IICLCD_LOWCOST
LiquidCrystal_I2C.h
- Committer:
- tsuparit
- Date:
- 2015-03-18
- Revision:
- 0:dbd7c46a32da
- Child:
- 1:83adfb305748
File content as of revision 0:dbd7c46a32da:
//Header // // 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 4 //B00000100 // Enable bit #define Rw 2 //B00000010 // Read/Write bit #define Rs 1 //B00000001 // Register select bit //public void LiquidCrystal_I2Cbegin(uint8_t cols, uint8_t rows, uint8_t charsize = LCD_5x8DOTS ); void LiquidCrystal_I2Cclear(); void LiquidCrystal_I2Chome(); void LiquidCrystal_I2CnoDisplay(); void LiquidCrystal_I2Cdisplay(); void LiquidCrystal_I2CnoBlink(); void LiquidCrystal_I2Cblink(); void LiquidCrystal_I2CnoCursor(); void LiquidCrystal_I2Ccursor(); void LiquidCrystal_I2CscrollDisplayLeft(); void LiquidCrystal_I2CscrollDisplayRight(); void LiquidCrystal_I2CprintLeft(); void LiquidCrystal_I2CprintRight(); void LiquidCrystal_I2CleftToRight(); void LiquidCrystal_I2CrightToLeft(); void LiquidCrystal_I2CshiftIncrement(); void LiquidCrystal_I2CshiftDecrement(); void LiquidCrystal_I2CnoBacklight(); void LiquidCrystal_I2Cbacklight(); void LiquidCrystal_I2Cautoscroll(); void LiquidCrystal_I2CnoAutoscroll(); void LiquidCrystal_I2CcreateChar(uint8_t, uint8_t[]); void LiquidCrystal_I2CsetCursor(uint8_t, uint8_t); void LiquidCrystal_I2Cwrite(uint8_t); void LiquidCrystal_I2Ccommand(uint8_t); void LiquidCrystal_I2Cinit(); //private void init_priv(); void send(uint8_t, uint8_t); void write4bits(uint8_t); void expanderWrite(uint8_t); void pulseEnable(uint8_t); //YWROBOT //last updated on 21/12/2011 //Tim Starling Fix the reset bug (Thanks Tim) //wiki doc http://www.dfrobot.com/wiki/index.php?title=I2C/TWI_LCD1602_Module_(SKU:_DFR0063) //Support Forum: http://www.dfrobot.com/forum/ //Compatible with the Arduino IDE 1.0 //Library version:1.1 I2C Wire(PTC11, PTC10); //SDA , SCL // When the display powers up, it is configured as follows: // // 1. Display clear // 2. Function set: // DL = 1; 8-bit interface data // N = 0; 1-line display // F = 0; 5x8 dot character font // 3. Display on/off control: // D = 0; Display off // C = 0; Cursor off // B = 0; Blinking off // 4. Entry mode set: // I/D = 1; Increment by 1 // S = 0; No shift // // Note, however, that resetting the Arduino doesn't reset the LCD, so we // can't assume that its in that state when a sketch starts (and the // LiquidCrystal constructor is called). uint8_t _Addr; uint8_t _displayfunction; uint8_t _displaycontrol; uint8_t _displaymode; uint8_t _numlines; uint8_t _cols; uint8_t _rows; uint8_t _backlightval; void delay(int msec) { wait_ms(msec); } void delayMicroseconds(int microsec) { wait_us(microsec); } void LiquidCrystal_I2C_SETUP(uint8_t lcd_Addr,uint8_t lcd_cols,uint8_t lcd_rows) { _Addr = lcd_Addr; _cols = lcd_cols; _rows = lcd_rows; _backlightval = LCD_NOBACKLIGHT; } void LiquidCrystal_I2Cinit(){ init_priv(); } void init_priv() { // Wire.begin(); _displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS; LiquidCrystal_I2Cbegin(_cols, _rows); } void LiquidCrystal_I2Cbegin(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. LiquidCrystal_I2Ccommand(LCD_FUNCTIONSET | _displayfunction); // turn the display on with no cursor or blinking default _displaycontrol = LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF; LiquidCrystal_I2Cdisplay(); // clear it off LiquidCrystal_I2Cclear(); // Initialize to default text direction (for roman languages) _displaymode = LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT; // set the entry mode LiquidCrystal_I2Ccommand(LCD_ENTRYMODESET | _displaymode); LiquidCrystal_I2Chome(); } /********** high level commands, for the user! */ void LiquidCrystal_I2Cclear(){ LiquidCrystal_I2Ccommand(LCD_CLEARDISPLAY);// clear display, set cursor position to zero delayMicroseconds(2000); // this command takes a long time! } void LiquidCrystal_I2Chome(){ LiquidCrystal_I2Ccommand(LCD_RETURNHOME); // set cursor position to zero delayMicroseconds(2000); // this command takes a long time! } void LiquidCrystal_I2CsetCursor(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 } LiquidCrystal_I2Ccommand(LCD_SETDDRAMADDR | (col + row_offsets[row])); } // Turn the display on/off (quickly) void LiquidCrystal_I2CnoDisplay() { _displaycontrol &= ~LCD_DISPLAYON; LiquidCrystal_I2Ccommand(LCD_DISPLAYCONTROL | _displaycontrol); } void LiquidCrystal_I2Cdisplay() { _displaycontrol |= LCD_DISPLAYON; LiquidCrystal_I2Ccommand(LCD_DISPLAYCONTROL | _displaycontrol); } // Turns the underline cursor on/off void LiquidCrystal_I2CnoCursor() { _displaycontrol &= ~LCD_CURSORON; LiquidCrystal_I2Ccommand(LCD_DISPLAYCONTROL | _displaycontrol); } void LiquidCrystal_I2Ccursor() { _displaycontrol |= LCD_CURSORON; LiquidCrystal_I2Ccommand(LCD_DISPLAYCONTROL | _displaycontrol); } // Turn on and off the blinking cursor void LiquidCrystal_I2CnoBlink() { _displaycontrol &= ~LCD_BLINKON; LiquidCrystal_I2Ccommand(LCD_DISPLAYCONTROL | _displaycontrol); } void LiquidCrystal_I2Cblink() { _displaycontrol |= LCD_BLINKON; LiquidCrystal_I2Ccommand(LCD_DISPLAYCONTROL | _displaycontrol); } // These commands scroll the display without changing the RAM void LiquidCrystal_I2CscrollDisplayLeft(void) { LiquidCrystal_I2Ccommand(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVELEFT); } void LiquidCrystal_I2CscrollDisplayRight(void) { LiquidCrystal_I2Ccommand(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVERIGHT); } // This is for text that flows Left to Right void LiquidCrystal_I2CleftToRight(void) { _displaymode |= LCD_ENTRYLEFT; LiquidCrystal_I2Ccommand(LCD_ENTRYMODESET | _displaymode); } // This is for text that flows Right to Left void LiquidCrystal_I2CrightToLeft(void) { _displaymode &= ~LCD_ENTRYLEFT; LiquidCrystal_I2Ccommand(LCD_ENTRYMODESET | _displaymode); } // This will 'right justify' text from the cursor void LiquidCrystal_I2Cautoscroll(void) { _displaymode |= LCD_ENTRYSHIFTINCREMENT; LiquidCrystal_I2Ccommand(LCD_ENTRYMODESET | _displaymode); } // This will 'left justify' text from the cursor void LiquidCrystal_I2CnoAutoscroll(void) { _displaymode &= ~LCD_ENTRYSHIFTINCREMENT; LiquidCrystal_I2Ccommand(LCD_ENTRYMODESET | _displaymode); } // Allows us to fill the first 8 CGRAM locations // with custom characters void LiquidCrystal_I2CcreateChar(uint8_t location, uint8_t charmap[]) { location &= 0x7; // we only have 8 locations 0-7 LiquidCrystal_I2Ccommand(LCD_SETCGRAMADDR | (location << 3)); for (int i=0; i<8; i++) { //write(charmap[i]); send(charmap[i], Rs); } } // Turn the (optional) backlight off/on void LiquidCrystal_I2CnoBacklight(void) { _backlightval=LCD_NOBACKLIGHT; expanderWrite(0); } void LiquidCrystal_I2Cbacklight(void) { _backlightval=LCD_BACKLIGHT; expanderWrite(0); } /*********** mid level commands, for sending data/cmds */ inline void LiquidCrystal_I2Ccommand(uint8_t value) { send(value, 0); } /************ low level data pushing commands **********/ // write either command or data void 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 write4bits(uint8_t value) { expanderWrite(value); pulseEnable(value); } void expanderWrite(uint8_t _data) { /* Wire.beginTransmission(_Addr); printIIC((int)(_data) | _backlightval); Wire.endTransmission(); */ char data[2]; data[0]= _data | _backlightval; // data[1]=val; char result=Wire.write(_Addr<<1,data,1); } void 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 } // Alias functions void LiquidCrystal_I2Ccursor_on(){ LiquidCrystal_I2Ccursor(); } void LiquidCrystal_I2Ccursor_off(){ LiquidCrystal_I2CnoCursor(); } void LiquidCrystal_I2Cblink_on(){ LiquidCrystal_I2Cblink(); } void LiquidCrystal_I2Cblink_off(){ LiquidCrystal_I2CnoBlink(); } void LiquidCrystal_I2Cload_custom_character(uint8_t char_num, uint8_t *rows){ LiquidCrystal_I2CcreateChar(char_num, rows); } void LiquidCrystal_I2CsetBacklight(uint8_t new_val){ if(new_val){ LiquidCrystal_I2Cbacklight(); // turn backlight on }else{ LiquidCrystal_I2CnoBacklight(); // turn backlight off } } /* void LiquidCrystal_I2Cprintstr(const char c[]){ //This function is not identical to the function used for "real" I2C displays //it's here so the user sketch doesn't have to be changed //print(c); send(c, Rs); } */ void LCDI2C4Bit_printIn( char value[] ) { for ( char *p = value; *p != 0; p++ ) { //LCDI2C4Bit_print(*p); send(*p, Rs); } } /* ize_t LiquidCrystal_I2C::write(uint8_t value) { send(value, Rs); return 0; } #else #include "WProgram.h" #define printIIC(args) Wire.send(args) inline void LiquidCrystal_I2C::write(uint8_t value) { send(value, Rs); } */