Modified TextLCD library to support DOG series displays with ST7036 controller.
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TextLCD.cpp
00001 /* mbed TextLCD Library, for a 4-bit LCD based on ST7036 (modified from HD44780 based version) 00002 * Copyright (c) 2007-2010, sford 00003 * 00004 * Permission is hereby granted, free of charge, to any person obtaining a copy 00005 * of this software and associated documentation files (the "Software"), to deal 00006 * in the Software without restriction, including without limitation the rights 00007 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 00008 * copies of the Software, and to permit persons to whom the Software is 00009 * furnished to do so, subject to the following conditions: 00010 * 00011 * The above copyright notice and this permission notice shall be included in 00012 * all copies or substantial portions of the Software. 00013 * 00014 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 00015 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 00016 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 00017 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 00018 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 00019 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 00020 * THE SOFTWARE. 00021 */ 00022 00023 #include "TextLCD.h" 00024 #include "mbed.h" 00025 00026 TextLCD::TextLCD(PinName rs, PinName e, PinName d0, PinName d1, 00027 PinName d2, PinName d3, LCDType type) : _rs(rs), 00028 _e(e), _d(d0, d1, d2, d3), 00029 _type(type) { 00030 00031 _e = 1; 00032 _rs = 0; // command mode 00033 00034 wait(0.015); // Wait 15ms to ensure powered up 00035 00036 // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus) 00037 for (int i=0; i<3; i++) { 00038 writeByte(0x3); 00039 wait(0.00164); // this command takes 1.64ms, so wait for it 00040 } 00041 writeByte(0x2); // 4-bit mode 00042 wait(0.000040f); // most instructions take 40us 00043 00044 writeCommand(0x29); // Function set 001 BW N F - - 00045 writeCommand(0x14); // bias 00046 writeCommand(0x78); // Contrast set 00047 writeCommand(0x5e); // Power/ICON/Contrast 00048 writeCommand(0x6a); // Follower Control 00049 writeCommand(0x0c); // Display ON 00050 writeCommand(0x01); // Clear Display 00051 writeCommand(0x06); // Entry Mode Set 00052 cls(); 00053 } 00054 00055 void TextLCD::character(int column, int row, int c) { 00056 int a = address(column, row); 00057 writeCommand(a); 00058 writeData(c); 00059 } 00060 00061 void TextLCD::cls() { 00062 writeCommand(0x01); // cls, and set cursor to 0 00063 wait(0.00164f); // This command takes 1.64 ms 00064 locate(0, 0); 00065 } 00066 00067 void TextLCD::locate(int column, int row) { 00068 _column = column; 00069 _row = row; 00070 } 00071 00072 int TextLCD::_putc(int value) { 00073 if (value == '\n') { 00074 _column = 0; 00075 _row++; 00076 if (_row >= rows()) { 00077 _row = 0; 00078 } 00079 } else { 00080 character(_column, _row, value); 00081 _column++; 00082 if (_column >= columns()) { 00083 _column = 0; 00084 _row++; 00085 if (_row >= rows()) { 00086 _row = 0; 00087 } 00088 } 00089 } 00090 return value; 00091 } 00092 00093 int TextLCD::_getc() { 00094 return -1; 00095 } 00096 00097 void TextLCD::writeByte(int value) { 00098 _d = value >> 4; 00099 wait(0.000040f); // most instructions take 40us 00100 _e = 0; 00101 wait(0.000040f); 00102 _e = 1; 00103 _d = value >> 0; 00104 wait(0.000040f); 00105 _e = 0; 00106 wait(0.000040f); // most instructions take 40us 00107 _e = 1; 00108 } 00109 00110 void TextLCD::writeCommand(int command) { 00111 _rs = 0; 00112 writeByte(command); 00113 } 00114 00115 void TextLCD::writeData(int data) { 00116 _rs = 1; 00117 writeByte(data); 00118 } 00119 00120 int TextLCD::address(int column, int row) { 00121 switch (_type) { 00122 case LCD20x4: 00123 switch (row) { 00124 case 0: 00125 return 0x80 + column; 00126 case 1: 00127 return 0xc0 + column; 00128 case 2: 00129 return 0x94 + column; 00130 case 3: 00131 return 0xd4 + column; 00132 } 00133 case LCD16x2B: 00134 return 0x80 + (row * 40) + column; 00135 case LCD16x2: 00136 case LCD20x2: 00137 default: 00138 return 0x80 + (row * 0x40) + column; 00139 } 00140 } 00141 00142 int TextLCD::columns() { 00143 switch (_type) { 00144 case LCD20x4: 00145 case LCD20x2: 00146 return 20; 00147 case LCD16x2: 00148 case LCD16x2B: 00149 default: 00150 return 16; 00151 } 00152 } 00153 00154 int TextLCD::rows() { 00155 switch (_type) { 00156 case LCD20x4: 00157 return 4; 00158 case LCD16x2: 00159 case LCD16x2B: 00160 case LCD20x2: 00161 default: 00162 return 2; 00163 } 00164 }
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