Dependents: FBRDash1 FBRDash-tom FBRDash
TextLCD.cpp@0:006bcd28cc39, 2012-03-21 (annotated)
- Committer:
- intrinseca
- Date:
- Wed Mar 21 23:55:03 2012 +0000
- Revision:
- 0:006bcd28cc39
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
intrinseca | 0:006bcd28cc39 | 1 | /* mbed TextLCD Library, for a 4-bit LCD based on HD44780 |
intrinseca | 0:006bcd28cc39 | 2 | * Copyright (c) 2007-2010, sford, http://mbed.org |
intrinseca | 0:006bcd28cc39 | 3 | * |
intrinseca | 0:006bcd28cc39 | 4 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
intrinseca | 0:006bcd28cc39 | 5 | * of this software and associated documentation files (the "Software"), to deal |
intrinseca | 0:006bcd28cc39 | 6 | * in the Software without restriction, including without limitation the rights |
intrinseca | 0:006bcd28cc39 | 7 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
intrinseca | 0:006bcd28cc39 | 8 | * copies of the Software, and to permit persons to whom the Software is |
intrinseca | 0:006bcd28cc39 | 9 | * furnished to do so, subject to the following conditions: |
intrinseca | 0:006bcd28cc39 | 10 | * |
intrinseca | 0:006bcd28cc39 | 11 | * The above copyright notice and this permission notice shall be included in |
intrinseca | 0:006bcd28cc39 | 12 | * all copies or substantial portions of the Software. |
intrinseca | 0:006bcd28cc39 | 13 | * |
intrinseca | 0:006bcd28cc39 | 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
intrinseca | 0:006bcd28cc39 | 15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
intrinseca | 0:006bcd28cc39 | 16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
intrinseca | 0:006bcd28cc39 | 17 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
intrinseca | 0:006bcd28cc39 | 18 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
intrinseca | 0:006bcd28cc39 | 19 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
intrinseca | 0:006bcd28cc39 | 20 | * THE SOFTWARE. |
intrinseca | 0:006bcd28cc39 | 21 | */ |
intrinseca | 0:006bcd28cc39 | 22 | |
intrinseca | 0:006bcd28cc39 | 23 | #include "TextLCD.h" |
intrinseca | 0:006bcd28cc39 | 24 | #include "mbed.h" |
intrinseca | 0:006bcd28cc39 | 25 | |
intrinseca | 0:006bcd28cc39 | 26 | TextLCD::TextLCD(PinName rs, PinName rw, PinName e, PinName d0, PinName d1, |
intrinseca | 0:006bcd28cc39 | 27 | PinName d2, PinName d3, LCDType type) : _rs(rs), _rw(rw), |
intrinseca | 0:006bcd28cc39 | 28 | _e(e), _d(d0, d1, d2, d3), _type(type) { |
intrinseca | 0:006bcd28cc39 | 29 | _rs = 0; // command mode |
intrinseca | 0:006bcd28cc39 | 30 | _rw = 0; |
intrinseca | 0:006bcd28cc39 | 31 | _e = 0; |
intrinseca | 0:006bcd28cc39 | 32 | _d.output(); // data out |
intrinseca | 0:006bcd28cc39 | 33 | |
intrinseca | 0:006bcd28cc39 | 34 | wait(0.05); // Wait 50ms to ensure powered up |
intrinseca | 0:006bcd28cc39 | 35 | |
intrinseca | 0:006bcd28cc39 | 36 | // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus) |
intrinseca | 0:006bcd28cc39 | 37 | for (int i=0; i<3; i++) { |
intrinseca | 0:006bcd28cc39 | 38 | _e = 1; |
intrinseca | 0:006bcd28cc39 | 39 | __nop(); |
intrinseca | 0:006bcd28cc39 | 40 | _d = 0x3; |
intrinseca | 0:006bcd28cc39 | 41 | __nop(); |
intrinseca | 0:006bcd28cc39 | 42 | _e = 0; |
intrinseca | 0:006bcd28cc39 | 43 | wait(0.004f); // 4ms |
intrinseca | 0:006bcd28cc39 | 44 | } |
intrinseca | 0:006bcd28cc39 | 45 | _e = 1; |
intrinseca | 0:006bcd28cc39 | 46 | __nop(); |
intrinseca | 0:006bcd28cc39 | 47 | _d = 0x2; // 4 Bit mode |
intrinseca | 0:006bcd28cc39 | 48 | __nop(); |
intrinseca | 0:006bcd28cc39 | 49 | _e = 0; |
intrinseca | 0:006bcd28cc39 | 50 | |
intrinseca | 0:006bcd28cc39 | 51 | writeCommand(0x28); // Function set 4 Bit, 2Line, 5*7 |
intrinseca | 0:006bcd28cc39 | 52 | writeCommand(0x08); // Display off |
intrinseca | 0:006bcd28cc39 | 53 | writeCommand(0x01); // clear Display |
intrinseca | 0:006bcd28cc39 | 54 | writeCommand(0x04); // cursor right, Display is not shifted |
intrinseca | 0:006bcd28cc39 | 55 | writeCommand(0x0C); // Display on , Cursor off |
intrinseca | 0:006bcd28cc39 | 56 | } |
intrinseca | 0:006bcd28cc39 | 57 | |
intrinseca | 0:006bcd28cc39 | 58 | void TextLCD::character(int column, int row, int c) { |
intrinseca | 0:006bcd28cc39 | 59 | int a = address(column, row); |
intrinseca | 0:006bcd28cc39 | 60 | writeCommand(a); |
intrinseca | 0:006bcd28cc39 | 61 | writeData(c); |
intrinseca | 0:006bcd28cc39 | 62 | } |
intrinseca | 0:006bcd28cc39 | 63 | |
intrinseca | 0:006bcd28cc39 | 64 | void TextLCD::cls() { |
intrinseca | 0:006bcd28cc39 | 65 | writeCommand(0x01); // cls, and set cursor to 0 |
intrinseca | 0:006bcd28cc39 | 66 | locate(0, 0); |
intrinseca | 0:006bcd28cc39 | 67 | } |
intrinseca | 0:006bcd28cc39 | 68 | |
intrinseca | 0:006bcd28cc39 | 69 | void TextLCD::locate(int column, int row) { |
intrinseca | 0:006bcd28cc39 | 70 | _column = column; |
intrinseca | 0:006bcd28cc39 | 71 | _row = row; |
intrinseca | 0:006bcd28cc39 | 72 | } |
intrinseca | 0:006bcd28cc39 | 73 | |
intrinseca | 0:006bcd28cc39 | 74 | |
intrinseca | 0:006bcd28cc39 | 75 | |
intrinseca | 0:006bcd28cc39 | 76 | int TextLCD::_putc(int value) { |
intrinseca | 0:006bcd28cc39 | 77 | if (value == '\n') { |
intrinseca | 0:006bcd28cc39 | 78 | _column = 0; |
intrinseca | 0:006bcd28cc39 | 79 | _row++; |
intrinseca | 0:006bcd28cc39 | 80 | if (_row >= rows()) { |
intrinseca | 0:006bcd28cc39 | 81 | _row = 0; |
intrinseca | 0:006bcd28cc39 | 82 | } |
intrinseca | 0:006bcd28cc39 | 83 | } else { |
intrinseca | 0:006bcd28cc39 | 84 | character(_column, _row, value); |
intrinseca | 0:006bcd28cc39 | 85 | _column++; |
intrinseca | 0:006bcd28cc39 | 86 | if (_column >= columns()) { |
intrinseca | 0:006bcd28cc39 | 87 | _column = 0; |
intrinseca | 0:006bcd28cc39 | 88 | _row++; |
intrinseca | 0:006bcd28cc39 | 89 | if (_row >= rows()) { |
intrinseca | 0:006bcd28cc39 | 90 | _row = 0; |
intrinseca | 0:006bcd28cc39 | 91 | } |
intrinseca | 0:006bcd28cc39 | 92 | } |
intrinseca | 0:006bcd28cc39 | 93 | } |
intrinseca | 0:006bcd28cc39 | 94 | return value; |
intrinseca | 0:006bcd28cc39 | 95 | } |
intrinseca | 0:006bcd28cc39 | 96 | |
intrinseca | 0:006bcd28cc39 | 97 | int TextLCD::_getc() { |
intrinseca | 0:006bcd28cc39 | 98 | int a = address(_column, _row); |
intrinseca | 0:006bcd28cc39 | 99 | writeCommand(a); |
intrinseca | 0:006bcd28cc39 | 100 | return (readData()); |
intrinseca | 0:006bcd28cc39 | 101 | } |
intrinseca | 0:006bcd28cc39 | 102 | |
intrinseca | 0:006bcd28cc39 | 103 | void TextLCD::writeByte(int value) { |
intrinseca | 0:006bcd28cc39 | 104 | _e = 1; |
intrinseca | 0:006bcd28cc39 | 105 | __nop(); |
intrinseca | 0:006bcd28cc39 | 106 | _d = value >> 4; |
intrinseca | 0:006bcd28cc39 | 107 | __nop(); |
intrinseca | 0:006bcd28cc39 | 108 | _e = 0; |
intrinseca | 0:006bcd28cc39 | 109 | __nop(); |
intrinseca | 0:006bcd28cc39 | 110 | _e = 1; |
intrinseca | 0:006bcd28cc39 | 111 | __nop(); |
intrinseca | 0:006bcd28cc39 | 112 | _d = value >> 0; |
intrinseca | 0:006bcd28cc39 | 113 | __nop(); |
intrinseca | 0:006bcd28cc39 | 114 | _e = 0; |
intrinseca | 0:006bcd28cc39 | 115 | } |
intrinseca | 0:006bcd28cc39 | 116 | |
intrinseca | 0:006bcd28cc39 | 117 | void TextLCD::writeCommand(int command) { |
intrinseca | 0:006bcd28cc39 | 118 | waitBusy(); // check if display is ready |
intrinseca | 0:006bcd28cc39 | 119 | _rs = 0; |
intrinseca | 0:006bcd28cc39 | 120 | writeByte(command); |
intrinseca | 0:006bcd28cc39 | 121 | } |
intrinseca | 0:006bcd28cc39 | 122 | |
intrinseca | 0:006bcd28cc39 | 123 | int TextLCD::readData(){ |
intrinseca | 0:006bcd28cc39 | 124 | int input; |
intrinseca | 0:006bcd28cc39 | 125 | waitBusy(); |
intrinseca | 0:006bcd28cc39 | 126 | _rw = 1; |
intrinseca | 0:006bcd28cc39 | 127 | _rs = 1; |
intrinseca | 0:006bcd28cc39 | 128 | __nop(); |
intrinseca | 0:006bcd28cc39 | 129 | _d.input(); // switch Data port to input |
intrinseca | 0:006bcd28cc39 | 130 | _e = 1; |
intrinseca | 0:006bcd28cc39 | 131 | __nop(); |
intrinseca | 0:006bcd28cc39 | 132 | input = _d.read() << 4; // high nibble |
intrinseca | 0:006bcd28cc39 | 133 | _e = 0; |
intrinseca | 0:006bcd28cc39 | 134 | __nop(); |
intrinseca | 0:006bcd28cc39 | 135 | _e = 1; |
intrinseca | 0:006bcd28cc39 | 136 | __nop(); |
intrinseca | 0:006bcd28cc39 | 137 | input = input | _d.read(); // low nibble |
intrinseca | 0:006bcd28cc39 | 138 | _e = 0; |
intrinseca | 0:006bcd28cc39 | 139 | return (input); |
intrinseca | 0:006bcd28cc39 | 140 | } |
intrinseca | 0:006bcd28cc39 | 141 | |
intrinseca | 0:006bcd28cc39 | 142 | void TextLCD::waitBusy(){ |
intrinseca | 0:006bcd28cc39 | 143 | int input; |
intrinseca | 0:006bcd28cc39 | 144 | _rw = 1; |
intrinseca | 0:006bcd28cc39 | 145 | _rs = 0; |
intrinseca | 0:006bcd28cc39 | 146 | __nop(); |
intrinseca | 0:006bcd28cc39 | 147 | _d.input(); // switch Data port to input |
intrinseca | 0:006bcd28cc39 | 148 | do{ |
intrinseca | 0:006bcd28cc39 | 149 | _e = 1; |
intrinseca | 0:006bcd28cc39 | 150 | __nop(); |
intrinseca | 0:006bcd28cc39 | 151 | input = _d.read(); |
intrinseca | 0:006bcd28cc39 | 152 | _e = 0; |
intrinseca | 0:006bcd28cc39 | 153 | __nop(); |
intrinseca | 0:006bcd28cc39 | 154 | _e = 1; |
intrinseca | 0:006bcd28cc39 | 155 | __nop(); |
intrinseca | 0:006bcd28cc39 | 156 | _e = 0; |
intrinseca | 0:006bcd28cc39 | 157 | }while((0x8 & input) == 0x8); // wait until display is ready |
intrinseca | 0:006bcd28cc39 | 158 | _rw = 0; |
intrinseca | 0:006bcd28cc39 | 159 | _d.output(); // switch port back to output |
intrinseca | 0:006bcd28cc39 | 160 | } |
intrinseca | 0:006bcd28cc39 | 161 | |
intrinseca | 0:006bcd28cc39 | 162 | void TextLCD::writeData(int data) { |
intrinseca | 0:006bcd28cc39 | 163 | waitBusy(); |
intrinseca | 0:006bcd28cc39 | 164 | _rs = 1; |
intrinseca | 0:006bcd28cc39 | 165 | writeByte(data); |
intrinseca | 0:006bcd28cc39 | 166 | } |
intrinseca | 0:006bcd28cc39 | 167 | |
intrinseca | 0:006bcd28cc39 | 168 | |
intrinseca | 0:006bcd28cc39 | 169 | // set user defined char |
intrinseca | 0:006bcd28cc39 | 170 | void TextLCD::writeCGRAM(int address, int pattern[8]){ |
intrinseca | 0:006bcd28cc39 | 171 | int i; |
intrinseca | 0:006bcd28cc39 | 172 | address = address & 0x07; //max 8 char |
intrinseca | 0:006bcd28cc39 | 173 | for(i=0;i<8;i++){ |
intrinseca | 0:006bcd28cc39 | 174 | waitBusy(); // check if display is ready |
intrinseca | 0:006bcd28cc39 | 175 | _rs = 0; |
intrinseca | 0:006bcd28cc39 | 176 | writeByte(0x40 + address * 8 + i); |
intrinseca | 0:006bcd28cc39 | 177 | writeData(pattern[i]); |
intrinseca | 0:006bcd28cc39 | 178 | } |
intrinseca | 0:006bcd28cc39 | 179 | } |
intrinseca | 0:006bcd28cc39 | 180 | |
intrinseca | 0:006bcd28cc39 | 181 | |
intrinseca | 0:006bcd28cc39 | 182 | int TextLCD::address(int column, int row) { |
intrinseca | 0:006bcd28cc39 | 183 | switch (_type) { |
intrinseca | 0:006bcd28cc39 | 184 | case LCD20x4: |
intrinseca | 0:006bcd28cc39 | 185 | switch (row) { |
intrinseca | 0:006bcd28cc39 | 186 | case 0: |
intrinseca | 0:006bcd28cc39 | 187 | return 0x80 + column; |
intrinseca | 0:006bcd28cc39 | 188 | case 1: |
intrinseca | 0:006bcd28cc39 | 189 | return 0xc0 + column; |
intrinseca | 0:006bcd28cc39 | 190 | case 2: |
intrinseca | 0:006bcd28cc39 | 191 | return 0x94 + column; |
intrinseca | 0:006bcd28cc39 | 192 | case 3: |
intrinseca | 0:006bcd28cc39 | 193 | return 0xd4 + column; |
intrinseca | 0:006bcd28cc39 | 194 | } |
intrinseca | 0:006bcd28cc39 | 195 | case LCD16x2B: |
intrinseca | 0:006bcd28cc39 | 196 | return 0x80 + (row * 40) + column; |
intrinseca | 0:006bcd28cc39 | 197 | case LCD16x2: |
intrinseca | 0:006bcd28cc39 | 198 | case LCD20x2: |
intrinseca | 0:006bcd28cc39 | 199 | default: |
intrinseca | 0:006bcd28cc39 | 200 | return 0x80 + (row * 0x40) + column; |
intrinseca | 0:006bcd28cc39 | 201 | } |
intrinseca | 0:006bcd28cc39 | 202 | } |
intrinseca | 0:006bcd28cc39 | 203 | |
intrinseca | 0:006bcd28cc39 | 204 | int TextLCD::columns() { |
intrinseca | 0:006bcd28cc39 | 205 | switch (_type) { |
intrinseca | 0:006bcd28cc39 | 206 | case LCD20x4: |
intrinseca | 0:006bcd28cc39 | 207 | case LCD20x2: |
intrinseca | 0:006bcd28cc39 | 208 | return 20; |
intrinseca | 0:006bcd28cc39 | 209 | case LCD16x2: |
intrinseca | 0:006bcd28cc39 | 210 | case LCD16x2B: |
intrinseca | 0:006bcd28cc39 | 211 | default: |
intrinseca | 0:006bcd28cc39 | 212 | return 16; |
intrinseca | 0:006bcd28cc39 | 213 | } |
intrinseca | 0:006bcd28cc39 | 214 | } |
intrinseca | 0:006bcd28cc39 | 215 | |
intrinseca | 0:006bcd28cc39 | 216 | int TextLCD::rows() { |
intrinseca | 0:006bcd28cc39 | 217 | switch (_type) { |
intrinseca | 0:006bcd28cc39 | 218 | case LCD20x4: |
intrinseca | 0:006bcd28cc39 | 219 | return 4; |
intrinseca | 0:006bcd28cc39 | 220 | case LCD16x2: |
intrinseca | 0:006bcd28cc39 | 221 | case LCD16x2B: |
intrinseca | 0:006bcd28cc39 | 222 | case LCD20x2: |
intrinseca | 0:006bcd28cc39 | 223 | default: |
intrinseca | 0:006bcd28cc39 | 224 | return 2; |
intrinseca | 0:006bcd28cc39 | 225 | } |
intrinseca | 0:006bcd28cc39 | 226 | } |