OneWireThermometer.h

00001 /*
00002 * OneWireThermometer. Base class for Maxim One-Wire Thermometers. 
00003 * Uses the OneWireCRC library.
00004 *
00005 * Copyright (C) <2010> Petras Saduikis <petras@petras.co.uk>
00006 *
00007 * This file is part of OneWireThermometer.
00008 *
00009 * OneWireThermometer is free software: you can redistribute it and/or modify
00010 * it under the terms of the GNU General Public License as published by
00011 * the Free Software Foundation, either version 3 of the License, or
00012 * (at your option) any later version.
00013 * 
00014 * OneWireThermometer is distributed in the hope that it will be useful,
00015 * but WITHOUT ANY WARRANTY; without even the implied warranty of
00016 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00017 * GNU General Public License for more details.
00018 *
00019 * You should have received a copy of the GNU General Public License
00020 * along with OneWireThermometer.  If not, see <http://www.gnu.org/licenses/>.
00021 */
00022 
00023 #ifndef SNATCH59_ONEWIRETHERMOMETER_H
00024 #define SNATCH59_ONEWIRETHERMOMETER_H
00025 
00026 #include <mbed.h>
00027 #include "OneWireCRC.h"
00028 #include "OneWireDefs.h"
00029 
00030 typedef unsigned char BYTE;    // something a byte wide
00031 typedef unsigned char DEVADDRESS[8];   // stores the address of one device
00032 
00033 class OneWireThermometer
00034 {
00035 public:
00036     OneWireThermometer(PinName pin, int device_id);
00037     
00038     bool initialize();
00039     float readTemperature(int device);
00040     virtual void setResolution(eResolution resln) = 0; 
00041     int getDeviceCount();
00042 
00043 protected:
00044     OneWireCRC oneWire;
00045     const int deviceId;
00046     
00047     eResolution resolution; 
00048     BYTE address[8];
00049     DEVADDRESS devices[10];
00050     int deviceCount;
00051    
00052     void resetAndAddress();
00053     bool readAndValidateData(BYTE* data);
00054     virtual float calculateTemperature(BYTE* data) = 0;    // device specific
00055 };
00056 
00057 #endif