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253 lines
6.8 KiB
C++
253 lines
6.8 KiB
C++
#include "LiquidCrystal_I2C.h"
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#include <inttypes.h>
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#include <Arduino.h>
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#include <Wire.h>
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// When the display powers up, it is configured as follows:
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//
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// 1. Display clear
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// 2. Function set:
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// DL = 1; 8-bit interface data
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// N = 0; 1-line display
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// F = 0; 5x8 dot character font
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// 3. Display on/off control:
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// D = 0; Display off
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// C = 0; Cursor off
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// B = 0; Blinking off
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// 4. Entry mode set:
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// I/D = 1; Increment by 1
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// S = 0; No shift
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//
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// Note, however, that resetting the Arduino doesn't reset the LCD, so we
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// can't assume that its in that state when a sketch starts (and the
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// LiquidCrystal constructor is called).
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LiquidCrystal_I2C::LiquidCrystal_I2C(uint8_t lcd_addr, uint8_t lcd_cols, uint8_t lcd_rows, uint8_t charsize)
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{
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_addr = lcd_addr;
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_cols = lcd_cols;
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_rows = lcd_rows;
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_charsize = charsize;
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_backlightval = LCD_BACKLIGHT;
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}
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void LiquidCrystal_I2C::begin() {
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Wire.begin();
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_displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS;
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if (_rows > 1) {
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_displayfunction |= LCD_2LINE;
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}
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// for some 1 line displays you can select a 10 pixel high font
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if ((_charsize != 0) && (_rows == 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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delay(50);
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// Now we pull both RS and R/W low to begin commands
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expanderWrite(_backlightval); // reset expanderand turn backlight off (Bit 8 =1)
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delay(1000);
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//put the LCD into 4 bit mode
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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 << 4);
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delayMicroseconds(4500); // wait min 4.1ms
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// second try
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write4bits(0x03 << 4);
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delayMicroseconds(4500); // wait min 4.1ms
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// third go!
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write4bits(0x03 << 4);
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delayMicroseconds(150);
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// finally, set to 4-bit interface
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write4bits(0x02 << 4);
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// 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 roman 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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home();
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}
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/********** high level commands, for the user! */
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void LiquidCrystal_I2C::clear(){
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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_I2C::home(){
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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_I2C::setCursor(uint8_t col, uint8_t row){
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int row_offsets[] = { 0x00, 0x40, 0x14, 0x54 };
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if (row > _rows) {
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row = _rows-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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// Turn the display on/off (quickly)
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void LiquidCrystal_I2C::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_I2C::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_I2C::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_I2C::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_I2C::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_I2C::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_I2C::scrollDisplayLeft(void) {
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command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVELEFT);
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}
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void LiquidCrystal_I2C::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_I2C::leftToRight(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_I2C::rightToLeft(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_I2C::autoscroll(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_I2C::noAutoscroll(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_I2C::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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// Turn the (optional) backlight off/on
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void LiquidCrystal_I2C::noBacklight(void) {
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_backlightval=LCD_NOBACKLIGHT;
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expanderWrite(0);
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}
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void LiquidCrystal_I2C::backlight(void) {
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_backlightval=LCD_BACKLIGHT;
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expanderWrite(0);
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}
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/*********** mid level commands, for sending data/cmds */
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inline void LiquidCrystal_I2C::command(uint8_t value) {
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send(value, 0);
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}
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inline size_t LiquidCrystal_I2C::write(uint8_t value) {
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send(value, Rs);
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}
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/************ low level data pushing commands **********/
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// write either command or data
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void LiquidCrystal_I2C::send(uint8_t value, uint8_t mode) {
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uint8_t highnib=value&0xf0;
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uint8_t lownib=(value<<4)&0xf0;
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write4bits((highnib)|mode);
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write4bits((lownib)|mode);
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}
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void LiquidCrystal_I2C::write4bits(uint8_t value) {
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expanderWrite(value);
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pulseEnable(value);
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}
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void LiquidCrystal_I2C::expanderWrite(uint8_t _data){
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Wire.beginTransmission(_addr);
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Wire.write((int)(_data) | _backlightval);
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Wire.endTransmission();
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}
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void LiquidCrystal_I2C::pulseEnable(uint8_t _data){
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expanderWrite(_data | En); // En high
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delayMicroseconds(1); // enable pulse must be >450ns
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expanderWrite(_data & ~En); // En low
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delayMicroseconds(50); // commands need > 37us to settle
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}
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void LiquidCrystal_I2C::load_custom_character(uint8_t char_num, uint8_t *rows){
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createChar(char_num, rows);
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}
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void LiquidCrystal_I2C::setBacklight(uint8_t new_val){
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if (new_val) {
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backlight(); // turn backlight on
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} else {
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noBacklight(); // turn backlight off
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}
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}
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void LiquidCrystal_I2C::printstr(const char c[]){
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//This function is not identical to the function used for "real" I2C displays
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//it's here so the user sketch doesn't have to be changed
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print(c);
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}
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