Zaneta B / TextLCD

my lcd

Fork of TextLCD by Simon Ford

TextLCD.cpp@9:609f5265134b, 2015-12-17 (annotated)

Committer:
Janet
Date:
Thu Dec 17 14:55:22 2015 +0000
Revision:
9:609f5265134b
Parent:
7:44f34c09bd37 
Zmiana przycisku i lcd

Who changed what in which revision?

UserRevisionLine numberNew contents of line
simon 1:ac48b187213c 1 /* mbed TextLCD Library, for a 4-bit LCD based on HD44780
simon 6:e4cb7ddee0d3 2 * Copyright (c) 2007-2010, sford, http://mbed.org
simon 1:ac48b187213c 3 *
simon 1:ac48b187213c 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
simon 1:ac48b187213c 5 * of this software and associated documentation files (the "Software"), to deal
simon 1:ac48b187213c 6 * in the Software without restriction, including without limitation the rights
simon 1:ac48b187213c 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
simon 1:ac48b187213c 8 * copies of the Software, and to permit persons to whom the Software is
simon 1:ac48b187213c 9 * furnished to do so, subject to the following conditions:
simon 1:ac48b187213c 10 *
simon 1:ac48b187213c 11 * The above copyright notice and this permission notice shall be included in
simon 1:ac48b187213c 12 * all copies or substantial portions of the Software.
simon 1:ac48b187213c 13 *
simon 1:ac48b187213c 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
simon 1:ac48b187213c 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
simon 1:ac48b187213c 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
simon 1:ac48b187213c 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
simon 1:ac48b187213c 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
simon 1:ac48b187213c 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
simon 1:ac48b187213c 20 * THE SOFTWARE.
simon 1:ac48b187213c 21 */
simon 1:ac48b187213c 22
simon 1:ac48b187213c 23 #include "TextLCD.h"
simon 1:ac48b187213c 24 #include "mbed.h"
simon 1:ac48b187213c 25
Janet 9:609f5265134b 26 namespace ext_text_lcd {
Janet 9:609f5265134b 27
Janet 9:609f5265134b 28 namespace {
Janet 9:609f5265134b 29 int makeLcdAddress(const TextLCD::LCDType &type, int column, int row) {
Janet 9:609f5265134b 30 return column + row * 0x40;
Janet 9:609f5265134b 31 }
Janet 9:609f5265134b 32
Janet 9:609f5265134b 33 int makeLcdAddress40(const TextLCD::LCDType &type, int column, int row) {
Janet 9:609f5265134b 34 return column + row * 40;
Janet 9:609f5265134b 35 }
Janet 9:609f5265134b 36
Janet 9:609f5265134b 37 int makeLcdAddress4Rows(const TextLCD::LCDType &type, int column, int row) {
Janet 9:609f5265134b 38 return column + (row % 2) * 0x40 + (row / 2) * 20;
Janet 9:609f5265134b 39 }
Janet 9:609f5265134b 40 }
Janet 9:609f5265134b 41
Janet 9:609f5265134b 42 const TextLCD::LCDType TextLCD::LCD16x2(16, 2, makeLcdAddress);
Janet 9:609f5265134b 43 const TextLCD::LCDType TextLCD::LCD16x2B(16, 2, makeLcdAddress40);
Janet 9:609f5265134b 44 const TextLCD::LCDType TextLCD::LCD20x2(20, 2, makeLcdAddress);
Janet 9:609f5265134b 45 const TextLCD::LCDType TextLCD::LCD20x4(20, 4, makeLcdAddress4Rows);
Janet 9:609f5265134b 46
simon 7:44f34c09bd37 47 TextLCD::TextLCD(PinName rs, PinName e, PinName d4, PinName d5,
Janet 9:609f5265134b 48 PinName d6, PinName d7, const LCDType &type) :
Janet 9:609f5265134b 49 _rs(rs), _e(e), _output(new BusOutput(d4, d5, d6, d7)),
Janet 9:609f5265134b 50 _type(type)
Janet 9:609f5265134b 51 {
Janet 9:609f5265134b 52 init();
Janet 9:609f5265134b 53 }
simon 1:ac48b187213c 54
Janet 9:609f5265134b 55 TextLCD::TextLCD(PinName rs, PinName e, PortName dport, std::size_t dlsb,
Janet 9:609f5265134b 56 const LCDType &type) :
Janet 9:609f5265134b 57 _rs(rs), _e(e), _output(new PortOutput(dport, dlsb)),
Janet 9:609f5265134b 58 _type(type)
Janet 9:609f5265134b 59 {
Janet 9:609f5265134b 60 init();
Janet 9:609f5265134b 61 }
Janet 9:609f5265134b 62
Janet 9:609f5265134b 63 void TextLCD::init() {
simon 1:ac48b187213c 64 _e = 1;
simon 1:ac48b187213c 65 _rs = 0; // command mode
simon 1:ac48b187213c 66
simon 1:ac48b187213c 67 wait(0.015); // Wait 15ms to ensure powered up
simon 1:ac48b187213c 68
simon 1:ac48b187213c 69 // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus)
simon 1:ac48b187213c 70 for (int i=0; i<3; i++) {
simon 1:ac48b187213c 71 writeByte(0x3);
simon 1:ac48b187213c 72 wait(0.00164); // this command takes 1.64ms, so wait for it
simon 1:ac48b187213c 73 }
simon 1:ac48b187213c 74 writeByte(0x2); // 4-bit mode
simon 1:ac48b187213c 75 wait(0.000040f); // most instructions take 40us
simon 1:ac48b187213c 76
simon 1:ac48b187213c 77 writeCommand(0x28); // Function set 001 BW N F - -
simon 1:ac48b187213c 78 writeCommand(0x0C);
simon 1:ac48b187213c 79 writeCommand(0x6); // Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes
simon 1:ac48b187213c 80 cls();
simon 1:ac48b187213c 81 }
simon 1:ac48b187213c 82
simon 1:ac48b187213c 83 void TextLCD::cls() {
simon 1:ac48b187213c 84 writeCommand(0x01); // cls, and set cursor to 0
simon 1:ac48b187213c 85 wait(0.00164f); // This command takes 1.64 ms
simon 1:ac48b187213c 86 locate(0, 0);
simon 1:ac48b187213c 87 }
simon 1:ac48b187213c 88
simon 1:ac48b187213c 89 void TextLCD::locate(int column, int row) {
simon 1:ac48b187213c 90 _column = column;
simon 1:ac48b187213c 91 _row = row;
Janet 9:609f5265134b 92
Janet 9:609f5265134b 93 int a = address(column, row);
Janet 9:609f5265134b 94 writeCommand(0x80 | a);
simon 1:ac48b187213c 95 }
simon 1:ac48b187213c 96
simon 1:ac48b187213c 97 int TextLCD::_putc(int value) {
Janet 9:609f5265134b 98 int column = _column;
Janet 9:609f5265134b 99 int row = _row;
simon 1:ac48b187213c 100 if (value == '\n') {
Janet 9:609f5265134b 101 column = 0;
Janet 9:609f5265134b 102 row = _row+1;
simon 1:ac48b187213c 103 } else {
Janet 9:609f5265134b 104 writeData(value);
Janet 9:609f5265134b 105 column++;
Janet 9:609f5265134b 106 if (column < columns()) {
Janet 9:609f5265134b 107 return value;
simon 1:ac48b187213c 108 }
Janet 9:609f5265134b 109
Janet 9:609f5265134b 110 column = 0;
Janet 9:609f5265134b 111 row++;
simon 1:ac48b187213c 112 }
Janet 9:609f5265134b 113 if (row >= rows()) {
Janet 9:609f5265134b 114 row = 0;
Janet 9:609f5265134b 115 }
Janet 9:609f5265134b 116 locate(column, row);
simon 1:ac48b187213c 117 return value;
simon 1:ac48b187213c 118 }
simon 1:ac48b187213c 119
simon 1:ac48b187213c 120 int TextLCD::_getc() {
simon 1:ac48b187213c 121 return -1;
simon 1:ac48b187213c 122 }
simon 1:ac48b187213c 123
simon 1:ac48b187213c 124 void TextLCD::writeByte(int value) {
Janet 9:609f5265134b 125 _output->writeNibble(value >> 4);
simon 1:ac48b187213c 126 wait(0.000040f); // most instructions take 40us
simon 1:ac48b187213c 127 _e = 0;
simon 1:ac48b187213c 128 wait(0.000040f);
simon 1:ac48b187213c 129 _e = 1;
Janet 9:609f5265134b 130 _output->writeNibble(value);
simon 1:ac48b187213c 131 wait(0.000040f);
simon 1:ac48b187213c 132 _e = 0;
simon 1:ac48b187213c 133 wait(0.000040f); // most instructions take 40us
simon 1:ac48b187213c 134 _e = 1;
simon 1:ac48b187213c 135 }
simon 1:ac48b187213c 136
simon 1:ac48b187213c 137 void TextLCD::writeCommand(int command) {
simon 1:ac48b187213c 138 _rs = 0;
simon 1:ac48b187213c 139 writeByte(command);
simon 1:ac48b187213c 140 }
simon 1:ac48b187213c 141
simon 1:ac48b187213c 142 void TextLCD::writeData(int data) {
simon 1:ac48b187213c 143 _rs = 1;
simon 1:ac48b187213c 144 writeByte(data);
simon 1:ac48b187213c 145 }
simon 1:ac48b187213c 146
Janet 9:609f5265134b 147 void TextLCD::setDisplayControl(DisplayControl d, CursorDisplayControl c, CursorStyle b)
Janet 9:609f5265134b 148 {
Janet 9:609f5265134b 149 writeCommand(0x08 | d | c | b);
simon 1:ac48b187213c 150 }
simon 1:ac48b187213c 151
Janet 9:609f5265134b 152 void TextLCD::writeToCGMem(unsigned addr, const char *buffer, std::size_t size)
Janet 9:609f5265134b 153 {
Janet 9:609f5265134b 154 writeCommand(0x40 | (addr & 0x3f));
Janet 9:609f5265134b 155 while (size > 0) {
Janet 9:609f5265134b 156 writeData(*buffer);
Janet 9:609f5265134b 157 size--;
Janet 9:609f5265134b 158 buffer++;
simon 1:ac48b187213c 159 }
Janet 9:609f5265134b 160
Janet 9:609f5265134b 161 locate(_column, _row);
simon 1:ac48b187213c 162 }
simon 1:ac48b187213c 163
Janet 9:609f5265134b 164 void TextLCD::BusOutput::writeNibble(int value) {
Janet 9:609f5265134b 165 _bus = value;
simon 1:ac48b187213c 166 }
Janet 9:609f5265134b 167
Janet 9:609f5265134b 168 void TextLCD::PortOutput::writeNibble(int value) {
Janet 9:609f5265134b 169 _port = value << _shift;
Janet 9:609f5265134b 170 }
Janet 9:609f5265134b 171
Janet 9:609f5265134b 172 } // ext_text_lcd namespace