RdDS18B20.h

00001 // Handles OneWire temperature sensors DB18S20
00002 // Can handle multiple devices per pin
00003 // Rob Dobson, 2015
00004 
00005 #ifndef RdDS18B20__H
00006 #define RdDS18B20__H
00007 
00008 #include "mbed.h"
00009 #include "Onewire.h"
00010 #include "Logger.h"
00011 
00012 class DS18B20
00013 {
00014 public:
00015     DS18B20(PinName mbedPin, Logger &logger);
00016     void ReqConvert();
00017     double ReadTemperature(int addrIdx);
00018     void DebugGetAddress(int addrIdx, char* buf);
00019     int SearchToGetAddresses();
00020     int GetNumAddresses()
00021     {
00022         return _numValidAddresses;
00023     }
00024     uint8_t* GetAddress(int addrIdx, uint8_t* addrBufPtr);
00025     char* GetAddressStr(int addrIdx);
00026     double GetLatestTemperature(int addrIdx, time_t& timeOfReading);
00027     
00028     static const int ONEWIRE_ADDR_STRLEN = 3 * ONEWIRE_ADDR_BYTES + 1;
00029     static const int MAX_BUS_DEVICES = 8;
00030     
00031     static const int INVALID_TEMPERATURE = -1000.0;
00032     
00033 private:
00034     int _numValidAddresses;
00035     uint8_t _addrTable[MAX_BUS_DEVICES][ONEWIRE_ADDR_BYTES];
00036     double _temperatureTable[MAX_BUS_DEVICES];
00037     time_t _timeOfReadingTable[MAX_BUS_DEVICES];
00038     Onewire _oneWire;
00039     char _addrStr[ONEWIRE_ADDR_STRLEN];
00040     Logger &_logger;
00041     char* GetChipId(int val);
00042 
00043 };
00044 
00045 #endif