Takeuchi Kouichi / Mbed 2 deprecated 2ck0706_mbed　CWd_Ver1

エレキジャックweb mbed入門 mbed CWデコーダ 完成形です。CWd Ver1.0とします。細かなバグを修正してあります。デコーダ基板が必要です。

Dependencies:   mbed

TextLCD0420.cpp@0:3e0f52f529fc, 2012-07-16 (annotated)

Committer:
takeuchi
Date:
Mon Jul 16 06:34:02 2012 +0000
Revision:
0:3e0f52f529fc
???????web mbed?? mbed CW??????12???CQ????????????????????????????????????????????????

Who changed what in which revision?

UserRevisionLine numberNew contents of line
takeuchi 0:3e0f52f529fc 1 /* mbed TextLCD Library
takeuchi 0:3e0f52f529fc 2 * Copyright (c) 2007-2009 sford
takeuchi 0:3e0f52f529fc 3 * Released under the MIT License: http://mbed.org/license/mit
takeuchi 0:3e0f52f529fc 4 */
takeuchi 0:3e0f52f529fc 5 // for 04row*20line LCD
takeuchi 0:3e0f52f529fc 6
takeuchi 0:3e0f52f529fc 7 #include "TextLCD0420.h"
takeuchi 0:3e0f52f529fc 8
takeuchi 0:3e0f52f529fc 9 #include "mbed.h"
takeuchi 0:3e0f52f529fc 10 #include "error.h"
takeuchi 0:3e0f52f529fc 11
takeuchi 0:3e0f52f529fc 12 using namespace mbed;
takeuchi 0:3e0f52f529fc 13
takeuchi 0:3e0f52f529fc 14 /*
takeuchi 0:3e0f52f529fc 15 * useful info found at http://www.a-netz.de/lcd.en.php
takeuchi 0:3e0f52f529fc 16 *
takeuchi 0:3e0f52f529fc 17 *
takeuchi 0:3e0f52f529fc 18 * Initialisation
takeuchi 0:3e0f52f529fc 19 * ==============
takeuchi 0:3e0f52f529fc 20 *
takeuchi 0:3e0f52f529fc 21 * After attaching the supply voltage/after a reset, the display needs to be brought in to a defined state
takeuchi 0:3e0f52f529fc 22 *
takeuchi 0:3e0f52f529fc 23 * - wait approximately 15 ms so the display is ready to execute commands
takeuchi 0:3e0f52f529fc 24 * - Execute the command 0x30 ("Display Settings") three times (wait 1,64ms after each command, the busy flag cannot be queried now).
takeuchi 0:3e0f52f529fc 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 0:3e0f52f529fc 26 * - If you want to use the 4 bit mode, now you can execute the command to switch over to this mode now.
takeuchi 0:3e0f52f529fc 27 * - Execute the "clear display" command
takeuchi 0:3e0f52f529fc 28 *
takeuchi 0:3e0f52f529fc 29 * Timing
takeuchi 0:3e0f52f529fc 30 * ======
takeuchi 0:3e0f52f529fc 31 *
takeuchi 0:3e0f52f529fc 32 * Nearly all commands transmitted to the display need 40us for execution.
takeuchi 0:3e0f52f529fc 33 * Exceptions are the commands "Clear Display and Reset" and "Set Cursor to Start Position"
takeuchi 0:3e0f52f529fc 34 * These commands need 1.64ms for execution. These timings are valid for all displays working with an
takeuchi 0:3e0f52f529fc 35 * internal clock of 250kHz. But I do not know any displays that use other frequencies. Any time you
takeuchi 0:3e0f52f529fc 36 * can use the busy flag to test if the display is ready to accept the next command.
takeuchi 0:3e0f52f529fc 37 *
takeuchi 0:3e0f52f529fc 38 * _e is kept high apart from calling clock
takeuchi 0:3e0f52f529fc 39 * _rw is kept 0 (write) apart from actions that uyse it differently
takeuchi 0:3e0f52f529fc 40 * _rs is set by the data/command writes
takeuchi 0:3e0f52f529fc 41 */
takeuchi 0:3e0f52f529fc 42
takeuchi 0:3e0f52f529fc 43 TextLCD::TextLCD(PinName rs, PinName rw, PinName e, PinName d0, PinName d1,
takeuchi 0:3e0f52f529fc 44 PinName d2, PinName d3, int columns, int rows) : _rw(rw), _rs(rs),
takeuchi 0:3e0f52f529fc 45 _e(e), _d(d0, d1, d2, d3), _columns(columns), _rows(rows) {
takeuchi 0:3e0f52f529fc 46
takeuchi 0:3e0f52f529fc 47
takeuchi 0:3e0f52f529fc 48 // Mon, 27 Apr 2009 23:32:34 +0200
takeuchi 0:3e0f52f529fc 49 // Kevin Konradt:
takeuchi 0:3e0f52f529fc 50 // When using a LCD with 1 row x 16 characters
takeuchi 0:3e0f52f529fc 51 // instead of 2x16, try changing _columns to 8.
takeuchi 0:3e0f52f529fc 52 // (display seems to split the 16 characters into
takeuchi 0:3e0f52f529fc 53 // 2 virtual rows with 8 characters each.)
takeuchi 0:3e0f52f529fc 54
takeuchi 0:3e0f52f529fc 55 _rw = 0;
takeuchi 0:3e0f52f529fc 56 _e = 1;
takeuchi 0:3e0f52f529fc 57 _rs = 0; // command mode
takeuchi 0:3e0f52f529fc 58
takeuchi 0:3e0f52f529fc 59 // Should theoretically wait 15ms, but most things will be powered up pre-reset
takeuchi 0:3e0f52f529fc 60 // so i'll disable that for the minute. If implemented, could wait 15ms post reset
takeuchi 0:3e0f52f529fc 61 // instead
takeuchi 0:3e0f52f529fc 62 // wait(0.015);
takeuchi 0:3e0f52f529fc 63
takeuchi 0:3e0f52f529fc 64 // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus)
takeuchi 0:3e0f52f529fc 65 for(int i=0; i<3; i++) {
takeuchi 0:3e0f52f529fc 66 writeNibble(0x3);
takeuchi 0:3e0f52f529fc 67 wait(0.00164); // this command takes 1.64ms, so wait for it
takeuchi 0:3e0f52f529fc 68 }
takeuchi 0:3e0f52f529fc 69 writeNibble(0x2); // 4-bit mode
takeuchi 0:3e0f52f529fc 70
takeuchi 0:3e0f52f529fc 71 writeCommand(0x28); // Function set 001 BW N F - -
takeuchi 0:3e0f52f529fc 72 writeCommand(0x0C);
takeuchi 0:3e0f52f529fc 73 writeCommand(0x6); // Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes
takeuchi 0:3e0f52f529fc 74
takeuchi 0:3e0f52f529fc 75 cls();
takeuchi 0:3e0f52f529fc 76 }
takeuchi 0:3e0f52f529fc 77
takeuchi 0:3e0f52f529fc 78 int TextLCD::_putc(int value) {
takeuchi 0:3e0f52f529fc 79 if(value == '\n') {
takeuchi 0:3e0f52f529fc 80 newline();
takeuchi 0:3e0f52f529fc 81 } else {
takeuchi 0:3e0f52f529fc 82 writeData(value);
takeuchi 0:3e0f52f529fc 83 }
takeuchi 0:3e0f52f529fc 84 return value;
takeuchi 0:3e0f52f529fc 85 }
takeuchi 0:3e0f52f529fc 86
takeuchi 0:3e0f52f529fc 87 int TextLCD::_getc() {
takeuchi 0:3e0f52f529fc 88 return 0;
takeuchi 0:3e0f52f529fc 89 }
takeuchi 0:3e0f52f529fc 90
takeuchi 0:3e0f52f529fc 91 void TextLCD::newline() {
takeuchi 0:3e0f52f529fc 92 _column = 0;
takeuchi 0:3e0f52f529fc 93 _row++;
takeuchi 0:3e0f52f529fc 94 if(_row >= _rows) {
takeuchi 0:3e0f52f529fc 95 _row = 0;
takeuchi 0:3e0f52f529fc 96 }
takeuchi 0:3e0f52f529fc 97 locate(_column, _row);
takeuchi 0:3e0f52f529fc 98 }
takeuchi 0:3e0f52f529fc 99
takeuchi 0:3e0f52f529fc 100 void TextLCD::locate(int column, int row) {
takeuchi 0:3e0f52f529fc 101 int address;
takeuchi 0:3e0f52f529fc 102 if(column < 0 || column >= _columns || row < 0 || row >= _rows) {
takeuchi 0:3e0f52f529fc 103 error("locate(%d,%d) out of range on %dx%d display", column, row, _columns, _rows);
takeuchi 0:3e0f52f529fc 104 return;
takeuchi 0:3e0f52f529fc 105 }
takeuchi 0:3e0f52f529fc 106
takeuchi 0:3e0f52f529fc 107 _row = row;
takeuchi 0:3e0f52f529fc 108 _column = column;
takeuchi 0:3e0f52f529fc 109 // 02*20 => int address = 0x80 + (_row * 40) + _column; // memory starts at 0x80, and is 40 chars long per row
takeuchi 0:3e0f52f529fc 110
takeuchi 0:3e0f52f529fc 111
takeuchi 0:3e0f52f529fc 112 if(_row == 0 ){
takeuchi 0:3e0f52f529fc 113 address = 0x80+_column;
takeuchi 0:3e0f52f529fc 114 }
takeuchi 0:3e0f52f529fc 115 else if(_row == 1 ){
takeuchi 0:3e0f52f529fc 116 address = 0x80+ (0x40) + _column;
takeuchi 0:3e0f52f529fc 117 }
takeuchi 0:3e0f52f529fc 118 else if(_row == 2){
takeuchi 0:3e0f52f529fc 119 address = 0x80+(0x14)+_column;
takeuchi 0:3e0f52f529fc 120 }
takeuchi 0:3e0f52f529fc 121 else if(_row == 3){
takeuchi 0:3e0f52f529fc 122 address = 0x80+(0x54)+_column;
takeuchi 0:3e0f52f529fc 123 }
takeuchi 0:3e0f52f529fc 124
takeuchi 0:3e0f52f529fc 125 writeCommand(address);
takeuchi 0:3e0f52f529fc 126 }
takeuchi 0:3e0f52f529fc 127
takeuchi 0:3e0f52f529fc 128 void TextLCD::cls() {
takeuchi 0:3e0f52f529fc 129 writeCommand(0x01); // Clear Display
takeuchi 0:3e0f52f529fc 130 wait(0.00164f); // This command takes 1.64 ms
takeuchi 0:3e0f52f529fc 131 locate(0, 0);
takeuchi 0:3e0f52f529fc 132 }
takeuchi 0:3e0f52f529fc 133
takeuchi 0:3e0f52f529fc 134 void TextLCD::reset() {
takeuchi 0:3e0f52f529fc 135 cls();
takeuchi 0:3e0f52f529fc 136 }
takeuchi 0:3e0f52f529fc 137
takeuchi 0:3e0f52f529fc 138 void TextLCD::clock() {
takeuchi 0:3e0f52f529fc 139 wait(0.000040f);
takeuchi 0:3e0f52f529fc 140 _e = 0;
takeuchi 0:3e0f52f529fc 141 wait(0.000040f); // most instructions take 40us
takeuchi 0:3e0f52f529fc 142 _e = 1;
takeuchi 0:3e0f52f529fc 143 }
takeuchi 0:3e0f52f529fc 144
takeuchi 0:3e0f52f529fc 145 void TextLCD::writeNibble(int value) {
takeuchi 0:3e0f52f529fc 146 _d = value;
takeuchi 0:3e0f52f529fc 147 clock();
takeuchi 0:3e0f52f529fc 148 }
takeuchi 0:3e0f52f529fc 149
takeuchi 0:3e0f52f529fc 150 void TextLCD::writeByte(int value) {
takeuchi 0:3e0f52f529fc 151 writeNibble(value >> 4);
takeuchi 0:3e0f52f529fc 152 writeNibble(value >> 0);
takeuchi 0:3e0f52f529fc 153 }
takeuchi 0:3e0f52f529fc 154
takeuchi 0:3e0f52f529fc 155 void TextLCD::writeCommand(int command) {
takeuchi 0:3e0f52f529fc 156 _rs = 0;
takeuchi 0:3e0f52f529fc 157 writeByte(command);
takeuchi 0:3e0f52f529fc 158 }
takeuchi 0:3e0f52f529fc 159
takeuchi 0:3e0f52f529fc 160 void TextLCD::writeData(int data) {
takeuchi 0:3e0f52f529fc 161 _rs = 1;
takeuchi 0:3e0f52f529fc 162 writeByte(data);
takeuchi 0:3e0f52f529fc 163 _column++;
takeuchi 0:3e0f52f529fc 164 if(_column >= _columns) {
takeuchi 0:3e0f52f529fc 165 newline();
takeuchi 0:3e0f52f529fc 166 }
takeuchi 0:3e0f52f529fc 167 }