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comparison service/busyboxArduino/LiquidCrystal_V1.2.1/LiquidCrystal/LiquidCrystal_SR2W.cpp @ 154:58c47bfe0ce5

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add LiquidCrystal_V1.2.1 lib Ignore-this: ddfe8b0c1d6e19f210684520859d5a57
author drewp@bigasterisk.com
date Sat, 03 Jan 2015 23:35:16 -0800
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153:f8c5ec994768 154:58c47bfe0ce5
1 // ---------------------------------------------------------------------------
2 // Created/Adapted by Bill Perry 2012-03-16
3 // Copyright 2012 - Under creative commons license 3.0:
4 // Attribution-ShareAlike CC BY-SA
5 //
6 // This software is furnished "as is", without technical support, and with no
7 // warranty, express or implied, as to its usefulness for any purpose.
8 //
9 // Thread Safe: No
10 // Extendable: Yes
11 //
12 // @file LiquidCrystal_SR2W.cpp
13 // Connects a hd44780 LCD using 2 pins from the Arduino, via an 8-bit
14 // ShiftRegister (SR2W from now on).
15 //
16 // @brief
17 // This is a port of the ShiftRegLCD library from raron and ported to the
18 // LCD library.
19 //
20 //
21 // See the corresponding SR2W header file for full details.
22 //
23 // History
24 // 2012.03.29 bperrybap - Fixed incorrect use of 5x10 for default font
25 // (now matches original LQ library)
26 // Fixed typo in SR2W mask define names
27 // changed default backlight state to on
28 // 2012.03.16 bperrybap - created/modified from SR sources to create SR2W
29 // @author B. Perry - bperrybap@opensource.billsworld.billandterrie.com
30 // ---------------------------------------------------------------------------
31
32 #include "LiquidCrystal_SR2W.h"
33
34 // CONSTRUCTORS
35 // ---------------------------------------------------------------------------
36 // Assuming 1 line 8 pixel high font
37 LiquidCrystal_SR2W::LiquidCrystal_SR2W (uint8_t srdata, uint8_t srclock, t_backlighPol blpol)
38 {
39 init ( srdata, srclock, blpol, 1, 0 );
40 }
41
42
43 // PRIVATE METHODS
44 // ---------------------------------------------------------------------------
45
46 //
47 // init
48 void LiquidCrystal_SR2W::init(uint8_t srdata, uint8_t srclock, t_backlighPol blpol, uint8_t lines, uint8_t font)
49 {
50 _srDataRegister = fio_pinToOutputRegister(srdata);
51 _srDataMask = fio_pinToBit(srdata);
52 _srClockRegister = fio_pinToOutputRegister(srclock);
53 _srClockMask = fio_pinToBit(srclock);
54
55 _blPolarity = blpol;
56
57 _displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS;
58
59 backlight(); // set default backlight state to on
60 }
61
62 //
63 // loadSR
64 void LiquidCrystal_SR2W::loadSR(uint8_t val)
65 {
66 // Clear to keep Enable LOW while clocking in new bits
67 fio_shiftOut(_srDataRegister, _srDataMask, _srClockRegister, _srClockMask);
68
69
70 // clock out SR data byte
71 fio_shiftOut(_srDataRegister, _srDataMask, _srClockRegister, _srClockMask, val, MSBFIRST);
72
73
74 // strobe LCD enable which can now be toggled by the data line
75 ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
76 {
77 fio_digitalWrite_HIGH(_srDataRegister, _srDataMask);
78 waitUsec (1); // enable pulse must be >450ns
79 fio_digitalWrite_SWITCHTO(_srDataRegister, _srDataMask, LOW);
80 } // end critical section
81 }
82
83 // PUBLIC METHODS
84 // ---------------------------------------------------------------------------
85
86
87 /************ low level data pushing commands **********/
88 //
89 // send
90 void LiquidCrystal_SR2W::send(uint8_t value, uint8_t mode)
91 {
92 uint8_t myMode = ( mode == DATA ) ? SR2W_RS_MASK : 0;
93
94 myMode = myMode | SR2W_EN_MASK | _blMask;
95
96 if ( mode != FOUR_BITS )
97 {
98 loadSR(myMode | ((value >> 1) & SR2W_DATA_MASK)); // upper nibble
99 }
100
101 loadSR(myMode | ((value << 3) & SR2W_DATA_MASK)); // lower nibble
102
103 /*
104 * Don't call waitUsec()
105 * do our own delay optmization since this code is so fast it needs some added delay
106 * even on slower AVRs.
107 */
108 #if (F_CPU <= 16000000)
109 delayMicroseconds ( 10 ); // commands & data writes need > 37us to complete
110 #else
111 delayMicroseconds ( 37 ); // commands & data writes need > 37us to complete
112 #endif
113 }
114
115 //
116 // setBacklight
117 void LiquidCrystal_SR2W::setBacklight ( uint8_t value )
118 {
119 // Check for polarity to configure mask accordingly
120 // ----------------------------------------------------------
121 if ( ((_blPolarity == POSITIVE) && (value > 0)) ||
122 ((_blPolarity == NEGATIVE ) && ( value == 0 )) )
123 {
124 _blMask = SR2W_BL_MASK;
125 }
126 else
127 {
128 _blMask = 0;
129 }
130
131 // send dummy data of blMask to set BL pin
132 // Note: loadSR() will strobe the data line trying to pulse EN
133 // but E will not strobe because the EN output bit is not set.
134 loadSR(_blMask);
135 }