The iPod controller that I submitted for the mbed challenge
Dependencies: mbed Motordriver PID
user_interface/TextLCD23017.cpp@0:371773dd3dd1, 2011-05-04 (annotated)
- Committer:
- networker
- Date:
- Wed May 04 15:41:13 2011 +0000
- Revision:
- 0:371773dd3dd1
first publication
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
networker | 0:371773dd3dd1 | 1 | /* mbed TextLCD23017 Library, for a 4-bit LCD based on HD44780 |
networker | 0:371773dd3dd1 | 2 | * Copyright (c) 2007-2010, sford, http://mbed.org |
networker | 0:371773dd3dd1 | 3 | * |
networker | 0:371773dd3dd1 | 4 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
networker | 0:371773dd3dd1 | 5 | * of this software and associated documentation files (the "Software"), to deal |
networker | 0:371773dd3dd1 | 6 | * in the Software without restriction, including without limitation the rights |
networker | 0:371773dd3dd1 | 7 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
networker | 0:371773dd3dd1 | 8 | * copies of the Software, and to permit persons to whom the Software is |
networker | 0:371773dd3dd1 | 9 | * furnished to do so, subject to the following conditions: |
networker | 0:371773dd3dd1 | 10 | * |
networker | 0:371773dd3dd1 | 11 | * The above copyright notice and this permission notice shall be included in |
networker | 0:371773dd3dd1 | 12 | * all copies or substantial portions of the Software. |
networker | 0:371773dd3dd1 | 13 | * |
networker | 0:371773dd3dd1 | 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
networker | 0:371773dd3dd1 | 15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
networker | 0:371773dd3dd1 | 16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
networker | 0:371773dd3dd1 | 17 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
networker | 0:371773dd3dd1 | 18 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
networker | 0:371773dd3dd1 | 19 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
networker | 0:371773dd3dd1 | 20 | * THE SOFTWARE. |
networker | 0:371773dd3dd1 | 21 | */ |
networker | 0:371773dd3dd1 | 22 | #include <stdarg.h> |
networker | 0:371773dd3dd1 | 23 | #include "TextLCD23017.h" |
networker | 0:371773dd3dd1 | 24 | #include "mbed.h" |
networker | 0:371773dd3dd1 | 25 | |
networker | 0:371773dd3dd1 | 26 | /************************************************************** |
networker | 0:371773dd3dd1 | 27 | Port A: databus 8-bit bidir, also used as input for keys (A2-A7) |
networker | 0:371773dd3dd1 | 28 | IntA wired to mbed pin?? |
networker | 0:371773dd3dd1 | 29 | PortB: B0 out: keys out, set low to read keys on PortA |
networker | 0:371773dd3dd1 | 30 | B1 in: rot.enc. push button act.L |
networker | 0:371773dd3dd1 | 31 | B2 out: buzzer |
networker | 0:371773dd3dd1 | 32 | B3 in: rot.enc. A |
networker | 0:371773dd3dd1 | 33 | B4 in: rot.enc. B |
networker | 0:371773dd3dd1 | 34 | B5 out: LCD E (CS\) |
networker | 0:371773dd3dd1 | 35 | B6 out: LCD R\W (WR\) |
networker | 0:371773dd3dd1 | 36 | B7 out: LCD RS (A0) |
networker | 0:371773dd3dd1 | 37 | **************************************************************/ |
networker | 0:371773dd3dd1 | 38 | TextLCD23017::TextLCD23017(MCP23017& intf, LCDType type) : _intf(intf), _type(type) { |
networker | 0:371773dd3dd1 | 39 | ::printf("creating lcd\n"); |
networker | 0:371773dd3dd1 | 40 | wait(0.015); // Wait 15ms to ensure powered up of LCD |
networker | 0:371773dd3dd1 | 41 | //init the MCP23017 |
networker | 0:371773dd3dd1 | 42 | intf.direction(PORT_A, PORT_DIR_IN); //input |
networker | 0:371773dd3dd1 | 43 | intf.direction(PORT_B, INPUTS);// rot enc input |
networker | 0:371773dd3dd1 | 44 | intf.configurePullUps(PORT_A, PORT_DIR_IN); |
networker | 0:371773dd3dd1 | 45 | intf.configurePullUps(PORT_B, INPUTS); |
networker | 0:371773dd3dd1 | 46 | intf.write(PORT_B, 0x00); //enable keys |
networker | 0:371773dd3dd1 | 47 | //intf.interruptPolarity(ACTIVE_LOW); |
networker | 0:371773dd3dd1 | 48 | intf.mirrorInterrupts(true); |
networker | 0:371773dd3dd1 | 49 | |
networker | 0:371773dd3dd1 | 50 | //initialisation according to HD44780 datasheet |
networker | 0:371773dd3dd1 | 51 | // send "Display Settings" 2 times for 8 bit interface |
networker | 0:371773dd3dd1 | 52 | writeByte(0x30); |
networker | 0:371773dd3dd1 | 53 | wait(0.0041); // this command takes 4.1ms, so wait for it |
networker | 0:371773dd3dd1 | 54 | writeByte(0x30); |
networker | 0:371773dd3dd1 | 55 | |
networker | 0:371773dd3dd1 | 56 | |
networker | 0:371773dd3dd1 | 57 | writeByte(0x38); // 8-bit mode, 2 lines 8x5 font |
networker | 0:371773dd3dd1 | 58 | //wait(0.000040f); // most instructions take 40us |
networker | 0:371773dd3dd1 | 59 | writeByte(0x08); //display off, cursor off |
networker | 0:371773dd3dd1 | 60 | writeByte(0x01); //clear display |
networker | 0:371773dd3dd1 | 61 | writeByte(0x06); //increment, no shift |
networker | 0:371773dd3dd1 | 62 | //from here on busy can be tested |
networker | 0:371773dd3dd1 | 63 | |
networker | 0:371773dd3dd1 | 64 | writeCommand(0x0F); //display on, cursor on, blink on |
networker | 0:371773dd3dd1 | 65 | // cls(); |
networker | 0:371773dd3dd1 | 66 | ::printf("lcd created\n"); |
networker | 0:371773dd3dd1 | 67 | } |
networker | 0:371773dd3dd1 | 68 | |
networker | 0:371773dd3dd1 | 69 | int TextLCD23017::printf (char * format, ...) { |
networker | 0:371773dd3dd1 | 70 | char buffer[40]; |
networker | 0:371773dd3dd1 | 71 | va_list args; |
networker | 0:371773dd3dd1 | 72 | va_start (args, format); |
networker | 0:371773dd3dd1 | 73 | int rv=vsprintf (buffer,format, args); |
networker | 0:371773dd3dd1 | 74 | // ::printf("printing:'%s'\n", buffer); |
networker | 0:371773dd3dd1 | 75 | writeString (buffer); |
networker | 0:371773dd3dd1 | 76 | va_end (args); |
networker | 0:371773dd3dd1 | 77 | return rv; |
networker | 0:371773dd3dd1 | 78 | } |
networker | 0:371773dd3dd1 | 79 | |
networker | 0:371773dd3dd1 | 80 | //busy not used, i2c is slow enough |
networker | 0:371773dd3dd1 | 81 | bool TextLCD23017::busy() {//assume PORT_A is input, PORT_A intr disabled, takes minimum 10bytes ~1ms |
networker | 0:371773dd3dd1 | 82 | //setup and hold of RS-E are not met! |
networker | 0:371773dd3dd1 | 83 | _intf.write(PORT_B, RW|E|KEYS); //read R=1, E=1, disable keys |
networker | 0:371773dd3dd1 | 84 | _ar = _intf.read(PORT_A); |
networker | 0:371773dd3dd1 | 85 | _intf.write(PORT_B, KEYS); //read R=0, E=0 |
networker | 0:371773dd3dd1 | 86 | return (_ar & 0x80) ;//return with keys disabled |
networker | 0:371773dd3dd1 | 87 | } |
networker | 0:371773dd3dd1 | 88 | |
networker | 0:371773dd3dd1 | 89 | void TextLCD23017::character(int column, int row, int c) { |
networker | 0:371773dd3dd1 | 90 | int a = address(column, row); |
networker | 0:371773dd3dd1 | 91 | writeCommand(a); |
networker | 0:371773dd3dd1 | 92 | writeData(c); |
networker | 0:371773dd3dd1 | 93 | } |
networker | 0:371773dd3dd1 | 94 | |
networker | 0:371773dd3dd1 | 95 | void TextLCD23017::cls() { |
networker | 0:371773dd3dd1 | 96 | writeCommand(0x01); // cls, and set cursor to 0 |
networker | 0:371773dd3dd1 | 97 | wait(0.00164f); // This command takes 1.64 ms |
networker | 0:371773dd3dd1 | 98 | locate(0, 0); |
networker | 0:371773dd3dd1 | 99 | } |
networker | 0:371773dd3dd1 | 100 | |
networker | 0:371773dd3dd1 | 101 | void TextLCD23017::locate(int column, int row) { |
networker | 0:371773dd3dd1 | 102 | _column = column; |
networker | 0:371773dd3dd1 | 103 | _row = row; |
networker | 0:371773dd3dd1 | 104 | } |
networker | 0:371773dd3dd1 | 105 | |
networker | 0:371773dd3dd1 | 106 | int TextLCD23017::_putc(int value) { |
networker | 0:371773dd3dd1 | 107 | if (value == '\n') { |
networker | 0:371773dd3dd1 | 108 | _column = 0; |
networker | 0:371773dd3dd1 | 109 | _row++; |
networker | 0:371773dd3dd1 | 110 | if (_row >= rows()) { |
networker | 0:371773dd3dd1 | 111 | _row = 0; |
networker | 0:371773dd3dd1 | 112 | } |
networker | 0:371773dd3dd1 | 113 | } else { |
networker | 0:371773dd3dd1 | 114 | character(_column, _row, value); |
networker | 0:371773dd3dd1 | 115 | _column++; |
networker | 0:371773dd3dd1 | 116 | if (_column >= columns()) { |
networker | 0:371773dd3dd1 | 117 | _column = 0; |
networker | 0:371773dd3dd1 | 118 | _row++; |
networker | 0:371773dd3dd1 | 119 | if (_row >= rows()) { |
networker | 0:371773dd3dd1 | 120 | _row = 0; |
networker | 0:371773dd3dd1 | 121 | } |
networker | 0:371773dd3dd1 | 122 | } |
networker | 0:371773dd3dd1 | 123 | } |
networker | 0:371773dd3dd1 | 124 | return value; |
networker | 0:371773dd3dd1 | 125 | } |
networker | 0:371773dd3dd1 | 126 | |
networker | 0:371773dd3dd1 | 127 | int TextLCD23017::_getc() { |
networker | 0:371773dd3dd1 | 128 | return -1; |
networker | 0:371773dd3dd1 | 129 | } |
networker | 0:371773dd3dd1 | 130 | |
networker | 0:371773dd3dd1 | 131 | void TextLCD23017::writeByte(int value) {//5 transactions of 3 bytes ~150bits ~1.5ms |
networker | 0:371773dd3dd1 | 132 | _intf.direction(PORT_A, PORT_DIR_OUT); //set to output |
networker | 0:371773dd3dd1 | 133 | _intf.write(PORT_A, value);//put value on data bus |
networker | 0:371773dd3dd1 | 134 | _intf.write(PORT_B, E|KEYS);//write instruction register, E=1 |
networker | 0:371773dd3dd1 | 135 | _intf.write(PORT_B, KEYS);//E returns to 0 |
networker | 0:371773dd3dd1 | 136 | _intf.direction(PORT_A, PORT_DIR_IN); //set to input |
networker | 0:371773dd3dd1 | 137 | } |
networker | 0:371773dd3dd1 | 138 | |
networker | 0:371773dd3dd1 | 139 | void TextLCD23017::writeCommand(int command) {//3 transactions 3 bytes ~0.9ms + busy + writeByte = 3.4ms |
networker | 0:371773dd3dd1 | 140 | // while (busy()) /*wait*/ ; |
networker | 0:371773dd3dd1 | 141 | writeByte(command); |
networker | 0:371773dd3dd1 | 142 | _intf.write(PORT_B, 0);//enable keys |
networker | 0:371773dd3dd1 | 143 | } |
networker | 0:371773dd3dd1 | 144 | |
networker | 0:371773dd3dd1 | 145 | void TextLCD23017::writeData(int data) { |
networker | 0:371773dd3dd1 | 146 | // while (busy()) /*wait*/ ; |
networker | 0:371773dd3dd1 | 147 | _intf.direction(PORT_A, PORT_DIR_OUT); //set to output |
networker | 0:371773dd3dd1 | 148 | _intf.write(PORT_A, data);//put data on data bus |
networker | 0:371773dd3dd1 | 149 | _intf.write(PORT_B, RS|KEYS);//setup RS |
networker | 0:371773dd3dd1 | 150 | _intf.write(PORT_B, E|RS|KEYS);//write data register, E=1, RS=1 |
networker | 0:371773dd3dd1 | 151 | _intf.write(PORT_B, RS|KEYS);//E returns to 0 |
networker | 0:371773dd3dd1 | 152 | _intf.direction(PORT_A, PORT_DIR_IN); //set to input |
networker | 0:371773dd3dd1 | 153 | _intf.write(PORT_B, 0);//enable keys |
networker | 0:371773dd3dd1 | 154 | } |
networker | 0:371773dd3dd1 | 155 | |
networker | 0:371773dd3dd1 | 156 | void TextLCD23017::writeString(char *s) {//convert a string into LCD commands |
networker | 0:371773dd3dd1 | 157 | char buffer[240];//size must be > 4*strlen(s) + 7 |
networker | 0:371773dd3dd1 | 158 | char *p = strtok(s,"\n"); |
networker | 0:371773dd3dd1 | 159 | _intf.direction(PORT_A, PORT_DIR_OUT); //set to output |
networker | 0:371773dd3dd1 | 160 | //assume RS=0, E=0, R/W = 0 |
networker | 0:371773dd3dd1 | 161 | while (p) { |
networker | 0:371773dd3dd1 | 162 | // ::printf("section:'%s'\n", p); |
networker | 0:371773dd3dd1 | 163 | int i = 0; |
networker | 0:371773dd3dd1 | 164 | if (p != s) {//don't do this the first time (not a newline) |
networker | 0:371773dd3dd1 | 165 | _column = 0; |
networker | 0:371773dd3dd1 | 166 | if (++_row >= rows()) _row = 0; |
networker | 0:371773dd3dd1 | 167 | } |
networker | 0:371773dd3dd1 | 168 | buffer[i++] = E|KEYS;//B, clock RS and RW |
networker | 0:371773dd3dd1 | 169 | buffer[i++] = address(_column, _row);//A, this data is used |
networker | 0:371773dd3dd1 | 170 | buffer[i++] = KEYS;//B, clock data |
networker | 0:371773dd3dd1 | 171 | buffer[i++] = address(_column, _row);//A, dummy |
networker | 0:371773dd3dd1 | 172 | buffer[i++] = RS|KEYS;//B, setup RS |
networker | 0:371773dd3dd1 | 173 | for (int j = 0; j < strlen(p) && i<sizeof(buffer)-4; j++) { |
networker | 0:371773dd3dd1 | 174 | buffer[i++] = p[j];//A, dummy |
networker | 0:371773dd3dd1 | 175 | buffer[i++] = E|RS|KEYS;//B, clock RS and RW |
networker | 0:371773dd3dd1 | 176 | buffer[i++] = p[j];//A, this data is used |
networker | 0:371773dd3dd1 | 177 | buffer[i++] = RS|KEYS;//B, clock data |
networker | 0:371773dd3dd1 | 178 | if (++_column >= columns()) { |
networker | 0:371773dd3dd1 | 179 | _column = 0; |
networker | 0:371773dd3dd1 | 180 | if (++_row >= rows()) _row = 0; |
networker | 0:371773dd3dd1 | 181 | } |
networker | 0:371773dd3dd1 | 182 | }//RS=1, E=0, RW=0 |
networker | 0:371773dd3dd1 | 183 | p = strtok(0, "\n"); |
networker | 0:371773dd3dd1 | 184 | buffer[i++] = 0;//A, dummy |
networker | 0:371773dd3dd1 | 185 | buffer[i++] = (p!=0) ? KEYS : 0; //B, release RS |
networker | 0:371773dd3dd1 | 186 | _intf.write(PORT_B, buffer, i, p != 0);//start with B, send all substrings as a single transaction |
networker | 0:371773dd3dd1 | 187 | } |
networker | 0:371773dd3dd1 | 188 | _intf.direction(PORT_A, PORT_DIR_IN); //set to input |
networker | 0:371773dd3dd1 | 189 | } |
networker | 0:371773dd3dd1 | 190 | |
networker | 0:371773dd3dd1 | 191 | int TextLCD23017::address(int column, int row) { |
networker | 0:371773dd3dd1 | 192 | switch (_type) { |
networker | 0:371773dd3dd1 | 193 | case LCD20x4: |
networker | 0:371773dd3dd1 | 194 | switch (row) { |
networker | 0:371773dd3dd1 | 195 | case 0: |
networker | 0:371773dd3dd1 | 196 | return 0x80 + column; |
networker | 0:371773dd3dd1 | 197 | case 1: |
networker | 0:371773dd3dd1 | 198 | return 0xc0 + column; |
networker | 0:371773dd3dd1 | 199 | case 2: |
networker | 0:371773dd3dd1 | 200 | return 0x94 + column; |
networker | 0:371773dd3dd1 | 201 | case 3: |
networker | 0:371773dd3dd1 | 202 | return 0xd4 + column; |
networker | 0:371773dd3dd1 | 203 | } |
networker | 0:371773dd3dd1 | 204 | case LCD16x2B: |
networker | 0:371773dd3dd1 | 205 | return 0x80 + (row * 40) + column; |
networker | 0:371773dd3dd1 | 206 | case LCD16x2: |
networker | 0:371773dd3dd1 | 207 | case LCD20x2: |
networker | 0:371773dd3dd1 | 208 | default: |
networker | 0:371773dd3dd1 | 209 | return 0x80 + (row * 0x40) + column; |
networker | 0:371773dd3dd1 | 210 | } |
networker | 0:371773dd3dd1 | 211 | } |
networker | 0:371773dd3dd1 | 212 | |
networker | 0:371773dd3dd1 | 213 | int TextLCD23017::columns() { |
networker | 0:371773dd3dd1 | 214 | switch (_type) { |
networker | 0:371773dd3dd1 | 215 | case LCD20x4: |
networker | 0:371773dd3dd1 | 216 | case LCD20x2: |
networker | 0:371773dd3dd1 | 217 | return 20; |
networker | 0:371773dd3dd1 | 218 | case LCD16x2: |
networker | 0:371773dd3dd1 | 219 | case LCD16x2B: |
networker | 0:371773dd3dd1 | 220 | default: |
networker | 0:371773dd3dd1 | 221 | return 16; |
networker | 0:371773dd3dd1 | 222 | } |
networker | 0:371773dd3dd1 | 223 | } |
networker | 0:371773dd3dd1 | 224 | |
networker | 0:371773dd3dd1 | 225 | int TextLCD23017::rows() { |
networker | 0:371773dd3dd1 | 226 | switch (_type) { |
networker | 0:371773dd3dd1 | 227 | case LCD20x4: |
networker | 0:371773dd3dd1 | 228 | return 4; |
networker | 0:371773dd3dd1 | 229 | case LCD16x2: |
networker | 0:371773dd3dd1 | 230 | case LCD16x2B: |
networker | 0:371773dd3dd1 | 231 | case LCD20x2: |
networker | 0:371773dd3dd1 | 232 | default: |
networker | 0:371773dd3dd1 | 233 | return 2; |
networker | 0:371773dd3dd1 | 234 | } |
networker | 0:371773dd3dd1 | 235 | } |