diff options
Diffstat (limited to 'libraries/LiquidCrystal')
| -rwxr-xr-x | libraries/LiquidCrystal/LiquidCrystal.cpp | 297 | ||||
| -rwxr-xr-x | libraries/LiquidCrystal/LiquidCrystal.h | 95 |
2 files changed, 324 insertions, 68 deletions
diff --git a/libraries/LiquidCrystal/LiquidCrystal.cpp b/libraries/LiquidCrystal/LiquidCrystal.cpp index b5f2cd4..4e46318 100755 --- a/libraries/LiquidCrystal/LiquidCrystal.cpp +++ b/libraries/LiquidCrystal/LiquidCrystal.cpp @@ -25,10 +25,39 @@ // LiquidCrystal constructor is called). LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable, - uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3, - uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7) : - _four_bit_mode(0), _rs_pin(rs), _rw_pin(rw), _enable_pin(enable) + uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3, + uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7) { + init(0, rs, rw, enable, d0, d1, d2, d3, d4, d5, d6, d7); +} + +LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t enable, + uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3, + uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7) +{ + init(0, rs, -1, enable, d0, d1, d2, d3, d4, d5, d6, d7); +} + +LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable, + uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3) +{ + init(1, rs, rw, enable, d0, d1, d2, d3, 0, 0, 0, 0); +} + +LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t enable, + uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3) +{ + init(1, rs, -1, enable, d0, d1, d2, d3, 0, 0, 0, 0); +} + +void LiquidCrystal::init(uint8_t fourbitmode, uint8_t rs, uint8_t rw, uint8_t enable, + uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3, + uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7) +{ + _rs_pin = rs; + _rw_pin = rw; + _enable_pin = enable; + _data_pins[0] = d0; _data_pins[1] = d1; _data_pins[2] = d2; @@ -37,92 +66,244 @@ LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable, _data_pins[5] = d5; _data_pins[6] = d6; _data_pins[7] = d7; - + pinMode(_rs_pin, OUTPUT); - pinMode(_rw_pin, OUTPUT); + // we can save 1 pin by not using RW. Indicate by passing -1 instead of pin# + if (_rw_pin != -1) { + pinMode(_rw_pin, OUTPUT); + } pinMode(_enable_pin, OUTPUT); - for (int i = 0; i < 8; i++) - pinMode(_data_pins[i], OUTPUT); - - command(0x38); // function set: 8 bits, 1 line, 5x8 dots - command(0x0C); // display control: turn display on, cursor off, no blinking - command(0x06); // entry mode set: increment automatically, display shift, right shift - clear(); + if (fourbitmode) + _displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS; + else + _displayfunction = LCD_8BITMODE | LCD_1LINE | LCD_5x8DOTS; + + begin(16, 1); } -LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable, - uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3) : - _four_bit_mode(1), _rs_pin(rs), _rw_pin(rw), _enable_pin(enable) -{ - _data_pins[0] = d0; - _data_pins[1] = d1; - _data_pins[2] = d2; - _data_pins[3] = d3; - - pinMode(_rs_pin, OUTPUT); - pinMode(_rw_pin, OUTPUT); - pinMode(_enable_pin, OUTPUT); +void LiquidCrystal::begin(uint8_t cols, uint8_t lines, uint8_t dotsize) { + if (lines > 1) { + _displayfunction |= LCD_2LINE; + } + _numlines = lines; + _currline = 0; + + // for some 1 line displays you can select a 10 pixel high font + if ((dotsize != 0) && (lines == 1)) { + _displayfunction |= LCD_5x10DOTS; + } + + // SEE PAGE 45/46 FOR INITIALIZATION SPECIFICATION! + // according to datasheet, we need at least 40ms after power rises above 2.7V + // before sending commands. Arduino can turn on way befer 4.5V so we'll wait 50 + delayMicroseconds(50000); + // Now we pull both RS and R/W low to begin commands + digitalWrite(_rs_pin, LOW); + digitalWrite(_enable_pin, LOW); + if (_rw_pin != -1) { + digitalWrite(_rw_pin, LOW); + } - for (int i = 0; i < 4; i++) - pinMode(_data_pins[i], OUTPUT); - - command(0x28); // function set: 4 bits, 1 line, 5x8 dots - command(0x0C); // display control: turn display on, cursor off, no blinking - command(0x06); // entry mode set: increment automatically, display shift, right shift + //put the LCD into 4 bit or 8 bit mode + if (! (_displayfunction & LCD_8BITMODE)) { + // this is according to the hitachi HD44780 datasheet + // figure 24, pg 46 + + // we start in 8bit mode, try to set 4 bit mode + write4bits(0x03); + delayMicroseconds(4500); // wait min 4.1ms + + // second try + write4bits(0x03); + delayMicroseconds(4500); // wait min 4.1ms + + // third go! + write4bits(0x03); + delayMicroseconds(150); + + // finally, set to 8-bit interface + write4bits(0x02); + } else { + // this is according to the hitachi HD44780 datasheet + // page 45 figure 23 + + // Send function set command sequence + command(LCD_FUNCTIONSET | _displayfunction); + delayMicroseconds(4500); // wait more than 4.1ms + + // second try + command(LCD_FUNCTIONSET | _displayfunction); + delayMicroseconds(150); + + // third go + command(LCD_FUNCTIONSET | _displayfunction); + } + + // finally, set # lines, font size, etc. + command(LCD_FUNCTIONSET | _displayfunction); + + // turn the display on with no cursor or blinking default + _displaycontrol = LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF; + display(); + + // clear it off clear(); + + // Initialize to default text direction (for romance languages) + _displaymode = LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT; + // set the entry mode + command(LCD_ENTRYMODESET | _displaymode); + } +/********** high level commands, for the user! */ void LiquidCrystal::clear() { - command(0x01); // clear display, set cursor position to zero - delayMicroseconds(2000); + command(LCD_CLEARDISPLAY); // clear display, set cursor position to zero + delayMicroseconds(2000); // this command takes a long time! } void LiquidCrystal::home() { - command(0x02); // set cursor position to zero - delayMicroseconds(2000); + command(LCD_RETURNHOME); // set cursor position to zero + delayMicroseconds(2000); // this command takes a long time! } -void LiquidCrystal::setCursor(int col, int row) +void LiquidCrystal::setCursor(uint8_t col, uint8_t row) { int row_offsets[] = { 0x00, 0x40, 0x14, 0x54 }; - command(0x80 | (col + row_offsets[row])); + if ( row > _numlines ) { + row = _numlines-1; // we count rows starting w/0 + } + + command(LCD_SETDDRAMADDR | (col + row_offsets[row])); +} + +// Turn the display on/off (quickly) +void LiquidCrystal::noDisplay() { + _displaycontrol &= ~LCD_DISPLAYON; + command(LCD_DISPLAYCONTROL | _displaycontrol); +} +void LiquidCrystal::display() { + _displaycontrol |= LCD_DISPLAYON; + command(LCD_DISPLAYCONTROL | _displaycontrol); +} + +// Turns the underline cursor on/off +void LiquidCrystal::noCursor() { + _displaycontrol &= ~LCD_CURSORON; + command(LCD_DISPLAYCONTROL | _displaycontrol); +} +void LiquidCrystal::cursor() { + _displaycontrol |= LCD_CURSORON; + command(LCD_DISPLAYCONTROL | _displaycontrol); +} + +// Turn on and off the blinking cursor +void LiquidCrystal::noBlink() { + _displaycontrol &= ~LCD_BLINKON; + command(LCD_DISPLAYCONTROL | _displaycontrol); +} +void LiquidCrystal::blink() { + _displaycontrol |= LCD_BLINKON; + command(LCD_DISPLAYCONTROL | _displaycontrol); +} + +// These commands scroll the display without changing the RAM +void LiquidCrystal::scrollDisplayLeft(void) { + command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVELEFT); +} +void LiquidCrystal::scrollDisplayRight(void) { + command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVERIGHT); +} + +// This is for text that flows Left to Right +void LiquidCrystal::shiftLeft(void) { + _displaymode |= LCD_ENTRYLEFT; + command(LCD_ENTRYMODESET | _displaymode); +} + +// This is for text that flows Right to Left +void LiquidCrystal::shiftRight(void) { + _displaymode &= ~LCD_ENTRYLEFT; + command(LCD_ENTRYMODESET | _displaymode); +} + +// This will 'right justify' text from the cursor +void LiquidCrystal::shiftIncrement(void) { + _displaymode |= LCD_ENTRYSHIFTINCREMENT; + command(LCD_ENTRYMODESET | _displaymode); } -void LiquidCrystal::command(uint8_t value) { +// This will 'left justify' text from the cursor +void LiquidCrystal::shiftDecrement(void) { + _displaymode &= ~LCD_ENTRYSHIFTINCREMENT; + command(LCD_ENTRYMODESET | _displaymode); +} + +// Allows us to fill the first 8 CGRAM locations +// with custom characters +void LiquidCrystal::createChar(uint8_t location, uint8_t charmap[]) { + location &= 0x7; // we only have 8 locations 0-7 + command(LCD_SETCGRAMADDR | (location << 3)); + for (int i=0; i<8; i++) { + write(charmap[i]); + } +} + +/*********** mid level commands, for sending data/cmds */ + +inline void LiquidCrystal::command(uint8_t value) { send(value, LOW); } -void LiquidCrystal::write(uint8_t value) { +inline void LiquidCrystal::write(uint8_t value) { send(value, HIGH); } +/************ low level data pushing commands **********/ + +// write either command or data, with automatic 4/8-bit selection void LiquidCrystal::send(uint8_t value, uint8_t mode) { digitalWrite(_rs_pin, mode); - digitalWrite(_rw_pin, LOW); - - if (_four_bit_mode) { - for (int i = 0; i < 4; i++) { - digitalWrite(_data_pins[i], (value >> (i + 4)) & 0x01); - } - - digitalWrite(_enable_pin, HIGH); - digitalWrite(_enable_pin, LOW); - - for (int i = 0; i < 4; i++) { - digitalWrite(_data_pins[i], (value >> i) & 0x01); - } - digitalWrite(_enable_pin, HIGH); - digitalWrite(_enable_pin, LOW); + // if there is a RW pin indicated, set it low to Write + if (_rw_pin != -1) { + digitalWrite(_rw_pin, LOW); + } + + if (_displayfunction & LCD_8BITMODE) { + write8bits(value); } else { - for (int i = 0; i < 8; i++) { - digitalWrite(_data_pins[i], (value >> i) & 0x01); - } + write4bits(value>>4); + write4bits(value); + } +} + +void LiquidCrystal::pulseEnable(void) { + digitalWrite(_enable_pin, LOW); + delayMicroseconds(1); + digitalWrite(_enable_pin, HIGH); + delayMicroseconds(1); // enable pulse must be >450ns + digitalWrite(_enable_pin, LOW); + delayMicroseconds(100); // commands need > 37us to settle +} - digitalWrite(_enable_pin, HIGH); - digitalWrite(_enable_pin, LOW); +void LiquidCrystal::write4bits(uint8_t value) { + for (int i = 0; i < 4; i++) { + pinMode(_data_pins[i], OUTPUT); + digitalWrite(_data_pins[i], (value >> i) & 0x01); } + + pulseEnable(); +} + +void LiquidCrystal::write8bits(uint8_t value) { + for (int i = 0; i < 8; i++) { + pinMode(_data_pins[i], OUTPUT); + digitalWrite(_data_pins[i], (value >> i) & 0x01); + } + + pulseEnable(); } diff --git a/libraries/LiquidCrystal/LiquidCrystal.h b/libraries/LiquidCrystal/LiquidCrystal.h index a5edc5f..5a8d087 100755 --- a/libraries/LiquidCrystal/LiquidCrystal.h +++ b/libraries/LiquidCrystal/LiquidCrystal.h @@ -4,28 +4,103 @@ #include <inttypes.h> #include "Print.h" +// commands +#define LCD_CLEARDISPLAY 0x01 +#define LCD_RETURNHOME 0x02 +#define LCD_ENTRYMODESET 0x04 +#define LCD_DISPLAYCONTROL 0x08 +#define LCD_CURSORSHIFT 0x10 +#define LCD_FUNCTIONSET 0x20 +#define LCD_SETCGRAMADDR 0x40 +#define LCD_SETDDRAMADDR 0x80 + +// flags for display entry mode +#define LCD_ENTRYRIGHT 0x00 +#define LCD_ENTRYLEFT 0x02 +#define LCD_ENTRYSHIFTINCREMENT 0x01 +#define LCD_ENTRYSHIFTDECREMENT 0x00 + +// flags for display on/off control +#define LCD_DISPLAYON 0x04 +#define LCD_DISPLAYOFF 0x00 +#define LCD_CURSORON 0x02 +#define LCD_CURSOROFF 0x00 +#define LCD_BLINKON 0x01 +#define LCD_BLINKOFF 0x00 + +// flags for display/cursor shift +#define LCD_DISPLAYMOVE 0x08 +#define LCD_CURSORMOVE 0x00 +#define LCD_MOVERIGHT 0x04 +#define LCD_MOVELEFT 0x00 + +// flags for function set +#define LCD_8BITMODE 0x10 +#define LCD_4BITMODE 0x00 +#define LCD_2LINE 0x08 +#define LCD_1LINE 0x00 +#define LCD_5x10DOTS 0x04 +#define LCD_5x8DOTS 0x00 + class LiquidCrystal : public Print { public: - LiquidCrystal(uint8_t, uint8_t, uint8_t, uint8_t, uint8_t, uint8_t, uint8_t); - LiquidCrystal(uint8_t, uint8_t, uint8_t, uint8_t, uint8_t, uint8_t, uint8_t, - uint8_t, uint8_t, uint8_t, uint8_t); + LiquidCrystal(uint8_t rs, uint8_t enable, + uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3, + uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7); + LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable, + uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3, + uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7); + LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable, + uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3); + LiquidCrystal(uint8_t rs, uint8_t enable, + uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3); + + void init(uint8_t fourbitmode, uint8_t rs, uint8_t rw, uint8_t enable, + uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3, + uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7); + + void begin(uint8_t cols, uint8_t rows, uint8_t charsize = LCD_5x8DOTS); + void clear(); void home(); - void setCursor(int, int); - /* - void shiftDisplayLeft(); - void shiftDisplayRight(); - */ + + void noDisplay(); + void display(); + void noBlink(); + void blink(); + void noCursor(); + void cursor(); + void scrollDisplayLeft(); + void scrollDisplayRight(); + void printLeft(); + void printRight(); + void shiftLeft(); + void shiftRight(); + void shiftIncrement(); + void shiftDecrement(); + + void createChar(uint8_t, uint8_t[]); + void setCursor(uint8_t, uint8_t); virtual void write(uint8_t); void command(uint8_t); private: void send(uint8_t, uint8_t); - - uint8_t _four_bit_mode; + void write4bits(uint8_t); + void write8bits(uint8_t); + void pulseEnable(); + uint8_t _rs_pin; // LOW: command. HIGH: character. uint8_t _rw_pin; // LOW: write to LCD. HIGH: read from LCD. uint8_t _enable_pin; // activated by a HIGH pulse. uint8_t _data_pins[8]; + + uint8_t _displayfunction; + uint8_t _displaycontrol; + uint8_t _displaymode; + + uint8_t _initialized; + + uint8_t _numlines,_currline; }; #endif |