restriction, including without limitation the rights
mark2r2 0:08a4d61cd84c 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
mark2r2 0:08a4d61cd84c 8 * copies of the Software, and to permit persons to whom the Software is
mark2r2 0:08a4d61cd84c 9 * furnished to do so, subject to the following conditions:
mark2r2 0:08a4d61cd84c 10 *
mark2r2 0:08a4d61cd84c 11 * The above copyright notice and this permission notice shall be included in
mark2r2 0:08a4d61cd84c 12 * all copies or substantial portions of the Software.
mark2r2 0:08a4d61cd84c 13 *
mark2r2 0:08a4d61cd84c 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
mark2r2 0:08a4d61cd84c 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
mark2r2 0:08a4d61cd84c 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
mark2r2 0:08a4d61cd84c 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
mark2r2 0:08a4d61cd84c 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
mark2r2 0:08a4d61cd84c 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
mark2r2 0:08a4d61cd84c 20 * THE SOFTWARE.
mark2r2 0:08a4d61cd84c 21 */
mark2r2 0:08a4d61cd84c 22
mark2r2 0:08a4d61cd84c 23 #include "TextLCD.h"
mark2r2 0:08a4d61cd84c 24 #include "mbed.h"
mark2r2 0:08a4d61cd84c 25
mark2r2 0:08a4d61cd84c 26 TextLCD::TextLCD(PinName rs, PinName e, PinName d4, PinName d5,
mark2r2 0:08a4d61cd84c 27 PinName d6, PinName d7, LCDType type) : _rs(rs),
mark2r2 0:08a4d61cd84c 28 _e(e), _d(d4, d5, d6, d7),
mark2r2 0:08a4d61cd84c 29 _type(type) {
mark2r2 0:08a4d61cd84c 30
mark2r2 0:08a4d61cd84c 31 _e = 1;
mark2r2 0:08a4d61cd84c 32 _rs = 0; // command mode
mark2r2 0:08a4d61cd84c 33
mark2r2 0:08a4d61cd84c 34 wait(0.015); // Wait 15ms to ensure powered up
mark2r2 0:08a4d61cd84c 35
mark2r2 0:08a4d61cd84c 36 // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus)
mark2r2 0:08a4d61cd84c 37 for (int i=0; i<3; i++) {
mark2r2 0:08a4d61cd84c 38 writeByte(0x3);
mark2r2 0:08a4d61cd84c 39 wait(0.00164); // this command takes 1.64ms, so wait for it
mark2r2 0:08a4d61cd84c 40 }
mark2r2 0:08a4d61cd84c 41 writeByte(0x2); // 4-bit mode
mark2r2 0:08a4d61cd84c 42 wait(0.000040f); // most instructions take 40us
mark2r2 0:08a4d61cd84c 43
mark2r2 0:08a4d61cd84c 44 writeCommand(0x28); // Function set 001 BW N F - -
mark2r2 0:08a4d61cd84c 45 writeCommand(0x0C);
mark2r2 0:08a4d61cd84c 46 writeCommand(0x6); // Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes
mark2r2 0:08a4d61cd84c 47 cls();
mark2r2 0:08a4d61cd84c 48 }
mark2r2 0:08a4d61cd84c 49
mark2r2 0:08a4d61cd84c 50 void TextLCD::character(int column, int row, int c) {
mark2r2 0:08a4d61cd84c 51 int a = address(column, row);
mark2r2 0:08a4d61cd84c 52 writeCommand(a);
mark2r2 0:08a4d61cd84c 53 writeData(c);
mark2r2 0:08a4d61cd84c 54 }
mark2r2 0:08a4d61cd84c 55
mark2r2 0:08a4d61cd84c 56 void TextLCD::cls() {
mark2r2 0:08a4d61cd84c 57 writeCommand(0x01); // cls, and set cursor to 0
mark2r2 0:08a4d61cd84c 58 wait(0.00164f); // This command takes 1.64 ms
mark2r2 0:08a4d61cd84c 59 locate(0, 0);
mark2r2 0:08a4d61cd84c 60 }
mark2r2 0:08a4d61cd84c 61
mark2r2 0:08a4d61cd84c 62 void TextLCD::locate(int column, int row) {
mark2r2 0:08a4d61cd84c 63 _column = column;
mark2r2 0:08a4d61cd84c 64 _row = row;
mark2r2 0:08a4d61cd84c 65 }
mark2r2 0:08a4d61cd84c 66
mark2r2 0:08a4d61cd84c 67 int TextLCD::_putc(int value) {
mark2r2 0:08a4d61cd84c 68 if (value == '\n') {
mark2r2 0:08a4d61cd84c 69 _column = 0;
mark2r2 0:08a4d61cd84c 70 _row++;
mark2r2 0:08a4d61cd84c 71 if (_row >= rows()) {
mark2r2 0:08a4d61cd84c 72 _row = 0;
mark2r2 0:08a4d61cd84c 73 }
mark2r2 0:08a4d61cd84c 74 } else {
mark2r2 0:08a4d61cd84c 75 character(_column, _row, value);
mark2r2 0:08a4d61cd84c 76 _column++;
mark2r2 0:08a4d61cd84c 77 if (_column >= columns()) {
mark2r2 0:08a4d61cd84c 78 _column = 0;
mark2r2 0:08a4d61cd84c 79 _row++;
mark2r2 0:08a4d61cd84c 80 if (_row >= rows()) {
mark2r2 0:08a4d61cd84c 81 _row = 0;
mark2r2 0:08a4d61cd84c 82 }
mark2r2 0:08a4d61cd84c 83 }
mark2r2 0:08a4d61cd84c 84 }
mark2r2 0:08a4d61cd84c 85 return value;
mark2r2 0:08a4d61cd84c 86 }
mark2r2 0:08a4d61cd84c 87
mark2r2 0:08a4d61cd84c 88 int TextLCD::_getc() {
mark2r2 0:08a4d61cd84c 89 return -1;
mark2r2 0:08a4d61cd84c 90 }
mark2r2 0:08a4d61cd84c 91
mark2r2 0:08a4d61cd84c 92 void TextLCD::writeByte(int value) {
mark2r2 0:08a4d61cd84c 93 _d = value >> 4;
mark2r2 0:08a4d61cd84c 94 wait(0.000040f); // most instructions take 40us
mark2r2 0:08a4d61cd84c 95 _e = 0;
mark2r2 0:08a4d61cd84c 96 wait(0.000040f);
mark2r2 0:08a4d61cd84c 97 _e = 1;
mark2r2 0:08a4d61cd84c 98 _d = value >> 0;
mark2r2 0:08a4d61cd84c 99 wait(0.000040f);
mark2r2 0:08a4d61cd84c 100 _e = 0;
mark2r2 0:08a4d61cd84c 101 wait(0.000040f); // most instructions take 40us
mark2r2 0:08a4d61cd84c 102 _e = 1;
mark2r2 0:08a4d61cd84c 103 }
mark2r2 0:08a4d61cd84c 104
mark2r2 0:08a4d61cd84c 105 void TextLCD::writeCommand(int command) {
mark2r2 0:08a4d61cd84c 106 _rs = 0;
mark2r2 0:08a4d61cd84c 107 writeByte(command);
mark2r2 0:08a4d61cd84c 108 }
mark2r2 0:08a4d61cd84c 109
mark2r2 0:08a4d61cd84c 110 void TextLCD::writeData(int data) {
mark2r2 0:08a4d61cd84c 111 _rs = 1;
mark2r2 0:08a4d61cd84c 112 writeByte(data);
mark2r2 0:08a4d61cd84c 113 }
mark2r2 0:08a4d61cd84c 114
mark2r2 0:08a4d61cd84c 115 int TextLCD::address(int column, int row) {
mark2r2 0:08a4d61cd84c 116 switch (_type) {
mark2r2 0:08a4d61cd84c 117 case LCD20x4:
mark2r2 0:08a4d61cd84c 118 switch (row) {
mark2r2 0:08a4d61cd84c 119 case 0:
mark2r2 0:08a4d61cd84c 120 return 0x80 + column;
mark2r2 0:08a4d61cd84c 121 case 1:
mark2r2 0:08a4d61cd84c 122 return 0xc0 + column;
mark2r2 0:08a4d61cd84c 123 case 2:
mark2r2 0:08a4d61cd84c 124 return 0x94 + column;
mark2r2 0:08a4d61cd84c 125 case 3:
mark2r2 0:08a4d61cd84c 126 return 0xd4 + column;
mark2r2 0:08a4d61cd84c 127 }
mark2r2 0:08a4d61cd84c 128 case LCD16x2B:
mark2r2 0:08a4d61cd84c 129 return 0x80 + (row * 40) + column;
mark2r2 0:08a4d61cd84c 130 case LCD16x2:
mark2r2 0:08a4d61cd84c 131 case LCD20x2:
mark2r2 0:08a4d61cd84c 132 default:
mark2r2 0:08a4d61cd84c 133 return 0x80 + (row * 0x40) + column;
mark2r2 0:08a4d61cd84c 134 }
mark2r2 0:08a4d61cd84c 135 }
mark2r2 0:08a4d61cd84c 136
mark2r2 0:08a4d61cd84c 137 int TextLCD::columns() {
mark2r2 0:08a4d61cd84c 138 switch (_type) {
mark2r2 0:08a4d61cd84c 139 case LCD20x4:
mark2r2 0:08a4d61cd84c 140 case LCD20x2:
mark2r2 0:08a4d61cd84c 141 return 20;
mark2r2 0:08a4d61cd84c 142 case LCD16x2:
mark2r2 0:08a4d61cd84c 143 case LCD16x2B:
mark2r2 0:08a4d61cd84c 144 default:
mark2r2 0:08a4d61cd84c 145 return 16;
mark2r2 0:08a4d61cd84c 146 }
mark2r2 0:08a4d61cd84c 147 }
mark2r2 0:08a4d61cd84c 148
mark2r2 0:08a4d61cd84c 149 int TextLCD::rows() {
mark2r2 0:08a4d61cd84c 150 switch (_type) {
mark2r2 0:08a4d61cd84c 151 case LCD20x4:
mark2r2 0:08a4d61cd84c 152 return 4;
mark2r2 0:08a4d61cd84c 153 case LCD16x2:
mark2r2 0:08a4d61cd84c 154 case LCD16x2B:
mark2r2 0:08a4d61cd84c 155 case LCD20x2:
mark2r2 0:08a4d61cd84c 156 default:
mark2r2 0:08a4d61cd84c 157 return 2;
mark2r2 0:08a4d61cd84c 158 }
mark2r2 0:08a4d61cd84c 159 }