Roland Elmiger / Mbed 2 deprecated AudioCODEC_6

Wave-Player with TLV320

Dependencies:   FatFileSystemCpp I2SSlave TLV320 mbed

LCD/LCD.cpp@0:3087f1924901, 2015-12-09 (annotated)

Committer:
HB9GAA
Date:
Wed Dec 09 20:58:55 2015 +0000
Revision:
0:3087f1924901
Wave-Player with TLV320

Who changed what in which revision?

UserRevisionLine numberNew contents of line
HB9GAA 0:3087f1924901 1 /* mbed LCD Library, for a 4-bit LCD based on HD44780
HB9GAA 0:3087f1924901 2 * Copyright (c) 2007-2012, hb9gaa
HB9GAA 0:3087f1924901 3 */
HB9GAA 0:3087f1924901 4
HB9GAA 0:3087f1924901 5 #include "LCD.h"
HB9GAA 0:3087f1924901 6 #include "mbed.h"
HB9GAA 0:3087f1924901 7
HB9GAA 0:3087f1924901 8 TextLCD::TextLCD(PinName rs, PinName rw, PinName e, PinName d0, PinName d1, PinName d2, PinName d3, LCDType type) : _rs(rs), _rw(rw), _e(e), _d(d0, d1, d2, d3), _type(type)
HB9GAA 0:3087f1924901 9 {
HB9GAA 0:3087f1924901 10 _e = 1;
HB9GAA 0:3087f1924901 11 _rw = 0;
HB9GAA 0:3087f1924901 12 _rs = 0; // command mode
HB9GAA 0:3087f1924901 13
HB9GAA 0:3087f1924901 14 wait(0.015); // Wait 15ms to ensure powered up
HB9GAA 0:3087f1924901 15
HB9GAA 0:3087f1924901 16 // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus)
HB9GAA 0:3087f1924901 17 for (int i=0; i<3; i++)
HB9GAA 0:3087f1924901 18 {
HB9GAA 0:3087f1924901 19 writeByte(0x3);
HB9GAA 0:3087f1924901 20 wait_ms(1.64); // this command takes 1.64ms, so wait for it
HB9GAA 0:3087f1924901 21 }
HB9GAA 0:3087f1924901 22 writeByte(0x2); // 4-bit mode
HB9GAA 0:3087f1924901 23 wait_ms(0.1); // most instructions take 100us
HB9GAA 0:3087f1924901 24
HB9GAA 0:3087f1924901 25 writeCommand(0x28); // Function set 001 BW N F - -
HB9GAA 0:3087f1924901 26 writeCommand(0x0C);
HB9GAA 0:3087f1924901 27 writeCommand(0x6); // Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes
HB9GAA 0:3087f1924901 28 cls();
HB9GAA 0:3087f1924901 29 }
HB9GAA 0:3087f1924901 30
HB9GAA 0:3087f1924901 31
HB9GAA 0:3087f1924901 32 void TextLCD::character(int column, int row, int c)
HB9GAA 0:3087f1924901 33 {
HB9GAA 0:3087f1924901 34 int a = address(column, row);
HB9GAA 0:3087f1924901 35 writeCommand(a);
HB9GAA 0:3087f1924901 36 writeData(c);
HB9GAA 0:3087f1924901 37 }
HB9GAA 0:3087f1924901 38
HB9GAA 0:3087f1924901 39
HB9GAA 0:3087f1924901 40 void TextLCD::cls()
HB9GAA 0:3087f1924901 41 {
HB9GAA 0:3087f1924901 42 writeCommand(0x01); // cls, and set cursor to 0
HB9GAA 0:3087f1924901 43 wait_ms(4.1); // This command takes 4.1 ms
HB9GAA 0:3087f1924901 44 locate(0, 0);
HB9GAA 0:3087f1924901 45 }
HB9GAA 0:3087f1924901 46
HB9GAA 0:3087f1924901 47
HB9GAA 0:3087f1924901 48 void TextLCD::locate(int column, int row)
HB9GAA 0:3087f1924901 49 {
HB9GAA 0:3087f1924901 50 _column = column;
HB9GAA 0:3087f1924901 51 _row = row;
HB9GAA 0:3087f1924901 52 }
HB9GAA 0:3087f1924901 53
HB9GAA 0:3087f1924901 54
HB9GAA 0:3087f1924901 55 int TextLCD::_putc(int value)
HB9GAA 0:3087f1924901 56 {
HB9GAA 0:3087f1924901 57 if (value == '\n')
HB9GAA 0:3087f1924901 58 {
HB9GAA 0:3087f1924901 59 _column = 0;
HB9GAA 0:3087f1924901 60 _row++;
HB9GAA 0:3087f1924901 61 if (_row >= rows())
HB9GAA 0:3087f1924901 62 {
HB9GAA 0:3087f1924901 63 _row = 0;
HB9GAA 0:3087f1924901 64 }
HB9GAA 0:3087f1924901 65 }
HB9GAA 0:3087f1924901 66 else
HB9GAA 0:3087f1924901 67 {
HB9GAA 0:3087f1924901 68 character(_column, _row, value);
HB9GAA 0:3087f1924901 69 _column++;
HB9GAA 0:3087f1924901 70 if (_column >= columns())
HB9GAA 0:3087f1924901 71 {
HB9GAA 0:3087f1924901 72 _column = 0;
HB9GAA 0:3087f1924901 73 _row++;
HB9GAA 0:3087f1924901 74 if (_row >= rows())
HB9GAA 0:3087f1924901 75 {
HB9GAA 0:3087f1924901 76 _row = 0;
HB9GAA 0:3087f1924901 77 }
HB9GAA 0:3087f1924901 78 }
HB9GAA 0:3087f1924901 79 }
HB9GAA 0:3087f1924901 80 return value;
HB9GAA 0:3087f1924901 81 }
HB9GAA 0:3087f1924901 82
HB9GAA 0:3087f1924901 83
HB9GAA 0:3087f1924901 84 int TextLCD::_getc()
HB9GAA 0:3087f1924901 85 {
HB9GAA 0:3087f1924901 86 return -1;
HB9GAA 0:3087f1924901 87 }
HB9GAA 0:3087f1924901 88
HB9GAA 0:3087f1924901 89
HB9GAA 0:3087f1924901 90 void TextLCD::writeByte(int value)
HB9GAA 0:3087f1924901 91 {
HB9GAA 0:3087f1924901 92 _d = value >> 4;
HB9GAA 0:3087f1924901 93 wait(0.0001); // most instructions take 100us
HB9GAA 0:3087f1924901 94 _e = 0;
HB9GAA 0:3087f1924901 95 wait(0.0001);
HB9GAA 0:3087f1924901 96 _e = 1;
HB9GAA 0:3087f1924901 97 _d = value >> 0;
HB9GAA 0:3087f1924901 98 wait(0.0001);
HB9GAA 0:3087f1924901 99 _e = 0;
HB9GAA 0:3087f1924901 100 wait(0.0001);
HB9GAA 0:3087f1924901 101 _e = 1;
HB9GAA 0:3087f1924901 102 }
HB9GAA 0:3087f1924901 103
HB9GAA 0:3087f1924901 104
HB9GAA 0:3087f1924901 105 void TextLCD::writeCommand(int command)
HB9GAA 0:3087f1924901 106 {
HB9GAA 0:3087f1924901 107 _rs = 0;
HB9GAA 0:3087f1924901 108 writeByte(command);
HB9GAA 0:3087f1924901 109 }
HB9GAA 0:3087f1924901 110
HB9GAA 0:3087f1924901 111
HB9GAA 0:3087f1924901 112 void TextLCD::writeData(int data)
HB9GAA 0:3087f1924901 113 {
HB9GAA 0:3087f1924901 114 _rs = 1;
HB9GAA 0:3087f1924901 115 writeByte(data);
HB9GAA 0:3087f1924901 116 }
HB9GAA 0:3087f1924901 117
HB9GAA 0:3087f1924901 118
HB9GAA 0:3087f1924901 119 int TextLCD::address(int column, int row)
HB9GAA 0:3087f1924901 120 {
HB9GAA 0:3087f1924901 121 switch (_type)
HB9GAA 0:3087f1924901 122 {
HB9GAA 0:3087f1924901 123 case LCD20x4:
HB9GAA 0:3087f1924901 124 switch (row)
HB9GAA 0:3087f1924901 125 {
HB9GAA 0:3087f1924901 126 case 0:
HB9GAA 0:3087f1924901 127 return 0x80 + column;
HB9GAA 0:3087f1924901 128 case 1:
HB9GAA 0:3087f1924901 129 return 0xc0 + column;
HB9GAA 0:3087f1924901 130 case 2:
HB9GAA 0:3087f1924901 131 return 0x94 + column;
HB9GAA 0:3087f1924901 132 case 3:
HB9GAA 0:3087f1924901 133 return 0xd4 + column;
HB9GAA 0:3087f1924901 134 }
HB9GAA 0:3087f1924901 135 case LCD16x2B:
HB9GAA 0:3087f1924901 136 return 0x80 + (row * 40) + column;
HB9GAA 0:3087f1924901 137 case LCD16x2:
HB9GAA 0:3087f1924901 138 case LCD20x2:
HB9GAA 0:3087f1924901 139 default:
HB9GAA 0:3087f1924901 140 return 0x80 + (row * 0x40) + column;
HB9GAA 0:3087f1924901 141 }
HB9GAA 0:3087f1924901 142 }
HB9GAA 0:3087f1924901 143
HB9GAA 0:3087f1924901 144
HB9GAA 0:3087f1924901 145 int TextLCD::columns()
HB9GAA 0:3087f1924901 146 {
HB9GAA 0:3087f1924901 147 switch (_type)
HB9GAA 0:3087f1924901 148 {
HB9GAA 0:3087f1924901 149 case LCD20x4:
HB9GAA 0:3087f1924901 150 case LCD20x2:
HB9GAA 0:3087f1924901 151 return 20;
HB9GAA 0:3087f1924901 152 case LCD16x2:
HB9GAA 0:3087f1924901 153 case LCD16x2B:
HB9GAA 0:3087f1924901 154 default:
HB9GAA 0:3087f1924901 155 return 16;
HB9GAA 0:3087f1924901 156 }
HB9GAA 0:3087f1924901 157 }
HB9GAA 0:3087f1924901 158
HB9GAA 0:3087f1924901 159
HB9GAA 0:3087f1924901 160 int TextLCD::rows()
HB9GAA 0:3087f1924901 161 {
HB9GAA 0:3087f1924901 162 switch (_type)
HB9GAA 0:3087f1924901 163 {
HB9GAA 0:3087f1924901 164 case LCD20x4:
HB9GAA 0:3087f1924901 165 return 4;
HB9GAA 0:3087f1924901 166 case LCD16x2:
HB9GAA 0:3087f1924901 167 case LCD16x2B:
HB9GAA 0:3087f1924901 168 case LCD20x2:
HB9GAA 0:3087f1924901 169 default:
HB9GAA 0:3087f1924901 170 return 2;
HB9GAA 0:3087f1924901 171 }
HB9GAA 0:3087f1924901 172 }
HB9GAA 0:3087f1924901 173
HB9GAA 0:3087f1924901 174
HB9GAA 0:3087f1924901 175 void TextLCD::buildChar(unsigned char *p)
HB9GAA 0:3087f1924901 176 {
HB9GAA 0:3087f1924901 177 unsigned char i, j;
HB9GAA 0:3087f1924901 178
HB9GAA 0:3087f1924901 179 for(j=0;j<8;j++) //CGRAM Adresse
HB9GAA 0:3087f1924901 180 {
HB9GAA 0:3087f1924901 181 writeCommand(0x40+(j*8)); //Write to CGRAM
HB9GAA 0:3087f1924901 182 for(i=0;i<8;i++)
HB9GAA 0:3087f1924901 183 writeData(p[i+(j*8)]); //Write the character pattern to CGRAM
HB9GAA 0:3087f1924901 184 }
HB9GAA 0:3087f1924901 185 writeCommand(0x80); //shift back to DDRAM location 0
HB9GAA 0:3087f1924901 186 }