hd44780_8bit.cpp

00001 /*
00002  * mbed LCDWindow library
00003 * Copyright (c) 2010 Hendrik Lipka
00004 * 
00005 * Permission is hereby granted, free of charge, to any person obtaining a copy
00006 * of this software and associated documentation files (the "Software"), to deal
00007 * in the Software without restriction, including without limitation the rights
00008 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00009 * copies of the Software, and to permit persons to whom the Software is
00010 * furnished to do so, subject to the following conditions:
00011 * 
00012 * The above copyright notice and this permission notice shall be included in
00013 * all copies or substantial portions of the Software.
00014 * 
00015 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00016 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00017 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00018 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00019 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00020 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
00021 * THE SOFTWARE.
00022 */
00023 
00024 #include "hd44780_8bit.h"
00025 
00026 #include "BusOut.h"
00027 #include "DigitalOut.h"
00028 #include "wait_api.h"
00029 
00030 void HD44780LCD8bit::character(int column, int row, int c)
00031 {
00032     int address=(row)*0x40+(column);
00033     if (!_guard->take())
00034         return;
00035     sendCmd((unsigned char)address|0x80);
00036     wait_us(30);
00037     sendData(c);
00038     _guard->release();
00039     wait_us(30);
00040 }
00041 
00042 
00043 void HD44780LCD8bit::writeText(const unsigned int column, const unsigned int row, const char text[]) {
00044 //    printf("print to %d,%d {%s}\n",line,pos,text);
00045     int address=row*0x40+column;
00046     if (!_guard->take())
00047         return;
00048     sendCmd((unsigned char)address|0x80);
00049     wait_us(30);
00050 
00051     int i=0;
00052     while (text[i]!=0) {
00053         sendData(text[i]);
00054         wait_us(30);
00055         i++;
00056     }
00057     _guard->release();
00058 }
00059 
00060 void HD44780LCD8bit::clear() {
00061     if (!_guard->take())
00062         return;
00063     sendCmd(1);
00064     _guard->release();
00065 }
00066 
00067 void HD44780LCD8bit::sendCmd(const unsigned char cmd) {
00068     _rs->write(0);
00069     wait_us(1);
00070     sendByte(cmd);
00071 }
00072 
00073 void HD44780LCD8bit::sendData(const unsigned char cmd) {
00074     _rs->write(1);
00075     wait_us(1);
00076     sendByte(cmd);
00077 }
00078 
00079 HD44780LCD8bit::HD44780LCD8bit 
00080 (unsigned int columns, unsigned int rows, BusOut *data, PinName enable, PinName rs)
00081         :TextLCDBase(columns, rows)
00082         {
00083         _data=data;
00084         _rs=new DigitalOut(rs);
00085         _enable=new DigitalOut(enable);
00086     _enable->write(0);
00087     wait_ms(80);
00088 }
00089 
00090 void HD44780LCD8bit::init() {
00091     unsigned char initCmd[5]={0x38,0x08,0x01,0x06,0x0c};
00092     for (int i=0;i<sizeof(initCmd);i++) {
00093         sendCmd(initCmd[i]);
00094         wait_ms(50);
00095     }
00096 }
00097 
00098 void HD44780LCD8bit::sendByte(const unsigned char byte) {
00099     _data->write(byte);
00100     _enable->write(1);
00101     wait_us(2);
00102     _enable->write(0);
00103     wait_us(30);
00104 }
00105