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CLEO_UART_TEXTLCD
SMART CLEO Uart Text Lcd
TextLCD/TextLCD.cpp@0:21b4d8237564, 2017-09-28 (annotated)
- Committer:
- SMART_CLEO
- Date:
- Thu Sep 28 03:42:07 2017 +0000
- Revision:
- 0:21b4d8237564
SMART_CLEO
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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SMART_CLEO | 0:21b4d8237564 | 1 | /* mbed TextLCD Library, for a 4-bit LCD based on HD44780 |
SMART_CLEO | 0:21b4d8237564 | 2 | * Copyright (c) 2007-2010, sford |
SMART_CLEO | 0:21b4d8237564 | 3 | * |
SMART_CLEO | 0:21b4d8237564 | 4 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
SMART_CLEO | 0:21b4d8237564 | 5 | * of this software and associated documentation files (the "Software"), to deal |
SMART_CLEO | 0:21b4d8237564 | 6 | * in the Software without restriction, including without limitation the rights |
SMART_CLEO | 0:21b4d8237564 | 7 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
SMART_CLEO | 0:21b4d8237564 | 8 | * copies of the Software, and to permit persons to whom the Software is |
SMART_CLEO | 0:21b4d8237564 | 9 | * furnished to do so, subject to the following conditions: |
SMART_CLEO | 0:21b4d8237564 | 10 | * |
SMART_CLEO | 0:21b4d8237564 | 11 | * The above copyright notice and this permission notice shall be included in |
SMART_CLEO | 0:21b4d8237564 | 12 | * all copies or substantial portions of the Software. |
SMART_CLEO | 0:21b4d8237564 | 13 | * |
SMART_CLEO | 0:21b4d8237564 | 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
SMART_CLEO | 0:21b4d8237564 | 15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
SMART_CLEO | 0:21b4d8237564 | 16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
SMART_CLEO | 0:21b4d8237564 | 17 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
SMART_CLEO | 0:21b4d8237564 | 18 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
SMART_CLEO | 0:21b4d8237564 | 19 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
SMART_CLEO | 0:21b4d8237564 | 20 | * THE SOFTWARE. |
SMART_CLEO | 0:21b4d8237564 | 21 | */ |
SMART_CLEO | 0:21b4d8237564 | 22 | |
SMART_CLEO | 0:21b4d8237564 | 23 | #include "TextLCD.h" |
SMART_CLEO | 0:21b4d8237564 | 24 | #include "mbed.h" |
SMART_CLEO | 0:21b4d8237564 | 25 | |
SMART_CLEO | 0:21b4d8237564 | 26 | TextLCD::TextLCD(PinName rs, PinName rw, PinName e, PinName d0, PinName d1, |
SMART_CLEO | 0:21b4d8237564 | 27 | PinName d2, PinName d3, LCDType type) : _rs(rs), _rw(rw), |
SMART_CLEO | 0:21b4d8237564 | 28 | _e(e), _d(d0, d1, d2, d3), |
SMART_CLEO | 0:21b4d8237564 | 29 | _type(type) { |
SMART_CLEO | 0:21b4d8237564 | 30 | |
SMART_CLEO | 0:21b4d8237564 | 31 | _rw = 0; |
SMART_CLEO | 0:21b4d8237564 | 32 | _e = 1; |
SMART_CLEO | 0:21b4d8237564 | 33 | _rs = 0; // command mode |
SMART_CLEO | 0:21b4d8237564 | 34 | _d.output(); |
SMART_CLEO | 0:21b4d8237564 | 35 | |
SMART_CLEO | 0:21b4d8237564 | 36 | wait(0.015); // Wait 15ms to ensure powered up |
SMART_CLEO | 0:21b4d8237564 | 37 | |
SMART_CLEO | 0:21b4d8237564 | 38 | // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus) |
SMART_CLEO | 0:21b4d8237564 | 39 | for (int i=0; i<3; i++) { |
SMART_CLEO | 0:21b4d8237564 | 40 | writeByte(0x3); |
SMART_CLEO | 0:21b4d8237564 | 41 | wait(0.00164); // this command takes 1.64ms, so wait for it |
SMART_CLEO | 0:21b4d8237564 | 42 | } |
SMART_CLEO | 0:21b4d8237564 | 43 | writeByte(0x2); // 4-bit mode |
SMART_CLEO | 0:21b4d8237564 | 44 | wait(0.000040f); // most instructions take 40us |
SMART_CLEO | 0:21b4d8237564 | 45 | |
SMART_CLEO | 0:21b4d8237564 | 46 | writeCommand(0x28); // Function set 001 BW N F - - |
SMART_CLEO | 0:21b4d8237564 | 47 | writeCommand(0x0C); |
SMART_CLEO | 0:21b4d8237564 | 48 | writeCommand(0x6); // Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes |
SMART_CLEO | 0:21b4d8237564 | 49 | cls(); |
SMART_CLEO | 0:21b4d8237564 | 50 | } |
SMART_CLEO | 0:21b4d8237564 | 51 | |
SMART_CLEO | 0:21b4d8237564 | 52 | void TextLCD::character(int column, int row, int c) { |
SMART_CLEO | 0:21b4d8237564 | 53 | int a = address(column, row); |
SMART_CLEO | 0:21b4d8237564 | 54 | writeCommand(a); |
SMART_CLEO | 0:21b4d8237564 | 55 | writeData(c); |
SMART_CLEO | 0:21b4d8237564 | 56 | } |
SMART_CLEO | 0:21b4d8237564 | 57 | |
SMART_CLEO | 0:21b4d8237564 | 58 | void TextLCD::cls() { |
SMART_CLEO | 0:21b4d8237564 | 59 | writeCommand(0x01); // cls, and set cursor to 0 |
SMART_CLEO | 0:21b4d8237564 | 60 | wait(0.00164f); // This command takes 1.64 ms |
SMART_CLEO | 0:21b4d8237564 | 61 | locate(0, 0); |
SMART_CLEO | 0:21b4d8237564 | 62 | } |
SMART_CLEO | 0:21b4d8237564 | 63 | |
SMART_CLEO | 0:21b4d8237564 | 64 | void TextLCD::locate(int column, int row) { |
SMART_CLEO | 0:21b4d8237564 | 65 | _column = column; |
SMART_CLEO | 0:21b4d8237564 | 66 | _row = row; |
SMART_CLEO | 0:21b4d8237564 | 67 | } |
SMART_CLEO | 0:21b4d8237564 | 68 | |
SMART_CLEO | 0:21b4d8237564 | 69 | int TextLCD::_putc(int value) { |
SMART_CLEO | 0:21b4d8237564 | 70 | if (value == '\n') { |
SMART_CLEO | 0:21b4d8237564 | 71 | _column = 0; |
SMART_CLEO | 0:21b4d8237564 | 72 | _row++; |
SMART_CLEO | 0:21b4d8237564 | 73 | if (_row >= rows()) { |
SMART_CLEO | 0:21b4d8237564 | 74 | _row = 0; |
SMART_CLEO | 0:21b4d8237564 | 75 | } |
SMART_CLEO | 0:21b4d8237564 | 76 | } else { |
SMART_CLEO | 0:21b4d8237564 | 77 | character(_column, _row, value); |
SMART_CLEO | 0:21b4d8237564 | 78 | _column++; |
SMART_CLEO | 0:21b4d8237564 | 79 | if (_column >= columns()) { |
SMART_CLEO | 0:21b4d8237564 | 80 | _column = 0; |
SMART_CLEO | 0:21b4d8237564 | 81 | _row++; |
SMART_CLEO | 0:21b4d8237564 | 82 | if (_row >= rows()) { |
SMART_CLEO | 0:21b4d8237564 | 83 | _row = 0; |
SMART_CLEO | 0:21b4d8237564 | 84 | } |
SMART_CLEO | 0:21b4d8237564 | 85 | } |
SMART_CLEO | 0:21b4d8237564 | 86 | } |
SMART_CLEO | 0:21b4d8237564 | 87 | return value; |
SMART_CLEO | 0:21b4d8237564 | 88 | } |
SMART_CLEO | 0:21b4d8237564 | 89 | |
SMART_CLEO | 0:21b4d8237564 | 90 | int TextLCD::_getc() { |
SMART_CLEO | 0:21b4d8237564 | 91 | return -1; |
SMART_CLEO | 0:21b4d8237564 | 92 | } |
SMART_CLEO | 0:21b4d8237564 | 93 | |
SMART_CLEO | 0:21b4d8237564 | 94 | void TextLCD::writeByte(int value) { |
SMART_CLEO | 0:21b4d8237564 | 95 | _rw = 0; |
SMART_CLEO | 0:21b4d8237564 | 96 | |
SMART_CLEO | 0:21b4d8237564 | 97 | _d = value >> 4; |
SMART_CLEO | 0:21b4d8237564 | 98 | wait(0.000040f); // most instructions take 40us |
SMART_CLEO | 0:21b4d8237564 | 99 | _e = 0; |
SMART_CLEO | 0:21b4d8237564 | 100 | wait(0.000040f); |
SMART_CLEO | 0:21b4d8237564 | 101 | _e = 1; |
SMART_CLEO | 0:21b4d8237564 | 102 | _d = value >> 0; |
SMART_CLEO | 0:21b4d8237564 | 103 | wait(0.000040f); |
SMART_CLEO | 0:21b4d8237564 | 104 | _e = 0; |
SMART_CLEO | 0:21b4d8237564 | 105 | wait(0.000040f); // most instructions take 40us |
SMART_CLEO | 0:21b4d8237564 | 106 | _e = 1; |
SMART_CLEO | 0:21b4d8237564 | 107 | } |
SMART_CLEO | 0:21b4d8237564 | 108 | |
SMART_CLEO | 0:21b4d8237564 | 109 | void TextLCD::writeCommand(int command) { |
SMART_CLEO | 0:21b4d8237564 | 110 | _rs = 0; |
SMART_CLEO | 0:21b4d8237564 | 111 | writeByte(command); |
SMART_CLEO | 0:21b4d8237564 | 112 | } |
SMART_CLEO | 0:21b4d8237564 | 113 | |
SMART_CLEO | 0:21b4d8237564 | 114 | void TextLCD::writeData(int data) { |
SMART_CLEO | 0:21b4d8237564 | 115 | _rs = 1; |
SMART_CLEO | 0:21b4d8237564 | 116 | writeByte(data); |
SMART_CLEO | 0:21b4d8237564 | 117 | } |
SMART_CLEO | 0:21b4d8237564 | 118 | |
SMART_CLEO | 0:21b4d8237564 | 119 | int TextLCD::address(int column, int row) { |
SMART_CLEO | 0:21b4d8237564 | 120 | switch (_type) { |
SMART_CLEO | 0:21b4d8237564 | 121 | case LCD20x4: |
SMART_CLEO | 0:21b4d8237564 | 122 | switch (row) { |
SMART_CLEO | 0:21b4d8237564 | 123 | case 0: |
SMART_CLEO | 0:21b4d8237564 | 124 | return 0x80 + column; |
SMART_CLEO | 0:21b4d8237564 | 125 | case 1: |
SMART_CLEO | 0:21b4d8237564 | 126 | return 0xc0 + column; |
SMART_CLEO | 0:21b4d8237564 | 127 | case 2: |
SMART_CLEO | 0:21b4d8237564 | 128 | return 0x94 + column; |
SMART_CLEO | 0:21b4d8237564 | 129 | case 3: |
SMART_CLEO | 0:21b4d8237564 | 130 | return 0xd4 + column; |
SMART_CLEO | 0:21b4d8237564 | 131 | } |
SMART_CLEO | 0:21b4d8237564 | 132 | case LCD16x2B: |
SMART_CLEO | 0:21b4d8237564 | 133 | return 0x80 + (row * 40) + column; |
SMART_CLEO | 0:21b4d8237564 | 134 | case LCD16x2: |
SMART_CLEO | 0:21b4d8237564 | 135 | case LCD20x2: |
SMART_CLEO | 0:21b4d8237564 | 136 | default: |
SMART_CLEO | 0:21b4d8237564 | 137 | return 0x80 + (row * 0x40) + column; |
SMART_CLEO | 0:21b4d8237564 | 138 | } |
SMART_CLEO | 0:21b4d8237564 | 139 | } |
SMART_CLEO | 0:21b4d8237564 | 140 | |
SMART_CLEO | 0:21b4d8237564 | 141 | int TextLCD::columns() { |
SMART_CLEO | 0:21b4d8237564 | 142 | switch (_type) { |
SMART_CLEO | 0:21b4d8237564 | 143 | case LCD20x4: |
SMART_CLEO | 0:21b4d8237564 | 144 | case LCD20x2: |
SMART_CLEO | 0:21b4d8237564 | 145 | return 20; |
SMART_CLEO | 0:21b4d8237564 | 146 | case LCD16x2: |
SMART_CLEO | 0:21b4d8237564 | 147 | case LCD16x2B: |
SMART_CLEO | 0:21b4d8237564 | 148 | default: |
SMART_CLEO | 0:21b4d8237564 | 149 | return 16; |
SMART_CLEO | 0:21b4d8237564 | 150 | } |
SMART_CLEO | 0:21b4d8237564 | 151 | } |
SMART_CLEO | 0:21b4d8237564 | 152 | |
SMART_CLEO | 0:21b4d8237564 | 153 | int TextLCD::rows() { |
SMART_CLEO | 0:21b4d8237564 | 154 | switch (_type) { |
SMART_CLEO | 0:21b4d8237564 | 155 | case LCD20x4: |
SMART_CLEO | 0:21b4d8237564 | 156 | return 4; |
SMART_CLEO | 0:21b4d8237564 | 157 | case LCD16x2: |
SMART_CLEO | 0:21b4d8237564 | 158 | case LCD16x2B: |
SMART_CLEO | 0:21b4d8237564 | 159 | case LCD20x2: |
SMART_CLEO | 0:21b4d8237564 | 160 | default: |
SMART_CLEO | 0:21b4d8237564 | 161 | return 2; |
SMART_CLEO | 0:21b4d8237564 | 162 | } |
SMART_CLEO | 0:21b4d8237564 | 163 | } |