Diff: TextLCD.cpp

Revision:

1:402b32a1025f

Parent:

0:6beb6f498640

diff -r 6beb6f498640 -r 402b32a1025f TextLCD.cpp
--- a/TextLCD.cpp	Mon Aug 09 14:17:02 2010 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,193 +0,0 @@
-/* mbed I2CTextLCD Library, for a 4-bit LCD driven by I2C and a PCF8574
- * Copyright (c) 2007-2010, sford, rcocking
- *
- * 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.
- */
-
-/* This is a hack of Simon Ford's direct-driven TextLCD code.
-* It should be refactored to extract a common superclass
-* but my C++ isn't yet good enough :) 
-*
-* The code assumes the following connections between the PCF8574
-* and the LCD
-* 
-* nc  - D0
-* nc  - D1
-* nc  - D2
-* nc  - D3
-* P0  - D4
-* P1  - D5
-* P2  - D6
-* P3  - D7
-* P4  - E
-* P5  - nc
-* P6  - nc
-* P7  - RS
-* gnd - R/W
-*
-* D0-3 of the LCD are not connected because we work in 4-bit mode
-* R/W is hardwired to gound, as we only ever write to the LCD
-* A0-2 on the PCF8574 can be set in any combination; you will need to modify
-* the I2C address in the I2CTextLCD constructor.
-* Remember that the mbed uses 8-bit addresses, which should be
-* in the range 0x40-0x4E for the PCF8574
-*/
-#include "TextLCD.h"
-#include "mbed.h"
-
-TextLCD::TextLCD(PinName sda, PinName scl, int i2cAddress, LCDType type) : _i2c(sda, scl),
-        _type(type) {
-    _i2cAddress = i2cAddress;
-    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, false);
-        wait(0.00164);  // this command takes 1.64ms, so wait for it
-    }
-    writeByte(0x2, false);     // 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::writeI2CByte(int data) {
-    // equivalent to writeI2CByte
-    char * cmd = new char[1];
-    cmd[0] = data;
-    _i2c.write(_i2cAddress, cmd, 1);
-}
-
-void TextLCD::writeNibble(int data, bool rs) {
-    if (rs) {
-        data = data | RS_ON; // set rs bit
-    }
-    data |= E_ON; // E on
-    writeI2CByte(data);
-    data ^= E_ON; // E off
-    wait_us(1);
-    writeI2CByte(data);
-    wait_us(1000);
-}
-
-void TextLCD::writeByte(int data, bool rs) {
-    writeNibble(data >> 4, rs);
-    writeNibble(data & 0x0F, rs);
-}
-
-void TextLCD::writeCommand(int command) {
-    // equivalent to ard commandWrite
-    writeByte(command, false);
-}
-
-void TextLCD::writeData(int data) {
-
-    writeByte(data, true);
-}
-
-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() {
-    switch (_type) {
-        case LCD20x4:
-        case LCD20x2:
-            return 20;
-        case LCD16x2:
-        case LCD16x2B:
-        default:
-            return 16;
-    }
-}
-
-int TextLCD::rows() {
-    switch (_type) {
-        case LCD20x4:
-            return 4;
-        case LCD16x2:
-        case LCD16x2B:
-        case LCD20x2:
-        default:
-            return 2;
-    }
-}