Takeuchi Kouichi
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2ck0705_mbed CW11
エレキジャックweb mbed入門 mbed CWデコーダ課題11です。”ホレ””ラタ”による自動切り替えに加えて(QTH)のような一時切り替えに対応します。デコーダ基板が必要です。
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TextLCD0420.cpp
00001 /* mbed TextLCD Library 00002 * Copyright (c) 2007-2009 sford 00003 * Released under the MIT License: http://mbed.org/license/mit 00004 */ 00005 // for 04row*20line LCD 00006 00007 #include "TextLCD0420.h" 00008 00009 #include "mbed.h" 00010 #include "error.h" 00011 00012 using namespace mbed; 00013 00014 /* 00015 * useful info found at http://www.a-netz.de/lcd.en.php 00016 * 00017 * 00018 * Initialisation 00019 * ============== 00020 * 00021 * After attaching the supply voltage/after a reset, the display needs to be brought in to a defined state 00022 * 00023 * - wait approximately 15 ms so the display is ready to execute commands 00024 * - Execute the command 0x30 ("Display Settings") three times (wait 1,64ms after each command, the busy flag cannot be queried now). 00025 * - 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. 00026 * - If you want to use the 4 bit mode, now you can execute the command to switch over to this mode now. 00027 * - Execute the "clear display" command 00028 * 00029 * Timing 00030 * ====== 00031 * 00032 * Nearly all commands transmitted to the display need 40us for execution. 00033 * Exceptions are the commands "Clear Display and Reset" and "Set Cursor to Start Position" 00034 * These commands need 1.64ms for execution. These timings are valid for all displays working with an 00035 * internal clock of 250kHz. But I do not know any displays that use other frequencies. Any time you 00036 * can use the busy flag to test if the display is ready to accept the next command. 00037 * 00038 * _e is kept high apart from calling clock 00039 * _rw is kept 0 (write) apart from actions that uyse it differently 00040 * _rs is set by the data/command writes 00041 */ 00042 00043 TextLCD::TextLCD(PinName rs, PinName rw, PinName e, PinName d0, PinName d1, 00044 PinName d2, PinName d3, int columns, int rows) : _rw(rw), _rs(rs), 00045 _e(e), _d(d0, d1, d2, d3), _columns(columns), _rows(rows) { 00046 00047 00048 // Mon, 27 Apr 2009 23:32:34 +0200 00049 // Kevin Konradt: 00050 // When using a LCD with 1 row x 16 characters 00051 // instead of 2x16, try changing _columns to 8. 00052 // (display seems to split the 16 characters into 00053 // 2 virtual rows with 8 characters each.) 00054 00055 _rw = 0; 00056 _e = 1; 00057 _rs = 0; // command mode 00058 00059 // Should theoretically wait 15ms, but most things will be powered up pre-reset 00060 // so i'll disable that for the minute. If implemented, could wait 15ms post reset 00061 // instead 00062 // wait(0.015); 00063 00064 // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus) 00065 for(int i=0; i<3; i++) { 00066 writeNibble(0x3); 00067 wait(0.00164); // this command takes 1.64ms, so wait for it 00068 } 00069 writeNibble(0x2); // 4-bit mode 00070 00071 writeCommand(0x28); // Function set 001 BW N F - - 00072 writeCommand(0x0C); 00073 writeCommand(0x6); // Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes 00074 00075 cls(); 00076 } 00077 00078 int TextLCD::_putc(int value) { 00079 if(value == '\n') { 00080 newline(); 00081 } else { 00082 writeData(value); 00083 } 00084 return value; 00085 } 00086 00087 int TextLCD::_getc() { 00088 return 0; 00089 } 00090 00091 void TextLCD::newline() { 00092 _column = 0; 00093 _row++; 00094 if(_row >= _rows) { 00095 _row = 0; 00096 } 00097 locate(_column, _row); 00098 } 00099 00100 void TextLCD::locate(int column, int row) { 00101 int address; 00102 if(column < 0 || column >= _columns || row < 0 || row >= _rows) { 00103 error("locate(%d,%d) out of range on %dx%d display", column, row, _columns, _rows); 00104 return; 00105 } 00106 00107 _row = row; 00108 _column = column; 00109 // 02*20 => int address = 0x80 + (_row * 40) + _column; // memory starts at 0x80, and is 40 chars long per row 00110 00111 00112 if(_row == 0 ){ 00113 address = 0x80+_column; 00114 } 00115 else if(_row == 1 ){ 00116 address = 0x80+ (0x40) + _column; 00117 } 00118 else if(_row == 2){ 00119 address = 0x80+(0x14)+_column; 00120 } 00121 else if(_row == 3){ 00122 address = 0x80+(0x54)+_column; 00123 } 00124 00125 writeCommand(address); 00126 } 00127 00128 void TextLCD::cls() { 00129 writeCommand(0x01); // Clear Display 00130 wait(0.00164f); // This command takes 1.64 ms 00131 locate(0, 0); 00132 } 00133 00134 void TextLCD::reset() { 00135 cls(); 00136 } 00137 00138 void TextLCD::clock() { 00139 wait(0.000040f); 00140 _e = 0; 00141 wait(0.000040f); // most instructions take 40us 00142 _e = 1; 00143 } 00144 00145 void TextLCD::writeNibble(int value) { 00146 _d = value; 00147 clock(); 00148 } 00149 00150 void TextLCD::writeByte(int value) { 00151 writeNibble(value >> 4); 00152 writeNibble(value >> 0); 00153 } 00154 00155 void TextLCD::writeCommand(int command) { 00156 _rs = 0; 00157 writeByte(command); 00158 } 00159 00160 void TextLCD::writeData(int data) { 00161 _rs = 1; 00162 writeByte(data); 00163 _column++; 00164 if(_column >= _columns) { 00165 newline(); 00166 } 00167 }
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