Petras Saduikis / Mbed 2 deprecated OneWireCRC

Now supports DS18B20 and DS18S20 Maxim/Dallas one-wire thermometer devices. Also supports DS18S20 in 9, 10, 11, and 12 bit resolution modes. 'Use Address' mode now checks if the correct device type is present, and informs the user which device to use. Correct temperature conversion times now used in non-parasitic mode. The device should be placed at least 6 inches (15 cm) from the mbed board in order to accurately read ambient temperature.

Dependencies:   mbed

OneWireThermometer.h

Committer:
snatch59
Date:
2010-01-03
Revision:
0:01a6a40578c9

File content as of revision 0:01a6a40578c9:

/*
* OneWireThermometer. Base class for Maxim One-Wire Thermometers. 
* Uses the OneWireCRC library.
*
* Copyright (C) <2010> Petras Saduikis <petras@petras.co.uk>
*
* This file is part of OneWireThermometer.
*
* OneWireThermometer is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* 
* OneWireThermometer is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with OneWireThermometer.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef SNATCH59_ONEWIRETHERMOMETER_H
#define SNATCH59_ONEWIRETHERMOMETER_H

#include <mbed.h>
#include "OneWireCRC.h"
#include "OneWireDefs.h"

typedef unsigned char BYTE;    // something a byte wide

class OneWireThermometer
{
public:
    OneWireThermometer(bool crcOn, bool useAddr, bool parasitic, PinName pin, int device_id);
    
    bool initialize();
    float readTemperature();
    virtual void setResolution(eResolution resln) = 0; 

protected:
    const bool useParasiticPower;
    const bool useCRC;
    const bool useAddress;
    const int deviceId;
    
    eResolution resolution; 
    BYTE address[8];
    
    OneWireCRC oneWire;
    
    void resetAndAddress();
    bool readAndValidateData(BYTE* data);
    virtual float calculateTemperature(BYTE* data) = 0;    // device specific
};

#endif