Takeuchi Kouichi / Mbed 2 deprecated 2ck0705_mbed CW09

エレキジャックweb mbed入門 mbed CWデコーダ課題9です。英数字に加えて、和文にスイッチで切り替えることで対応します。デコーダ基板が必要です

Dependencies:   mbed

TextLCD0420.cpp@0:4a234ad277bf, 2012-07-16 (annotated)

Committer:
takeuchi
Date:
Mon Jul 16 02:33:03 2012 +0000
Revision:
0:4a234ad277bf
???????web mbed?? mbed CW??????8??????????????????BT?AR??????????????????????????

Who changed what in which revision?

UserRevisionLine numberNew contents of line
takeuchi 0:4a234ad277bf 1 /* mbed TextLCD Library
takeuchi 0:4a234ad277bf 2 * Copyright (c) 2007-2009 sford
takeuchi 0:4a234ad277bf 3 * Released under the MIT License: http://mbed.org/license/mit
takeuchi 0:4a234ad277bf 4 */
takeuchi 0:4a234ad277bf 5 // for 04row*20line LCD
takeuchi 0:4a234ad277bf 6
takeuchi 0:4a234ad277bf 7 #include "TextLCD0420.h"
takeuchi 0:4a234ad277bf 8
takeuchi 0:4a234ad277bf 9 #include "mbed.h"
takeuchi 0:4a234ad277bf 10 #include "error.h"
takeuchi 0:4a234ad277bf 11
takeuchi 0:4a234ad277bf 12 using namespace mbed;
takeuchi 0:4a234ad277bf 13
takeuchi 0:4a234ad277bf 14 /*
takeuchi 0:4a234ad277bf 15 * useful info found at http://www.a-netz.de/lcd.en.php
takeuchi 0:4a234ad277bf 16 *
takeuchi 0:4a234ad277bf 17 *
takeuchi 0:4a234ad277bf 18 * Initialisation
takeuchi 0:4a234ad277bf 19 * ==============
takeuchi 0:4a234ad277bf 20 *
takeuchi 0:4a234ad277bf 21 * After attaching the supply voltage/after a reset, the display needs to be brought in to a defined state
takeuchi 0:4a234ad277bf 22 *
takeuchi 0:4a234ad277bf 23 * - wait approximately 15 ms so the display is ready to execute commands
takeuchi 0:4a234ad277bf 24 * - Execute the command 0x30 ("Display Settings") three times (wait 1,64ms after each command, the busy flag cannot be queried now).
takeuchi 0:4a234ad277bf 25 * - The display is in 8 bit mode, so if you have only connected 4 data pins you should only transmit the higher nibble of each command.
takeuchi 0:4a234ad277bf 26 * - If you want to use the 4 bit mode, now you can execute the command to switch over to this mode now.
takeuchi 0:4a234ad277bf 27 * - Execute the "clear display" command
takeuchi 0:4a234ad277bf 28 *
takeuchi 0:4a234ad277bf 29 * Timing
takeuchi 0:4a234ad277bf 30 * ======
takeuchi 0:4a234ad277bf 31 *
takeuchi 0:4a234ad277bf 32 * Nearly all commands transmitted to the display need 40us for execution.
takeuchi 0:4a234ad277bf 33 * Exceptions are the commands "Clear Display and Reset" and "Set Cursor to Start Position"
takeuchi 0:4a234ad277bf 34 * These commands need 1.64ms for execution. These timings are valid for all displays working with an
takeuchi 0:4a234ad277bf 35 * internal clock of 250kHz. But I do not know any displays that use other frequencies. Any time you
takeuchi 0:4a234ad277bf 36 * can use the busy flag to test if the display is ready to accept the next command.
takeuchi 0:4a234ad277bf 37 *
takeuchi 0:4a234ad277bf 38 * _e is kept high apart from calling clock
takeuchi 0:4a234ad277bf 39 * _rw is kept 0 (write) apart from actions that uyse it differently
takeuchi 0:4a234ad277bf 40 * _rs is set by the data/command writes
takeuchi 0:4a234ad277bf 41 */
takeuchi 0:4a234ad277bf 42
takeuchi 0:4a234ad277bf 43 TextLCD::TextLCD(PinName rs, PinName rw, PinName e, PinName d0, PinName d1,
takeuchi 0:4a234ad277bf 44 PinName d2, PinName d3, int columns, int rows) : _rw(rw), _rs(rs),
takeuchi 0:4a234ad277bf 45 _e(e), _d(d0, d1, d2, d3), _columns(columns), _rows(rows) {
takeuchi 0:4a234ad277bf 46
takeuchi 0:4a234ad277bf 47
takeuchi 0:4a234ad277bf 48 // Mon, 27 Apr 2009 23:32:34 +0200
takeuchi 0:4a234ad277bf 49 // Kevin Konradt:
takeuchi 0:4a234ad277bf 50 // When using a LCD with 1 row x 16 characters
takeuchi 0:4a234ad277bf 51 // instead of 2x16, try changing _columns to 8.
takeuchi 0:4a234ad277bf 52 // (display seems to split the 16 characters into
takeuchi 0:4a234ad277bf 53 // 2 virtual rows with 8 characters each.)
takeuchi 0:4a234ad277bf 54
takeuchi 0:4a234ad277bf 55 _rw = 0;
takeuchi 0:4a234ad277bf 56 _e = 1;
takeuchi 0:4a234ad277bf 57 _rs = 0; // command mode
takeuchi 0:4a234ad277bf 58
takeuchi 0:4a234ad277bf 59 // Should theoretically wait 15ms, but most things will be powered up pre-reset
takeuchi 0:4a234ad277bf 60 // so i'll disable that for the minute. If implemented, could wait 15ms post reset
takeuchi 0:4a234ad277bf 61 // instead
takeuchi 0:4a234ad277bf 62 // wait(0.015);
takeuchi 0:4a234ad277bf 63
takeuchi 0:4a234ad277bf 64 // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus)
takeuchi 0:4a234ad277bf 65 for(int i=0; i<3; i++) {
takeuchi 0:4a234ad277bf 66 writeNibble(0x3);
takeuchi 0:4a234ad277bf 67 wait(0.00164); // this command takes 1.64ms, so wait for it
takeuchi 0:4a234ad277bf 68 }
takeuchi 0:4a234ad277bf 69 writeNibble(0x2); // 4-bit mode
takeuchi 0:4a234ad277bf 70
takeuchi 0:4a234ad277bf 71 writeCommand(0x28); // Function set 001 BW N F - -
takeuchi 0:4a234ad277bf 72 writeCommand(0x0C);
takeuchi 0:4a234ad277bf 73 writeCommand(0x6); // Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes
takeuchi 0:4a234ad277bf 74
takeuchi 0:4a234ad277bf 75 cls();
takeuchi 0:4a234ad277bf 76 }
takeuchi 0:4a234ad277bf 77
takeuchi 0:4a234ad277bf 78 int TextLCD::_putc(int value) {
takeuchi 0:4a234ad277bf 79 if(value == '\n') {
takeuchi 0:4a234ad277bf 80 newline();
takeuchi 0:4a234ad277bf 81 } else {
takeuchi 0:4a234ad277bf 82 writeData(value);
takeuchi 0:4a234ad277bf 83 }
takeuchi 0:4a234ad277bf 84 return value;
takeuchi 0:4a234ad277bf 85 }
takeuchi 0:4a234ad277bf 86
takeuchi 0:4a234ad277bf 87 int TextLCD::_getc() {
takeuchi 0:4a234ad277bf 88 return 0;
takeuchi 0:4a234ad277bf 89 }
takeuchi 0:4a234ad277bf 90
takeuchi 0:4a234ad277bf 91 void TextLCD::newline() {
takeuchi 0:4a234ad277bf 92 _column = 0;
takeuchi 0:4a234ad277bf 93 _row++;
takeuchi 0:4a234ad277bf 94 if(_row >= _rows) {
takeuchi 0:4a234ad277bf 95 _row = 0;
takeuchi 0:4a234ad277bf 96 }
takeuchi 0:4a234ad277bf 97 locate(_column, _row);
takeuchi 0:4a234ad277bf 98 }
takeuchi 0:4a234ad277bf 99
takeuchi 0:4a234ad277bf 100 void TextLCD::locate(int column, int row) {
takeuchi 0:4a234ad277bf 101 int address;
takeuchi 0:4a234ad277bf 102 if(column < 0 || column >= _columns || row < 0 || row >= _rows) {
takeuchi 0:4a234ad277bf 103 error("locate(%d,%d) out of range on %dx%d display", column, row, _columns, _rows);
takeuchi 0:4a234ad277bf 104 return;
takeuchi 0:4a234ad277bf 105 }
takeuchi 0:4a234ad277bf 106
takeuchi 0:4a234ad277bf 107 _row = row;
takeuchi 0:4a234ad277bf 108 _column = column;
takeuchi 0:4a234ad277bf 109 // 02*20 => int address = 0x80 + (_row * 40) + _column; // memory starts at 0x80, and is 40 chars long per row
takeuchi 0:4a234ad277bf 110
takeuchi 0:4a234ad277bf 111
takeuchi 0:4a234ad277bf 112 if(_row == 0 ){
takeuchi 0:4a234ad277bf 113 address = 0x80+_column;
takeuchi 0:4a234ad277bf 114 }
takeuchi 0:4a234ad277bf 115 else if(_row == 1 ){
takeuchi 0:4a234ad277bf 116 address = 0x80+ (0x40) + _column;
takeuchi 0:4a234ad277bf 117 }
takeuchi 0:4a234ad277bf 118 else if(_row == 2){
takeuchi 0:4a234ad277bf 119 address = 0x80+(0x14)+_column;
takeuchi 0:4a234ad277bf 120 }
takeuchi 0:4a234ad277bf 121 else if(_row == 3){
takeuchi 0:4a234ad277bf 122 address = 0x80+(0x54)+_column;
takeuchi 0:4a234ad277bf 123 }
takeuchi 0:4a234ad277bf 124
takeuchi 0:4a234ad277bf 125 writeCommand(address);
takeuchi 0:4a234ad277bf 126 }
takeuchi 0:4a234ad277bf 127
takeuchi 0:4a234ad277bf 128 void TextLCD::cls() {
takeuchi 0:4a234ad277bf 129 writeCommand(0x01); // Clear Display
takeuchi 0:4a234ad277bf 130 wait(0.00164f); // This command takes 1.64 ms
takeuchi 0:4a234ad277bf 131 locate(0, 0);
takeuchi 0:4a234ad277bf 132 }
takeuchi 0:4a234ad277bf 133
takeuchi 0:4a234ad277bf 134 void TextLCD::reset() {
takeuchi 0:4a234ad277bf 135 cls();
takeuchi 0:4a234ad277bf 136 }
takeuchi 0:4a234ad277bf 137
takeuchi 0:4a234ad277bf 138 void TextLCD::clock() {
takeuchi 0:4a234ad277bf 139 wait(0.000040f);
takeuchi 0:4a234ad277bf 140 _e = 0;
takeuchi 0:4a234ad277bf 141 wait(0.000040f); // most instructions take 40us
takeuchi 0:4a234ad277bf 142 _e = 1;
takeuchi 0:4a234ad277bf 143 }
takeuchi 0:4a234ad277bf 144
takeuchi 0:4a234ad277bf 145 void TextLCD::writeNibble(int value) {
takeuchi 0:4a234ad277bf 146 _d = value;
takeuchi 0:4a234ad277bf 147 clock();
takeuchi 0:4a234ad277bf 148 }
takeuchi 0:4a234ad277bf 149
takeuchi 0:4a234ad277bf 150 void TextLCD::writeByte(int value) {
takeuchi 0:4a234ad277bf 151 writeNibble(value >> 4);
takeuchi 0:4a234ad277bf 152 writeNibble(value >> 0);
takeuchi 0:4a234ad277bf 153 }
takeuchi 0:4a234ad277bf 154
takeuchi 0:4a234ad277bf 155 void TextLCD::writeCommand(int command) {
takeuchi 0:4a234ad277bf 156 _rs = 0;
takeuchi 0:4a234ad277bf 157 writeByte(command);
takeuchi 0:4a234ad277bf 158 }
takeuchi 0:4a234ad277bf 159
takeuchi 0:4a234ad277bf 160 void TextLCD::writeData(int data) {
takeuchi 0:4a234ad277bf 161 _rs = 1;
takeuchi 0:4a234ad277bf 162 writeByte(data);
takeuchi 0:4a234ad277bf 163 _column++;
takeuchi 0:4a234ad277bf 164 if(_column >= _columns) {
takeuchi 0:4a234ad277bf 165 newline();
takeuchi 0:4a234ad277bf 166 }
takeuchi 0:4a234ad277bf 167 }