my lcd
Fork of TextLCD by
TextLCD.cpp
- Committer:
- Janet
- Date:
- 2015-12-17
- Revision:
- 9:609f5265134b
- Parent:
- 7:44f34c09bd37
File content as of revision 9:609f5265134b:
/* 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" namespace ext_text_lcd { namespace { int makeLcdAddress(const TextLCD::LCDType &type, int column, int row) { return column + row * 0x40; } int makeLcdAddress40(const TextLCD::LCDType &type, int column, int row) { return column + row * 40; } int makeLcdAddress4Rows(const TextLCD::LCDType &type, int column, int row) { return column + (row % 2) * 0x40 + (row / 2) * 20; } } const TextLCD::LCDType TextLCD::LCD16x2(16, 2, makeLcdAddress); const TextLCD::LCDType TextLCD::LCD16x2B(16, 2, makeLcdAddress40); const TextLCD::LCDType TextLCD::LCD20x2(20, 2, makeLcdAddress); const TextLCD::LCDType TextLCD::LCD20x4(20, 4, makeLcdAddress4Rows); TextLCD::TextLCD(PinName rs, PinName e, PinName d4, PinName d5, PinName d6, PinName d7, const LCDType &type) : _rs(rs), _e(e), _output(new BusOutput(d4, d5, d6, d7)), _type(type) { init(); } TextLCD::TextLCD(PinName rs, PinName e, PortName dport, std::size_t dlsb, const LCDType &type) : _rs(rs), _e(e), _output(new PortOutput(dport, dlsb)), _type(type) { init(); } void TextLCD::init() { _e = 1; _rs = 0; // command mode 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::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 a = address(column, row); writeCommand(0x80 | a); } int TextLCD::_putc(int value) { int column = _column; int row = _row; if (value == '\n') { column = 0; row = _row+1; } else { writeData(value); column++; if (column < columns()) { return value; } column = 0; row++; } if (row >= rows()) { row = 0; } locate(column, row); return value; } int TextLCD::_getc() { return -1; } void TextLCD::writeByte(int value) { _output->writeNibble(value >> 4); wait(0.000040f); // most instructions take 40us _e = 0; wait(0.000040f); _e = 1; _output->writeNibble(value); wait(0.000040f); _e = 0; wait(0.000040f); // most instructions take 40us _e = 1; } void TextLCD::writeCommand(int command) { _rs = 0; writeByte(command); } void TextLCD::writeData(int data) { _rs = 1; writeByte(data); } void TextLCD::setDisplayControl(DisplayControl d, CursorDisplayControl c, CursorStyle b) { writeCommand(0x08 | d | c | b); } void TextLCD::writeToCGMem(unsigned addr, const char *buffer, std::size_t size) { writeCommand(0x40 | (addr & 0x3f)); while (size > 0) { writeData(*buffer); size--; buffer++; } locate(_column, _row); } void TextLCD::BusOutput::writeNibble(int value) { _bus = value; } void TextLCD::PortOutput::writeNibble(int value) { _port = value << _shift; } } // ext_text_lcd namespace