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136 lines
4.1 KiB
C++
136 lines
4.1 KiB
C++
// ---------------------------------------------------------------------------
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// Created/Adapted by Bill Perry 2012-03-16
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// Copyright 2012 - Under creative commons license 3.0:
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// Attribution-ShareAlike CC BY-SA
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//
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// This software is furnished "as is", without technical support, and with no
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// warranty, express or implied, as to its usefulness for any purpose.
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//
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// Thread Safe: No
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// Extendable: Yes
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//
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// @file LiquidCrystal_SR2W.cpp
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// Connects a hd44780 LCD using 2 pins from the Arduino, via an 8-bit
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// ShiftRegister (SR2W from now on).
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//
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// @brief
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// This is a port of the ShiftRegLCD library from raron and ported to the
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// LCD library.
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//
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//
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// See the corresponding SR2W header file for full details.
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//
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// History
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// 2012.03.29 bperrybap - Fixed incorrect use of 5x10 for default font
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// (now matches original LQ library)
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// Fixed typo in SR2W mask define names
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// changed default backlight state to on
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// 2012.03.16 bperrybap - created/modified from SR sources to create SR2W
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// @author B. Perry - bperrybap@opensource.billsworld.billandterrie.com
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// ---------------------------------------------------------------------------
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#include "LiquidCrystal_SR2W.h"
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// CONSTRUCTORS
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// ---------------------------------------------------------------------------
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// Assuming 1 line 8 pixel high font
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LiquidCrystal_SR2W::LiquidCrystal_SR2W (uint8_t srdata, uint8_t srclock, t_backlighPol blpol)
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{
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init ( srdata, srclock, blpol, 1, 0 );
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}
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// PRIVATE METHODS
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// ---------------------------------------------------------------------------
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//
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// init
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void LiquidCrystal_SR2W::init(uint8_t srdata, uint8_t srclock, t_backlighPol blpol, uint8_t lines, uint8_t font)
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{
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_srDataRegister = fio_pinToOutputRegister(srdata);
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_srDataMask = fio_pinToBit(srdata);
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_srClockRegister = fio_pinToOutputRegister(srclock);
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_srClockMask = fio_pinToBit(srclock);
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_blPolarity = blpol;
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_displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS;
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backlight(); // set default backlight state to on
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}
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//
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// loadSR
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void LiquidCrystal_SR2W::loadSR(uint8_t val)
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{
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// Clear to keep Enable LOW while clocking in new bits
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fio_shiftOut(_srDataRegister, _srDataMask, _srClockRegister, _srClockMask);
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// clock out SR data byte
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fio_shiftOut(_srDataRegister, _srDataMask, _srClockRegister, _srClockMask, val, MSBFIRST);
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// strobe LCD enable which can now be toggled by the data line
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ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
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{
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fio_digitalWrite_HIGH(_srDataRegister, _srDataMask);
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waitUsec (1); // enable pulse must be >450ns
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fio_digitalWrite_SWITCHTO(_srDataRegister, _srDataMask, LOW);
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} // end critical section
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}
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// PUBLIC METHODS
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// ---------------------------------------------------------------------------
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/************ low level data pushing commands **********/
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//
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// send
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void LiquidCrystal_SR2W::send(uint8_t value, uint8_t mode)
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{
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uint8_t myMode = ( mode == DATA ) ? SR2W_RS_MASK : 0;
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myMode = myMode | SR2W_EN_MASK | _blMask;
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if ( mode != FOUR_BITS )
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{
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loadSR(myMode | ((value >> 1) & SR2W_DATA_MASK)); // upper nibble
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}
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loadSR(myMode | ((value << 3) & SR2W_DATA_MASK)); // lower nibble
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/*
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* Don't call waitUsec()
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* do our own delay optmization since this code is so fast it needs some added delay
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* even on slower AVRs.
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*/
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#if (F_CPU <= 16000000)
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delayMicroseconds ( 10 ); // commands & data writes need > 37us to complete
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#else
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delayMicroseconds ( 37 ); // commands & data writes need > 37us to complete
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#endif
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}
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//
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// setBacklight
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void LiquidCrystal_SR2W::setBacklight ( uint8_t value )
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{
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// Check for polarity to configure mask accordingly
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// ----------------------------------------------------------
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if ( ((_blPolarity == POSITIVE) && (value > 0)) ||
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((_blPolarity == NEGATIVE ) && ( value == 0 )) )
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{
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_blMask = SR2W_BL_MASK;
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}
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else
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{
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_blMask = 0;
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}
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// send dummy data of blMask to set BL pin
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// Note: loadSR() will strobe the data line trying to pulse EN
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// but E will not strobe because the EN output bit is not set.
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loadSR(_blMask);
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}
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