Patrick Amrein / TextLCDfor

TextLCD for GDM2004D based on testbed version based on TextLCD. Changed to library

Dependents:   ZVV_Netz_Ticker

TextLCD.cpp@1:b0b747a8cb5b, 2014-02-22 (annotated)

Committer:
18padx08
Date:
Sat Feb 22 22:19:31 2014 +0000
Revision:
1:b0b747a8cb5b
Parent:
0:1fedc42e71ef 
changes in putc if screen is full:;  clear screen and start writing on row 0 column 0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
18padx08 0:1fedc42e71ef 1 /* mbed TextLCD Library, for a 4-bit LCD based on HD44780
18padx08 0:1fedc42e71ef 2 * Copyright (c) 2007-2010, sford, http://mbed.org
18padx08 0:1fedc42e71ef 3 *
18padx08 0:1fedc42e71ef 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
18padx08 0:1fedc42e71ef 5 * of this software and associated documentation files (the "Software"), to deal
18padx08 0:1fedc42e71ef 6 * in the Software without restriction, including without limitation the rights
18padx08 0:1fedc42e71ef 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
18padx08 0:1fedc42e71ef 8 * copies of the Software, and to permit persons to whom the Software is
18padx08 0:1fedc42e71ef 9 * furnished to do so, subject to the following conditions:
18padx08 0:1fedc42e71ef 10 *
18padx08 0:1fedc42e71ef 11 * The above copyright notice and this permission notice shall be included in
18padx08 0:1fedc42e71ef 12 * all copies or substantial portions of the Software.
18padx08 0:1fedc42e71ef 13 *
18padx08 0:1fedc42e71ef 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18padx08 0:1fedc42e71ef 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18padx08 0:1fedc42e71ef 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18padx08 0:1fedc42e71ef 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18padx08 0:1fedc42e71ef 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
18padx08 0:1fedc42e71ef 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
18padx08 0:1fedc42e71ef 20 * THE SOFTWARE.
18padx08 0:1fedc42e71ef 21 */
18padx08 0:1fedc42e71ef 22
18padx08 0:1fedc42e71ef 23 #include "TextLCD.h"
18padx08 0:1fedc42e71ef 24 #include "mbed.h"
18padx08 0:1fedc42e71ef 25
18padx08 0:1fedc42e71ef 26 TextLCD::TextLCD(PinName rs, PinName rw, PinName e, PinName d4, PinName d5,
18padx08 0:1fedc42e71ef 27 PinName d6, PinName d7, LCDType type) : _rs(rs), _rw(rw),
18padx08 0:1fedc42e71ef 28 _e(e), _d(d4, d5, d6, d7),
18padx08 0:1fedc42e71ef 29 _type(type) {
18padx08 0:1fedc42e71ef 30
18padx08 0:1fedc42e71ef 31 _rw = 0;
18padx08 0:1fedc42e71ef 32 _e = 1;
18padx08 0:1fedc42e71ef 33 _rs = 0; // command mode
18padx08 0:1fedc42e71ef 34
18padx08 0:1fedc42e71ef 35 wait(0.015); // Wait 15ms to ensure powered up
18padx08 0:1fedc42e71ef 36
18padx08 0:1fedc42e71ef 37 // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus)
18padx08 0:1fedc42e71ef 38 for (int i=0; i<3; i++) {
18padx08 0:1fedc42e71ef 39 writeNibble(0x3);
18padx08 0:1fedc42e71ef 40 wait(0.00164); // this command takes 1.64ms, so wait for it
18padx08 0:1fedc42e71ef 41 }
18padx08 0:1fedc42e71ef 42
18padx08 0:1fedc42e71ef 43 writeNibble(0x2); // 4-bit mode
18padx08 0:1fedc42e71ef 44
18padx08 0:1fedc42e71ef 45 writeCommand(0x28); // Function set 001 BW N F - -
18padx08 0:1fedc42e71ef 46 writeCommand(0x0C);
18padx08 0:1fedc42e71ef 47 writeCommand(0x6); // Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes
18padx08 0:1fedc42e71ef 48 cls();
18padx08 0:1fedc42e71ef 49 }
18padx08 0:1fedc42e71ef 50
18padx08 0:1fedc42e71ef 51 void TextLCD::character(int column, int row, int c) {
18padx08 0:1fedc42e71ef 52 int a = address(column, row);
18padx08 0:1fedc42e71ef 53 writeCommand(a);
18padx08 0:1fedc42e71ef 54 writeData(c);
18padx08 0:1fedc42e71ef 55 }
18padx08 0:1fedc42e71ef 56
18padx08 0:1fedc42e71ef 57 void TextLCD::cls() {
18padx08 0:1fedc42e71ef 58 writeCommand(0x01); // cls, and set cursor to 0
18padx08 0:1fedc42e71ef 59 wait(0.00164f); // This command takes 1.64 ms
18padx08 0:1fedc42e71ef 60 locate(0, 0);
18padx08 0:1fedc42e71ef 61 }
18padx08 0:1fedc42e71ef 62
18padx08 0:1fedc42e71ef 63 void TextLCD::locate(int column, int row) {
18padx08 0:1fedc42e71ef 64 _column = column;
18padx08 0:1fedc42e71ef 65 _row = row;
18padx08 0:1fedc42e71ef 66 }
18padx08 0:1fedc42e71ef 67
18padx08 0:1fedc42e71ef 68 int TextLCD::_putc(int value) {
18padx08 0:1fedc42e71ef 69 if (value == '\n') {
18padx08 0:1fedc42e71ef 70 _column = 0;
18padx08 0:1fedc42e71ef 71 _row++;
18padx08 0:1fedc42e71ef 72 if (_row >= rows()) {
18padx08 0:1fedc42e71ef 73 _row = 0;
18padx08 0:1fedc42e71ef 74 }
18padx08 0:1fedc42e71ef 75 } else {
18padx08 0:1fedc42e71ef 76 character(_column, _row, value);
18padx08 0:1fedc42e71ef 77 _column++;
18padx08 0:1fedc42e71ef 78 if (_column >= columns()) {
18padx08 0:1fedc42e71ef 79 _column = 0;
18padx08 0:1fedc42e71ef 80 _row++;
18padx08 0:1fedc42e71ef 81 if (_row >= rows()) {
18padx08 0:1fedc42e71ef 82 _row = 0;
18padx08 1:b0b747a8cb5b 83 this->cls();
18padx08 0:1fedc42e71ef 84 }
18padx08 0:1fedc42e71ef 85 }
18padx08 0:1fedc42e71ef 86 }
18padx08 0:1fedc42e71ef 87 return value;
18padx08 0:1fedc42e71ef 88 }
18padx08 0:1fedc42e71ef 89
18padx08 0:1fedc42e71ef 90 int TextLCD::_getc() {
18padx08 0:1fedc42e71ef 91 return -1;
18padx08 0:1fedc42e71ef 92 }
18padx08 0:1fedc42e71ef 93
18padx08 0:1fedc42e71ef 94 void TextLCD::writeByte(int value) {
18padx08 0:1fedc42e71ef 95 writeNibble(value >> 4);
18padx08 0:1fedc42e71ef 96 writeNibble(value >> 0);
18padx08 0:1fedc42e71ef 97 }
18padx08 0:1fedc42e71ef 98
18padx08 0:1fedc42e71ef 99 void TextLCD::writeCommand(int command) {
18padx08 0:1fedc42e71ef 100 _rs = 0;
18padx08 0:1fedc42e71ef 101 writeByte(command);
18padx08 0:1fedc42e71ef 102 }
18padx08 0:1fedc42e71ef 103
18padx08 0:1fedc42e71ef 104 void TextLCD::clock(void) {
18padx08 0:1fedc42e71ef 105 wait(0.000040f);
18padx08 0:1fedc42e71ef 106 _e = 0;
18padx08 0:1fedc42e71ef 107 wait(0.000040f);
18padx08 0:1fedc42e71ef 108 _e = 1;
18padx08 0:1fedc42e71ef 109 }
18padx08 0:1fedc42e71ef 110
18padx08 0:1fedc42e71ef 111 void TextLCD::writeNibble(int data) {
18padx08 0:1fedc42e71ef 112 _d = data;
18padx08 0:1fedc42e71ef 113 clock();
18padx08 0:1fedc42e71ef 114 }
18padx08 0:1fedc42e71ef 115
18padx08 0:1fedc42e71ef 116 void TextLCD::writeData(int data) {
18padx08 0:1fedc42e71ef 117 _rs = 1;
18padx08 0:1fedc42e71ef 118 writeByte(data);
18padx08 0:1fedc42e71ef 119 }
18padx08 0:1fedc42e71ef 120
18padx08 0:1fedc42e71ef 121 int TextLCD::address(int column, int row) {
18padx08 0:1fedc42e71ef 122 switch (_type) {
18padx08 0:1fedc42e71ef 123 case LCD20x4:
18padx08 0:1fedc42e71ef 124 switch (row) {
18padx08 0:1fedc42e71ef 125 case 0:
18padx08 0:1fedc42e71ef 126 return 0x80 + column;
18padx08 0:1fedc42e71ef 127 case 1:
18padx08 0:1fedc42e71ef 128 return 0xc0 + column;
18padx08 0:1fedc42e71ef 129 case 2:
18padx08 0:1fedc42e71ef 130 return 0x94 + column;
18padx08 0:1fedc42e71ef 131 case 3:
18padx08 0:1fedc42e71ef 132 return 0xd4 + column;
18padx08 0:1fedc42e71ef 133 }
18padx08 0:1fedc42e71ef 134 case LCD16x2B:
18padx08 0:1fedc42e71ef 135 return 0x80 + (row * 40) + column;
18padx08 0:1fedc42e71ef 136 case LCD16x2:
18padx08 0:1fedc42e71ef 137 case LCD20x2:
18padx08 0:1fedc42e71ef 138 default:
18padx08 0:1fedc42e71ef 139 return 0x80 + (row * 0x40) + column;
18padx08 0:1fedc42e71ef 140 }
18padx08 0:1fedc42e71ef 141 }
18padx08 0:1fedc42e71ef 142
18padx08 0:1fedc42e71ef 143 int TextLCD::columns() {
18padx08 0:1fedc42e71ef 144 switch (_type) {
18padx08 0:1fedc42e71ef 145 case LCD20x4:
18padx08 0:1fedc42e71ef 146 case LCD20x2:
18padx08 0:1fedc42e71ef 147 return 20;
18padx08 0:1fedc42e71ef 148 case LCD16x2:
18padx08 0:1fedc42e71ef 149 case LCD16x2B:
18padx08 0:1fedc42e71ef 150 default:
18padx08 0:1fedc42e71ef 151 return 16;
18padx08 0:1fedc42e71ef 152 }
18padx08 0:1fedc42e71ef 153 }
18padx08 0:1fedc42e71ef 154
18padx08 0:1fedc42e71ef 155 int TextLCD::rows() {
18padx08 0:1fedc42e71ef 156 switch (_type) {
18padx08 0:1fedc42e71ef 157 case LCD20x4:
18padx08 0:1fedc42e71ef 158 return 4;
18padx08 0:1fedc42e71ef 159 case LCD16x2:
18padx08 0:1fedc42e71ef 160 case LCD16x2B:
18padx08 0:1fedc42e71ef 161 case LCD20x2:
18padx08 0:1fedc42e71ef 162 default:
18padx08 0:1fedc42e71ef 163 return 2;
18padx08 0:1fedc42e71ef 164 }
18padx08 0:1fedc42e71ef 165 }