#include "LCDSoftI2C.h" #define SCL_PIN 4 // Arduino Pin 10 #define SCL_PORT PORTB #define SDA_PIN 5 // Arduino Pin 11 #define SDA_PORT PORTB #include #include #if defined(ARDUINO) && ARDUINO >= 100 #include "Arduino.h" #define printIIC(args) i2c_write(args) inline size_t LCDSoftI2C::write(uint8_t value) { send(value, Rs); return 1; } #else #include "WProgram.h" #define printIIC(args) Wire.send(args) inline void LCDSoftI2C::write(uint8_t value) { send(value, Rs); } #endif // 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). LCDSoftI2C::LCDSoftI2C(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 LCDSoftI2C::oled_init() { _oled = true; init_priv(); } void LCDSoftI2C::init() { init_priv(); } void LCDSoftI2C::init_priv() { i2c_init(); _displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS; begin(_cols, _rows); } void LCDSoftI2C::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 LCDSoftI2C::clear() { command(LCD_CLEARDISPLAY);// clear display, set cursor position to zero delayMicroseconds(2000); // this command takes a long time! if (_oled) setCursor(0, 0); } void LCDSoftI2C::home() { command(LCD_RETURNHOME); // set cursor position to zero delayMicroseconds(2000); // this command takes a long time! } void LCDSoftI2C::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 LCDSoftI2C::noDisplay() { _displaycontrol &= ~LCD_DISPLAYON; command(LCD_DISPLAYCONTROL | _displaycontrol); } void LCDSoftI2C::display() { _displaycontrol |= LCD_DISPLAYON; command(LCD_DISPLAYCONTROL | _displaycontrol); } // Turns the underline cursor on/off void LCDSoftI2C::noCursor() { _displaycontrol &= ~LCD_CURSORON; command(LCD_DISPLAYCONTROL | _displaycontrol); } void LCDSoftI2C::cursor() { _displaycontrol |= LCD_CURSORON; command(LCD_DISPLAYCONTROL | _displaycontrol); } // Turn on and off the blinking cursor void LCDSoftI2C::noBlink() { _displaycontrol &= ~LCD_BLINKON; command(LCD_DISPLAYCONTROL | _displaycontrol); } void LCDSoftI2C::blink() { _displaycontrol |= LCD_BLINKON; command(LCD_DISPLAYCONTROL | _displaycontrol); } // These commands scroll the display without changing the RAM void LCDSoftI2C::scrollDisplayLeft(void) { command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVELEFT); } void LCDSoftI2C::scrollDisplayRight(void) { command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVERIGHT); } // This is for text that flows Left to Right void LCDSoftI2C::leftToRight(void) { _displaymode |= LCD_ENTRYLEFT; command(LCD_ENTRYMODESET | _displaymode); } // This is for text that flows Right to Left void LCDSoftI2C::rightToLeft(void) { _displaymode &= ~LCD_ENTRYLEFT; command(LCD_ENTRYMODESET | _displaymode); } // This will 'right justify' text from the cursor void LCDSoftI2C::autoscroll(void) { _displaymode |= LCD_ENTRYSHIFTINCREMENT; command(LCD_ENTRYMODESET | _displaymode); } // This will 'left justify' text from the cursor void LCDSoftI2C::noAutoscroll(void) { _displaymode &= ~LCD_ENTRYSHIFTINCREMENT; command(LCD_ENTRYMODESET | _displaymode); } // Allows us to fill the first 8 CGRAM locations // with custom characters void LCDSoftI2C::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]); } } //createChar with PROGMEM input void LCDSoftI2C::createChar(uint8_t location, const char *charmap) { location &= 0x7; // we only have 8 locations 0-7 command(LCD_SETCGRAMADDR | (location << 3)); for (int i = 0; i < 8; i++) { write(pgm_read_byte_near(charmap++)); } } // Turn the (optional) backlight off/on void LCDSoftI2C::noBacklight(void) { _backlightval = LCD_NOBACKLIGHT; expanderWrite(0); } void LCDSoftI2C::backlight(void) { _backlightval = LCD_BACKLIGHT; expanderWrite(0); } /*********** mid level commands, for sending data/cmds */ inline void LCDSoftI2C::command(uint8_t value) { send(value, 0); } /************ low level data pushing commands **********/ // write either command or data void LCDSoftI2C::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 LCDSoftI2C::write4bits(uint8_t value) { expanderWrite(value); pulseEnable(value); } void LCDSoftI2C::expanderWrite(uint8_t _data) { i2c_start((_Addr << 1) | I2C_WRITE); printIIC((int)(_data) | _backlightval); i2c_stop(); } void LCDSoftI2C::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 LCDSoftI2C::cursor_on() { cursor(); } void LCDSoftI2C::cursor_off() { noCursor(); } void LCDSoftI2C::blink_on() { blink(); } void LCDSoftI2C::blink_off() { noBlink(); } void LCDSoftI2C::load_custom_character(uint8_t char_num, uint8_t *rows) { createChar(char_num, rows); } void LCDSoftI2C::setBacklight(uint8_t new_val) { if (new_val) { backlight(); // turn backlight on } else { noBacklight(); // turn backlight off } } void LCDSoftI2C::printstr(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); } // unsupported API functions #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wunused-parameter" void LCDSoftI2C::off() {} void LCDSoftI2C::on() {} void LCDSoftI2C::setDelay (int cmdDelay, int charDelay) {} uint8_t LCDSoftI2C::status() { return 0; } uint8_t LCDSoftI2C::keypad () { return 0; } uint8_t LCDSoftI2C::init_bargraph(uint8_t graphtype) { return 0; } void LCDSoftI2C::draw_horizontal_graph(uint8_t row, uint8_t column, uint8_t len, uint8_t pixel_col_end) {} void LCDSoftI2C::draw_vertical_graph(uint8_t row, uint8_t column, uint8_t len, uint8_t pixel_row_end) {} void LCDSoftI2C::setContrast(uint8_t new_val) {} #pragma GCC diagnostic pop