James Novak / Mbed 2 deprecated MS-DigoleTest

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?

UserRevisionLine numberNew 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 }