Change config file suit LCD used
Fork of TextLCD by
TextLCD.cpp@8:03116f75b66e, 2013-01-29 (annotated)
- Committer:
- wim
- Date:
- Tue Jan 29 20:49:33 2013 +0000
- Revision:
- 8:03116f75b66e
- Parent:
- 7:44f34c09bd37
- Child:
- 9:0893d986e717
TextLCD Update to fix memoryaddress problems
Who changed what in which revision?
User | Revision | Line number | New 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 |
wim | 8:03116f75b66e | 3 | * 2013, WH, Updated LCD types and fixed lcd address issues |
simon | 1:ac48b187213c | 4 | * |
simon | 1:ac48b187213c | 5 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
simon | 1:ac48b187213c | 6 | * of this software and associated documentation files (the "Software"), to deal |
simon | 1:ac48b187213c | 7 | * in the Software without restriction, including without limitation the rights |
simon | 1:ac48b187213c | 8 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
simon | 1:ac48b187213c | 9 | * copies of the Software, and to permit persons to whom the Software is |
simon | 1:ac48b187213c | 10 | * furnished to do so, subject to the following conditions: |
simon | 1:ac48b187213c | 11 | * |
simon | 1:ac48b187213c | 12 | * The above copyright notice and this permission notice shall be included in |
simon | 1:ac48b187213c | 13 | * all copies or substantial portions of the Software. |
simon | 1:ac48b187213c | 14 | * |
simon | 1:ac48b187213c | 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
simon | 1:ac48b187213c | 16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
simon | 1:ac48b187213c | 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
simon | 1:ac48b187213c | 18 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
simon | 1:ac48b187213c | 19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
simon | 1:ac48b187213c | 20 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
simon | 1:ac48b187213c | 21 | * THE SOFTWARE. |
simon | 1:ac48b187213c | 22 | */ |
simon | 1:ac48b187213c | 23 | |
simon | 1:ac48b187213c | 24 | #include "TextLCD.h" |
simon | 1:ac48b187213c | 25 | #include "mbed.h" |
simon | 1:ac48b187213c | 26 | |
simon | 7:44f34c09bd37 | 27 | TextLCD::TextLCD(PinName rs, PinName e, PinName d4, PinName d5, |
simon | 7:44f34c09bd37 | 28 | PinName d6, PinName d7, LCDType type) : _rs(rs), |
simon | 7:44f34c09bd37 | 29 | _e(e), _d(d4, d5, d6, d7), |
simon | 1:ac48b187213c | 30 | _type(type) { |
simon | 1:ac48b187213c | 31 | |
simon | 1:ac48b187213c | 32 | _e = 1; |
simon | 1:ac48b187213c | 33 | _rs = 0; // command mode |
simon | 1:ac48b187213c | 34 | |
simon | 1:ac48b187213c | 35 | wait(0.015); // Wait 15ms to ensure powered up |
simon | 1:ac48b187213c | 36 | |
simon | 1:ac48b187213c | 37 | // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus) |
simon | 1:ac48b187213c | 38 | for (int i=0; i<3; i++) { |
simon | 1:ac48b187213c | 39 | writeByte(0x3); |
simon | 1:ac48b187213c | 40 | wait(0.00164); // this command takes 1.64ms, so wait for it |
simon | 1:ac48b187213c | 41 | } |
simon | 1:ac48b187213c | 42 | writeByte(0x2); // 4-bit mode |
simon | 1:ac48b187213c | 43 | wait(0.000040f); // most instructions take 40us |
simon | 1:ac48b187213c | 44 | |
simon | 1:ac48b187213c | 45 | writeCommand(0x28); // Function set 001 BW N F - - |
simon | 1:ac48b187213c | 46 | writeCommand(0x0C); |
wim | 8:03116f75b66e | 47 | writeCommand(0x06); // Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes |
simon | 1:ac48b187213c | 48 | cls(); |
simon | 1:ac48b187213c | 49 | } |
simon | 1:ac48b187213c | 50 | |
wim | 8:03116f75b66e | 51 | |
simon | 1:ac48b187213c | 52 | void TextLCD::character(int column, int row, int c) { |
wim | 8:03116f75b66e | 53 | int addr = getAddress(column, row); |
wim | 8:03116f75b66e | 54 | |
wim | 8:03116f75b66e | 55 | writeCommand(0x80 | addr); |
simon | 1:ac48b187213c | 56 | writeData(c); |
simon | 1:ac48b187213c | 57 | } |
simon | 1:ac48b187213c | 58 | |
wim | 8:03116f75b66e | 59 | |
simon | 1:ac48b187213c | 60 | void TextLCD::cls() { |
simon | 1:ac48b187213c | 61 | writeCommand(0x01); // cls, and set cursor to 0 |
simon | 1:ac48b187213c | 62 | wait(0.00164f); // This command takes 1.64 ms |
simon | 1:ac48b187213c | 63 | locate(0, 0); |
simon | 1:ac48b187213c | 64 | } |
simon | 1:ac48b187213c | 65 | |
simon | 1:ac48b187213c | 66 | void TextLCD::locate(int column, int row) { |
simon | 1:ac48b187213c | 67 | _column = column; |
simon | 1:ac48b187213c | 68 | _row = row; |
simon | 1:ac48b187213c | 69 | } |
simon | 1:ac48b187213c | 70 | |
simon | 1:ac48b187213c | 71 | int TextLCD::_putc(int value) { |
simon | 1:ac48b187213c | 72 | if (value == '\n') { |
simon | 1:ac48b187213c | 73 | _column = 0; |
simon | 1:ac48b187213c | 74 | _row++; |
simon | 1:ac48b187213c | 75 | if (_row >= rows()) { |
simon | 1:ac48b187213c | 76 | _row = 0; |
simon | 1:ac48b187213c | 77 | } |
simon | 1:ac48b187213c | 78 | } else { |
simon | 1:ac48b187213c | 79 | character(_column, _row, value); |
simon | 1:ac48b187213c | 80 | _column++; |
simon | 1:ac48b187213c | 81 | if (_column >= columns()) { |
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 | } |
simon | 1:ac48b187213c | 88 | } |
simon | 1:ac48b187213c | 89 | return value; |
simon | 1:ac48b187213c | 90 | } |
simon | 1:ac48b187213c | 91 | |
simon | 1:ac48b187213c | 92 | int TextLCD::_getc() { |
simon | 1:ac48b187213c | 93 | return -1; |
simon | 1:ac48b187213c | 94 | } |
simon | 1:ac48b187213c | 95 | |
simon | 1:ac48b187213c | 96 | void TextLCD::writeByte(int value) { |
simon | 1:ac48b187213c | 97 | _d = value >> 4; |
simon | 1:ac48b187213c | 98 | wait(0.000040f); // most instructions take 40us |
simon | 1:ac48b187213c | 99 | _e = 0; |
simon | 1:ac48b187213c | 100 | wait(0.000040f); |
simon | 1:ac48b187213c | 101 | _e = 1; |
simon | 1:ac48b187213c | 102 | _d = value >> 0; |
simon | 1:ac48b187213c | 103 | wait(0.000040f); |
simon | 1:ac48b187213c | 104 | _e = 0; |
simon | 1:ac48b187213c | 105 | wait(0.000040f); // most instructions take 40us |
simon | 1:ac48b187213c | 106 | _e = 1; |
simon | 1:ac48b187213c | 107 | } |
simon | 1:ac48b187213c | 108 | |
simon | 1:ac48b187213c | 109 | void TextLCD::writeCommand(int command) { |
simon | 1:ac48b187213c | 110 | _rs = 0; |
simon | 1:ac48b187213c | 111 | writeByte(command); |
simon | 1:ac48b187213c | 112 | } |
simon | 1:ac48b187213c | 113 | |
simon | 1:ac48b187213c | 114 | void TextLCD::writeData(int data) { |
simon | 1:ac48b187213c | 115 | _rs = 1; |
simon | 1:ac48b187213c | 116 | writeByte(data); |
simon | 1:ac48b187213c | 117 | } |
simon | 1:ac48b187213c | 118 | |
wim | 8:03116f75b66e | 119 | |
wim | 8:03116f75b66e | 120 | #if (0) |
wim | 8:03116f75b66e | 121 | // This is the original method. |
wim | 8:03116f75b66e | 122 | // It is confusing since it returns the memoryaddress or-ed with the set memorycommand 0x80. |
wim | 8:03116f75b66e | 123 | // Left it in here for compatibility with older code. New applications should use getAddress() instead. |
wim | 8:03116f75b66e | 124 | // |
simon | 1:ac48b187213c | 125 | int TextLCD::address(int column, int row) { |
simon | 1:ac48b187213c | 126 | switch (_type) { |
simon | 1:ac48b187213c | 127 | case LCD20x4: |
simon | 1:ac48b187213c | 128 | switch (row) { |
simon | 1:ac48b187213c | 129 | case 0: |
simon | 1:ac48b187213c | 130 | return 0x80 + column; |
simon | 1:ac48b187213c | 131 | case 1: |
simon | 1:ac48b187213c | 132 | return 0xc0 + column; |
simon | 1:ac48b187213c | 133 | case 2: |
simon | 1:ac48b187213c | 134 | return 0x94 + column; |
simon | 1:ac48b187213c | 135 | case 3: |
simon | 1:ac48b187213c | 136 | return 0xd4 + column; |
simon | 1:ac48b187213c | 137 | } |
simon | 1:ac48b187213c | 138 | case LCD16x2B: |
simon | 4:bf5b706f8d32 | 139 | return 0x80 + (row * 40) + column; |
simon | 1:ac48b187213c | 140 | case LCD16x2: |
simon | 1:ac48b187213c | 141 | case LCD20x2: |
simon | 1:ac48b187213c | 142 | default: |
simon | 4:bf5b706f8d32 | 143 | return 0x80 + (row * 0x40) + column; |
simon | 1:ac48b187213c | 144 | } |
simon | 1:ac48b187213c | 145 | } |
wim | 8:03116f75b66e | 146 | #endif |
wim | 8:03116f75b66e | 147 | |
wim | 8:03116f75b66e | 148 | |
wim | 8:03116f75b66e | 149 | // This replaces the original method. |
wim | 8:03116f75b66e | 150 | // Left it in here for compatibility with older code. New applications should use getAddress() instead. |
wim | 8:03116f75b66e | 151 | int TextLCD::address(int column, int row) { |
wim | 8:03116f75b66e | 152 | return 0x80 | getAddress(column, row); |
wim | 8:03116f75b66e | 153 | } |
wim | 8:03116f75b66e | 154 | |
wim | 8:03116f75b66e | 155 | // This is new method to return the memory address based on row, column and displaytype. |
wim | 8:03116f75b66e | 156 | // |
wim | 8:03116f75b66e | 157 | int TextLCD::getAddress(int column, int row) { |
wim | 8:03116f75b66e | 158 | |
wim | 8:03116f75b66e | 159 | switch (_type) { |
wim | 8:03116f75b66e | 160 | case LCD8x1: |
wim | 8:03116f75b66e | 161 | return 0x00 + column; |
wim | 8:03116f75b66e | 162 | |
wim | 8:03116f75b66e | 163 | case LCD16x4: |
wim | 8:03116f75b66e | 164 | switch (row) { |
wim | 8:03116f75b66e | 165 | case 0: |
wim | 8:03116f75b66e | 166 | return 0x00 + column; |
wim | 8:03116f75b66e | 167 | case 1: |
wim | 8:03116f75b66e | 168 | return 0x40 + column; |
wim | 8:03116f75b66e | 169 | case 2: |
wim | 8:03116f75b66e | 170 | return 0x10 + column; |
wim | 8:03116f75b66e | 171 | case 3: |
wim | 8:03116f75b66e | 172 | return 0x50 + column; |
wim | 8:03116f75b66e | 173 | } |
wim | 8:03116f75b66e | 174 | |
wim | 8:03116f75b66e | 175 | case LCD20x4: |
wim | 8:03116f75b66e | 176 | switch (row) { |
wim | 8:03116f75b66e | 177 | case 0: |
wim | 8:03116f75b66e | 178 | return 0x00 + column; |
wim | 8:03116f75b66e | 179 | case 1: |
wim | 8:03116f75b66e | 180 | return 0x40 + column; |
wim | 8:03116f75b66e | 181 | case 2: |
wim | 8:03116f75b66e | 182 | return 0x14 + column; |
wim | 8:03116f75b66e | 183 | case 3: |
wim | 8:03116f75b66e | 184 | return 0x54 + column; |
wim | 8:03116f75b66e | 185 | } |
wim | 8:03116f75b66e | 186 | |
wim | 8:03116f75b66e | 187 | // Not sure about this one, seems wrong. |
wim | 8:03116f75b66e | 188 | case LCD16x2B: |
wim | 8:03116f75b66e | 189 | return 0x00 + (row * 40) + column; |
wim | 8:03116f75b66e | 190 | |
wim | 8:03116f75b66e | 191 | case LCD8x2: |
wim | 8:03116f75b66e | 192 | case LCD16x2: |
wim | 8:03116f75b66e | 193 | case LCD20x2: |
wim | 8:03116f75b66e | 194 | case LCD24x2: |
wim | 8:03116f75b66e | 195 | return 0x00 + (row * 0x40) + column; |
wim | 8:03116f75b66e | 196 | |
wim | 8:03116f75b66e | 197 | // Should never get here. |
wim | 8:03116f75b66e | 198 | default: |
wim | 8:03116f75b66e | 199 | return 0x00; |
wim | 8:03116f75b66e | 200 | } |
wim | 8:03116f75b66e | 201 | } |
wim | 8:03116f75b66e | 202 | |
wim | 8:03116f75b66e | 203 | |
wim | 8:03116f75b66e | 204 | // Added for consistency. Set row, colum and update memoryaddress. |
wim | 8:03116f75b66e | 205 | // |
wim | 8:03116f75b66e | 206 | void TextLCD::setAddress(int column, int row) { |
wim | 8:03116f75b66e | 207 | |
wim | 8:03116f75b66e | 208 | locate(column, row); |
wim | 8:03116f75b66e | 209 | |
wim | 8:03116f75b66e | 210 | int addr = getAddress(column, row); |
wim | 8:03116f75b66e | 211 | |
wim | 8:03116f75b66e | 212 | writeCommand(0x80 | addr); |
wim | 8:03116f75b66e | 213 | } |
simon | 1:ac48b187213c | 214 | |
simon | 1:ac48b187213c | 215 | int TextLCD::columns() { |
simon | 1:ac48b187213c | 216 | switch (_type) { |
wim | 8:03116f75b66e | 217 | case LCD8x1: |
wim | 8:03116f75b66e | 218 | case LCD8x2: |
wim | 8:03116f75b66e | 219 | return 8; |
wim | 8:03116f75b66e | 220 | |
simon | 1:ac48b187213c | 221 | case LCD16x2: |
simon | 1:ac48b187213c | 222 | case LCD16x2B: |
wim | 8:03116f75b66e | 223 | case LCD16x4: |
wim | 8:03116f75b66e | 224 | return 16; |
wim | 8:03116f75b66e | 225 | |
wim | 8:03116f75b66e | 226 | case LCD20x2: |
wim | 8:03116f75b66e | 227 | case LCD20x4: |
wim | 8:03116f75b66e | 228 | return 20; |
wim | 8:03116f75b66e | 229 | |
wim | 8:03116f75b66e | 230 | case LCD24x2: |
wim | 8:03116f75b66e | 231 | return 24; |
wim | 8:03116f75b66e | 232 | |
wim | 8:03116f75b66e | 233 | // Should never get here. |
simon | 1:ac48b187213c | 234 | default: |
wim | 8:03116f75b66e | 235 | return 0; |
simon | 1:ac48b187213c | 236 | } |
simon | 1:ac48b187213c | 237 | } |
simon | 1:ac48b187213c | 238 | |
simon | 1:ac48b187213c | 239 | int TextLCD::rows() { |
simon | 1:ac48b187213c | 240 | switch (_type) { |
wim | 8:03116f75b66e | 241 | case LCD8x1: |
wim | 8:03116f75b66e | 242 | return 1; |
wim | 8:03116f75b66e | 243 | |
wim | 8:03116f75b66e | 244 | case LCD8x2: |
simon | 1:ac48b187213c | 245 | case LCD16x2: |
simon | 1:ac48b187213c | 246 | case LCD16x2B: |
simon | 1:ac48b187213c | 247 | case LCD20x2: |
wim | 8:03116f75b66e | 248 | case LCD24x2: |
wim | 8:03116f75b66e | 249 | return 2; |
wim | 8:03116f75b66e | 250 | |
wim | 8:03116f75b66e | 251 | case LCD16x4: |
wim | 8:03116f75b66e | 252 | case LCD20x4: |
wim | 8:03116f75b66e | 253 | return 4; |
wim | 8:03116f75b66e | 254 | |
simon | 1:ac48b187213c | 255 | default: |
wim | 8:03116f75b66e | 256 | return 0; |
simon | 1:ac48b187213c | 257 | } |
simon | 1:ac48b187213c | 258 | } |