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| 1 | +#include "LiquidCrystal.h" |
| 2 | + |
| 3 | +#include <stdio.h> |
| 4 | +#include <string.h> |
| 5 | +#include <inttypes.h> |
| 6 | +#include "Arduino.h" |
| 7 | + |
| 8 | +// When the display powers up, it is configured as follows: |
| 9 | +// |
| 10 | +// 1. Display clear |
| 11 | +// 2. Function set: |
| 12 | +// DL = 1; 8-bit interface data |
| 13 | +// N = 0; 1-line display |
| 14 | +// F = 0; 5x8 dot character font |
| 15 | +// 3. Display on/off control: |
| 16 | +// D = 0; Display off |
| 17 | +// C = 0; Cursor off |
| 18 | +// B = 0; Blinking off |
| 19 | +// 4. Entry mode set: |
| 20 | +// I/D = 1; Increment by 1 |
| 21 | +// S = 0; No shift |
| 22 | +// |
| 23 | +// Note, however, that resetting the Arduino doesn't reset the LCD, so we |
| 24 | +// can't assume that its in that state when a sketch starts (and the |
| 25 | +// LiquidCrystal constructor is called). |
| 26 | + |
| 27 | +LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable, |
| 28 | + uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3, |
| 29 | + uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7) |
| 30 | +{ |
| 31 | + init(0, rs, rw, enable, d0, d1, d2, d3, d4, d5, d6, d7); |
| 32 | +} |
| 33 | + |
| 34 | +LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t enable, |
| 35 | + uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3, |
| 36 | + uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7) |
| 37 | +{ |
| 38 | + init(0, rs, 255, enable, d0, d1, d2, d3, d4, d5, d6, d7); |
| 39 | +} |
| 40 | + |
| 41 | +LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable, |
| 42 | + uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3) |
| 43 | +{ |
| 44 | + init(1, rs, rw, enable, d0, d1, d2, d3, 0, 0, 0, 0); |
| 45 | +} |
| 46 | + |
| 47 | +LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t enable, |
| 48 | + uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3) |
| 49 | +{ |
| 50 | + init(1, rs, 255, enable, d0, d1, d2, d3, 0, 0, 0, 0); |
| 51 | +} |
| 52 | + |
| 53 | +void LiquidCrystal::init(uint8_t fourbitmode, uint8_t rs, uint8_t rw, uint8_t enable, |
| 54 | + uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3, |
| 55 | + uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7) |
| 56 | +{ |
| 57 | + _rs_pin = rs; |
| 58 | + _rw_pin = rw; |
| 59 | + _enable_pin = enable; |
| 60 | + |
| 61 | + _data_pins[0] = d0; |
| 62 | + _data_pins[1] = d1; |
| 63 | + _data_pins[2] = d2; |
| 64 | + _data_pins[3] = d3; |
| 65 | + _data_pins[4] = d4; |
| 66 | + _data_pins[5] = d5; |
| 67 | + _data_pins[6] = d6; |
| 68 | + _data_pins[7] = d7; |
| 69 | + |
| 70 | + pinMode(_rs_pin, OUTPUT); |
| 71 | + // we can save 1 pin by not using RW. Indicate by passing 255 instead of pin# |
| 72 | + if (_rw_pin != 255) { |
| 73 | + pinMode(_rw_pin, OUTPUT); |
| 74 | + } |
| 75 | + pinMode(_enable_pin, OUTPUT); |
| 76 | + |
| 77 | + if (fourbitmode) |
| 78 | + _displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS; |
| 79 | + else |
| 80 | + _displayfunction = LCD_8BITMODE | LCD_1LINE | LCD_5x8DOTS; |
| 81 | + |
| 82 | + begin(16, 1); |
| 83 | +} |
| 84 | + |
| 85 | +void LiquidCrystal::begin(uint8_t cols, uint8_t lines, uint8_t dotsize) { |
| 86 | + if (lines > 1) { |
| 87 | + _displayfunction |= LCD_2LINE; |
| 88 | + } |
| 89 | + _numlines = lines; |
| 90 | + _currline = 0; |
| 91 | + |
| 92 | + // for some 1 line displays you can select a 10 pixel high font |
| 93 | + if ((dotsize != 0) && (lines == 1)) { |
| 94 | + _displayfunction |= LCD_5x10DOTS; |
| 95 | + } |
| 96 | + |
| 97 | + // SEE PAGE 45/46 FOR INITIALIZATION SPECIFICATION! |
| 98 | + // according to datasheet, we need at least 40ms after power rises above 2.7V |
| 99 | + // before sending commands. Arduino can turn on way befer 4.5V so we'll wait 50 |
| 100 | + delayMicroseconds(50000); |
| 101 | + // Now we pull both RS and R/W low to begin commands |
| 102 | + digitalWrite(_rs_pin, LOW); |
| 103 | + digitalWrite(_enable_pin, LOW); |
| 104 | + if (_rw_pin != 255) { |
| 105 | + digitalWrite(_rw_pin, LOW); |
| 106 | + } |
| 107 | + |
| 108 | + //put the LCD into 4 bit or 8 bit mode |
| 109 | + if (! (_displayfunction & LCD_8BITMODE)) { |
| 110 | + // this is according to the hitachi HD44780 datasheet |
| 111 | + // figure 24, pg 46 |
| 112 | + |
| 113 | + // we start in 8bit mode, try to set 4 bit mode |
| 114 | + write4bits(0x03); |
| 115 | + delayMicroseconds(4500); // wait min 4.1ms |
| 116 | + |
| 117 | + // second try |
| 118 | + write4bits(0x03); |
| 119 | + delayMicroseconds(4500); // wait min 4.1ms |
| 120 | + |
| 121 | + // third go! |
| 122 | + write4bits(0x03); |
| 123 | + delayMicroseconds(150); |
| 124 | + |
| 125 | + // finally, set to 4-bit interface |
| 126 | + write4bits(0x02); |
| 127 | + } else { |
| 128 | + // this is according to the hitachi HD44780 datasheet |
| 129 | + // page 45 figure 23 |
| 130 | + |
| 131 | + // Send function set command sequence |
| 132 | + command(LCD_FUNCTIONSET | _displayfunction); |
| 133 | + delayMicroseconds(4500); // wait more than 4.1ms |
| 134 | + |
| 135 | + // second try |
| 136 | + command(LCD_FUNCTIONSET | _displayfunction); |
| 137 | + delayMicroseconds(150); |
| 138 | + |
| 139 | + // third go |
| 140 | + command(LCD_FUNCTIONSET | _displayfunction); |
| 141 | + } |
| 142 | + |
| 143 | + // finally, set # lines, font size, etc. |
| 144 | + command(LCD_FUNCTIONSET | _displayfunction); |
| 145 | + |
| 146 | + // turn the display on with no cursor or blinking default |
| 147 | + _displaycontrol = LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF; |
| 148 | + display(); |
| 149 | + |
| 150 | + // clear it off |
| 151 | + clear(); |
| 152 | + |
| 153 | + // Initialize to default text direction (for romance languages) |
| 154 | + _displaymode = LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT; |
| 155 | + // set the entry mode |
| 156 | + command(LCD_ENTRYMODESET | _displaymode); |
| 157 | + |
| 158 | +} |
| 159 | + |
| 160 | +/********** high level commands, for the user! */ |
| 161 | +void LiquidCrystal::clear() |
| 162 | +{ |
| 163 | + command(LCD_CLEARDISPLAY); // clear display, set cursor position to zero |
| 164 | + delayMicroseconds(2000); // this command takes a long time! |
| 165 | +} |
| 166 | + |
| 167 | +void LiquidCrystal::home() |
| 168 | +{ |
| 169 | + command(LCD_RETURNHOME); // set cursor position to zero |
| 170 | + delayMicroseconds(2000); // this command takes a long time! |
| 171 | +} |
| 172 | + |
| 173 | +void LiquidCrystal::setCursor(uint8_t col, uint8_t row) |
| 174 | +{ |
| 175 | + int row_offsets[] = { 0x00, 0x40, 0x14, 0x54 }; |
| 176 | + if ( row >= _numlines ) { |
| 177 | + row = _numlines-1; // we count rows starting w/0 |
| 178 | + } |
| 179 | + |
| 180 | + command(LCD_SETDDRAMADDR | (col + row_offsets[row])); |
| 181 | +} |
| 182 | + |
| 183 | +// Turn the display on/off (quickly) |
| 184 | +void LiquidCrystal::noDisplay() { |
| 185 | + _displaycontrol &= ~LCD_DISPLAYON; |
| 186 | + command(LCD_DISPLAYCONTROL | _displaycontrol); |
| 187 | +} |
| 188 | +void LiquidCrystal::display() { |
| 189 | + _displaycontrol |= LCD_DISPLAYON; |
| 190 | + command(LCD_DISPLAYCONTROL | _displaycontrol); |
| 191 | +} |
| 192 | + |
| 193 | +// Turns the underline cursor on/off |
| 194 | +void LiquidCrystal::noCursor() { |
| 195 | + _displaycontrol &= ~LCD_CURSORON; |
| 196 | + command(LCD_DISPLAYCONTROL | _displaycontrol); |
| 197 | +} |
| 198 | +void LiquidCrystal::cursor() { |
| 199 | + _displaycontrol |= LCD_CURSORON; |
| 200 | + command(LCD_DISPLAYCONTROL | _displaycontrol); |
| 201 | +} |
| 202 | + |
| 203 | +// Turn on and off the blinking cursor |
| 204 | +void LiquidCrystal::noBlink() { |
| 205 | + _displaycontrol &= ~LCD_BLINKON; |
| 206 | + command(LCD_DISPLAYCONTROL | _displaycontrol); |
| 207 | +} |
| 208 | +void LiquidCrystal::blink() { |
| 209 | + _displaycontrol |= LCD_BLINKON; |
| 210 | + command(LCD_DISPLAYCONTROL | _displaycontrol); |
| 211 | +} |
| 212 | + |
| 213 | +// These commands scroll the display without changing the RAM |
| 214 | +void LiquidCrystal::scrollDisplayLeft(void) { |
| 215 | + command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVELEFT); |
| 216 | +} |
| 217 | +void LiquidCrystal::scrollDisplayRight(void) { |
| 218 | + command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVERIGHT); |
| 219 | +} |
| 220 | + |
| 221 | +// This is for text that flows Left to Right |
| 222 | +void LiquidCrystal::leftToRight(void) { |
| 223 | + _displaymode |= LCD_ENTRYLEFT; |
| 224 | + command(LCD_ENTRYMODESET | _displaymode); |
| 225 | +} |
| 226 | + |
| 227 | +// This is for text that flows Right to Left |
| 228 | +void LiquidCrystal::rightToLeft(void) { |
| 229 | + _displaymode &= ~LCD_ENTRYLEFT; |
| 230 | + command(LCD_ENTRYMODESET | _displaymode); |
| 231 | +} |
| 232 | + |
| 233 | +// This will 'right justify' text from the cursor |
| 234 | +void LiquidCrystal::autoscroll(void) { |
| 235 | + _displaymode |= LCD_ENTRYSHIFTINCREMENT; |
| 236 | + command(LCD_ENTRYMODESET | _displaymode); |
| 237 | +} |
| 238 | + |
| 239 | +// This will 'left justify' text from the cursor |
| 240 | +void LiquidCrystal::noAutoscroll(void) { |
| 241 | + _displaymode &= ~LCD_ENTRYSHIFTINCREMENT; |
| 242 | + command(LCD_ENTRYMODESET | _displaymode); |
| 243 | +} |
| 244 | + |
| 245 | +// Allows us to fill the first 8 CGRAM locations |
| 246 | +// with custom characters |
| 247 | +void LiquidCrystal::createChar(uint8_t location, uint8_t charmap[]) { |
| 248 | + location &= 0x7; // we only have 8 locations 0-7 |
| 249 | + command(LCD_SETCGRAMADDR | (location << 3)); |
| 250 | + for (int i=0; i<8; i++) { |
| 251 | + write(charmap[i]); |
| 252 | + } |
| 253 | +} |
| 254 | + |
| 255 | +/*********** mid level commands, for sending data/cmds */ |
| 256 | + |
| 257 | +inline void LiquidCrystal::command(uint8_t value) { |
| 258 | + send(value, LOW); |
| 259 | +} |
| 260 | + |
| 261 | +inline size_t LiquidCrystal::write(uint8_t value) { |
| 262 | + send(value, HIGH); |
| 263 | + return 1; // assume sucess |
| 264 | +} |
| 265 | + |
| 266 | +/************ low level data pushing commands **********/ |
| 267 | + |
| 268 | +// write either command or data, with automatic 4/8-bit selection |
| 269 | +void LiquidCrystal::send(uint8_t value, uint8_t mode) { |
| 270 | + digitalWrite(_rs_pin, mode); |
| 271 | + |
| 272 | + // if there is a RW pin indicated, set it low to Write |
| 273 | + if (_rw_pin != 255) { |
| 274 | + digitalWrite(_rw_pin, LOW); |
| 275 | + } |
| 276 | + |
| 277 | + if (_displayfunction & LCD_8BITMODE) { |
| 278 | + write8bits(value); |
| 279 | + } else { |
| 280 | + write4bits(value>>4); |
| 281 | + write4bits(value); |
| 282 | + } |
| 283 | +} |
| 284 | + |
| 285 | +void LiquidCrystal::pulseEnable(void) { |
| 286 | + digitalWrite(_enable_pin, LOW); |
| 287 | + delayMicroseconds(1); |
| 288 | + digitalWrite(_enable_pin, HIGH); |
| 289 | + delayMicroseconds(1); // enable pulse must be >450ns |
| 290 | + digitalWrite(_enable_pin, LOW); |
| 291 | + delayMicroseconds(100); // commands need > 37us to settle |
| 292 | +} |
| 293 | + |
| 294 | +void LiquidCrystal::write4bits(uint8_t value) { |
| 295 | + for (int i = 0; i < 4; i++) { |
| 296 | + pinMode(_data_pins[i], OUTPUT); |
| 297 | + digitalWrite(_data_pins[i], (value >> i) & 0x01); |
| 298 | + } |
| 299 | + |
| 300 | + pulseEnable(); |
| 301 | +} |
| 302 | + |
| 303 | +void LiquidCrystal::write8bits(uint8_t value) { |
| 304 | + for (int i = 0; i < 8; i++) { |
| 305 | + pinMode(_data_pins[i], OUTPUT); |
| 306 | + digitalWrite(_data_pins[i], (value >> i) & 0x01); |
| 307 | + } |
| 308 | + |
| 309 | + pulseEnable(); |
| 310 | +} |
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