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I2CLCD.h
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I2CLCD.h
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#include "Arduino.h"
#include "brzo_i2c.h"
#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
// flags for backlight control
#define LCD_BACKLIGHT 0x08
#define LCD_NOBACKLIGHT 0x00
#define En B00000100 // Enable bit
#define Rw B00000010 // Read/Write bit
#define Rs B00000001 // Register select bit
class I2CLCD : public Print {
public:
I2CLCD(uint8_t lcd_Addr,uint8_t lcd_cols,uint8_t lcd_rows);
I2CLCD(uint8_t lcd_Addr);
void begin(uint8_t cols, uint8_t rows, uint8_t charsize = LCD_5x8DOTS);
void clear();
void home();
void noDisplay();
void display();
void noBlink();
void blink();
void noCursor();
void cursor();
void scrollDisplayLeft();
void scrollDisplayRight();
void printLeft();
void printRight();
void leftToRight();
void rightToLeft();
void shiftIncrement();
void shiftDecrement();
void noBacklight();
void backlight();
void autoscroll();
void noAutoscroll();
void createChar(uint8_t, uint8_t[]);
void setCursor(uint8_t, uint8_t);
virtual size_t write(uint8_t);
void command(uint8_t);
void init();
private:
void init_priv();
void send(uint8_t, uint8_t);
void write4bits(uint8_t);
void expanderWrite(uint8_t);
void pulseEnable(uint8_t);
uint8_t _Addr;
uint8_t _displayfunction;
uint8_t _displaycontrol;
uint8_t _displaymode;
uint8_t _numlines;
uint8_t _cols;
uint8_t _rows;
uint8_t _backlightval;
};
inline size_t I2CLCD::write(uint8_t value) {
send(value, Rs);
return 1;
}
I2CLCD::I2CLCD(uint8_t lcd_Addr,uint8_t lcd_cols,uint8_t lcd_rows) {
_Addr = lcd_Addr;
_cols = lcd_cols;
_rows = lcd_rows;
_backlightval = LCD_NOBACKLIGHT;
}
I2CLCD::I2CLCD(uint8_t lcd_Addr) {
_Addr = lcd_Addr;
_cols = 20;
_rows = 4;
_backlightval = LCD_NOBACKLIGHT;
}
void I2CLCD::init() {
init_priv();
}
void I2CLCD::init_priv() {
_displayfunction = LCD_4BITMODE | LCD_2LINE | LCD_5x8DOTS;
begin(_cols, _rows);
}
void I2CLCD::begin(uint8_t cols, uint8_t lines, uint8_t dotsize) {
/* if(lines > 1) {
_displayfunction |= LCD_2LINE;
}*/
_numlines = lines;
// 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
delay(50);
// Now we pull both RS and R/W low to begin commands
expanderWrite(_backlightval); // reset expanderand turn backlight off (Bit 8 =1)
delay(1000);
//put the LCD into 4 bit mode
// 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 << 4);
delayMicroseconds(4500); // wait min 4.1ms
// second try
write4bits(0x03 << 4);
delayMicroseconds(4500); // wait min 4.1ms
// third go!
write4bits(0x03 << 4);
delayMicroseconds(150);
// finally, set to 4-bit interface
write4bits(0x02 << 4);
// 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 roman languages)
_displaymode = LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT;
// set the entry mode
command(LCD_ENTRYMODESET | _displaymode);
home();
}
/********** high level commands, for the user! */
void I2CLCD::clear() {
command(LCD_CLEARDISPLAY);// clear display, set cursor position to zero
delayMicroseconds(2000); // this command takes a long time!
}
void I2CLCD::home() {
command(LCD_RETURNHOME); // set cursor position to zero
delayMicroseconds(2000); // this command takes a long time!
}
void I2CLCD::setCursor(uint8_t col, uint8_t row) {
int row_offsets[] = { 0x00, 0x40, 0x14, 0x54 };
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 I2CLCD::noDisplay() {
_displaycontrol &= ~LCD_DISPLAYON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
void I2CLCD::display() {
_displaycontrol |= LCD_DISPLAYON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
// Turns the underline cursor on/off
void I2CLCD::noCursor() {
_displaycontrol &= ~LCD_CURSORON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
void I2CLCD::cursor() {
_displaycontrol |= LCD_CURSORON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
// Turn on and off the blinking cursor
void I2CLCD::noBlink() {
_displaycontrol &= ~LCD_BLINKON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
void I2CLCD::blink() {
_displaycontrol |= LCD_BLINKON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
// These commands scroll the display without changing the RAM
void I2CLCD::scrollDisplayLeft(void) {
command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVELEFT);
}
void I2CLCD::scrollDisplayRight(void) {
command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVERIGHT);
}
// This is for text that flows Left to Right
void I2CLCD::leftToRight(void) {
_displaymode |= LCD_ENTRYLEFT;
command(LCD_ENTRYMODESET | _displaymode);
}
// This is for text that flows Right to Left
void I2CLCD::rightToLeft(void) {
_displaymode &= ~LCD_ENTRYLEFT;
command(LCD_ENTRYMODESET | _displaymode);
}
// This will 'right justify' text from the cursor
void I2CLCD::autoscroll(void) {
_displaymode |= LCD_ENTRYSHIFTINCREMENT;
command(LCD_ENTRYMODESET | _displaymode);
}
// This will 'left justify' text from the cursor
void I2CLCD::noAutoscroll(void) {
_displaymode &= ~LCD_ENTRYSHIFTINCREMENT;
command(LCD_ENTRYMODESET | _displaymode);
}
// Allows us to fill the first 8 CGRAM locations
// with custom characters
void I2CLCD::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]);
}
}
// Turn the (optional) backlight off/on
void I2CLCD::noBacklight(void) {
_backlightval=LCD_NOBACKLIGHT;
expanderWrite(0);
}
void I2CLCD::backlight(void) {
_backlightval=LCD_BACKLIGHT;
expanderWrite(0);
}
/*********** mid level commands, for sending data/cmds */
inline void I2CLCD::command(uint8_t value) {
send(value, 0);
}
/************ low level data pushing commands **********/
// write either command or data
void I2CLCD::send(uint8_t value, uint8_t mode) {
uint8_t highnib=value&0xf0;
uint8_t lownib=(value<<4)&0xf0;
write4bits((highnib)|mode);
write4bits((lownib)|mode);
}
void I2CLCD::write4bits(uint8_t value) {
expanderWrite(value);
pulseEnable(value);
}
void I2CLCD::expanderWrite(uint8_t _data) {
if(enLcd) {
uint8_t bf[2];
brzo_i2c_start_transaction(_Addr, I2C_CLOCK_RATE);
bf[0] = _data | _backlightval;
brzo_i2c_write(bf, 1, false);
if(brzo_i2c_end_transaction()!=0) enLcd=0;
}
}
void I2CLCD::pulseEnable(uint8_t _data) {
expanderWrite(_data | En); // En high
delayMicroseconds(1); // enable pulse must be >450ns
expanderWrite(_data & ~En); // En low
delayMicroseconds(50); // commands need > 37us to settle
}
I2CLCD lcd(LCD_I2C_ADDRESS);
char LCDscr[81];
bool LCDdoinit=true;
int LCDscroll=4;
void LCDprintln(String s) {
// Serial.println(s);
if(LCDdoinit) {
LCDdoinit=false;
for(int i=0; i<80; i++) {
LCDscr[i]=' ';
}
LCDscr[80]='\0';
}
for(int i=0; i<20; i++) {
switch(LCDscroll) {
case 4:
LCDscr[i]=LCDscr[40+i];
case 3:
LCDscr[40+i]=LCDscr[20+i];
case 2:
LCDscr[20+i]=LCDscr[60+i];
}
}
int z=s.length()-1;
if(z>19) z=19;
for(int i=0; i<20; i++) {
if(i<=z) LCDscr[60+i]=s.charAt(i);
else LCDscr[60+i]=' ';
}
lcd.home();
lcd.print(LCDscr);
}
void LCDprintLeft(String s, uint8_t siz) {
int l=s.length();
if(l>siz) s=s.substring(0,siz);
else for(int i=0; i<(siz-l); i++) s+=' ';
lcd.print(s);
}
void LCDprintRight(String s, uint8_t siz) {
int l=s.length();
if(l>siz) s=s.substring(0,siz);
else for(int i=0; i<(siz-l); i++) s=' '+s;
lcd.print(s);
}
void initLCD() {
lcd.init();
lcd.backlight();
}