test code megasquirt and digole lcd
Dependencies: FatFileSystem mbed
TextLCD.cpp@0:7ea8f0d27a4f, 2015-11-27 (annotated)
- Committer:
- jpnovak
- Date:
- Fri Nov 27 16:32:41 2015 +0000
- Revision:
- 0:7ea8f0d27a4f
test code megasquirt digole;
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
jpnovak | 0:7ea8f0d27a4f | 1 | /* draft mbed TextLCD |
jpnovak | 0:7ea8f0d27a4f | 2 | * (c) 2007/8, sford |
jpnovak | 0:7ea8f0d27a4f | 3 | */ |
jpnovak | 0:7ea8f0d27a4f | 4 | |
jpnovak | 0:7ea8f0d27a4f | 5 | #include "TextLCD.h" |
jpnovak | 0:7ea8f0d27a4f | 6 | |
jpnovak | 0:7ea8f0d27a4f | 7 | #include "mbed.h" |
jpnovak | 0:7ea8f0d27a4f | 8 | |
jpnovak | 0:7ea8f0d27a4f | 9 | using namespace mbed; |
jpnovak | 0:7ea8f0d27a4f | 10 | |
jpnovak | 0:7ea8f0d27a4f | 11 | /* |
jpnovak | 0:7ea8f0d27a4f | 12 | * useful info found at http://www.a-netz.de/lcd.en.php |
jpnovak | 0:7ea8f0d27a4f | 13 | * |
jpnovak | 0:7ea8f0d27a4f | 14 | * |
jpnovak | 0:7ea8f0d27a4f | 15 | * Initialisation |
jpnovak | 0:7ea8f0d27a4f | 16 | * ============== |
jpnovak | 0:7ea8f0d27a4f | 17 | * |
jpnovak | 0:7ea8f0d27a4f | 18 | * After attaching the supply voltage/after a reset, the display needs to be brought in to a defined state |
jpnovak | 0:7ea8f0d27a4f | 19 | * |
jpnovak | 0:7ea8f0d27a4f | 20 | * - wait approximately 15 ms so the display is ready to execute commands |
jpnovak | 0:7ea8f0d27a4f | 21 | * - Execute the command 0x30 ("Display Settings") three times (wait 1,64ms after each command, the busy flag cannot be queried now). |
jpnovak | 0:7ea8f0d27a4f | 22 | * - 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. |
jpnovak | 0:7ea8f0d27a4f | 23 | * - If you want to use the 4 bit mode, now you can execute the command to switch over to this mode now. |
jpnovak | 0:7ea8f0d27a4f | 24 | * - Execute the "clear display" command |
jpnovak | 0:7ea8f0d27a4f | 25 | * |
jpnovak | 0:7ea8f0d27a4f | 26 | * Timing |
jpnovak | 0:7ea8f0d27a4f | 27 | * ====== |
jpnovak | 0:7ea8f0d27a4f | 28 | * |
jpnovak | 0:7ea8f0d27a4f | 29 | * Nearly all commands transmitted to the display need 40us for execution. |
jpnovak | 0:7ea8f0d27a4f | 30 | * Exceptions are the commands "Clear Display and Reset" and "Set Cursor to Start Position" |
jpnovak | 0:7ea8f0d27a4f | 31 | * These commands need 1.64ms for execution. These timings are valid for all displays working with an |
jpnovak | 0:7ea8f0d27a4f | 32 | * internal clock of 250kHz. But I do not know any displays that use other frequencies. Any time you |
jpnovak | 0:7ea8f0d27a4f | 33 | * can use the busy flag to test if the display is ready to accept the next command. |
jpnovak | 0:7ea8f0d27a4f | 34 | * |
jpnovak | 0:7ea8f0d27a4f | 35 | * _e is kept high apart from calling clock |
jpnovak | 0:7ea8f0d27a4f | 36 | * _rw is kept 0 (write) apart from actions that uyse it differently |
jpnovak | 0:7ea8f0d27a4f | 37 | * _rs is set by the data/command writes |
jpnovak | 0:7ea8f0d27a4f | 38 | */ |
jpnovak | 0:7ea8f0d27a4f | 39 | |
jpnovak | 0:7ea8f0d27a4f | 40 | |
jpnovak | 0:7ea8f0d27a4f | 41 | //wait(0.05); |
jpnovak | 0:7ea8f0d27a4f | 42 | |
jpnovak | 0:7ea8f0d27a4f | 43 | TextLCD::TextLCD(PinName rs, PinName rw, PinName e, PinName d0, PinName d1, |
jpnovak | 0:7ea8f0d27a4f | 44 | PinName d2, PinName d3, int columns, int rows) : _rw(rw), _rs(rs), |
jpnovak | 0:7ea8f0d27a4f | 45 | _e(e), _d(d0, d1, d2, d3), _columns(columns), _rows(rows) { |
jpnovak | 0:7ea8f0d27a4f | 46 | |
jpnovak | 0:7ea8f0d27a4f | 47 | _rows = 4; |
jpnovak | 0:7ea8f0d27a4f | 48 | _columns = 20; |
jpnovak | 0:7ea8f0d27a4f | 49 | wait(0.05); |
jpnovak | 0:7ea8f0d27a4f | 50 | _rw = 0; |
jpnovak | 0:7ea8f0d27a4f | 51 | _e = 1; |
jpnovak | 0:7ea8f0d27a4f | 52 | _rs = 0; // command mode |
jpnovak | 0:7ea8f0d27a4f | 53 | wait(0.05); |
jpnovak | 0:7ea8f0d27a4f | 54 | // Should theoretically wait 15ms, but most things will be powered up pre-reset |
jpnovak | 0:7ea8f0d27a4f | 55 | // so i'll disable that for the minute. If implemented, could wait 15ms post reset |
jpnovak | 0:7ea8f0d27a4f | 56 | // instead |
jpnovak | 0:7ea8f0d27a4f | 57 | // wait(0.015); |
jpnovak | 0:7ea8f0d27a4f | 58 | |
jpnovak | 0:7ea8f0d27a4f | 59 | // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus) |
jpnovak | 0:7ea8f0d27a4f | 60 | for(int i=0; i<3; i++) { |
jpnovak | 0:7ea8f0d27a4f | 61 | writeNibble(0x3); |
jpnovak | 0:7ea8f0d27a4f | 62 | wait(0.005); // this command takes 1.64ms, so wait for it |
jpnovak | 0:7ea8f0d27a4f | 63 | } |
jpnovak | 0:7ea8f0d27a4f | 64 | wait(0.1); |
jpnovak | 0:7ea8f0d27a4f | 65 | writeNibble(0x2); // 4-bit mode |
jpnovak | 0:7ea8f0d27a4f | 66 | wait(0.001); |
jpnovak | 0:7ea8f0d27a4f | 67 | writeCommand(0x28); // Function set 001 BW N F - - |
jpnovak | 0:7ea8f0d27a4f | 68 | wait(0.001); |
jpnovak | 0:7ea8f0d27a4f | 69 | writeCommand(0x0C); |
jpnovak | 0:7ea8f0d27a4f | 70 | wait(0.001); |
jpnovak | 0:7ea8f0d27a4f | 71 | writeCommand(0x6); // Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes |
jpnovak | 0:7ea8f0d27a4f | 72 | cls(); |
jpnovak | 0:7ea8f0d27a4f | 73 | } |
jpnovak | 0:7ea8f0d27a4f | 74 | |
jpnovak | 0:7ea8f0d27a4f | 75 | |
jpnovak | 0:7ea8f0d27a4f | 76 | |
jpnovak | 0:7ea8f0d27a4f | 77 | int TextLCD::_putc(int value) { |
jpnovak | 0:7ea8f0d27a4f | 78 | if(value == '\n') { |
jpnovak | 0:7ea8f0d27a4f | 79 | newline(); |
jpnovak | 0:7ea8f0d27a4f | 80 | } else { |
jpnovak | 0:7ea8f0d27a4f | 81 | writeData(value); |
jpnovak | 0:7ea8f0d27a4f | 82 | } |
jpnovak | 0:7ea8f0d27a4f | 83 | return value; |
jpnovak | 0:7ea8f0d27a4f | 84 | } |
jpnovak | 0:7ea8f0d27a4f | 85 | |
jpnovak | 0:7ea8f0d27a4f | 86 | int TextLCD::_getc() { |
jpnovak | 0:7ea8f0d27a4f | 87 | return 0; |
jpnovak | 0:7ea8f0d27a4f | 88 | } |
jpnovak | 0:7ea8f0d27a4f | 89 | |
jpnovak | 0:7ea8f0d27a4f | 90 | void TextLCD::newline() { |
jpnovak | 0:7ea8f0d27a4f | 91 | _column = 0; |
jpnovak | 0:7ea8f0d27a4f | 92 | _row++; |
jpnovak | 0:7ea8f0d27a4f | 93 | if(_row >= _rows) { |
jpnovak | 0:7ea8f0d27a4f | 94 | _row = 0; |
jpnovak | 0:7ea8f0d27a4f | 95 | } |
jpnovak | 0:7ea8f0d27a4f | 96 | locate(_column, _row); |
jpnovak | 0:7ea8f0d27a4f | 97 | } |
jpnovak | 0:7ea8f0d27a4f | 98 | |
jpnovak | 0:7ea8f0d27a4f | 99 | void TextLCD::locate(int column, int row) |
jpnovak | 0:7ea8f0d27a4f | 100 | { |
jpnovak | 0:7ea8f0d27a4f | 101 | /* if(column < 0 || column >= _columns || row < 0 || row >= _rows) { |
jpnovak | 0:7ea8f0d27a4f | 102 | ERROR("locate(%d,%d) out of range on %dx%d display", column, row, _columns, _rows); |
jpnovak | 0:7ea8f0d27a4f | 103 | return; |
jpnovak | 0:7ea8f0d27a4f | 104 | }*/ |
jpnovak | 0:7ea8f0d27a4f | 105 | |
jpnovak | 0:7ea8f0d27a4f | 106 | _row = row; |
jpnovak | 0:7ea8f0d27a4f | 107 | _column = column; |
jpnovak | 0:7ea8f0d27a4f | 108 | int address=0; |
jpnovak | 0:7ea8f0d27a4f | 109 | |
jpnovak | 0:7ea8f0d27a4f | 110 | if (_rows > 2) { |
jpnovak | 0:7ea8f0d27a4f | 111 | // row 0 : 0x0->0x13 |
jpnovak | 0:7ea8f0d27a4f | 112 | // row 1 : 0x40->0x53 |
jpnovak | 0:7ea8f0d27a4f | 113 | // row 2 : 0x14->0x27 |
jpnovak | 0:7ea8f0d27a4f | 114 | // row 3 : 0x54->0x67 |
jpnovak | 0:7ea8f0d27a4f | 115 | |
jpnovak | 0:7ea8f0d27a4f | 116 | switch (_row) { |
jpnovak | 0:7ea8f0d27a4f | 117 | case (0) : address = 0x80 + _column; |
jpnovak | 0:7ea8f0d27a4f | 118 | break; |
jpnovak | 0:7ea8f0d27a4f | 119 | case (1) : address = 0xc0 + _column; |
jpnovak | 0:7ea8f0d27a4f | 120 | break; |
jpnovak | 0:7ea8f0d27a4f | 121 | case (2) : address = 0x94 + _column; |
jpnovak | 0:7ea8f0d27a4f | 122 | break; |
jpnovak | 0:7ea8f0d27a4f | 123 | case (3) : address = 0xd4 + _column; |
jpnovak | 0:7ea8f0d27a4f | 124 | break; |
jpnovak | 0:7ea8f0d27a4f | 125 | } |
jpnovak | 0:7ea8f0d27a4f | 126 | |
jpnovak | 0:7ea8f0d27a4f | 127 | } |
jpnovak | 0:7ea8f0d27a4f | 128 | else { |
jpnovak | 0:7ea8f0d27a4f | 129 | // memory starts at 0x80, and is 40 chars long per row |
jpnovak | 0:7ea8f0d27a4f | 130 | address = 0x80 + (_row * 40) + _column; |
jpnovak | 0:7ea8f0d27a4f | 131 | } |
jpnovak | 0:7ea8f0d27a4f | 132 | |
jpnovak | 0:7ea8f0d27a4f | 133 | writeCommand(address); |
jpnovak | 0:7ea8f0d27a4f | 134 | } |
jpnovak | 0:7ea8f0d27a4f | 135 | |
jpnovak | 0:7ea8f0d27a4f | 136 | |
jpnovak | 0:7ea8f0d27a4f | 137 | void TextLCD::rows(int rows) { |
jpnovak | 0:7ea8f0d27a4f | 138 | _rows = rows; |
jpnovak | 0:7ea8f0d27a4f | 139 | } |
jpnovak | 0:7ea8f0d27a4f | 140 | |
jpnovak | 0:7ea8f0d27a4f | 141 | |
jpnovak | 0:7ea8f0d27a4f | 142 | void TextLCD::columns(int columns) { |
jpnovak | 0:7ea8f0d27a4f | 143 | _columns = columns; |
jpnovak | 0:7ea8f0d27a4f | 144 | } |
jpnovak | 0:7ea8f0d27a4f | 145 | |
jpnovak | 0:7ea8f0d27a4f | 146 | |
jpnovak | 0:7ea8f0d27a4f | 147 | |
jpnovak | 0:7ea8f0d27a4f | 148 | |
jpnovak | 0:7ea8f0d27a4f | 149 | void TextLCD::cls() { |
jpnovak | 0:7ea8f0d27a4f | 150 | writeCommand(0x01); // Clear Display |
jpnovak | 0:7ea8f0d27a4f | 151 | wait(0.00164f); // This command takes 1.64 ms |
jpnovak | 0:7ea8f0d27a4f | 152 | locate(0, 0); |
jpnovak | 0:7ea8f0d27a4f | 153 | } |
jpnovak | 0:7ea8f0d27a4f | 154 | |
jpnovak | 0:7ea8f0d27a4f | 155 | void TextLCD::reset() { |
jpnovak | 0:7ea8f0d27a4f | 156 | cls(); |
jpnovak | 0:7ea8f0d27a4f | 157 | } |
jpnovak | 0:7ea8f0d27a4f | 158 | |
jpnovak | 0:7ea8f0d27a4f | 159 | void TextLCD::clock() { |
jpnovak | 0:7ea8f0d27a4f | 160 | wait(0.00010); |
jpnovak | 0:7ea8f0d27a4f | 161 | _e = 0; |
jpnovak | 0:7ea8f0d27a4f | 162 | wait(0.00010); // most instructions take 40us |
jpnovak | 0:7ea8f0d27a4f | 163 | _e = 1; |
jpnovak | 0:7ea8f0d27a4f | 164 | } |
jpnovak | 0:7ea8f0d27a4f | 165 | |
jpnovak | 0:7ea8f0d27a4f | 166 | void TextLCD::writeNibble(int value) { |
jpnovak | 0:7ea8f0d27a4f | 167 | _d = value; |
jpnovak | 0:7ea8f0d27a4f | 168 | clock(); |
jpnovak | 0:7ea8f0d27a4f | 169 | } |
jpnovak | 0:7ea8f0d27a4f | 170 | |
jpnovak | 0:7ea8f0d27a4f | 171 | void TextLCD::writeByte(int value) { |
jpnovak | 0:7ea8f0d27a4f | 172 | writeNibble(value >> 4); |
jpnovak | 0:7ea8f0d27a4f | 173 | writeNibble(value >> 0); |
jpnovak | 0:7ea8f0d27a4f | 174 | } |
jpnovak | 0:7ea8f0d27a4f | 175 | |
jpnovak | 0:7ea8f0d27a4f | 176 | void TextLCD::writeCommand(int command) { |
jpnovak | 0:7ea8f0d27a4f | 177 | _rs = 0; |
jpnovak | 0:7ea8f0d27a4f | 178 | writeByte(command); |
jpnovak | 0:7ea8f0d27a4f | 179 | } |
jpnovak | 0:7ea8f0d27a4f | 180 | |
jpnovak | 0:7ea8f0d27a4f | 181 | void TextLCD::writeData(int data) { |
jpnovak | 0:7ea8f0d27a4f | 182 | _rs = 1; |
jpnovak | 0:7ea8f0d27a4f | 183 | writeByte(data); |
jpnovak | 0:7ea8f0d27a4f | 184 | _column++; |
jpnovak | 0:7ea8f0d27a4f | 185 | if(_column >= _columns) { |
jpnovak | 0:7ea8f0d27a4f | 186 | newline(); |
jpnovak | 0:7ea8f0d27a4f | 187 | } |
jpnovak | 0:7ea8f0d27a4f | 188 | } |