Hyeonjong Lee / TextLCD_CGRAM

CGRAM code in TextLCD

TextLCD.cpp@0:40112ed34e69, 2014-04-24 (annotated)

Committer:
leejong87
Date:
Thu Apr 24 03:53:46 2014 +0000
Revision:
0:40112ed34e69
CGRAM code in TextLCD

Who changed what in which revision?

UserRevisionLine numberNew contents of line
leejong87 0:40112ed34e69 1 /* mbed TextLCD Library, for a 4-bit LCD based on HD44780
leejong87 0:40112ed34e69 2 * Copyright (c) 2007-2010, sford, http://mbed.org
leejong87 0:40112ed34e69 3 *
leejong87 0:40112ed34e69 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
leejong87 0:40112ed34e69 5 * of this software and associated documentation files (the "Software"), to deal
leejong87 0:40112ed34e69 6 * in the Software without restriction, including without limitation the rights
leejong87 0:40112ed34e69 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
leejong87 0:40112ed34e69 8 * copies of the Software, and to permit persons to whom the Software is
leejong87 0:40112ed34e69 9 * furnished to do so, subject to the following conditions:
leejong87 0:40112ed34e69 10 *
leejong87 0:40112ed34e69 11 * The above copyright notice and this permission notice shall be included in
leejong87 0:40112ed34e69 12 * all copies or substantial portions of the Software.
leejong87 0:40112ed34e69 13 *
leejong87 0:40112ed34e69 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
leejong87 0:40112ed34e69 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
leejong87 0:40112ed34e69 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
leejong87 0:40112ed34e69 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
leejong87 0:40112ed34e69 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
leejong87 0:40112ed34e69 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
leejong87 0:40112ed34e69 20 * THE SOFTWARE.
leejong87 0:40112ed34e69 21 */
leejong87 0:40112ed34e69 22
leejong87 0:40112ed34e69 23 #include "TextLCD.h"
leejong87 0:40112ed34e69 24 #include "mbed.h"
leejong87 0:40112ed34e69 25
leejong87 0:40112ed34e69 26 TextLCD::TextLCD(PinName rs, PinName e, PinName d4, PinName d5,
leejong87 0:40112ed34e69 27 PinName d6, PinName d7, LCDType type) : _rs(rs),
leejong87 0:40112ed34e69 28 _e(e), _d(d4, d5, d6, d7),
leejong87 0:40112ed34e69 29 _type(type) {
leejong87 0:40112ed34e69 30
leejong87 0:40112ed34e69 31 _e = 1;
leejong87 0:40112ed34e69 32 _rs = 0; // command mode
leejong87 0:40112ed34e69 33
leejong87 0:40112ed34e69 34 wait(0.015); // Wait 15ms to ensure powered up
leejong87 0:40112ed34e69 35
leejong87 0:40112ed34e69 36 // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus)
leejong87 0:40112ed34e69 37 for (int i=0; i<3; i++) {
leejong87 0:40112ed34e69 38 writeByte(0x3);
leejong87 0:40112ed34e69 39 wait(0.00164); // this command takes 1.64ms, so wait for it
leejong87 0:40112ed34e69 40 }
leejong87 0:40112ed34e69 41 writeByte(0x2); // 4-bit mode
leejong87 0:40112ed34e69 42 wait(0.000040f); // most instructions take 40us
leejong87 0:40112ed34e69 43
leejong87 0:40112ed34e69 44 writeCommand(0x28); // Function set 001 BW N F - -
leejong87 0:40112ed34e69 45 writeCommand(0x0C);
leejong87 0:40112ed34e69 46 writeCommand(0x6); // Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes
leejong87 0:40112ed34e69 47 cls();
leejong87 0:40112ed34e69 48 }
leejong87 0:40112ed34e69 49
leejong87 0:40112ed34e69 50 void TextLCD::character(int column, int row, int c) {
leejong87 0:40112ed34e69 51 int a = address(column, row);
leejong87 0:40112ed34e69 52 writeCommand(a);
leejong87 0:40112ed34e69 53 writeData(c);
leejong87 0:40112ed34e69 54 }
leejong87 0:40112ed34e69 55
leejong87 0:40112ed34e69 56 void TextLCD::cls() {
leejong87 0:40112ed34e69 57 writeCommand(0x01); // cls, and set cursor to 0
leejong87 0:40112ed34e69 58 wait(0.00164f); // This command takes 1.64 ms
leejong87 0:40112ed34e69 59 locate(0, 0);
leejong87 0:40112ed34e69 60 }
leejong87 0:40112ed34e69 61
leejong87 0:40112ed34e69 62 void TextLCD::locate(int column, int row) {
leejong87 0:40112ed34e69 63 _column = column;
leejong87 0:40112ed34e69 64 _row = row;
leejong87 0:40112ed34e69 65 }
leejong87 0:40112ed34e69 66
leejong87 0:40112ed34e69 67 int TextLCD::_putc(int value) {
leejong87 0:40112ed34e69 68 if (value == '\n') {
leejong87 0:40112ed34e69 69 _column = 0;
leejong87 0:40112ed34e69 70 _row++;
leejong87 0:40112ed34e69 71 if (_row >= rows()) {
leejong87 0:40112ed34e69 72 _row = 0;
leejong87 0:40112ed34e69 73 }
leejong87 0:40112ed34e69 74 } else {
leejong87 0:40112ed34e69 75 character(_column, _row, value);
leejong87 0:40112ed34e69 76 _column++;
leejong87 0:40112ed34e69 77 if (_column >= columns()) {
leejong87 0:40112ed34e69 78 _column = 0;
leejong87 0:40112ed34e69 79 _row++;
leejong87 0:40112ed34e69 80 if (_row >= rows()) {
leejong87 0:40112ed34e69 81 _row = 0;
leejong87 0:40112ed34e69 82 }
leejong87 0:40112ed34e69 83 }
leejong87 0:40112ed34e69 84 }
leejong87 0:40112ed34e69 85 return value;
leejong87 0:40112ed34e69 86 }
leejong87 0:40112ed34e69 87
leejong87 0:40112ed34e69 88 int TextLCD::_getc() {
leejong87 0:40112ed34e69 89 return -1;
leejong87 0:40112ed34e69 90 }
leejong87 0:40112ed34e69 91
leejong87 0:40112ed34e69 92 void TextLCD::writeByte(int value) {
leejong87 0:40112ed34e69 93 _d = value >> 4;
leejong87 0:40112ed34e69 94 wait(0.000040f); // most instructions take 40us
leejong87 0:40112ed34e69 95 _e = 0;
leejong87 0:40112ed34e69 96 wait(0.000040f);
leejong87 0:40112ed34e69 97 _e = 1;
leejong87 0:40112ed34e69 98 _d = value >> 0;
leejong87 0:40112ed34e69 99 wait(0.000040f);
leejong87 0:40112ed34e69 100 _e = 0;
leejong87 0:40112ed34e69 101 wait(0.000040f); // most instructions take 40us
leejong87 0:40112ed34e69 102 _e = 1;
leejong87 0:40112ed34e69 103 }
leejong87 0:40112ed34e69 104
leejong87 0:40112ed34e69 105 void TextLCD::writeCommand(int command) {
leejong87 0:40112ed34e69 106 _rs = 0;
leejong87 0:40112ed34e69 107 writeByte(command);
leejong87 0:40112ed34e69 108 }
leejong87 0:40112ed34e69 109
leejong87 0:40112ed34e69 110 void TextLCD::writeData(int data) {
leejong87 0:40112ed34e69 111 _rs = 1;
leejong87 0:40112ed34e69 112 writeByte(data);
leejong87 0:40112ed34e69 113 }
leejong87 0:40112ed34e69 114
leejong87 0:40112ed34e69 115 int TextLCD::address(int column, int row) {
leejong87 0:40112ed34e69 116 switch (_type) {
leejong87 0:40112ed34e69 117 case LCD20x4:
leejong87 0:40112ed34e69 118 switch (row) {
leejong87 0:40112ed34e69 119 case 0:
leejong87 0:40112ed34e69 120 return 0x80 + column;
leejong87 0:40112ed34e69 121 case 1:
leejong87 0:40112ed34e69 122 return 0xc0 + column;
leejong87 0:40112ed34e69 123 case 2:
leejong87 0:40112ed34e69 124 return 0x94 + column;
leejong87 0:40112ed34e69 125 case 3:
leejong87 0:40112ed34e69 126 return 0xd4 + column;
leejong87 0:40112ed34e69 127 }
leejong87 0:40112ed34e69 128 case LCD16x2B:
leejong87 0:40112ed34e69 129 return 0x80 + (row * 40) + column;
leejong87 0:40112ed34e69 130 case LCD16x2:
leejong87 0:40112ed34e69 131 case LCD20x2:
leejong87 0:40112ed34e69 132 default:
leejong87 0:40112ed34e69 133 return 0x80 + (row * 0x40) + column;
leejong87 0:40112ed34e69 134 }
leejong87 0:40112ed34e69 135 }
leejong87 0:40112ed34e69 136
leejong87 0:40112ed34e69 137 int TextLCD::columns() {
leejong87 0:40112ed34e69 138 switch (_type) {
leejong87 0:40112ed34e69 139 case LCD20x4:
leejong87 0:40112ed34e69 140 case LCD20x2:
leejong87 0:40112ed34e69 141 return 20;
leejong87 0:40112ed34e69 142 case LCD16x2:
leejong87 0:40112ed34e69 143 case LCD16x2B:
leejong87 0:40112ed34e69 144 default:
leejong87 0:40112ed34e69 145 return 16;
leejong87 0:40112ed34e69 146 }
leejong87 0:40112ed34e69 147 }
leejong87 0:40112ed34e69 148
leejong87 0:40112ed34e69 149 int TextLCD::rows() {
leejong87 0:40112ed34e69 150 switch (_type) {
leejong87 0:40112ed34e69 151 case LCD20x4:
leejong87 0:40112ed34e69 152 return 4;
leejong87 0:40112ed34e69 153 case LCD16x2:
leejong87 0:40112ed34e69 154 case LCD16x2B:
leejong87 0:40112ed34e69 155 case LCD20x2:
leejong87 0:40112ed34e69 156 default:
leejong87 0:40112ed34e69 157 return 2;
leejong87 0:40112ed34e69 158 }
leejong87 0:40112ed34e69 159 }
leejong87 0:40112ed34e69 160
leejong87 0:40112ed34e69 161 void TextLCD::WriteCGRAM(int cgramloc, char *data){
leejong87 0:40112ed34e69 162 writeCommand(0x40+((cgramloc&0x07)<<3)); //Set CG-RAM address
leejong87 0:40112ed34e69 163 _rs = 0;
leejong87 0:40112ed34e69 164 for (int i=0; i<8; i++) {
leejong87 0:40112ed34e69 165 writeData(*data++);
leejong87 0:40112ed34e69 166 }
leejong87 0:40112ed34e69 167 _rs = 1;
leejong87 0:40112ed34e69 168 }