Takeuchi Kouichi / Mbed 2 deprecated 2ck0122_RMCS10

エレキジャックweb mbed入門 mbed RMCS鉄道模型自動制御システム 課題10です。単線ですが、ポイントを一つ設置して2列車を交互運転できるレイアウトです3アクティブ光センサ、1ポイントを設置しています。コンパクトに小型アルミトランクに組み込みました。

TextLCD0420.cpp@0:f3675b6d19ef, 2012-02-19 (annotated)

Committer:
takeuchi
Date:
Sun Feb 19 07:54:27 2012 +0000
Revision:
0:f3675b6d19ef

        

        
Who changed what in which revision?

        

            
                
UserRevisionLine numberNew contents of line

            
            


takeuchi

0:f3675b6d19ef


     1

/* mbed TextLCD Library





takeuchi

0:f3675b6d19ef


     2

 * Copyright (c) 2007-2009 sford





takeuchi

0:f3675b6d19ef


     3

 * Released under the MIT License: http://mbed.org/license/mit





takeuchi

0:f3675b6d19ef


     4

 */





takeuchi

0:f3675b6d19ef


     5

 // for 04row*20line LCD





takeuchi

0:f3675b6d19ef


     6

 





takeuchi

0:f3675b6d19ef


     7

#include "TextLCD0420.h"





takeuchi

0:f3675b6d19ef


     8







takeuchi

0:f3675b6d19ef


     9

#include "mbed.h"





takeuchi

0:f3675b6d19ef


    10

#include "error.h"





takeuchi

0:f3675b6d19ef


    11







takeuchi

0:f3675b6d19ef


    12

using namespace mbed;





takeuchi

0:f3675b6d19ef


    13







takeuchi

0:f3675b6d19ef


    14

/*





takeuchi

0:f3675b6d19ef


    15

 * useful info found at http://www.a-netz.de/lcd.en.php





takeuchi

0:f3675b6d19ef


    16

 *





takeuchi

0:f3675b6d19ef


    17

 *





takeuchi

0:f3675b6d19ef


    18

 * Initialisation





takeuchi

0:f3675b6d19ef


    19

 * ==============





takeuchi

0:f3675b6d19ef


    20

 *





takeuchi

0:f3675b6d19ef


    21

 * After attaching the supply voltage/after a reset, the display needs to be brought in to a defined state





takeuchi

0:f3675b6d19ef


    22

 *





takeuchi

0:f3675b6d19ef


    23

 * - wait approximately 15 ms so the display is ready to execute commands





takeuchi

0:f3675b6d19ef


    24

 * - Execute the command 0x30 ("Display Settings") three times (wait 1,64ms after each command, the busy flag cannot be queried now). 





takeuchi

0:f3675b6d19ef


    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:f3675b6d19ef


    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:f3675b6d19ef


    27

 * - Execute the "clear display" command





takeuchi

0:f3675b6d19ef


    28

 *





takeuchi

0:f3675b6d19ef


    29

 * Timing





takeuchi

0:f3675b6d19ef


    30

 * ======





takeuchi

0:f3675b6d19ef


    31

 *





takeuchi

0:f3675b6d19ef


    32

 * Nearly all commands transmitted to the display need 40us for execution. 





takeuchi

0:f3675b6d19ef


    33

 * Exceptions are the commands "Clear Display and Reset" and "Set Cursor to Start Position" 





takeuchi

0:f3675b6d19ef


    34

 * These commands need 1.64ms for execution. These timings are valid for all displays working with an 





takeuchi

0:f3675b6d19ef


    35

 * internal clock of 250kHz. But I do not know any displays that use other frequencies. Any time you 





takeuchi

0:f3675b6d19ef


    36

 * can use the busy flag to test if the display is ready to accept the next command.





takeuchi

0:f3675b6d19ef


    37

 * 





takeuchi

0:f3675b6d19ef


    38

 * _e is kept high apart from calling clock





takeuchi

0:f3675b6d19ef


    39

 * _rw is kept 0 (write) apart from actions that uyse it differently





takeuchi

0:f3675b6d19ef


    40

 * _rs is set by the data/command writes





takeuchi

0:f3675b6d19ef


    41

 */





takeuchi

0:f3675b6d19ef


    42







takeuchi

0:f3675b6d19ef


    43

TextLCD::TextLCD(PinName rs, PinName rw, PinName e, PinName d0, PinName d1, 





takeuchi

0:f3675b6d19ef


    44

    PinName d2, PinName d3, int columns, int rows) : _rw(rw), _rs(rs), 





takeuchi

0:f3675b6d19ef


    45

    _e(e), _d(d0, d1, d2, d3), _columns(columns), _rows(rows) {





takeuchi

0:f3675b6d19ef


    46







takeuchi

0:f3675b6d19ef


    47

   





takeuchi

0:f3675b6d19ef


    48

    // Mon, 27 Apr 2009 23:32:34 +0200





takeuchi

0:f3675b6d19ef


    49

    // Kevin Konradt:





takeuchi

0:f3675b6d19ef


    50

    // When using a LCD with 1 row x 16 characters





takeuchi

0:f3675b6d19ef


    51

    // instead of 2x16, try changing _columns to 8.





takeuchi

0:f3675b6d19ef


    52

    // (display seems to split the 16 characters into 





takeuchi

0:f3675b6d19ef


    53

    // 2 virtual rows with 8 characters each.)





takeuchi

0:f3675b6d19ef


    54







takeuchi

0:f3675b6d19ef


    55

    _rw = 0;





takeuchi

0:f3675b6d19ef


    56

    _e  = 1;





takeuchi

0:f3675b6d19ef


    57

    _rs = 0; // command mode





takeuchi

0:f3675b6d19ef


    58







takeuchi

0:f3675b6d19ef


    59

    // Should theoretically wait 15ms, but most things will be powered up pre-reset





takeuchi

0:f3675b6d19ef


    60

    // so i'll disable that for the minute. If implemented, could wait 15ms post reset





takeuchi

0:f3675b6d19ef


    61

    // instead





takeuchi

0:f3675b6d19ef


    62

    // wait(0.015); 





takeuchi

0:f3675b6d19ef


    63

        





takeuchi

0:f3675b6d19ef


    64

    // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus)





takeuchi

0:f3675b6d19ef


    65

    for(int i=0; i<3; i++) {





takeuchi

0:f3675b6d19ef


    66

        writeNibble(0x3);





takeuchi

0:f3675b6d19ef


    67

        wait(0.00164);      // this command takes 1.64ms, so wait for it





takeuchi

0:f3675b6d19ef


    68

    }





takeuchi

0:f3675b6d19ef


    69

    writeNibble(0x2); // 4-bit mode





takeuchi

0:f3675b6d19ef


    70

            





takeuchi

0:f3675b6d19ef


    71

    writeCommand(0x28);    // Function set 001 BW N F - -  





takeuchi

0:f3675b6d19ef


    72

    writeCommand(0x0C);





takeuchi

0:f3675b6d19ef


    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:f3675b6d19ef


    74

    





takeuchi

0:f3675b6d19ef


    75

    cls();





takeuchi

0:f3675b6d19ef


    76

}





takeuchi

0:f3675b6d19ef


    77







takeuchi

0:f3675b6d19ef


    78

int TextLCD::_putc(int value) {





takeuchi

0:f3675b6d19ef


    79

    if(value == '\n') {





takeuchi

0:f3675b6d19ef


    80

        newline();





takeuchi

0:f3675b6d19ef


    81

    } else {





takeuchi

0:f3675b6d19ef


    82

        writeData(value);





takeuchi

0:f3675b6d19ef


    83

    }





takeuchi

0:f3675b6d19ef


    84

    return value;





takeuchi

0:f3675b6d19ef


    85

}





takeuchi

0:f3675b6d19ef


    86







takeuchi

0:f3675b6d19ef


    87

int TextLCD::_getc() {





takeuchi

0:f3675b6d19ef


    88

    return 0;





takeuchi

0:f3675b6d19ef


    89

}





takeuchi

0:f3675b6d19ef


    90







takeuchi

0:f3675b6d19ef


    91

void TextLCD::newline() {





takeuchi

0:f3675b6d19ef


    92

    _column = 0;





takeuchi

0:f3675b6d19ef


    93

    _row++;





takeuchi

0:f3675b6d19ef


    94

    if(_row >= _rows) {





takeuchi

0:f3675b6d19ef


    95

        _row = 0;





takeuchi

0:f3675b6d19ef


    96

    }





takeuchi

0:f3675b6d19ef


    97

    locate(_column, _row); 





takeuchi

0:f3675b6d19ef


    98

}





takeuchi

0:f3675b6d19ef


    99







takeuchi

0:f3675b6d19ef


   100

void TextLCD::locate(int column, int row) {





takeuchi

0:f3675b6d19ef


   101

    int address;





takeuchi

0:f3675b6d19ef


   102

    if(column < 0 || column >= _columns || row < 0 || row >= _rows) {





takeuchi

0:f3675b6d19ef


   103

        error("locate(%d,%d) out of range on %dx%d display", column, row, _columns, _rows);





takeuchi

0:f3675b6d19ef


   104

        return;





takeuchi

0:f3675b6d19ef


   105

    }





takeuchi

0:f3675b6d19ef


   106

    





takeuchi

0:f3675b6d19ef


   107

    _row = row;  





takeuchi

0:f3675b6d19ef


   108

    _column = column;





takeuchi

0:f3675b6d19ef


   109

//  02*20 =>   int address = 0x80 + (_row * 40) + _column; // memory starts at 0x80, and is 40 chars long per row 





takeuchi

0:f3675b6d19ef


   110







takeuchi

0:f3675b6d19ef


   111







takeuchi

0:f3675b6d19ef


   112

      if(_row == 0 ){





takeuchi

0:f3675b6d19ef


   113

        address = 0x80+_column;





takeuchi

0:f3675b6d19ef


   114

      }





takeuchi

0:f3675b6d19ef


   115

      else if(_row == 1 ){





takeuchi

0:f3675b6d19ef


   116

        address = 0x80+ (0x40) + _column;





takeuchi

0:f3675b6d19ef


   117

      }





takeuchi

0:f3675b6d19ef


   118

      else if(_row == 2){





takeuchi

0:f3675b6d19ef


   119

        address = 0x80+(0x14)+_column;





takeuchi

0:f3675b6d19ef


   120

      }





takeuchi

0:f3675b6d19ef


   121

      else if(_row == 3){





takeuchi

0:f3675b6d19ef


   122

        address = 0x80+(0x54)+_column;





takeuchi

0:f3675b6d19ef


   123

      }





takeuchi

0:f3675b6d19ef


   124







takeuchi

0:f3675b6d19ef


   125

      writeCommand(address);            





takeuchi

0:f3675b6d19ef


   126

}





takeuchi

0:f3675b6d19ef


   127







takeuchi

0:f3675b6d19ef


   128

void TextLCD::cls() {





takeuchi

0:f3675b6d19ef


   129

    writeCommand(0x01); // Clear Display





takeuchi

0:f3675b6d19ef


   130

    wait(0.00164f);        // This command takes 1.64 ms





takeuchi

0:f3675b6d19ef


   131

      locate(0, 0);





takeuchi

0:f3675b6d19ef


   132

}





takeuchi

0:f3675b6d19ef


   133







takeuchi

0:f3675b6d19ef


   134

void TextLCD::reset() {





takeuchi

0:f3675b6d19ef


   135

    cls();





takeuchi

0:f3675b6d19ef


   136

}





takeuchi

0:f3675b6d19ef


   137







takeuchi

0:f3675b6d19ef


   138

void TextLCD::clock() {





takeuchi

0:f3675b6d19ef


   139

    wait(0.000040f);





takeuchi

0:f3675b6d19ef


   140

    _e = 0;





takeuchi

0:f3675b6d19ef


   141

    wait(0.000040f);  // most instructions take 40us





takeuchi

0:f3675b6d19ef


   142

    _e = 1;    





takeuchi

0:f3675b6d19ef


   143

}





takeuchi

0:f3675b6d19ef


   144







takeuchi

0:f3675b6d19ef


   145

void TextLCD::writeNibble(int value) {





takeuchi

0:f3675b6d19ef


   146

    _d = value;





takeuchi

0:f3675b6d19ef


   147

    clock();





takeuchi

0:f3675b6d19ef


   148

}





takeuchi

0:f3675b6d19ef


   149







takeuchi

0:f3675b6d19ef


   150

void TextLCD::writeByte(int value) {





takeuchi

0:f3675b6d19ef


   151

    writeNibble(value >> 4);





takeuchi

0:f3675b6d19ef


   152

    writeNibble(value >> 0);





takeuchi

0:f3675b6d19ef


   153

}





takeuchi

0:f3675b6d19ef


   154







takeuchi

0:f3675b6d19ef


   155

void TextLCD::writeCommand(int command) {





takeuchi

0:f3675b6d19ef


   156

    _rs = 0;





takeuchi

0:f3675b6d19ef


   157

    writeByte(command);





takeuchi

0:f3675b6d19ef


   158

}





takeuchi

0:f3675b6d19ef


   159







takeuchi

0:f3675b6d19ef


   160

void TextLCD::writeData(int data) {





takeuchi

0:f3675b6d19ef


   161

    _rs = 1;





takeuchi

0:f3675b6d19ef


   162

    writeByte(data);





takeuchi

0:f3675b6d19ef


   163

    _column++;





takeuchi

0:f3675b6d19ef


   164

    if(_column >= _columns) {





takeuchi

0:f3675b6d19ef


   165

        newline();





takeuchi

0:f3675b6d19ef


   166

    } 





takeuchi

0:f3675b6d19ef


   167

}