Driver for Text OLED display - 20x4 Winstar or Newhaven, with Winstar WS0010 driver IC
Diff: TextOLED20x4.cpp
- Revision:
- 1:863e06094dfd
- Parent:
- 0:4d453b617559
- Child:
- 2:c7834290ea1c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/TextOLED20x4.cpp Wed Dec 19 13:03:42 2012 +0000 @@ -0,0 +1,191 @@ +/* mbed TextLCD Library, for a 4-bit LCD based on HD44780 + * Copyright (c) 2007-2010, sford, http://mbed.org + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +#include "TextLCD.h" +#include "mbed.h" + +TextLCD::TextLCD(PinName rs, PinName e, PinName d4, PinName d5, + PinName d6, PinName d7, LCDType type) : _rs(rs), + _e(e), _d(d4, d5, d6, d7), + _type(type) { + + _e = 1; + _rs = 0; // command mode + + // Winstar 20x4 WH2004-NYG- needs 40ms after VDD> 4,5V + /* + wait(0.5); + writeCommand(0x2); // 4-bit mode + wait(0.05); + writeCommand(0x28); // Function set 001 BW N F - - + wait(0.05); + */ + //RC:2011-11-23: Newhaven 20x4 OLED data sheet method + wait(0.33); + writeCommand(0x2); // 4-bit mode + wait(0.05); + writeCommand(0x2); // 4-bit mode + wait(0.05); + writeCommand(0x28); // display OFF, "Function Set". 5x8 Font. UK/JP table. Newhaven say 0x08, but this loses 2 rows! + wait(0.05); + writeCommand(0x1); // display clear. takes 6,2ms@fosc=250kHz + wait(0.05); + writeCommand(0x6); // entry mode set + wait(0.05); + writeCommand(0x2); // 4-bit mode + wait(0.05); + writeCommand(0x0C); // ON-OFF ctrl: turns display ON, no cursor. Use 0x0E for cursor ON. + /* 0x28 also works for Winstar WEH002004ALPP5N00000 OLED display. 0x29= westEuro fon table, 0x2A = UK/Russian +*/ + + wait(0.015); // Wait 15ms to ensure powered up +/* + // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus) + for (int i=0; i<3; i++) { + writeByte(0x3); + wait(0.00164); // this command takes 1.64ms, so wait for it + } + writeByte(0x2); // 4-bit mode + wait(0.000040f); // most instructions take 40us + + writeCommand(0x28); // Function set 001 BW N F - - + writeCommand(0x0C); + writeCommand(0x6); // Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes + cls();*/ +} + +void TextLCD::character(int column, int row, int c) { + int a = address(column, row); + writeCommand(a); + writeData(c); +} + +void TextLCD::cls() { + writeCommand(0x01); // cls, and set cursor to 0 + wait(0.00164f); // This command takes 1.64 ms + locate(0, 0); +} + +void TextLCD::locate(int column, int row) { + _column = column; + _row = row; +} + +int TextLCD::_putc(int value) { + if (value == '\n') { + _column = 0; + _row++; + if (_row >= rows()) { + _row = 0; + } + } else { + character(_column, _row, value); + _column++; + if (_column >= columns()) { + _column = 0; + _row++; + if (_row >= rows()) { + _row = 0; + } + } + } + return value; +} + +int TextLCD::_getc() { + return -1; +} + +void TextLCD::writeByte(int value) { + wait_us(1); + _e = 1; // RC added. Must go high at least 20ns after RS settled. + _d = value >> 4; + wait_us(1); + _e = 0; + wait_us(1); + _d = value >> 0; + _e = 1; + wait_us(1); // E high time is 250ns min, and low time 250ns min. + _e = 0; + wait_us(100); // most instructions take 40us + //_e = 1; +} + +void TextLCD::writeCommand(int command) { + _e = 0; + _rs = 0; + writeByte(command); +} + +void TextLCD::writeData(int data) { + _e = 0; + _rs = 1; + writeByte(data); +} + +int TextLCD::address(int column, int row) { + /* switch (_type) { + case LCD20x4:*/ + switch (row) { + case 0: + return 0x80 + column; + case 1: + return 0xc0 + column; + case 2: + return 0x94 + column; + case 3: + return 0xd4 + column; + }/* + case LCD16x2B: + return 0x80 + (row * 40) + column; + case LCD16x2: + case LCD20x2: + default: + return 0x80 + (row * 0x40) + column; + }*/ +} + +int TextLCD::columns() { + return 20; + /* switch (_type) { + case LCD20x4: + case LCD20x2: + return 20; + case LCD16x2: + case LCD16x2B: + default: + return 16; + }*/ +} + +int TextLCD::rows() { + return 4; + /*switch (_type) { + case LCD20x4: + return 4; + case LCD16x2: + case LCD16x2B: + case LCD20x2: + default: + return 2; + }*/ +}