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https://github.com/zyphlar/open-access-control-minimal-http.git
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349 lines
9.5 KiB
C++
349 lines
9.5 KiB
C++
#include "ShiftLCD.h"
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#include <stdio.h>
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#include <string.h>
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#include <inttypes.h>
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#include "Arduino.h"
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/**
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* This is a modified version of the standard LiquidCrystal class that
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* ships with the Arduino software.
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*
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* It has been modified to work with either one or two eight bit shift registers
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* in 4 and 8 bit mode respectivly
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*
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* The original file was released under the LGPL licence which I have to confess
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* I found more than a little confusing. I belive that I am obligated to release
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* this software under the GPL licence, as it is a derivitive work:
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* (if not, I am very sorry and please tell me what I should hve done)
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*
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*******************************************************************************
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ShiftLCD, allows the HD44780 LCD to be opertaed via a shift register
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Copyright (C) 2010 Chris Parish
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*******************************************************************************
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* Please see the example files for usage information
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*/
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ShiftLCD::ShiftLCD(uint8_t dp, uint8_t cp, uint8_t lp, uint8_t mode)
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{
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init (dp, cp, lp, mode);
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}
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void ShiftLCD::init(uint8_t dp, uint8_t cp, uint8_t lp, uint8_t mode)
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{
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_data_pin = dp;
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_clock_pin = cp;
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_latch_pin = lp;
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_backlight = LCD_BL_PIN;
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pinMode(_data_pin, OUTPUT);
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pinMode(_clock_pin, OUTPUT);
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pinMode(_latch_pin, OUTPUT);
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if (mode <= 4)
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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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begin(16, 1);
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}
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void ShiftLCD::begin(uint8_t cols, uint8_t lines, uint8_t dotsize) {
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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!
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// according to 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 we'll wait 50
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delayMicroseconds(50000);
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// clear the shift register by sending 16 0's to it
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shiftOut(_data_pin, _clock_pin, LSBFIRST, B00000000);
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shiftOut(_data_pin, _clock_pin, LSBFIRST, B00000000);
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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, LOW);
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delayMicroseconds(4500); // wait min 4.1ms
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// second try
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write4bits(0x03, LOW);
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delayMicroseconds(4500); // wait min 4.1ms
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// third go!
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write4bits(0x03, LOW);
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delayMicroseconds(150);
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// finally, set to 8-bit interface
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write4bits(0x02, LOW);
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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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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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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 ShiftLCD::clear()
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{
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command(LCD_CLEARDISPLAY); // clear display, set cursor position to zero
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delayMicroseconds(2000); // this command takes a long time!
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}
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void ShiftLCD::home()
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{
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command(LCD_RETURNHOME); // set cursor position to zero
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delayMicroseconds(2000); // this command takes a long time!
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}
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void ShiftLCD::setCursor(uint8_t col, uint8_t 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 ShiftLCD::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 ShiftLCD::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 ShiftLCD::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 ShiftLCD::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 ShiftLCD::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 ShiftLCD::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 ShiftLCD::scrollDisplayLeft(void) {
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command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVELEFT);
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}
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void ShiftLCD::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 ShiftLCD::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 ShiftLCD::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 ShiftLCD::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 ShiftLCD::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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// This will turn the backlight on
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void ShiftLCD::backlightOn(void) {
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_backlight = LCD_BL_PIN;
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updateBacklight();
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}
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// This will turn the backlight off
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void ShiftLCD::backlightOff(void) {
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_backlight &= ~LCD_BL_PIN;
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updateBacklight();
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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 ShiftLCD::createChar(uint8_t location, uint8_t 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 ShiftLCD::command(uint8_t value) {
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send(value, false);
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}
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inline size_t ShiftLCD::write(uint8_t value) {
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send(value, true);
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return 1;
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}
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/************ low level data pushing commands **********/
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void ShiftLCD::updateBacklight(void) {
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if (_displayfunction & LCD_8BITMODE) {
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digitalWrite(_latch_pin, HIGH);
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shiftOut(_data_pin, _clock_pin, LSBFIRST, _backlight);
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shiftOut(_data_pin, _clock_pin, LSBFIRST, B00000000);
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digitalWrite(_latch_pin, LOW);
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} else {
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digitalWrite(_latch_pin, HIGH);
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shiftOut(_data_pin, _clock_pin, LSBFIRST, _backlight);
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digitalWrite(_latch_pin, LOW);
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}
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}
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// write either command or data, with automatic 4/8-bit selection
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void ShiftLCD::send(uint8_t value, uint8_t mode) {
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if (_displayfunction & LCD_8BITMODE) {
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write8bits(value, mode);
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} else {
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write4bits(value>>4, mode);
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write4bits(value, mode);
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}
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}
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void ShiftLCD::write4bits(uint8_t value, uint8_t mode) {
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int EN_SWITCH = B00000010;
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int RS_SWITCH = B00000001;
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int cmd = 0;
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int data = 0;
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if (!mode) {
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cmd = 0 | _backlight;
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} else {
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cmd = LCD_RS_PIN | _backlight;
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}
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data = value<<4 & B11110000;
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cmd |= EN_SWITCH;
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digitalWrite(_latch_pin, HIGH);
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shiftOut(_data_pin, _clock_pin, LSBFIRST, data | cmd);
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digitalWrite(_latch_pin, LOW);
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delayMicroseconds(1);
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cmd &= ~EN_SWITCH;
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digitalWrite(_latch_pin, HIGH);
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shiftOut (_data_pin, _clock_pin, LSBFIRST, data | cmd);
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digitalWrite(_latch_pin, LOW);
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delayMicroseconds(1);
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cmd |= EN_SWITCH;
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digitalWrite(_latch_pin, HIGH);
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shiftOut(_data_pin, _clock_pin, LSBFIRST, data | cmd);
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digitalWrite(_latch_pin, LOW);
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delayMicroseconds(100);
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}
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void ShiftLCD::write8bits(uint8_t value, uint8_t mode) {
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int EN_SWITCH = B00000010;
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int RS_SWITCH = B00000001;
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int cmd = 0;
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if (!mode) {
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cmd = 0;
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} else {
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cmd = RS_SWITCH;
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}
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//set enable low
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cmd |= EN_SWITCH;
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digitalWrite (_latch_pin, HIGH);
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shiftOut(_data_pin, _clock_pin, LSBFIRST, cmd);
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shiftOut(_data_pin, _clock_pin, LSBFIRST, value);
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digitalWrite (_latch_pin, LOW);
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//delay (500);
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//set enable high;
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cmd &= ~EN_SWITCH;
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digitalWrite (_latch_pin, HIGH);
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shiftOut(_data_pin, _clock_pin, LSBFIRST, cmd);
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shiftOut(_data_pin, _clock_pin, LSBFIRST, value);
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digitalWrite (_latch_pin, LOW);
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delayMicroseconds (1);
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//delay (500);
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//set enable low
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cmd |= EN_SWITCH;
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digitalWrite (_latch_pin, HIGH);
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shiftOut(_data_pin, _clock_pin, LSBFIRST, cmd);
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shiftOut(_data_pin, _clock_pin, LSBFIRST, value);
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digitalWrite (_latch_pin, LOW);
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delayMicroseconds (100);
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}
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