Jérôme DELAIRE / DOGM162E-A

Thanks to simon For his LCD Driver program

Fork of TextLCD by Simon Ford

TextLCD.cpp@9:b9fb4716e8f6, 2015-03-17 (annotated)

Committer:
delairejerome
Date:
Tue Mar 17 09:58:01 2015 +0000
Revision:
9:b9fb4716e8f6
Parent:
6:e4cb7ddee0d3 
Drivers for DOGM162E-A LCD display. Thanks to Simon Ford for his HD44780 LCD display driver.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
simon 1:ac48b187213c 1 /* mbed TextLCD Library, for a 4-bit LCD based on HD44780
simon 6:e4cb7ddee0d3 2 * Copyright (c) 2007-2010, sford, http://mbed.org
simon 1:ac48b187213c 3 *
simon 1:ac48b187213c 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
simon 1:ac48b187213c 5 * of this software and associated documentation files (the "Software"), to deal
simon 1:ac48b187213c 6 * in the Software without restriction, including without limitation the rights
simon 1:ac48b187213c 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
simon 1:ac48b187213c 8 * copies of the Software, and to permit persons to whom the Software is
simon 1:ac48b187213c 9 * furnished to do so, subject to the following conditions:
simon 1:ac48b187213c 10 *
simon 1:ac48b187213c 11 * The above copyright notice and this permission notice shall be included in
simon 1:ac48b187213c 12 * all copies or substantial portions of the Software.
simon 1:ac48b187213c 13 *
simon 1:ac48b187213c 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
simon 1:ac48b187213c 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
simon 1:ac48b187213c 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
simon 1:ac48b187213c 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
simon 1:ac48b187213c 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
simon 1:ac48b187213c 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
simon 1:ac48b187213c 20 * THE SOFTWARE.
simon 1:ac48b187213c 21 */
simon 1:ac48b187213c 22
simon 1:ac48b187213c 23 #include "TextLCD.h"
simon 1:ac48b187213c 24 #include "mbed.h"
simon 1:ac48b187213c 25
simon 1:ac48b187213c 26 TextLCD::TextLCD(PinName rs, PinName e, PinName d0, PinName d1,
simon 1:ac48b187213c 27 PinName d2, PinName d3, LCDType type) : _rs(rs),
simon 1:ac48b187213c 28 _e(e), _d(d0, d1, d2, d3),
simon 1:ac48b187213c 29 _type(type) {
simon 1:ac48b187213c 30
delairejerome 9:b9fb4716e8f6 31 _e = 0;
simon 1:ac48b187213c 32 _rs = 0; // command mode
delairejerome 9:b9fb4716e8f6 33
delairejerome 9:b9fb4716e8f6 34 wait(0.050); // Wait 15ms to ensure powered up
simon 1:ac48b187213c 35
simon 1:ac48b187213c 36 // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus)
delairejerome 9:b9fb4716e8f6 37 for (int i=0; i<3; i++) {
delairejerome 9:b9fb4716e8f6 38 writeByte(0x30);
delairejerome 9:b9fb4716e8f6 39 wait(0.002); // this command takes 1.64ms, so wait for it
simon 1:ac48b187213c 40 }
delairejerome 9:b9fb4716e8f6 41 writeByte(0x2);
delairejerome 9:b9fb4716e8f6 42 wait(0.002);
delairejerome 9:b9fb4716e8f6 43 writeCommand(0x29);
delairejerome 9:b9fb4716e8f6 44 wait(0.001f);
delairejerome 9:b9fb4716e8f6 45 writeCommand(0x14);
delairejerome 9:b9fb4716e8f6 46 wait(0.001f);
delairejerome 9:b9fb4716e8f6 47 writeCommand(0x55);
delairejerome 9:b9fb4716e8f6 48 wait(0.001f);
delairejerome 9:b9fb4716e8f6 49 writeCommand(0x6D);
delairejerome 9:b9fb4716e8f6 50 wait(0.001f);
delairejerome 9:b9fb4716e8f6 51 writeCommand(0x78);
delairejerome 9:b9fb4716e8f6 52 wait(0.001f);
delairejerome 9:b9fb4716e8f6 53 writeCommand(0x28);
delairejerome 9:b9fb4716e8f6 54 wait(0.001f);
simon 1:ac48b187213c 55 writeCommand(0x0C);
delairejerome 9:b9fb4716e8f6 56 wait(0.001f);
delairejerome 9:b9fb4716e8f6 57 writeCommand(0x01);
delairejerome 9:b9fb4716e8f6 58 wait_ms(2);
delairejerome 9:b9fb4716e8f6 59 writeCommand(0x06);
delairejerome 9:b9fb4716e8f6 60 wait(0.001f);
simon 1:ac48b187213c 61 }
simon 1:ac48b187213c 62
simon 1:ac48b187213c 63 void TextLCD::character(int column, int row, int c) {
simon 1:ac48b187213c 64 int a = address(column, row);
simon 1:ac48b187213c 65 writeCommand(a);
simon 1:ac48b187213c 66 writeData(c);
simon 1:ac48b187213c 67 }
simon 1:ac48b187213c 68
simon 1:ac48b187213c 69 void TextLCD::cls() {
simon 1:ac48b187213c 70 writeCommand(0x01); // cls, and set cursor to 0
simon 1:ac48b187213c 71 wait(0.00164f); // This command takes 1.64 ms
simon 1:ac48b187213c 72 locate(0, 0);
simon 1:ac48b187213c 73 }
simon 1:ac48b187213c 74
simon 1:ac48b187213c 75 void TextLCD::locate(int column, int row) {
simon 1:ac48b187213c 76 _column = column;
simon 1:ac48b187213c 77 _row = row;
simon 1:ac48b187213c 78 }
simon 1:ac48b187213c 79
simon 1:ac48b187213c 80 int TextLCD::_putc(int value) {
simon 1:ac48b187213c 81 if (value == '\n') {
simon 1:ac48b187213c 82 _column = 0;
simon 1:ac48b187213c 83 _row++;
simon 1:ac48b187213c 84 if (_row >= rows()) {
simon 1:ac48b187213c 85 _row = 0;
simon 1:ac48b187213c 86 }
simon 1:ac48b187213c 87 } else {
simon 1:ac48b187213c 88 character(_column, _row, value);
simon 1:ac48b187213c 89 _column++;
simon 1:ac48b187213c 90 if (_column >= columns()) {
simon 1:ac48b187213c 91 _column = 0;
simon 1:ac48b187213c 92 _row++;
simon 1:ac48b187213c 93 if (_row >= rows()) {
simon 1:ac48b187213c 94 _row = 0;
simon 1:ac48b187213c 95 }
simon 1:ac48b187213c 96 }
simon 1:ac48b187213c 97 }
simon 1:ac48b187213c 98 return value;
simon 1:ac48b187213c 99 }
simon 1:ac48b187213c 100
simon 1:ac48b187213c 101 int TextLCD::_getc() {
simon 1:ac48b187213c 102 return -1;
simon 1:ac48b187213c 103 }
simon 1:ac48b187213c 104
simon 1:ac48b187213c 105 void TextLCD::writeByte(int value) {
simon 1:ac48b187213c 106 _d = value >> 4;
simon 1:ac48b187213c 107 wait(0.000040f); // most instructions take 40us
simon 1:ac48b187213c 108 _e = 0;
simon 1:ac48b187213c 109 wait(0.000040f);
simon 1:ac48b187213c 110 _e = 1;
simon 1:ac48b187213c 111 _d = value >> 0;
simon 1:ac48b187213c 112 wait(0.000040f);
simon 1:ac48b187213c 113 _e = 0;
simon 1:ac48b187213c 114 wait(0.000040f); // most instructions take 40us
simon 1:ac48b187213c 115 _e = 1;
simon 1:ac48b187213c 116 }
simon 1:ac48b187213c 117
simon 1:ac48b187213c 118 void TextLCD::writeCommand(int command) {
simon 1:ac48b187213c 119 _rs = 0;
simon 1:ac48b187213c 120 writeByte(command);
simon 1:ac48b187213c 121 }
simon 1:ac48b187213c 122
simon 1:ac48b187213c 123 void TextLCD::writeData(int data) {
simon 1:ac48b187213c 124 _rs = 1;
simon 1:ac48b187213c 125 writeByte(data);
simon 1:ac48b187213c 126 }
simon 1:ac48b187213c 127
simon 1:ac48b187213c 128 int TextLCD::address(int column, int row) {
simon 1:ac48b187213c 129 switch (_type) {
simon 1:ac48b187213c 130 case LCD20x4:
simon 1:ac48b187213c 131 switch (row) {
simon 1:ac48b187213c 132 case 0:
simon 1:ac48b187213c 133 return 0x80 + column;
simon 1:ac48b187213c 134 case 1:
simon 1:ac48b187213c 135 return 0xc0 + column;
simon 1:ac48b187213c 136 case 2:
simon 1:ac48b187213c 137 return 0x94 + column;
simon 1:ac48b187213c 138 case 3:
simon 1:ac48b187213c 139 return 0xd4 + column;
simon 1:ac48b187213c 140 }
simon 1:ac48b187213c 141 case LCD16x2B:
simon 4:bf5b706f8d32 142 return 0x80 + (row * 40) + column;
simon 1:ac48b187213c 143 case LCD16x2:
simon 1:ac48b187213c 144 case LCD20x2:
simon 1:ac48b187213c 145 default:
simon 4:bf5b706f8d32 146 return 0x80 + (row * 0x40) + column;
simon 1:ac48b187213c 147 }
simon 1:ac48b187213c 148 }
simon 1:ac48b187213c 149
simon 1:ac48b187213c 150 int TextLCD::columns() {
simon 1:ac48b187213c 151 switch (_type) {
simon 1:ac48b187213c 152 case LCD20x4:
simon 1:ac48b187213c 153 case LCD20x2:
simon 1:ac48b187213c 154 return 20;
simon 1:ac48b187213c 155 case LCD16x2:
simon 1:ac48b187213c 156 case LCD16x2B:
simon 1:ac48b187213c 157 default:
simon 1:ac48b187213c 158 return 16;
simon 1:ac48b187213c 159 }
simon 1:ac48b187213c 160 }
simon 1:ac48b187213c 161
simon 1:ac48b187213c 162 int TextLCD::rows() {
simon 1:ac48b187213c 163 switch (_type) {
simon 1:ac48b187213c 164 case LCD20x4:
simon 1:ac48b187213c 165 return 4;
simon 1:ac48b187213c 166 case LCD16x2:
simon 1:ac48b187213c 167 case LCD16x2B:
simon 1:ac48b187213c 168 case LCD20x2:
simon 1:ac48b187213c 169 default:
simon 1:ac48b187213c 170 return 2;
simon 1:ac48b187213c 171 }
simon 1:ac48b187213c 172 }