Plamen Totev / Mbed 2 deprecated peltier

peltier with 2 fans

Dependencies:   mbed TextLCD

DS18B20Multiple/OneWireThermometer.cpp@4:5213bee8158e, 2014-04-14 (annotated)

Committer:
redplam
Date:
Mon Apr 14 02:15:32 2014 +0000
Revision:
4:5213bee8158e
myproject;

Who changed what in which revision?

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redplam 4:5213bee8158e 1 /*
redplam 4:5213bee8158e 2 * OneWireThermometer. Base class for Maxim One-Wire Thermometers.
redplam 4:5213bee8158e 3 * Uses the OneWireCRC library.
redplam 4:5213bee8158e 4 *
redplam 4:5213bee8158e 5 * Copyright (C) <2010> Petras Saduikis <petras@petras.co.uk>
redplam 4:5213bee8158e 6 *
redplam 4:5213bee8158e 7 * This file is part of OneWireThermometer.
redplam 4:5213bee8158e 8 *
redplam 4:5213bee8158e 9 * OneWireThermometer is free software: you can redistribute it and/or modify
redplam 4:5213bee8158e 10 * it under the terms of the GNU General Public License as published by
redplam 4:5213bee8158e 11 * the Free Software Foundation, either version 3 of the License, or
redplam 4:5213bee8158e 12 * (at your option) any later version.
redplam 4:5213bee8158e 13 *
redplam 4:5213bee8158e 14 * OneWireThermometer is distributed in the hope that it will be useful,
redplam 4:5213bee8158e 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
redplam 4:5213bee8158e 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
redplam 4:5213bee8158e 17 * GNU General Public License for more details.
redplam 4:5213bee8158e 18 *
redplam 4:5213bee8158e 19 * You should have received a copy of the GNU General Public License
redplam 4:5213bee8158e 20 * along with OneWireThermometer. If not, see <http://www.gnu.org/licenses/>.
redplam 4:5213bee8158e 21 */
redplam 4:5213bee8158e 22
redplam 4:5213bee8158e 23 #include "OneWireThermometer.h"
redplam 4:5213bee8158e 24 #include "OneWireDefs.h"
redplam 4:5213bee8158e 25 //#include "DebugTrace.h"
redplam 4:5213bee8158e 26
redplam 4:5213bee8158e 27 //DebugTrace pc(OFF, TO_SERIAL);
redplam 4:5213bee8158e 28
redplam 4:5213bee8158e 29 // constructor specifies standard speed for the 1-Wire comms
redplam 4:5213bee8158e 30 // Used to have params for CRCon and useAddress, can't see why you wouldn't use CRC and you have to use address since there could be more than one.
redplam 4:5213bee8158e 31 OneWireThermometer::OneWireThermometer(PinName pin, int device_id) :
redplam 4:5213bee8158e 32 oneWire(pin, STANDARD), deviceId(device_id), resolution(twelveBit)
redplam 4:5213bee8158e 33 {
redplam 4:5213bee8158e 34 // NOTE: the power-up resolution of a DS18B20 is 12 bits. The DS18S20's resolution is always
redplam 4:5213bee8158e 35 // 9 bits + enhancement, but we treat the DS18S20 as fixed to 12 bits for calculating the
redplam 4:5213bee8158e 36 // conversion time Tconv.
redplam 4:5213bee8158e 37 deviceCount = 0;
redplam 4:5213bee8158e 38 }
redplam 4:5213bee8158e 39
redplam 4:5213bee8158e 40 bool OneWireThermometer::initialize()
redplam 4:5213bee8158e 41 {
redplam 4:5213bee8158e 42 // get all the device addresses for use in selectROM() when reading the temperature
redplam 4:5213bee8158e 43 // pc.traceOut("\r\n");
redplam 4:5213bee8158e 44 //pc.traceOut("New Scan\r\n");
redplam 4:5213bee8158e 45
redplam 4:5213bee8158e 46 oneWire.resetSearch();
redplam 4:5213bee8158e 47 while (oneWire.search(address)) // search for 1-wire device address
redplam 4:5213bee8158e 48 {
redplam 4:5213bee8158e 49 //pc.traceOut("Address = ");
redplam 4:5213bee8158e 50 for (int i = 0; i < ADDRESS_SIZE; i++)
redplam 4:5213bee8158e 51 {
redplam 4:5213bee8158e 52 //pc.traceOut("%x ", (int)address[i]);
redplam 4:5213bee8158e 53 devices[deviceCount][i] = address[i];
redplam 4:5213bee8158e 54 }
redplam 4:5213bee8158e 55 //pc.traceOut("\r\n");
redplam 4:5213bee8158e 56 deviceCount++;
redplam 4:5213bee8158e 57 }
redplam 4:5213bee8158e 58
redplam 4:5213bee8158e 59 if (OneWireCRC::crc8(address, ADDRESS_CRC_BYTE) != address[ADDRESS_CRC_BYTE]) // check address CRC is valid
redplam 4:5213bee8158e 60 {
redplam 4:5213bee8158e 61 //pc.traceOut("CRC is not valid!\r\n");
redplam 4:5213bee8158e 62 wait(2);
redplam 4:5213bee8158e 63 return false;
redplam 4:5213bee8158e 64 }
redplam 4:5213bee8158e 65
redplam 4:5213bee8158e 66 if (address[0] != deviceId)
redplam 4:5213bee8158e 67 {
redplam 4:5213bee8158e 68 // Make sure it is a one-wire thermometer device
redplam 4:5213bee8158e 69 if (DS18B20_ID == deviceId){}
redplam 4:5213bee8158e 70 //pc.traceOut("You need to use a DS1820 or DS18S20 for correct results.\r\n");
redplam 4:5213bee8158e 71 else if (DS18S20_ID == deviceId){}
redplam 4:5213bee8158e 72 //pc.traceOut("You need to use a DS18B20 for correct results.\r\n");
redplam 4:5213bee8158e 73 else{}
redplam 4:5213bee8158e 74 // pc.traceOut("Device is not a DS18B20/DS1820/DS18S20 device.\r\n");
redplam 4:5213bee8158e 75
redplam 4:5213bee8158e 76 wait(2);
redplam 4:5213bee8158e 77 return false;
redplam 4:5213bee8158e 78 }
redplam 4:5213bee8158e 79 else
redplam 4:5213bee8158e 80 {
redplam 4:5213bee8158e 81 if (DS18B20_ID == deviceId){} //pc.traceOut("DS18B20 present and correct.\r\n");
redplam 4:5213bee8158e 82 if (DS18S20_ID == deviceId){} //pc.traceOut("DS1820/DS18S20 present and correct.\r\n");
redplam 4:5213bee8158e 83 }
redplam 4:5213bee8158e 84
redplam 4:5213bee8158e 85 return true;
redplam 4:5213bee8158e 86 }
redplam 4:5213bee8158e 87
redplam 4:5213bee8158e 88 // NOTE ON USING SKIP ROM: ok to use before a Convert command to get all
redplam 4:5213bee8158e 89 // devices on the bus to do simultaneous temperature conversions. BUT can
redplam 4:5213bee8158e 90 // only use before a Read Scratchpad command if there is only one device on the
redplam 4:5213bee8158e 91 // bus. For purpose of this library it is assumed there is only one device
redplam 4:5213bee8158e 92 // on the bus.
redplam 4:5213bee8158e 93 void OneWireThermometer::resetAndAddress()
redplam 4:5213bee8158e 94 {
redplam 4:5213bee8158e 95 oneWire.reset(); // reset device
redplam 4:5213bee8158e 96 oneWire.matchROM(address); // select which device to talk to
redplam 4:5213bee8158e 97 }
redplam 4:5213bee8158e 98
redplam 4:5213bee8158e 99 bool OneWireThermometer::readAndValidateData(BYTE* data)
redplam 4:5213bee8158e 100 {
redplam 4:5213bee8158e 101 bool dataOk = true;
redplam 4:5213bee8158e 102
redplam 4:5213bee8158e 103 resetAndAddress();
redplam 4:5213bee8158e 104 oneWire.writeByte(READSCRATCH); // read Scratchpad
redplam 4:5213bee8158e 105
redplam 4:5213bee8158e 106 // pc.traceOut("read = ");
redplam 4:5213bee8158e 107 for (int i = 0; i < THERMOM_SCRATCHPAD_SIZE; i++)
redplam 4:5213bee8158e 108 {
redplam 4:5213bee8158e 109 // we need all bytes which includes CRC check byte
redplam 4:5213bee8158e 110 data[i] = oneWire.readByte();
redplam 4:5213bee8158e 111 // pc.traceOut("%x ", (int)data[i]);
redplam 4:5213bee8158e 112 }
redplam 4:5213bee8158e 113 //pc.traceOut("\r\n");
redplam 4:5213bee8158e 114
redplam 4:5213bee8158e 115 // Check CRC is valid
redplam 4:5213bee8158e 116 if (!(OneWireCRC::crc8(data, THERMOM_CRC_BYTE) == data[THERMOM_CRC_BYTE]))
redplam 4:5213bee8158e 117 {
redplam 4:5213bee8158e 118 // CRC failed
redplam 4:5213bee8158e 119 // pc.traceOut("CRC FAILED... \r\n");
redplam 4:5213bee8158e 120 dataOk = false;
redplam 4:5213bee8158e 121 }
redplam 4:5213bee8158e 122
redplam 4:5213bee8158e 123 return dataOk;
redplam 4:5213bee8158e 124 }
redplam 4:5213bee8158e 125
redplam 4:5213bee8158e 126 float OneWireThermometer::readTemperature(int device)
redplam 4:5213bee8158e 127 {
redplam 4:5213bee8158e 128 BYTE data[THERMOM_SCRATCHPAD_SIZE];
redplam 4:5213bee8158e 129 float realTemp = -999;
redplam 4:5213bee8158e 130
redplam 4:5213bee8158e 131 // need to select which device here.
redplam 4:5213bee8158e 132 for (int i = 0; i < ADDRESS_SIZE; i++)
redplam 4:5213bee8158e 133 {
redplam 4:5213bee8158e 134 address[i] = devices[device][i];
redplam 4:5213bee8158e 135 }
redplam 4:5213bee8158e 136
redplam 4:5213bee8158e 137 resetAndAddress();
redplam 4:5213bee8158e 138 oneWire.writeByte(CONVERT); // issue Convert command
redplam 4:5213bee8158e 139
redplam 4:5213bee8158e 140 // Removed the check for parasitic power, since we waited the same time anyway.
redplam 4:5213bee8158e 141 wait_ms(CONVERSION_TIME[resolution]);
redplam 4:5213bee8158e 142
redplam 4:5213bee8158e 143 if (readAndValidateData(data)) // issue Read Scratchpad commmand and get data
redplam 4:5213bee8158e 144 {
redplam 4:5213bee8158e 145 realTemp = calculateTemperature(data);
redplam 4:5213bee8158e 146 }
redplam 4:5213bee8158e 147
redplam 4:5213bee8158e 148 return realTemp;
redplam 4:5213bee8158e 149 }
redplam 4:5213bee8158e 150
redplam 4:5213bee8158e 151 int OneWireThermometer::getDeviceCount()
redplam 4:5213bee8158e 152 {
redplam 4:5213bee8158e 153 return deviceCount;
redplam 4:5213bee8158e 154 }