Trung Nguyen
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FINAL_PROJECT_4180
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Fork of FINAL_PROJECT_4180 by
cryst_lcd.cpp@14:ca57ad53761b, 2016-11-23 (annotated)
- Committer:
- xemnas214
- Date:
- Wed Nov 23 01:07:10 2016 +0000
- Revision:
- 14:ca57ad53761b
- Parent:
- 12:5cb9ffad1ad7
iotlockkkk;
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
nyengele | 12:5cb9ffad1ad7 | 1 | /** |
nyengele | 12:5cb9ffad1ad7 | 2 | * Driver for LCD devices based on the HD44780 controller |
nyengele | 12:5cb9ffad1ad7 | 3 | */ |
nyengele | 12:5cb9ffad1ad7 | 4 | |
nyengele | 12:5cb9ffad1ad7 | 5 | /* Description |
nyengele | 12:5cb9ffad1ad7 | 6 | |
nyengele | 12:5cb9ffad1ad7 | 7 | LCD SIZES SUPPORTED: |
nyengele | 12:5cb9ffad1ad7 | 8 | 1-line displays: 8x1, 16x1, 20x1, 24x1, 32x1, 40x1 |
nyengele | 12:5cb9ffad1ad7 | 9 | 2-line displays: 16x2, 20x2, 24x2, 32x2, 40x2 |
nyengele | 12:5cb9ffad1ad7 | 10 | 4-line displays: 16x4, 20x4, 40x4 |
nyengele | 12:5cb9ffad1ad7 | 11 | |
nyengele | 12:5cb9ffad1ad7 | 12 | SUPPORTED PLATFORM: mbed |
nyengele | 12:5cb9ffad1ad7 | 13 | */ |
nyengele | 12:5cb9ffad1ad7 | 14 | |
nyengele | 12:5cb9ffad1ad7 | 15 | |
nyengele | 12:5cb9ffad1ad7 | 16 | #include "cryst_lcd.h" |
nyengele | 12:5cb9ffad1ad7 | 17 | |
nyengele | 12:5cb9ffad1ad7 | 18 | Cryst_LCD::Cryst_LCD(PinName rs, PinName en, PinName db4, PinName db5, |
nyengele | 12:5cb9ffad1ad7 | 19 | PinName db6, PinName db7, LCDSize size) |
nyengele | 12:5cb9ffad1ad7 | 20 | : _rs(rs), _en(en), _data(db4, db5, db6, db7) |
nyengele | 12:5cb9ffad1ad7 | 21 | { |
nyengele | 12:5cb9ffad1ad7 | 22 | _size = size; |
nyengele | 12:5cb9ffad1ad7 | 23 | _row = 0; |
nyengele | 12:5cb9ffad1ad7 | 24 | _col = 0; |
nyengele | 12:5cb9ffad1ad7 | 25 | _displayStatus = 0x0C; |
nyengele | 12:5cb9ffad1ad7 | 26 | init(); |
nyengele | 12:5cb9ffad1ad7 | 27 | } |
nyengele | 12:5cb9ffad1ad7 | 28 | |
nyengele | 12:5cb9ffad1ad7 | 29 | |
nyengele | 12:5cb9ffad1ad7 | 30 | void Cryst_LCD::cls() |
nyengele | 12:5cb9ffad1ad7 | 31 | { |
nyengele | 12:5cb9ffad1ad7 | 32 | writeCommand(0x01, false); |
nyengele | 12:5cb9ffad1ad7 | 33 | wait_ms(2); |
nyengele | 12:5cb9ffad1ad7 | 34 | locate(0, 0); |
nyengele | 12:5cb9ffad1ad7 | 35 | } |
nyengele | 12:5cb9ffad1ad7 | 36 | |
nyengele | 12:5cb9ffad1ad7 | 37 | void Cryst_LCD::locate(int row, int col) |
nyengele | 12:5cb9ffad1ad7 | 38 | { |
nyengele | 12:5cb9ffad1ad7 | 39 | _row = 0; |
nyengele | 12:5cb9ffad1ad7 | 40 | _col = col; |
nyengele | 12:5cb9ffad1ad7 | 41 | |
nyengele | 12:5cb9ffad1ad7 | 42 | if (row < getMaxRows()) { |
nyengele | 12:5cb9ffad1ad7 | 43 | _row = row; |
nyengele | 12:5cb9ffad1ad7 | 44 | } |
nyengele | 12:5cb9ffad1ad7 | 45 | |
nyengele | 12:5cb9ffad1ad7 | 46 | if (_col >= getMaxCols()) { |
nyengele | 12:5cb9ffad1ad7 | 47 | _col = 0; |
nyengele | 12:5cb9ffad1ad7 | 48 | if (_row < getMaxRows() - 1) |
nyengele | 12:5cb9ffad1ad7 | 49 | _row++; |
nyengele | 12:5cb9ffad1ad7 | 50 | else _row = 0; |
nyengele | 12:5cb9ffad1ad7 | 51 | } |
nyengele | 12:5cb9ffad1ad7 | 52 | |
nyengele | 12:5cb9ffad1ad7 | 53 | int addr = getAddress(_row, _col); |
nyengele | 12:5cb9ffad1ad7 | 54 | addr |= 0x80; |
nyengele | 12:5cb9ffad1ad7 | 55 | writeCommand(addr); |
nyengele | 12:5cb9ffad1ad7 | 56 | } |
nyengele | 12:5cb9ffad1ad7 | 57 | |
nyengele | 12:5cb9ffad1ad7 | 58 | void Cryst_LCD::display_off() { |
nyengele | 12:5cb9ffad1ad7 | 59 | _displayStatus &= 0x0B; |
nyengele | 12:5cb9ffad1ad7 | 60 | writeCommand(_displayStatus); |
nyengele | 12:5cb9ffad1ad7 | 61 | } |
nyengele | 12:5cb9ffad1ad7 | 62 | |
nyengele | 12:5cb9ffad1ad7 | 63 | void Cryst_LCD::display_on() { |
nyengele | 12:5cb9ffad1ad7 | 64 | _displayStatus |= 0x04; |
nyengele | 12:5cb9ffad1ad7 | 65 | writeCommand(_displayStatus); |
nyengele | 12:5cb9ffad1ad7 | 66 | } |
nyengele | 12:5cb9ffad1ad7 | 67 | |
nyengele | 12:5cb9ffad1ad7 | 68 | void Cryst_LCD::cursor_on() { |
nyengele | 12:5cb9ffad1ad7 | 69 | _displayStatus |= 0x02; |
nyengele | 12:5cb9ffad1ad7 | 70 | writeCommand(_displayStatus); |
nyengele | 12:5cb9ffad1ad7 | 71 | } |
nyengele | 12:5cb9ffad1ad7 | 72 | |
nyengele | 12:5cb9ffad1ad7 | 73 | void Cryst_LCD::cursor_off() { |
nyengele | 12:5cb9ffad1ad7 | 74 | _displayStatus &= 0x0D; |
nyengele | 12:5cb9ffad1ad7 | 75 | writeCommand(_displayStatus); |
nyengele | 12:5cb9ffad1ad7 | 76 | } |
nyengele | 12:5cb9ffad1ad7 | 77 | |
nyengele | 12:5cb9ffad1ad7 | 78 | void Cryst_LCD::cursor_blink() { |
nyengele | 12:5cb9ffad1ad7 | 79 | _displayStatus |= 0x01; |
nyengele | 12:5cb9ffad1ad7 | 80 | writeCommand(_displayStatus); |
nyengele | 12:5cb9ffad1ad7 | 81 | } |
nyengele | 12:5cb9ffad1ad7 | 82 | |
nyengele | 12:5cb9ffad1ad7 | 83 | void Cryst_LCD::cursor_no_blink() { |
nyengele | 12:5cb9ffad1ad7 | 84 | _displayStatus &= 0x0E; |
nyengele | 12:5cb9ffad1ad7 | 85 | writeCommand(_displayStatus); |
nyengele | 12:5cb9ffad1ad7 | 86 | } |
nyengele | 12:5cb9ffad1ad7 | 87 | |
nyengele | 12:5cb9ffad1ad7 | 88 | void Cryst_LCD::clear_line() { |
nyengele | 12:5cb9ffad1ad7 | 89 | int lineWidth = getMaxCols(); |
nyengele | 12:5cb9ffad1ad7 | 90 | |
nyengele | 12:5cb9ffad1ad7 | 91 | for (int i = 0; i < lineWidth - 1; i++) { |
nyengele | 12:5cb9ffad1ad7 | 92 | locate(_row, i); |
nyengele | 12:5cb9ffad1ad7 | 93 | printf(" "); |
nyengele | 12:5cb9ffad1ad7 | 94 | } |
nyengele | 12:5cb9ffad1ad7 | 95 | |
nyengele | 12:5cb9ffad1ad7 | 96 | locate(_row, 0); |
nyengele | 12:5cb9ffad1ad7 | 97 | } |
nyengele | 12:5cb9ffad1ad7 | 98 | |
nyengele | 12:5cb9ffad1ad7 | 99 | void Cryst_LCD::reset() |
nyengele | 12:5cb9ffad1ad7 | 100 | { |
nyengele | 12:5cb9ffad1ad7 | 101 | _rs = 0; |
nyengele | 12:5cb9ffad1ad7 | 102 | wait_ms(15); // wait approximately 15 ms |
nyengele | 12:5cb9ffad1ad7 | 103 | writeNibble(0x3); // write config data |
nyengele | 12:5cb9ffad1ad7 | 104 | wait_ms(5); // wait approximately 4.1 ms |
nyengele | 12:5cb9ffad1ad7 | 105 | writeNibble(0x3); // write config data again |
nyengele | 12:5cb9ffad1ad7 | 106 | wait_us(100); // wait approximately 100 us |
nyengele | 12:5cb9ffad1ad7 | 107 | } |
nyengele | 12:5cb9ffad1ad7 | 108 | |
nyengele | 12:5cb9ffad1ad7 | 109 | void Cryst_LCD::init() |
nyengele | 12:5cb9ffad1ad7 | 110 | { |
nyengele | 12:5cb9ffad1ad7 | 111 | reset(); |
nyengele | 12:5cb9ffad1ad7 | 112 | |
nyengele | 12:5cb9ffad1ad7 | 113 | // Function set |
nyengele | 12:5cb9ffad1ad7 | 114 | if (getMaxRows() <= 1) { // 1-line display |
nyengele | 12:5cb9ffad1ad7 | 115 | // (DF = 0, N = 0, F = 0) |
nyengele | 12:5cb9ffad1ad7 | 116 | // 4-bit mode, 1-line display, 5x8 font size |
nyengele | 12:5cb9ffad1ad7 | 117 | writeCommand(0x20); |
nyengele | 12:5cb9ffad1ad7 | 118 | } else { // Multi-line display |
nyengele | 12:5cb9ffad1ad7 | 119 | // (DF = 0, N = 1, F = 0) |
nyengele | 12:5cb9ffad1ad7 | 120 | // 4-bit mode, 2-line display, 5x8 font size |
nyengele | 12:5cb9ffad1ad7 | 121 | writeCommand(0x28); |
nyengele | 12:5cb9ffad1ad7 | 122 | } |
nyengele | 12:5cb9ffad1ad7 | 123 | |
nyengele | 12:5cb9ffad1ad7 | 124 | // Entry Mode |
nyengele | 12:5cb9ffad1ad7 | 125 | // (I/D = 1, S = 0) |
nyengele | 12:5cb9ffad1ad7 | 126 | // DDRAM autoincrement, No display shifts |
nyengele | 12:5cb9ffad1ad7 | 127 | writeCommand(0x06); |
nyengele | 12:5cb9ffad1ad7 | 128 | |
nyengele | 12:5cb9ffad1ad7 | 129 | // Display Control |
nyengele | 12:5cb9ffad1ad7 | 130 | // (D = 1, C = 0, B = 0) |
nyengele | 12:5cb9ffad1ad7 | 131 | // Display ON, cursor OFF, No cursor blinking |
nyengele | 12:5cb9ffad1ad7 | 132 | writeCommand(_displayStatus); |
nyengele | 12:5cb9ffad1ad7 | 133 | |
nyengele | 12:5cb9ffad1ad7 | 134 | // Clear Display |
nyengele | 12:5cb9ffad1ad7 | 135 | cls(); |
nyengele | 12:5cb9ffad1ad7 | 136 | } |
nyengele | 12:5cb9ffad1ad7 | 137 | |
nyengele | 12:5cb9ffad1ad7 | 138 | int Cryst_LCD::getAddress(int row, int col) |
nyengele | 12:5cb9ffad1ad7 | 139 | { |
nyengele | 12:5cb9ffad1ad7 | 140 | int rowStartAddr[4] = {0x00, 0x40, 0x14, 0x54}; |
nyengele | 12:5cb9ffad1ad7 | 141 | int tempRow = 0, tempCol = 0; |
nyengele | 12:5cb9ffad1ad7 | 142 | if (row < getMaxRows()) tempRow = row; |
nyengele | 12:5cb9ffad1ad7 | 143 | if (col < getMaxCols()) tempCol = col; |
nyengele | 12:5cb9ffad1ad7 | 144 | return rowStartAddr[tempRow] + tempCol; |
nyengele | 12:5cb9ffad1ad7 | 145 | } |
nyengele | 12:5cb9ffad1ad7 | 146 | |
nyengele | 12:5cb9ffad1ad7 | 147 | // Default wait time is 40 us |
nyengele | 12:5cb9ffad1ad7 | 148 | void Cryst_LCD::writeData(int ch, bool use_default_timing) |
nyengele | 12:5cb9ffad1ad7 | 149 | { |
nyengele | 12:5cb9ffad1ad7 | 150 | _rs = 1; |
nyengele | 12:5cb9ffad1ad7 | 151 | writeNibble((ch >> 4) & 0x0F); |
nyengele | 12:5cb9ffad1ad7 | 152 | writeNibble(ch & 0x0F); |
nyengele | 12:5cb9ffad1ad7 | 153 | |
nyengele | 12:5cb9ffad1ad7 | 154 | if (use_default_timing) |
nyengele | 12:5cb9ffad1ad7 | 155 | wait_us(40); |
nyengele | 12:5cb9ffad1ad7 | 156 | } |
nyengele | 12:5cb9ffad1ad7 | 157 | |
nyengele | 12:5cb9ffad1ad7 | 158 | // Default wait time is 40 us |
nyengele | 12:5cb9ffad1ad7 | 159 | void Cryst_LCD::writeCommand(int cmd, bool use_default_timing) |
nyengele | 12:5cb9ffad1ad7 | 160 | { |
nyengele | 12:5cb9ffad1ad7 | 161 | _rs = 0; |
nyengele | 12:5cb9ffad1ad7 | 162 | writeNibble((cmd >> 4) & 0x0F); |
nyengele | 12:5cb9ffad1ad7 | 163 | writeNibble(cmd & 0x0F); |
nyengele | 12:5cb9ffad1ad7 | 164 | |
nyengele | 12:5cb9ffad1ad7 | 165 | if (use_default_timing) |
nyengele | 12:5cb9ffad1ad7 | 166 | wait_us(40); |
nyengele | 12:5cb9ffad1ad7 | 167 | } |
nyengele | 12:5cb9ffad1ad7 | 168 | |
nyengele | 12:5cb9ffad1ad7 | 169 | void Cryst_LCD::writeNibble(int nib) |
nyengele | 12:5cb9ffad1ad7 | 170 | { |
nyengele | 12:5cb9ffad1ad7 | 171 | _data = nib & 0xF; |
nyengele | 12:5cb9ffad1ad7 | 172 | wait_us(1); |
nyengele | 12:5cb9ffad1ad7 | 173 | _en = 1; |
nyengele | 12:5cb9ffad1ad7 | 174 | wait_us(1); |
nyengele | 12:5cb9ffad1ad7 | 175 | _en = 0; |
nyengele | 12:5cb9ffad1ad7 | 176 | wait_us(1); |
nyengele | 12:5cb9ffad1ad7 | 177 | } |
nyengele | 12:5cb9ffad1ad7 | 178 | |
nyengele | 12:5cb9ffad1ad7 | 179 | void Cryst_LCD::getMaxDimensions(int* rowCount, int* colCount) { |
nyengele | 12:5cb9ffad1ad7 | 180 | switch(_size) { |
nyengele | 12:5cb9ffad1ad7 | 181 | // 1-line displays |
nyengele | 12:5cb9ffad1ad7 | 182 | case LCD8x1: *rowCount = 1; *colCount = 8; break; |
nyengele | 12:5cb9ffad1ad7 | 183 | case LCD16x1: *rowCount = 1; *colCount = 16; break; |
nyengele | 12:5cb9ffad1ad7 | 184 | case LCD20x1: *rowCount = 1; *colCount = 20; break; |
nyengele | 12:5cb9ffad1ad7 | 185 | case LCD24x1: *rowCount = 1; *colCount = 24; break; |
nyengele | 12:5cb9ffad1ad7 | 186 | case LCD32x1: *rowCount = 1; *colCount = 32; break; |
nyengele | 12:5cb9ffad1ad7 | 187 | case LCD40x1: *rowCount = 1; *colCount = 40; break; |
nyengele | 12:5cb9ffad1ad7 | 188 | |
nyengele | 12:5cb9ffad1ad7 | 189 | // 2-line displays |
nyengele | 12:5cb9ffad1ad7 | 190 | case LCD16x2: *rowCount = 2; *colCount = 16; break; |
nyengele | 12:5cb9ffad1ad7 | 191 | case LCD20x2: *rowCount = 2; *colCount = 20; break; |
nyengele | 12:5cb9ffad1ad7 | 192 | case LCD24x2: *rowCount = 2; *colCount = 24; break; |
nyengele | 12:5cb9ffad1ad7 | 193 | case LCD32x2: *rowCount = 2; *colCount = 32; break; |
nyengele | 12:5cb9ffad1ad7 | 194 | case LCD40x2: *rowCount = 2; *colCount = 40; break; |
nyengele | 12:5cb9ffad1ad7 | 195 | |
nyengele | 12:5cb9ffad1ad7 | 196 | // 4-line displays |
nyengele | 12:5cb9ffad1ad7 | 197 | case LCD16x4: *rowCount = 4; *colCount = 16; break; |
nyengele | 12:5cb9ffad1ad7 | 198 | case LCD20x4: *rowCount = 4; *colCount = 20; break; |
nyengele | 12:5cb9ffad1ad7 | 199 | case LCD40x4: *rowCount = 4; *colCount = 40; break; |
nyengele | 12:5cb9ffad1ad7 | 200 | |
nyengele | 12:5cb9ffad1ad7 | 201 | default: *rowCount = 0; *colCount = 0; break; |
nyengele | 12:5cb9ffad1ad7 | 202 | } |
nyengele | 12:5cb9ffad1ad7 | 203 | } |
nyengele | 12:5cb9ffad1ad7 | 204 | |
nyengele | 12:5cb9ffad1ad7 | 205 | int Cryst_LCD::getMaxRows() |
nyengele | 12:5cb9ffad1ad7 | 206 | { |
nyengele | 12:5cb9ffad1ad7 | 207 | int rowCount = 0; |
nyengele | 12:5cb9ffad1ad7 | 208 | int colCount = 0; |
nyengele | 12:5cb9ffad1ad7 | 209 | getMaxDimensions(&rowCount, &colCount); |
nyengele | 12:5cb9ffad1ad7 | 210 | return rowCount; |
nyengele | 12:5cb9ffad1ad7 | 211 | } |
nyengele | 12:5cb9ffad1ad7 | 212 | |
nyengele | 12:5cb9ffad1ad7 | 213 | int Cryst_LCD::getMaxCols() |
nyengele | 12:5cb9ffad1ad7 | 214 | { |
nyengele | 12:5cb9ffad1ad7 | 215 | int rowCount = 0; |
nyengele | 12:5cb9ffad1ad7 | 216 | int colCount = 0; |
nyengele | 12:5cb9ffad1ad7 | 217 | getMaxDimensions(&rowCount, &colCount); |
nyengele | 12:5cb9ffad1ad7 | 218 | return colCount; |
nyengele | 12:5cb9ffad1ad7 | 219 | } |
nyengele | 12:5cb9ffad1ad7 | 220 | |
nyengele | 12:5cb9ffad1ad7 | 221 | int Cryst_LCD::_putc(int ch) |
nyengele | 12:5cb9ffad1ad7 | 222 | { |
nyengele | 12:5cb9ffad1ad7 | 223 | if (ch == '\n') { |
nyengele | 12:5cb9ffad1ad7 | 224 | locate(_row + 1, 0); |
nyengele | 12:5cb9ffad1ad7 | 225 | } |
nyengele | 12:5cb9ffad1ad7 | 226 | |
nyengele | 12:5cb9ffad1ad7 | 227 | else if (ch == '\t') { |
nyengele | 12:5cb9ffad1ad7 | 228 | locate(_row, _col + 3); |
nyengele | 12:5cb9ffad1ad7 | 229 | } |
nyengele | 12:5cb9ffad1ad7 | 230 | |
nyengele | 12:5cb9ffad1ad7 | 231 | else if (ch == '\r') { |
nyengele | 12:5cb9ffad1ad7 | 232 | locate(_row, 0); |
nyengele | 12:5cb9ffad1ad7 | 233 | } |
nyengele | 12:5cb9ffad1ad7 | 234 | |
nyengele | 12:5cb9ffad1ad7 | 235 | else { |
nyengele | 12:5cb9ffad1ad7 | 236 | locate(_row, _col); |
nyengele | 12:5cb9ffad1ad7 | 237 | writeData(ch); |
nyengele | 12:5cb9ffad1ad7 | 238 | locate(_row, _col + 1); |
nyengele | 12:5cb9ffad1ad7 | 239 | } |
nyengele | 12:5cb9ffad1ad7 | 240 | |
nyengele | 12:5cb9ffad1ad7 | 241 | return ch; |
nyengele | 12:5cb9ffad1ad7 | 242 | } |
nyengele | 12:5cb9ffad1ad7 | 243 | |
nyengele | 12:5cb9ffad1ad7 | 244 | int Cryst_LCD::_getc() |
nyengele | 12:5cb9ffad1ad7 | 245 | { |
nyengele | 12:5cb9ffad1ad7 | 246 | return -5; |
nyengele | 12:5cb9ffad1ad7 | 247 | } |