337 lines
9.7 KiB
C++
337 lines
9.7 KiB
C++
#include "LiquidCrystal.h"
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#include <stdio.h>
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#include <string.h>
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#include <WProgram.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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// This library has been modified to be compatible with the LeafLabs Maple;
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// very conservative timing is used due to problems with delayMicroseconds()
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// that should be fixed in the 0.0.7 release of the libmaple. [bnewbold]
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LiquidCrystal::LiquidCrystal(uint8 rs, uint8 rw, uint8 enable,
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uint8 d0, uint8 d1, uint8 d2, uint8 d3,
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uint8 d4, uint8 d5, uint8 d6, uint8 d7)
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{
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init(0, rs, rw, enable, d0, d1, d2, d3, d4, d5, d6, d7);
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}
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LiquidCrystal::LiquidCrystal(uint8 rs, uint8 enable,
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uint8 d0, uint8 d1, uint8 d2, uint8 d3,
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uint8 d4, uint8 d5, uint8 d6, uint8 d7)
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{
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init(0, rs, 255, enable, d0, d1, d2, d3, d4, d5, d6, d7);
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}
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LiquidCrystal::LiquidCrystal(uint8 rs, uint8 rw, uint8 enable,
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uint8 d0, uint8 d1, uint8 d2, uint8 d3)
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{
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init(1, rs, rw, enable, d0, d1, d2, d3, 0, 0, 0, 0);
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}
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LiquidCrystal::LiquidCrystal(uint8 rs, uint8 enable,
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uint8 d0, uint8 d1, uint8 d2, uint8 d3)
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{
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init(1, rs, 255, enable, d0, d1, d2, d3, 0, 0, 0, 0);
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}
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void LiquidCrystal::init(uint8 fourbitmode, uint8 rs, uint8 rw, uint8 enable,
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uint8 d0, uint8 d1, uint8 d2, uint8 d3,
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uint8 d4, uint8 d5, uint8 d6, uint8 d7)
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{
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_rs_pin = rs;
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_rw_pin = rw;
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_enable_pin = enable;
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_data_pins[0] = d0;
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_data_pins[1] = d1;
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_data_pins[2] = d2;
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_data_pins[3] = d3;
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_data_pins[4] = d4;
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_data_pins[5] = d5;
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_data_pins[6] = d6;
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_data_pins[7] = d7;
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displaymode=fourbitmode;
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if (fourbitmode)
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_displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS;
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else
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_displayfunction = LCD_8BITMODE | LCD_1LINE | LCD_5x8DOTS;
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// TODO: bnewbold, re-enable this?
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// begin(16, 1);
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}
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void LiquidCrystal::begin(uint8 cols, uint8 lines, uint8 dotsize) {
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for (int i = 0; i < 8 - displaymode * 4; i++) {
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//for (int i = 0; i <4; i++) {
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pinMode(_data_pins[i], OUTPUT);
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}
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pinMode(_rs_pin, OUTPUT);
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// we can save 1 pin by not using RW. Indicate by passing 255 instead of pin#
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if (_rw_pin != 255) {
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pinMode(_rw_pin, OUTPUT);
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}
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pinMode(_enable_pin, OUTPUT);
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if (lines > 1) {
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_displayfunction |= LCD_2LINE;
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}
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_numlines = lines;
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_currline = 0;
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// for some 1 line displays you can select a 10 pixel high font
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if ((dotsize != 0) && (lines == 1)) {
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_displayfunction |= LCD_5x10DOTS;
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}
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// SEE PAGE 45/46 FOR INITIALIZATION SPECIFICATION! according to
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// 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
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// we'll wait 50
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delay(50); // Maple mod
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//delayMicroseconds(50000);
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// Now we pull both RS and R/W low to begin commands
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digitalWrite(_rs_pin, LOW);
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digitalWrite(_enable_pin, LOW);
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if (_rw_pin != 255) {
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digitalWrite(_rw_pin, LOW);
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}
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//put the LCD into 4 bit or 8 bit mode
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if (! (_displayfunction & LCD_8BITMODE)) {
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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);
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delay(5); // Maple mod
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//delayMicroseconds(4500); // wait min 4.1ms
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// second try
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write4bits(0x03);
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delay(5); // Maple mod
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//delayMicroseconds(4500); // wait min 4.1ms
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// third go!
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write4bits(0x03);
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delay(1); // Maple mod
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//delayMicroseconds(150);
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// finally, set to 8-bit interface
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write4bits(0x02);
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} else {
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// this is according to the hitachi HD44780 datasheet
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// page 45 figure 23
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// Send function set command sequence
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command(LCD_FUNCTIONSET | _displayfunction);
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delay(5); // Maple mod
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//delayMicroseconds(4500); // wait more than 4.1ms
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// second try
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command(LCD_FUNCTIONSET | _displayfunction);
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delay(1); // Maple mod
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//delayMicroseconds(150);
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// third go
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command(LCD_FUNCTIONSET | _displayfunction);
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}
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// finally, 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 romance 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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}
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/********** high level commands, for the user! */
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void LiquidCrystal::clear()
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{
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command(LCD_CLEARDISPLAY); // clear display, set cursor position to zero
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delay(2); // Maple mod
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//delayMicroseconds(2000); // this command takes a long time!
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}
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void LiquidCrystal::home()
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{
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command(LCD_RETURNHOME); // set cursor position to zero
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delay(2); // Maple mod
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//delayMicroseconds(2000); // this command takes a long time!
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}
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void LiquidCrystal::setCursor(uint8 col, uint8 row)
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{
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int row_offsets[] = { 0x00, 0x40, 0x14, 0x54 };
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if ( row > _numlines ) {
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row = _numlines-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::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::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::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::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::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::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::scrollDisplayLeft(void) {
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command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVELEFT);
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}
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void LiquidCrystal::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::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::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::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::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::createChar(uint8 location, uint8 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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/*********** mid level commands, for sending data/cmds */
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inline void LiquidCrystal::command(uint8 value) {
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send(value, LOW);
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}
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inline size_t LiquidCrystal::write(uint8 value) {
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send(value, HIGH);
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return 1;
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}
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/************ low level data pushing commands **********/
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// write either command or data, with automatic 4/8-bit selection
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void LiquidCrystal::send(uint8 value, uint8 mode) {
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digitalWrite(_rs_pin, mode);
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// if there is a RW pin indicated, set it low to Write
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if (_rw_pin != 255) {
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digitalWrite(_rw_pin, LOW);
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}
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if (_displayfunction & LCD_8BITMODE) {
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write8bits(value);
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} else {
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write4bits(value>>4);
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write4bits(value);
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}
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}
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void LiquidCrystal::pulseEnable(void) {
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// _enable_pin should already be LOW (unless someone else messed
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// with it), so don't sit around waiting for long.
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digitalWrite(_enable_pin, LOW);
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delayMicroseconds(1);
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// Enable pulse must be > 450 ns. Value chosen here according to
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// the following threads:
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// http://forums.leaflabs.com/topic.php?id=640
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// http://forums.leaflabs.com/topic.php?id=512
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gpio_toggle_bit(PIN_MAP[_enable_pin].gpio_device, PIN_MAP[_enable_pin].gpio_bit);// togglePin(_enable_pin);
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delayMicroseconds(1);
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gpio_toggle_bit(PIN_MAP[_enable_pin].gpio_device, PIN_MAP[_enable_pin].gpio_bit);// togglePin(_enable_pin);
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// Commands needs > 37us to settle.
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delayMicroseconds(42);
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}
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void LiquidCrystal::write4bits(uint8 value) {
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for (int i = 0; i < 4; i++) {
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digitalWrite(_data_pins[i], (value >> i) & 0x01);
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}
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pulseEnable();
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}
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void LiquidCrystal::write8bits(uint8 value) {
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for (int i = 0; i < 8; i++) {
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digitalWrite(_data_pins[i], (value >> i) & 0x01);
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}
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pulseEnable();
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}
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