--- /dev/null
+#include "LiquidCrystal.h"
+
+#include <stdio.h>
+#include <string.h>
+#include <inttypes.h>
+#include "WProgram.h"
+
+// 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).
+
+LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable,
+ uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
+ uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7)
+{
+ init(0, rs, rw, enable, d0, d1, d2, d3, d4, d5, d6, d7);
+}
+
+LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t enable,
+ uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
+ uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7)
+{
+ init(0, rs, 255, enable, d0, d1, d2, d3, d4, d5, d6, d7);
+}
+
+LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable,
+ uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3)
+{
+ init(1, rs, rw, enable, d0, d1, d2, d3, 0, 0, 0, 0);
+}
+
+LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t enable,
+ uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3)
+{
+ init(1, rs, 255, enable, d0, d1, d2, d3, 0, 0, 0, 0);
+}
+
+void LiquidCrystal::init(uint8_t fourbitmode, uint8_t rs, uint8_t rw, uint8_t enable,
+ uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
+ uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7)
+{
+ _rs_pin = rs;
+ _rw_pin = rw;
+ _enable_pin = enable;
+
+ _data_pins[0] = d0;
+ _data_pins[1] = d1;
+ _data_pins[2] = d2;
+ _data_pins[3] = d3;
+ _data_pins[4] = d4;
+ _data_pins[5] = d5;
+ _data_pins[6] = d6;
+ _data_pins[7] = d7;
+
+ pinMode(_rs_pin, OUTPUT);
+ // we can save 1 pin by not using RW. Indicate by passing 255 instead of pin#
+ if (_rw_pin != 255) {
+ pinMode(_rw_pin, OUTPUT);
+ }
+ pinMode(_enable_pin, OUTPUT);
+
+ if (fourbitmode)
+ _displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS;
+ else
+ _displayfunction = LCD_8BITMODE | LCD_1LINE | LCD_5x8DOTS;
+
+ begin(16, 1);
+}
+
+void LiquidCrystal::begin(uint8_t cols, uint8_t lines, uint8_t dotsize) {
+ if (lines > 1) {
+ _displayfunction |= LCD_2LINE;
+ }
+ _numlines = lines;
+ _currline = 0;
+
+ // 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
+ delayMicroseconds(50000);
+ // Now we pull both RS and R/W low to begin commands
+ digitalWrite(_rs_pin, LOW);
+ digitalWrite(_enable_pin, LOW);
+ if (_rw_pin != 255) {
+ digitalWrite(_rw_pin, LOW);
+ }
+
+ //put the LCD into 4 bit or 8 bit mode
+ if (! (_displayfunction & LCD_8BITMODE)) {
+ // 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);
+ delayMicroseconds(4500); // wait min 4.1ms
+
+ // second try
+ write4bits(0x03);
+ delayMicroseconds(4500); // wait min 4.1ms
+
+ // third go!
+ write4bits(0x03);
+ delayMicroseconds(150);
+
+ // finally, set to 4-bit interface
+ write4bits(0x02);
+ } else {
+ // this is according to the hitachi HD44780 datasheet
+ // page 45 figure 23
+
+ // Send function set command sequence
+ command(LCD_FUNCTIONSET | _displayfunction);
+ delayMicroseconds(4500); // wait more than 4.1ms
+
+ // second try
+ command(LCD_FUNCTIONSET | _displayfunction);
+ delayMicroseconds(150);
+
+ // third go
+ command(LCD_FUNCTIONSET | _displayfunction);
+ }
+
+ // finally, 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 romance languages)
+ _displaymode = LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT;
+ // set the entry mode
+ command(LCD_ENTRYMODESET | _displaymode);
+
+}
+
+/********** high level commands, for the user! */
+void LiquidCrystal::clear()
+{
+ command(LCD_CLEARDISPLAY); // clear display, set cursor position to zero
+ delayMicroseconds(2000); // this command takes a long time!
+}
+
+void LiquidCrystal::home()
+{
+ command(LCD_RETURNHOME); // set cursor position to zero
+ delayMicroseconds(2000); // this command takes a long time!
+}
+
+void LiquidCrystal::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 LiquidCrystal::noDisplay() {
+ _displaycontrol &= ~LCD_DISPLAYON;
+ command(LCD_DISPLAYCONTROL | _displaycontrol);
+}
+void LiquidCrystal::display() {
+ _displaycontrol |= LCD_DISPLAYON;
+ command(LCD_DISPLAYCONTROL | _displaycontrol);
+}
+
+// Turns the underline cursor on/off
+void LiquidCrystal::noCursor() {
+ _displaycontrol &= ~LCD_CURSORON;
+ command(LCD_DISPLAYCONTROL | _displaycontrol);
+}
+void LiquidCrystal::cursor() {
+ _displaycontrol |= LCD_CURSORON;
+ command(LCD_DISPLAYCONTROL | _displaycontrol);
+}
+
+// Turn on and off the blinking cursor
+void LiquidCrystal::noBlink() {
+ _displaycontrol &= ~LCD_BLINKON;
+ command(LCD_DISPLAYCONTROL | _displaycontrol);
+}
+void LiquidCrystal::blink() {
+ _displaycontrol |= LCD_BLINKON;
+ command(LCD_DISPLAYCONTROL | _displaycontrol);
+}
+
+// These commands scroll the display without changing the RAM
+void LiquidCrystal::scrollDisplayLeft(void) {
+ command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVELEFT);
+}
+void LiquidCrystal::scrollDisplayRight(void) {
+ command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVERIGHT);
+}
+
+// This is for text that flows Left to Right
+void LiquidCrystal::leftToRight(void) {
+ _displaymode |= LCD_ENTRYLEFT;
+ command(LCD_ENTRYMODESET | _displaymode);
+}
+
+// This is for text that flows Right to Left
+void LiquidCrystal::rightToLeft(void) {
+ _displaymode &= ~LCD_ENTRYLEFT;
+ command(LCD_ENTRYMODESET | _displaymode);
+}
+
+// This will 'right justify' text from the cursor
+void LiquidCrystal::autoscroll(void) {
+ _displaymode |= LCD_ENTRYSHIFTINCREMENT;
+ command(LCD_ENTRYMODESET | _displaymode);
+}
+
+// This will 'left justify' text from the cursor
+void LiquidCrystal::noAutoscroll(void) {
+ _displaymode &= ~LCD_ENTRYSHIFTINCREMENT;
+ command(LCD_ENTRYMODESET | _displaymode);
+}
+
+// Allows us to fill the first 8 CGRAM locations
+// with custom characters
+void LiquidCrystal::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]);
+ }
+}
+
+/*********** mid level commands, for sending data/cmds */
+
+inline void LiquidCrystal::command(uint8_t value) {
+ send(value, LOW);
+}
+
+inline void LiquidCrystal::write(uint8_t value) {
+ send(value, HIGH);
+}
+
+/************ low level data pushing commands **********/
+
+// write either command or data, with automatic 4/8-bit selection
+void LiquidCrystal::send(uint8_t value, uint8_t mode) {
+ digitalWrite(_rs_pin, mode);
+
+ // if there is a RW pin indicated, set it low to Write
+ if (_rw_pin != 255) {
+ digitalWrite(_rw_pin, LOW);
+ }
+
+ if (_displayfunction & LCD_8BITMODE) {
+ write8bits(value);
+ } else {
+ write4bits(value>>4);
+ write4bits(value);
+ }
+}
+
+void LiquidCrystal::pulseEnable(void) {
+ digitalWrite(_enable_pin, LOW);
+ delayMicroseconds(1);
+ digitalWrite(_enable_pin, HIGH);
+ delayMicroseconds(1); // enable pulse must be >450ns
+ digitalWrite(_enable_pin, LOW);
+ delayMicroseconds(100); // commands need > 37us to settle
+}
+
+void LiquidCrystal::write4bits(uint8_t value) {
+ for (int i = 0; i < 4; i++) {
+ pinMode(_data_pins[i], OUTPUT);
+ digitalWrite(_data_pins[i], (value >> i) & 0x01);
+ }
+
+ pulseEnable();
+}
+
+void LiquidCrystal::write8bits(uint8_t value) {
+ for (int i = 0; i < 8; i++) {
+ pinMode(_data_pins[i], OUTPUT);
+ digitalWrite(_data_pins[i], (value >> i) & 0x01);
+ }
+
+ pulseEnable();
+}
projects / lcdtest / commitdiff