Migrating to Limor Fried's improved LiquidCrystal library.
This commit is contained in:
David A. Mellis
parent
f79f2e0d11
commit
cdeb912f7d
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@ -25,10 +25,39 @@
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// LiquidCrystal constructor is called).
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LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable,
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uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
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uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7) :
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_four_bit_mode(0), _rs_pin(rs), _rw_pin(rw), _enable_pin(enable)
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uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
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uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7)
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{
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init(0, rs, rw, enable, d0, d1, d2, d3, d4, d5, d6, d7);
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}
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LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t enable,
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uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
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uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7)
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{
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init(0, rs, -1, enable, d0, d1, d2, d3, d4, d5, d6, d7);
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}
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LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable,
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uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3)
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{
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init(1, rs, rw, enable, d0, d1, d2, d3, 0, 0, 0, 0);
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}
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LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t enable,
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uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3)
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{
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init(1, rs, -1, enable, d0, d1, d2, d3, 0, 0, 0, 0);
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}
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void LiquidCrystal::init(uint8_t fourbitmode, uint8_t rs, uint8_t rw, uint8_t enable,
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uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
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uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7)
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{
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_rs_pin = rs;
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_rw_pin = rw;
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_enable_pin = enable;
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_data_pins[0] = d0;
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_data_pins[1] = d1;
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_data_pins[2] = d2;
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@ -37,92 +66,244 @@ LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable,
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_data_pins[5] = d5;
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_data_pins[6] = d6;
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_data_pins[7] = d7;
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pinMode(_rs_pin, OUTPUT);
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pinMode(_rw_pin, OUTPUT);
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// we can save 1 pin by not using RW. Indicate by passing -1 instead of pin#
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if (_rw_pin != -1) {
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pinMode(_rw_pin, OUTPUT);
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}
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pinMode(_enable_pin, OUTPUT);
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for (int i = 0; i < 8; i++)
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pinMode(_data_pins[i], OUTPUT);
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command(0x38); // function set: 8 bits, 1 line, 5x8 dots
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command(0x0C); // display control: turn display on, cursor off, no blinking
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command(0x06); // entry mode set: increment automatically, display shift, right shift
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clear();
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if (fourbitmode)
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_displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS;
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else
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_displayfunction = LCD_8BITMODE | LCD_1LINE | LCD_5x8DOTS;
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begin(16, 1);
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}
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LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable,
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uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3) :
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_four_bit_mode(1), _rs_pin(rs), _rw_pin(rw), _enable_pin(enable)
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{
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_data_pins[0] = d0;
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_data_pins[1] = d1;
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_data_pins[2] = d2;
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_data_pins[3] = d3;
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void LiquidCrystal::begin(uint8_t cols, uint8_t lines, uint8_t dotsize) {
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if (lines > 1) {
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_displayfunction |= LCD_2LINE;
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}
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_numlines = lines;
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_currline = 0;
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// for some 1 line displays you can select a 10 pixel high font
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if ((dotsize != 0) && (lines == 1)) {
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_displayfunction |= LCD_5x10DOTS;
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}
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// SEE PAGE 45/46 FOR INITIALIZATION SPECIFICATION!
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// according to datasheet, we need at least 40ms after power rises above 2.7V
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// before sending commands. Arduino can turn on way befer 4.5V so we'll wait 50
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delayMicroseconds(50000);
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// Now we pull both RS and R/W low to begin commands
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digitalWrite(_rs_pin, LOW);
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digitalWrite(_enable_pin, LOW);
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if (_rw_pin != -1) {
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digitalWrite(_rw_pin, LOW);
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}
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pinMode(_rs_pin, OUTPUT);
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pinMode(_rw_pin, OUTPUT);
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pinMode(_enable_pin, OUTPUT);
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for (int i = 0; i < 4; i++)
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pinMode(_data_pins[i], OUTPUT);
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command(0x28); // function set: 4 bits, 1 line, 5x8 dots
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command(0x0C); // display control: turn display on, cursor off, no blinking
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command(0x06); // entry mode set: increment automatically, display shift, right shift
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//put the LCD into 4 bit or 8 bit mode
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if (! (_displayfunction & LCD_8BITMODE)) {
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// this is according to the hitachi HD44780 datasheet
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// figure 24, pg 46
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// we start in 8bit mode, try to set 4 bit mode
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write4bits(0x03);
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delayMicroseconds(4500); // wait min 4.1ms
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// second try
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write4bits(0x03);
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delayMicroseconds(4500); // wait min 4.1ms
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// third go!
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write4bits(0x03);
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delayMicroseconds(150);
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// finally, set to 8-bit interface
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write4bits(0x02);
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} else {
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// this is according to the hitachi HD44780 datasheet
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// page 45 figure 23
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// Send function set command sequence
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command(LCD_FUNCTIONSET | _displayfunction);
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delayMicroseconds(4500); // wait more than 4.1ms
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// second try
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command(LCD_FUNCTIONSET | _displayfunction);
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delayMicroseconds(150);
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// third go
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command(LCD_FUNCTIONSET | _displayfunction);
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}
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// finally, set # lines, font size, etc.
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command(LCD_FUNCTIONSET | _displayfunction);
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// turn the display on with no cursor or blinking default
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_displaycontrol = LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF;
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display();
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// clear it off
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clear();
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// Initialize to default text direction (for romance languages)
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_displaymode = LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT;
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// set the entry mode
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command(LCD_ENTRYMODESET | _displaymode);
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}
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/********** high level commands, for the user! */
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void LiquidCrystal::clear()
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{
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command(0x01); // clear display, set cursor position to zero
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delayMicroseconds(2000);
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command(LCD_CLEARDISPLAY); // clear display, set cursor position to zero
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delayMicroseconds(2000); // this command takes a long time!
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}
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void LiquidCrystal::home()
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{
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command(0x02); // set cursor position to zero
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delayMicroseconds(2000);
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command(LCD_RETURNHOME); // set cursor position to zero
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delayMicroseconds(2000); // this command takes a long time!
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}
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void LiquidCrystal::setCursor(int col, int row)
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void LiquidCrystal::setCursor(uint8_t col, uint8_t row)
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{
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int row_offsets[] = { 0x00, 0x40, 0x14, 0x54 };
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command(0x80 | (col + row_offsets[row]));
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if ( row > _numlines ) {
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row = _numlines-1; // we count rows starting w/0
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}
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command(LCD_SETDDRAMADDR | (col + row_offsets[row]));
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}
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void LiquidCrystal::command(uint8_t value) {
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// Turn the display on/off (quickly)
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void LiquidCrystal::noDisplay() {
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_displaycontrol &= ~LCD_DISPLAYON;
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command(LCD_DISPLAYCONTROL | _displaycontrol);
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}
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void LiquidCrystal::display() {
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_displaycontrol |= LCD_DISPLAYON;
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command(LCD_DISPLAYCONTROL | _displaycontrol);
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}
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// Turns the underline cursor on/off
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void LiquidCrystal::noCursor() {
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_displaycontrol &= ~LCD_CURSORON;
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command(LCD_DISPLAYCONTROL | _displaycontrol);
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}
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void LiquidCrystal::cursor() {
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_displaycontrol |= LCD_CURSORON;
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command(LCD_DISPLAYCONTROL | _displaycontrol);
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}
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// Turn on and off the blinking cursor
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void LiquidCrystal::noBlink() {
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_displaycontrol &= ~LCD_BLINKON;
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command(LCD_DISPLAYCONTROL | _displaycontrol);
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}
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void LiquidCrystal::blink() {
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_displaycontrol |= LCD_BLINKON;
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command(LCD_DISPLAYCONTROL | _displaycontrol);
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}
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// These commands scroll the display without changing the RAM
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void LiquidCrystal::scrollDisplayLeft(void) {
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command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVELEFT);
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}
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void LiquidCrystal::scrollDisplayRight(void) {
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command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVERIGHT);
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}
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// This is for text that flows Left to Right
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void LiquidCrystal::shiftLeft(void) {
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_displaymode |= LCD_ENTRYLEFT;
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command(LCD_ENTRYMODESET | _displaymode);
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}
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// This is for text that flows Right to Left
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void LiquidCrystal::shiftRight(void) {
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_displaymode &= ~LCD_ENTRYLEFT;
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command(LCD_ENTRYMODESET | _displaymode);
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}
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// This will 'right justify' text from the cursor
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void LiquidCrystal::shiftIncrement(void) {
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_displaymode |= LCD_ENTRYSHIFTINCREMENT;
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command(LCD_ENTRYMODESET | _displaymode);
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}
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// This will 'left justify' text from the cursor
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void LiquidCrystal::shiftDecrement(void) {
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_displaymode &= ~LCD_ENTRYSHIFTINCREMENT;
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command(LCD_ENTRYMODESET | _displaymode);
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}
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// Allows us to fill the first 8 CGRAM locations
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// with custom characters
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void LiquidCrystal::createChar(uint8_t location, uint8_t charmap[]) {
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location &= 0x7; // we only have 8 locations 0-7
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command(LCD_SETCGRAMADDR | (location << 3));
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for (int i=0; i<8; i++) {
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write(charmap[i]);
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}
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}
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/*********** mid level commands, for sending data/cmds */
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inline void LiquidCrystal::command(uint8_t value) {
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send(value, LOW);
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}
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void LiquidCrystal::write(uint8_t value) {
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inline void LiquidCrystal::write(uint8_t value) {
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send(value, HIGH);
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}
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/************ low level data pushing commands **********/
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// write either command or data, with automatic 4/8-bit selection
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void LiquidCrystal::send(uint8_t value, uint8_t mode) {
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digitalWrite(_rs_pin, mode);
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digitalWrite(_rw_pin, LOW);
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if (_four_bit_mode) {
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for (int i = 0; i < 4; i++) {
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digitalWrite(_data_pins[i], (value >> (i + 4)) & 0x01);
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}
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digitalWrite(_enable_pin, HIGH);
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digitalWrite(_enable_pin, LOW);
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for (int i = 0; i < 4; i++) {
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digitalWrite(_data_pins[i], (value >> i) & 0x01);
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}
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digitalWrite(_enable_pin, HIGH);
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digitalWrite(_enable_pin, LOW);
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// if there is a RW pin indicated, set it low to Write
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if (_rw_pin != -1) {
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digitalWrite(_rw_pin, LOW);
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}
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if (_displayfunction & LCD_8BITMODE) {
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write8bits(value);
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} else {
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for (int i = 0; i < 8; i++) {
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digitalWrite(_data_pins[i], (value >> i) & 0x01);
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}
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digitalWrite(_enable_pin, HIGH);
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digitalWrite(_enable_pin, LOW);
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write4bits(value>>4);
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write4bits(value);
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}
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}
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void LiquidCrystal::pulseEnable(void) {
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digitalWrite(_enable_pin, LOW);
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delayMicroseconds(1);
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digitalWrite(_enable_pin, HIGH);
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delayMicroseconds(1); // enable pulse must be >450ns
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digitalWrite(_enable_pin, LOW);
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delayMicroseconds(100); // commands need > 37us to settle
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}
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void LiquidCrystal::write4bits(uint8_t value) {
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for (int i = 0; i < 4; i++) {
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pinMode(_data_pins[i], OUTPUT);
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digitalWrite(_data_pins[i], (value >> i) & 0x01);
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}
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pulseEnable();
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}
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void LiquidCrystal::write8bits(uint8_t value) {
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for (int i = 0; i < 8; i++) {
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pinMode(_data_pins[i], OUTPUT);
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digitalWrite(_data_pins[i], (value >> i) & 0x01);
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}
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pulseEnable();
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}
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@ -4,28 +4,103 @@
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#include <inttypes.h>
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#include "Print.h"
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// commands
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#define LCD_CLEARDISPLAY 0x01
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#define LCD_RETURNHOME 0x02
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#define LCD_ENTRYMODESET 0x04
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#define LCD_DISPLAYCONTROL 0x08
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#define LCD_CURSORSHIFT 0x10
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#define LCD_FUNCTIONSET 0x20
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#define LCD_SETCGRAMADDR 0x40
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#define LCD_SETDDRAMADDR 0x80
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// flags for display entry mode
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#define LCD_ENTRYRIGHT 0x00
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#define LCD_ENTRYLEFT 0x02
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#define LCD_ENTRYSHIFTINCREMENT 0x01
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#define LCD_ENTRYSHIFTDECREMENT 0x00
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// flags for display on/off control
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#define LCD_DISPLAYON 0x04
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#define LCD_DISPLAYOFF 0x00
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#define LCD_CURSORON 0x02
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#define LCD_CURSOROFF 0x00
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#define LCD_BLINKON 0x01
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#define LCD_BLINKOFF 0x00
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// flags for display/cursor shift
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#define LCD_DISPLAYMOVE 0x08
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#define LCD_CURSORMOVE 0x00
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#define LCD_MOVERIGHT 0x04
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#define LCD_MOVELEFT 0x00
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// flags for function set
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#define LCD_8BITMODE 0x10
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#define LCD_4BITMODE 0x00
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#define LCD_2LINE 0x08
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#define LCD_1LINE 0x00
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#define LCD_5x10DOTS 0x04
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#define LCD_5x8DOTS 0x00
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class LiquidCrystal : public Print {
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public:
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LiquidCrystal(uint8_t, uint8_t, uint8_t, uint8_t, uint8_t, uint8_t, uint8_t);
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LiquidCrystal(uint8_t, uint8_t, uint8_t, uint8_t, uint8_t, uint8_t, uint8_t,
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uint8_t, uint8_t, uint8_t, uint8_t);
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LiquidCrystal(uint8_t rs, uint8_t enable,
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uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
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uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7);
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LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable,
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uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
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uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7);
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LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable,
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uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3);
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LiquidCrystal(uint8_t rs, uint8_t enable,
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uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3);
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void init(uint8_t fourbitmode, uint8_t rs, uint8_t rw, uint8_t enable,
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uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
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uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7);
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void begin(uint8_t cols, uint8_t rows, uint8_t charsize = LCD_5x8DOTS);
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void clear();
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void home();
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void setCursor(int, int);
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/*
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void shiftDisplayLeft();
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void shiftDisplayRight();
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*/
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void noDisplay();
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void display();
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void noBlink();
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void blink();
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void noCursor();
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void cursor();
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void scrollDisplayLeft();
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void scrollDisplayRight();
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void printLeft();
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void printRight();
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void shiftLeft();
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void shiftRight();
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void shiftIncrement();
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void shiftDecrement();
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void createChar(uint8_t, uint8_t[]);
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void setCursor(uint8_t, uint8_t);
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virtual void write(uint8_t);
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void command(uint8_t);
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private:
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void send(uint8_t, uint8_t);
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uint8_t _four_bit_mode;
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void write4bits(uint8_t);
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void write8bits(uint8_t);
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void pulseEnable();
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||||
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
|
||||
|
|
|
|||
Loading…
Reference in New Issue