main.ino

// This #include statement was automatically added by the Particle IDE.
#include "spark-dallas-temperature.h"

// This #include statement was automatically added by the Particle IDE.
#include "OneWire.h"

#define oneWirePin D2
#define dsResolution 10
OneWire oneWire(oneWirePin);
DallasTemperature dallasSensor(&oneWire);
DeviceAddress deviceAddress;

 int numSensors = 0;
 unsigned long lastConnectTime = 0;
 int lastBLEStatus = 0;

void setup() {
    Serial1.begin(38400);
    Serial1.println("Staring up, v1.09...");
    pinMode(oneWirePin, INPUT);
    initDallas();
}

void initDallas()
{
    dallasSensor.begin();
    dallasSensor.setResolution(dsResolution);

    //Output sensor info    
    numSensors = dallasSensor.getDeviceCount();
    Serial1.println("Found " + String (numSensors) + " sensors");
    char szROM[24];
    for(int i = 0; i < numSensors; i++)
    {
        delay(10);
        int tries = 0;
        while (tries < 5 && !dallasSensor.getAddress(deviceAddress, i))
        {
            Serial1.println("Bad sensor read");
            delay(10);
        }
        sprintf(szROM, "Sensor %d address: %X %X %X %X %X %X %X %X", i, deviceAddress[0], deviceAddress[1], deviceAddress[2], deviceAddress[3], deviceAddress[4], deviceAddress[5], deviceAddress[6], deviceAddress[7]);
        Serial1.println(szROM);
    }
}

void loop() { 
    checkBLE();
    System.sleep(SLEEP_MODE_CPU);
}

void checkBLE()
{
    BLEState state = BLE.getState();

    if (lastBLEStatus != state)
    { 
        if (state == BLE_CONNECTED)
            Serial1.println("BLE Connected");
        else 
            Serial1.println("BLE NOT Connected; State=" + String(state));
        lastBLEStatus = state;
    }
    if (state == BLE_CONNECTED && Particle.connected()){ 
        if (lastConnectTime == 0) {
            Serial1.println("Particle Connected");
            lastConnectTime = millis(); 
            Serial1.println("Bluz will typically restart by this point");
        }
    }
}

OneWire.cpp

/*
Particle Verison of OneWire Libary
Hotaman 2/1/2016
Bit and Byte write functions have been changed to only drive the bus high at the end of a byte when requested.
They no longer drive the bus for High bits when outputting to avoid a holy war.
Some folks just can't accept that a 10K resistor works just fine when the calculation calls for 10,042.769 ohms.
Bit and Byte writes are now 100% compliant with specs and app notes.
Support for P1 and Electron added by Hotaman 11/30/2015
Support for Photon added by Brendan Albano and cdrodriguez
- Brendan Albano 2015-06-10
I made monor tweeks to allow use in the web builder and created this repository for
use in the contributed libs list.
6/2014 - Hotaman 
I've taken the code that Spark Forum user tidwelltimj posted 
split it back into separte code and header files and put back in the 
credits and comments and got it compiling on the command line within SparkCore core-firmware
Justin Maynard 2013
Original Comments follow
Copyright (c) 2007, Jim Studt  (original old version - many contributors since)
The latest version of this library may be found at:
  http://www.pjrc.com/teensy/td_libs_OneWire.html
OneWire has been maintained by Paul Stoffregen (paul@pjrc.com) since
January 2010.  At the time, it was in need of many bug fixes, but had
been abandoned the original author (Jim Studt).  None of the known
contributors were interested in maintaining OneWire.  Paul typically
works on OneWire every 6 to 12 months.  Patches usually wait that
long.  If anyone is interested in more actively maintaining OneWire,
please contact Paul.
Version 2.2:
  Teensy 3.0 compatibility, Paul Stoffregen, paul@pjrc.com
  Arduino Due compatibility, http://arduino.cc/forum/index.php?topic=141030
  Fix DS18B20 example negative temperature
  Fix DS18B20 example's low res modes, Ken Butcher
  Improve reset timing, Mark Tillotson
  Add const qualifiers, Bertrik Sikken
  Add initial value input to crc16, Bertrik Sikken
  Add target_search() function, Scott Roberts
Version 2.1:
  Arduino 1.0 compatibility, Paul Stoffregen
  Improve temperature example, Paul Stoffregen
  DS250x_PROM example, Guillermo Lovato
  PIC32 (chipKit) compatibility, Jason Dangel, dangel.jason AT gmail.com
  Improvements from Glenn Trewitt:
  - crc16() now works
  - check_crc16() does all of calculation/checking work.
  - Added read_bytes() and write_bytes(), to reduce tedious loops.
  - Added ds2408 example.
  Delete very old, out-of-date readme file (info is here)
Version 2.0: Modifications by Paul Stoffregen, January 2010:
http://www.pjrc.com/teensy/td_libs_OneWire.html
  Search fix from Robin James
    http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1238032295/27#27
  Use direct optimized I/O in all cases
  Disable interrupts during timing critical sections
    (this solves many random communication errors)
  Disable interrupts during read-modify-write I/O
  Reduce RAM consumption by eliminating unnecessary
    variables and trimming many to 8 bits
  Optimize both crc8 - table version moved to flash
Modified to work with larger numbers of devices - avoids loop.
Tested in Arduino 11 alpha with 12 sensors.
26 Sept 2008 -- Robin James
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1238032295/27#27
Updated to work with arduino-0008 and to include skip() as of
2007/07/06. --RJL20
Modified to calculate the 8-bit CRC directly, avoiding the need for
the 256-byte lookup table to be loaded in RAM.  Tested in arduino-0010
-- Tom Pollard, Jan 23, 2008
Jim Studt's original library was modified by Josh Larios.
Tom Pollard, pollard@alum.mit.edu, contributed around May 20, 2008
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Much of the code was inspired by Derek Yerger's code, though I don't
think much of that remains.  In any event that was..
    (copyleft) 2006 by Derek Yerger - Free to distribute freely.
The CRC code was excerpted and inspired by the Dallas Semiconductor
sample code bearing this copyright.
//---------------------------------------------------------------------------
// Copyright (C) 2000 Dallas Semiconductor Corporation, All Rights Reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY,  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL DALLAS SEMICONDUCTOR BE LIABLE FOR ANY CLAIM, DAMAGES
// OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
//
// Except as contained in this notice, the name of Dallas Semiconductor
// shall not be used except as stated in the Dallas Semiconductor
// Branding Policy.
//--------------------------------------------------------------------------
*/

#include "OneWire.h"
#include "application.h"

OneWire::OneWire(uint16_t pin)
{
    pinMode(pin, INPUT);
    _pin = pin;
}
// Perform the onewire reset function.  We will wait up to 250uS for
// the bus to come high, if it doesn't then it is broken or shorted
// and we return a 0;
//
// Returns 1 if a device asserted a presence pulse, 0 otherwise.
//
uint8_t OneWire::reset(void)
{
    uint8_t r;
    uint8_t retries = 125;

    noInterrupts();
    pinModeFastInput();
    interrupts();
    // wait until the wire is high... just in case
    do {
        if (--retries == 0) return 0;

        delayMicroseconds(2);
    } while ( !digitalReadFast());

    noInterrupts();

    digitalWriteFastLow();
    pinModeFastOutput();   // drive output low

    interrupts();
    delayMicroseconds(480);
    noInterrupts();

    pinModeFastInput();    // allow it to float

    delayMicroseconds(70);

    r =! digitalReadFast();

    interrupts();

    delayMicroseconds(410);

    return r;
}

void OneWire::write_bit(uint8_t v)
{
    if (v & 1) {
        noInterrupts();

        digitalWriteFastLow();
        pinModeFastOutput();   // drive output low

        delayMicroseconds(10);

        pinModeFastInput();    // float high

        interrupts();

        delayMicroseconds(55);
    } else {
        noInterrupts();

        digitalWriteFastLow();
        pinModeFastOutput();   // drive output low

        delayMicroseconds(65);

        pinModeFastInput();    // float high

        interrupts();

        delayMicroseconds(5);
    }
}

//
// Read a bit. Port and bit is used to cut lookup time and provide
// more certain timing.
//
uint8_t OneWire::read_bit(void)
{
    uint8_t r;

    noInterrupts();

    digitalWriteFastLow();
    pinModeFastOutput();

    delayMicroseconds(3);

    pinModeFastInput();    // let pin float, pull up will raise

    delayMicroseconds(10);

    r = digitalReadFast();

    interrupts();
    delayMicroseconds(53);

    return r;
}

//
// Write a byte. The writing code uses the active drivers to raise the
// pin high, if you need power after the write (e.g. DS18S20 in
// parasite power mode) then set 'power' to 1, otherwise the pin will
// go tri-state at the end of the write to avoid heating in a short or
// other mishap.
//
void OneWire::write(uint8_t v, uint8_t power /* = 0 */) 
{
    uint8_t bitMask;

    for (bitMask = 0x01; bitMask; bitMask <<= 1) {
        OneWire::write_bit( (bitMask & v)?1:0);
    }

    if ( power) {
        noInterrupts();

        digitalWriteFastHigh();
        pinModeFastOutput();        // Drive pin High when power is True

        interrupts();
    }
}

void OneWire::write_bytes(const uint8_t *buf, uint16_t count, bool power /* = 0 */) 
{
    for (uint16_t i = 0 ; i < count ; i++)
        write(buf[i]);

    if (power) {
        noInterrupts();

        digitalWriteFastHigh();
        pinModeFastOutput();        // Drive pin High when power is True

        interrupts();
    }
}

//
// Read a byte
//
uint8_t OneWire::read() 
{
    uint8_t bitMask;
    uint8_t r = 0;

    for (bitMask = 0x01; bitMask; bitMask <<= 1) {
        if ( OneWire::read_bit()) r |= bitMask;
    }

    return r;
}

void OneWire::read_bytes(uint8_t *buf, uint16_t count) 
{
    for (uint16_t i = 0 ; i < count ; i++)
        buf[i] = read();
}

//
// Do a ROM select
//
void OneWire::select(const uint8_t rom[8])
{
    uint8_t i;

    write(0x55);           // Choose ROM

    for (i = 0; i < 8; i++) write(rom[i]);
}

//
// Do a ROM skip
//
void OneWire::skip()
{
    write(0xCC);           // Skip ROM
}

void OneWire::depower()
{
    noInterrupts();

    pinModeFastInput();

    interrupts();
}

#if ONEWIRE_SEARCH

//
// You need to use this function to start a search again from the beginning.
// You do not need to do it for the first search, though you could.
//
void OneWire::reset_search()
{
    // reset the search state
    LastDiscrepancy = 0;
    LastDeviceFlag = FALSE;
    LastFamilyDiscrepancy = 0;

    for(int i = 7; ; i--) {
        ROM_NO[i] = 0;
        if ( i == 0) break;
    }
}

// Setup the search to find the device type 'family_code' on the next call
// to search(*newAddr) if it is present.
//
void OneWire::target_search(uint8_t family_code)
{
   // set the search state to find SearchFamily type devices

   ROM_NO[0] = family_code;

   for (uint8_t i = 1; i < 8; i++)
      ROM_NO[i] = 0;

   LastDiscrepancy = 64;
   LastFamilyDiscrepancy = 0;
   LastDeviceFlag = FALSE;
}

//
// Perform a search. If this function returns a '1' then it has
// enumerated the next device and you may retrieve the ROM from the
// OneWire::address variable. If there are no devices, no further
// devices, or something horrible happens in the middle of the
// enumeration then a 0 is returned.  If a new device is found then
// its address is copied to newAddr.  Use OneWire::reset_search() to
// start over.
//
// --- Replaced by the one from the Dallas Semiconductor web site ---
//--------------------------------------------------------------------------
// Perform the 1-Wire Search Algorithm on the 1-Wire bus using the existing
// search state.
// Return TRUE  : device found, ROM number in ROM_NO buffer
//        FALSE : device not found, end of search
//
uint8_t OneWire::search(uint8_t *newAddr)
{
    uint8_t id_bit_number;
    uint8_t last_zero, rom_byte_number, search_result;
    uint8_t id_bit, cmp_id_bit;

    unsigned char rom_byte_mask, search_direction;

    // initialize for search
    id_bit_number = 1;
    last_zero = 0;
    rom_byte_number = 0;
    rom_byte_mask = 1;
    search_result = 0;

    // if the last call was not the last one
    if (!LastDeviceFlag)
    {
        // 1-Wire reset
        if (!reset()){
            // reset the search
            LastDiscrepancy = 0;
            LastDeviceFlag = FALSE;
            LastFamilyDiscrepancy = 0;

            return FALSE;
        }

        // issue the search command
        write(0xF0);

        // loop to do the search
        do
        {
            // read a bit and its complement
            id_bit = read_bit();
            cmp_id_bit = read_bit();

            // check for no devices on 1-wire
            if ((id_bit == 1) && (cmp_id_bit == 1)){
                break;
            }
            else
            {
                // all devices coupled have 0 or 1
                if (id_bit != cmp_id_bit){
                    search_direction = id_bit;  // bit write value for search
                }
                else{
                    // if this discrepancy if before the Last Discrepancy
                    // on a previous next then pick the same as last time
                    if (id_bit_number < LastDiscrepancy)
                        search_direction = ((ROM_NO[rom_byte_number] & rom_byte_mask) > 0);
                    else
                        // if equal to last pick 1, if not then pick 0
                        search_direction = (id_bit_number == LastDiscrepancy);

                    // if 0 was picked then record its position in LastZero
                    if (search_direction == 0){
                        last_zero = id_bit_number;

                        // check for Last discrepancy in family
                        if (last_zero < 9)
                            LastFamilyDiscrepancy = last_zero;
                    }
                }

                // set or clear the bit in the ROM byte rom_byte_number
                // with mask rom_byte_mask
                if (search_direction == 1)
                  ROM_NO[rom_byte_number] |= rom_byte_mask;
                else
                  ROM_NO[rom_byte_number] &= ~rom_byte_mask;

                // serial number search direction write bit
                write_bit(search_direction);

                // increment the byte counter id_bit_number
                // and shift the mask rom_byte_mask
                id_bit_number++;
                rom_byte_mask <<= 1;

                // if the mask is 0 then go to new SerialNum byte rom_byte_number and reset mask
                if (rom_byte_mask == 0)
                {
                    rom_byte_number++;
                    rom_byte_mask = 1;
                }
            }
        }while(rom_byte_number < 8);  // loop until through all ROM bytes 0-7

        // if the search was successful then
        if (!(id_bit_number < 65))
        {
            // search successful so set LastDiscrepancy,LastDeviceFlag,search_result
            LastDiscrepancy = last_zero;

            // check for last device
            if (LastDiscrepancy == 0)
                LastDeviceFlag = TRUE;

            search_result = TRUE;
        }
    }

    // if no device found then reset counters so next 'search' will be like a first
    if (!search_result || !ROM_NO[0]){
        LastDiscrepancy = 0;
        LastDeviceFlag = FALSE;
        LastFamilyDiscrepancy = 0;
        search_result = FALSE;
    }

    for (int i = 0; i < 8; i++) newAddr[i] = ROM_NO[i];

    return search_result;
}

#endif

#if ONEWIRE_CRC
// The 1-Wire CRC scheme is described in Maxim Application Note 27:
// "Understanding and Using Cyclic Redundancy Checks with Maxim iButton Products"
//


//
// Compute a Dallas Semiconductor 8 bit CRC directly.
// this is much slower, but much smaller, than the lookup table.
//
uint8_t OneWire::crc8( uint8_t *addr, uint8_t len)
{
    uint8_t crc = 0;

    while (len--) {
        uint8_t inbyte = *addr++;
        for (uint8_t i = 8; i; i--) {
            uint8_t mix = (crc ^ inbyte) & 0x01;
            crc >>= 1;
            if (mix) crc ^= 0x8C;
                inbyte >>= 1;
        }
    }

    return crc;
}
#endif

#if ONEWIRE_CRC16
bool OneWire::check_crc16(const uint8_t* input, uint16_t len, const uint8_t* inverted_crc, uint16_t crc)
{
    crc = ~crc16(input, len, crc);

    return (crc & 0xFF) == inverted_crc[0] && (crc >> 8) == inverted_crc[1];
}

uint16_t OneWire::crc16(const uint8_t* input, uint16_t len, uint16_t crc)
{
    static const uint8_t oddparity[16] =
        { 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0 };

    for (uint16_t i = 0 ; i < len ; i++) {
        // Even though we're just copying a byte from the input,
        // we'll be doing 16-bit computation with it.
        uint16_t cdata = input[i];
        cdata = (cdata ^ crc) & 0xff;
        crc >>= 8;

        if (oddparity[cdata & 0x0F] ^ oddparity[cdata >> 4])
            crc ^= 0xC001;

        cdata <<= 6;
        crc ^= cdata;
        cdata <<= 1;
        crc ^= cdata;
    }

    return crc;
}
#endif

OneWire.h

/* Temporary for a few weeks until the Web IDE is updated */
#include "application.h"
#include "pinmap_impl.h"
#undef SCK
#undef MISO
#undef MOSI
#undef SS
#include "nrf_gpio.h"
/* End of temporary includes */

#ifndef OneWire_h
#define OneWire_h

#include <inttypes.h>
#include "application.h"

// you can exclude onewire_search by defining that to 0
#ifndef ONEWIRE_SEARCH
#define ONEWIRE_SEARCH 1
#endif

// You can exclude CRC checks altogether by defining this to 0
#ifndef ONEWIRE_CRC
#define ONEWIRE_CRC 1
#endif



// You can allow 16-bit CRC checks by defining this to 1
// (Note that ONEWIRE_CRC must also be 1.)
#ifndef ONEWIRE_CRC16
#define ONEWIRE_CRC16 1
#endif

// TRUE and FALSE are defined by default on the Spark
// #define FALSE 0
// #define TRUE  1

class OneWire
{
private:
  uint16_t _pin;

/**************Conditional fast pin access for Core and Photon*****************/
  #if PLATFORM_ID == 0 // Core
    inline void digitalWriteFastLow() {
      PIN_MAP[_pin].gpio_peripheral->BRR = PIN_MAP[_pin].gpio_pin;
    }

    inline void digitalWriteFastHigh() {
      PIN_MAP[_pin].gpio_peripheral->BSRR = PIN_MAP[_pin].gpio_pin;
    }

    inline void pinModeFastOutput() {
      GPIO_TypeDef *gpio_port = PIN_MAP[_pin].gpio_peripheral;
      uint16_t gpio_pin = PIN_MAP[_pin].gpio_pin;

      GPIO_InitTypeDef GPIO_InitStructure;

      if (gpio_port == GPIOA )
      {
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
      }
      else if (gpio_port == GPIOB )
      {
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
      }

      GPIO_InitStructure.GPIO_Pin = gpio_pin;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      PIN_MAP[_pin].pin_mode = OUTPUT;
      GPIO_Init(gpio_port, &GPIO_InitStructure);
    }

    inline void pinModeFastInput() {
      GPIO_TypeDef *gpio_port = PIN_MAP[_pin].gpio_peripheral;
      uint16_t gpio_pin = PIN_MAP[_pin].gpio_pin;

      GPIO_InitTypeDef GPIO_InitStructure;

      if (gpio_port == GPIOA )
      {
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
      }
      else if (gpio_port == GPIOB )
      {
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
      }

      GPIO_InitStructure.GPIO_Pin = gpio_pin;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
      PIN_MAP[_pin].pin_mode = INPUT;
      GPIO_Init(gpio_port, &GPIO_InitStructure);
    }

    inline uint8_t digitalReadFast() {
      return GPIO_ReadInputDataBit(PIN_MAP[_pin].gpio_peripheral, PIN_MAP[_pin].gpio_pin);
    }
    #elif PLATFORM_ID == 103 // Bluz
    STM32_Pin_Info* PIN_MAP = HAL_Pin_Map();

    inline void digitalWriteFastLow() {
        nrf_gpio_pin_clear(PIN_MAP[_pin].gpio_pin);
    }

    inline void digitalWriteFastHigh() {
      nrf_gpio_pin_set(PIN_MAP[_pin].gpio_pin);
    }

    inline void pinModeFastOutput(void){
      nrf_gpio_cfg_output(PIN_MAP[_pin].gpio_pin);
    }
    
    inline void pinModeFastInput(void){
      nrf_gpio_cfg_input(PIN_MAP[_pin].gpio_pin, NRF_GPIO_PIN_NOPULL);
    }

    inline uint8_t digitalReadFast(void){
      return nrf_gpio_pin_read(PIN_MAP[_pin].gpio_pin);
    }

  //#elif PLATFORM_ID == 6 || PLATFORM_ID == 8 || PLATFORM_ID == 10 // Photon(P0),P1,Electron
  #else // just do this for everything else until they change it again
    STM32_Pin_Info* PIN_MAP = HAL_Pin_Map(); // Pointer required for highest access speed

    inline void digitalWriteFastLow() {
      PIN_MAP[_pin].gpio_peripheral->BSRRH = PIN_MAP[_pin].gpio_pin;
    }

    inline void digitalWriteFastHigh() {
      PIN_MAP[_pin].gpio_peripheral->BSRRL = PIN_MAP[_pin].gpio_pin;
    }

    inline void pinModeFastOutput(void){
      // This could probably be speed up by digging a little deeper past
      // the HAL_Pin_Mode function.
      HAL_Pin_Mode(_pin, OUTPUT);
    }

    inline void pinModeFastInput(void){
      // This could probably be speed up by digging a little deeper past
      // the HAL_Pin_Mode function.
      HAL_Pin_Mode(_pin, INPUT);
    }

    inline uint8_t digitalReadFast(void){
      // This could probably be speed up by digging a little deeper past
      // the HAL_GPIO_Read function.
      return HAL_GPIO_Read(_pin);
    }

  //#else  // no need for this right now
    //#error "*** PLATFORM_ID not supported by this library. PLATFORM should be Core, Photon, P1 or Electron ***"
  #endif
/**************End conditional fast pin access for Core and Photon*************/

#if ONEWIRE_SEARCH
    // global search state
    unsigned char ROM_NO[8];
    uint8_t LastDiscrepancy;
    uint8_t LastFamilyDiscrepancy;
    uint8_t LastDeviceFlag;
#endif

  public:
    OneWire( uint16_t pin);

    // Perform a 1-Wire reset cycle. Returns 1 if a device responds
    // with a presence pulse.  Returns 0 if there is no device or the
    // bus is shorted or otherwise held low for more than 250uS
    uint8_t reset(void);

    // Issue a 1-Wire rom select command, you do the reset first.
    void select(const uint8_t rom[8]);

    // Issue a 1-Wire rom skip command, to address all on bus.
    void skip(void);

    // Write a byte. If 'power' is one then the wire is held high at
    // the end for parasitically powered devices. You are responsible
    // for eventually depowering it by calling depower() or doing
    // another read or write.
    void write(uint8_t v, uint8_t power = 0);

    void write_bytes(const uint8_t *buf, uint16_t count, bool power = 0);

    // Read a byte.
    uint8_t read(void);

    void read_bytes(uint8_t *buf, uint16_t count);

    // Write a bit. The bus is always left powered at the end, see
    // note in write() about that.
    void write_bit(uint8_t v);

    // Read a bit.
    uint8_t read_bit(void);

    // Stop forcing power onto the bus. You only need to do this if
    // you used the 'power' flag to write() or used a write_bit() call
    // and aren't about to do another read or write. You would rather
    // not leave this powered if you don't have to, just in case
    // someone shorts your bus.
    void depower(void);

#if ONEWIRE_SEARCH
    // Clear the search state so that if will start from the beginning again.
    void reset_search();

    // Setup the search to find the device type 'family_code' on the next call
    // to search(*newAddr) if it is present.
    void target_search(uint8_t family_code);

    // Look for the next device. Returns 1 if a new address has been
    // returned. A zero might mean that the bus is shorted, there are
    // no devices, or you have already retrieved all of them.  It
    // might be a good idea to check the CRC to make sure you didn't
    // get garbage.  The order is deterministic. You will always get
    // the same devices in the same order.
    uint8_t search(uint8_t *newAddr);
#endif

#if ONEWIRE_CRC
    // Compute a Dallas Semiconductor 8 bit CRC, these are used in the
    // ROM and scratchpad registers.
    static uint8_t crc8(uint8_t *addr, uint8_t len);

#if ONEWIRE_CRC16
    // Compute the 1-Wire CRC16 and compare it against the received CRC.
    // Example usage (reading a DS2408):
    //    // Put everything in a buffer so we can compute the CRC easily.
    //    uint8_t buf[13];
    //    buf[0] = 0xF0;    // Read PIO Registers
    //    buf[1] = 0x88;    // LSB address
    //    buf[2] = 0x00;    // MSB address
    //    WriteBytes(net, buf, 3);    // Write 3 cmd bytes
    //    ReadBytes(net, buf+3, 10);  // Read 6 data bytes, 2 0xFF, 2 CRC16
    //    if (!CheckCRC16(buf, 11, &buf[11])) {
    //        // Handle error.
    //    }
    //
    // @param input - Array of bytes to checksum.
    // @param len - How many bytes to use.
    // @param inverted_crc - The two CRC16 bytes in the received data.
    //                       This should just point into the received data,
    //                       *not* at a 16-bit integer.
    // @param crc - The crc starting value (optional)
    // @return True, iff the CRC matches.
    static bool check_crc16(const uint8_t* input, uint16_t len, const uint8_t* inverted_crc, uint16_t crc = 0);

    // Compute a Dallas Semiconductor 16 bit CRC.  This is required to check
    // the integrity of data received from many 1-Wire devices.  Note that the
    // CRC computed here is *not* what you'll get from the 1-Wire network,
    // for two reasons:
    //   1) The CRC is transmitted bitwise inverted.
    //   2) Depending on the endian-ness of your processor, the binary
    //      representation of the two-byte return value may have a different
    //      byte order than the two bytes you get from 1-Wire.
    // @param input - Array of bytes to checksum.
    // @param len - How many bytes to use.
    // @param crc - The crc starting value (optional)
    // @return The CRC16, as defined by Dallas Semiconductor.
    static uint16_t crc16(const uint8_t* input, uint16_t len, uint16_t crc = 0);
#endif
#endif
};

#endif

spark-dallas-temperature.cpp

// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.

// Version 3.7.2 modified on Dec 6, 2011 to support Arduino 1.0
// See Includes...
// Modified by Jordan Hochenbaum

// Modified by Tom de Boer @ 26-jun-2014 (Spark Core compatibility)

#include "spark-dallas-temperature.h"

DallasTemperature::DallasTemperature(OneWire* _oneWire)
#if REQUIRESALARMS
    : _AlarmHandler(&defaultAlarmHandler)
#endif
{
    _wire = _oneWire;
    devices = 0;
    parasite = false;
    bitResolution = 9;
    waitForConversion = true;
    checkForConversion = true;
}

// initialise the bus
void DallasTemperature::begin(void)
{
    DeviceAddress deviceAddress;

    for(int attempt = 0; attempt <= MAX_RETRIES; attempt++)
    {
        _wire->reset_search();
        devices = 0; // Reset the number of devices when we enumerate wire devices
    
        while (_wire->search(deviceAddress))
        {
            if (validAddress(deviceAddress))
            {
                if (!parasite && readPowerSupply(deviceAddress)) parasite = true;
    
                ScratchPad scratchPad;
    
                readScratchPad(deviceAddress, scratchPad);
    
                bitResolution = max(bitResolution, getResolution(deviceAddress));
    
                devices++;
            }
        }
        if (devices > 0)
            break; 
        //Serial1.println("ERR-begin");
        delay(10);
    }
}

// returns the number of devices found on the bus
uint8_t DallasTemperature::getDeviceCount(void)
{
    return devices;
}

// returns true if address is valid
bool DallasTemperature::validAddress(const uint8_t* deviceAddress)
{
    return (_wire->crc8((uint8_t*)deviceAddress, 7) == deviceAddress[7]);
}

// finds an address at a given index on the bus
// returns true if the device was found
bool DallasTemperature::getAddress(uint8_t* deviceAddress, uint8_t index)
{
    uint8_t depth = 0;

    _wire->reset_search();

    while (depth <= index && _wire->search(deviceAddress))
    {
        if (depth == index && validAddress(deviceAddress)) return true;
        depth++;
    }

    return false;
}

// void DallasTemperature::getAddressString(char szROM[]){
//     sprintf(szROM, "%X %X %X %X %X %X %X %X", addr[0], addr[1], addr[2], addr[3], addr[4], addr[5], addr[6], addr[7]);
// }

// attempt to determine if the device at the given address is connected to the bus
bool DallasTemperature::isConnected(const uint8_t* deviceAddress)
{
    ScratchPad scratchPad;
    return isConnected(deviceAddress, scratchPad);
}

// attempt to determine if the device at the given address is connected to the bus
// also allows for updating the read scratchpad
bool DallasTemperature::isConnected(const uint8_t* deviceAddress, uint8_t* scratchPad)
{
    readScratchPad(deviceAddress, scratchPad);
    return (_wire->crc8(scratchPad, 8) == scratchPad[SCRATCHPAD_CRC]);
}

// read device's scratch pad
void DallasTemperature::readScratchPad(const uint8_t* deviceAddress, uint8_t* scratchPad)
{
    // send the command
    _wire->reset();
    _wire->select(deviceAddress);
    _wire->write(READSCRATCH);

    // TODO => collect all comments &  use simple loop
    // byte 0: temperature LSB
    // byte 1: temperature MSB
    // byte 2: high alarm temp
    // byte 3: low alarm temp
    // byte 4: DS18S20: store for crc
    //         DS18B20 & DS1822: configuration register
    // byte 5: internal use & crc
    // byte 6: DS18S20: COUNT_REMAIN
    //         DS18B20 & DS1822: store for crc
    // byte 7: DS18S20: COUNT_PER_C
    //         DS18B20 & DS1822: store for crc
    // byte 8: SCRATCHPAD_CRC
    //
    // for(int i=0; i<9; i++)
    // {
    //   scratchPad[i] = _wire->read();
    // }


    // read the response

    // byte 0: temperature LSB
    scratchPad[TEMP_LSB] = _wire->read();

    // byte 1: temperature MSB
    scratchPad[TEMP_MSB] = _wire->read();

    // byte 2: high alarm temp
    scratchPad[HIGH_ALARM_TEMP] = _wire->read();

    // byte 3: low alarm temp
    scratchPad[LOW_ALARM_TEMP] = _wire->read();

    // byte 4:
    // DS18S20: store for crc
    // DS18B20 & DS1822: configuration register
    scratchPad[CONFIGURATION] = _wire->read();

    // byte 5:
    // internal use & crc
    scratchPad[INTERNAL_BYTE] = _wire->read();

    // byte 6:
    // DS18S20: COUNT_REMAIN
    // DS18B20 & DS1822: store for crc
    scratchPad[COUNT_REMAIN] = _wire->read();

    // byte 7:
    // DS18S20: COUNT_PER_C
    // DS18B20 & DS1822: store for crc
    scratchPad[COUNT_PER_C] = _wire->read();

    // byte 8:
    // SCTRACHPAD_CRC
    scratchPad[SCRATCHPAD_CRC] = _wire->read();

    _wire->reset();
}

// writes device's scratch pad
void DallasTemperature::writeScratchPad(const uint8_t* deviceAddress, const uint8_t* scratchPad)
{
    _wire->reset();
    _wire->select(deviceAddress);
    _wire->write(WRITESCRATCH);
    _wire->write(scratchPad[HIGH_ALARM_TEMP]); // high alarm temp
    _wire->write(scratchPad[LOW_ALARM_TEMP]); // low alarm temp
    // DS1820 and DS18S20 have no configuration register
    if (deviceAddress[0] != DS18S20MODEL) _wire->write(scratchPad[CONFIGURATION]); // configuration
    _wire->reset();
    _wire->select(deviceAddress); //<--this line was missing
    // save the newly written values to eeprom
    _wire->write(COPYSCRATCH, parasite);
    if (parasite) delay(10); // 10ms delay
    _wire->reset();
}

// reads the device's power requirements
bool DallasTemperature::readPowerSupply(const uint8_t* deviceAddress)
{
    bool ret = false;
    _wire->reset();
    _wire->select(deviceAddress);
    _wire->write(READPOWERSUPPLY);
    if (_wire->read_bit() == 0) ret = true;
    _wire->reset();
    return ret;
}


// set resolution of all devices to 9, 10, 11, or 12 bits
// if new resolution is out of range, it is constrained.
void DallasTemperature::setResolution(uint8_t newResolution)
{
    bitResolution = constrain(newResolution, 9, 12);
    DeviceAddress deviceAddress;
    for (int i=0; i<devices; i++)
    {
        getAddress(deviceAddress, i);
        setResolution(deviceAddress, bitResolution);
    }
}

// set resolution of a device to 9, 10, 11, or 12 bits
// if new resolution is out of range, 9 bits is used.
bool DallasTemperature::setResolution(const uint8_t* deviceAddress, uint8_t newResolution)
{
    ScratchPad scratchPad;
    if (isConnected(deviceAddress, scratchPad))
    {
        // DS1820 and DS18S20 have no resolution configuration register
        if (deviceAddress[0] != DS18S20MODEL)
        {
            switch (newResolution)
            {
            case 12:
                scratchPad[CONFIGURATION] = TEMP_12_BIT;
                break;
            case 11:
                scratchPad[CONFIGURATION] = TEMP_11_BIT;
                break;
            case 10:
                scratchPad[CONFIGURATION] = TEMP_10_BIT;
                break;
            case 9:
            default:
                scratchPad[CONFIGURATION] = TEMP_9_BIT;
                break;
            }
            writeScratchPad(deviceAddress, scratchPad);
        }
        return true;  // new value set
    }
    return false;
}

// returns the global resolution
uint8_t DallasTemperature::getResolution()
{
    return bitResolution;
}

// returns the current resolution of the device, 9-12
// returns 0 if device not found
uint8_t DallasTemperature::getResolution(const uint8_t* deviceAddress)
{
    // DS1820 and DS18S20 have no resolution configuration register
    if (deviceAddress[0] == DS18S20MODEL) return 12;

    ScratchPad scratchPad;
    if (isConnected(deviceAddress, scratchPad))
    {
        switch (scratchPad[CONFIGURATION])
        {
        case TEMP_12_BIT:
            return 12;

        case TEMP_11_BIT:
            return 11;

        case TEMP_10_BIT:
            return 10;

        case TEMP_9_BIT:
            return 9;
        }
    }
    return 0;
}


// sets the value of the waitForConversion flag
// TRUE : function requestTemperature() etc returns when conversion is ready
// FALSE: function requestTemperature() etc returns immediately (USE WITH CARE!!)
//        (1) programmer has to check if the needed delay has passed
//        (2) but the application can do meaningful things in that time
void DallasTemperature::setWaitForConversion(bool flag)
{
    waitForConversion = flag;
}

// gets the value of the waitForConversion flag
bool DallasTemperature::getWaitForConversion()
{
    return waitForConversion;
}


// sets the value of the checkForConversion flag
// TRUE : function requestTemperature() etc will 'listen' to an IC to determine whether a conversion is complete
// FALSE: function requestTemperature() etc will wait a set time (worst case scenario) for a conversion to complete
void DallasTemperature::setCheckForConversion(bool flag)
{
    checkForConversion = flag;
}

// gets the value of the waitForConversion flag
bool DallasTemperature::getCheckForConversion()
{
    return checkForConversion;
}

bool DallasTemperature::isConversionAvailable(const uint8_t* deviceAddress)
{
    // Check if the clock has been raised indicating the conversion is complete
    ScratchPad scratchPad;
    readScratchPad(deviceAddress, scratchPad);
    return scratchPad[0];
}


// sends command for all devices on the bus to perform a temperature conversion
void DallasTemperature::requestTemperatures()
{
    //Greg's method but may not be worthwhile
    // for(int attempt = 0; attempt <= MAX_RETRIES; attempt++)
    // {

    //     _wire->reset();
    //     _wire->skip();
    //     _wire->write(STARTCONVO, parasite);
    
    //     // ASYNC mode?
    //     if (!waitForConversion) return;
    //     blockTillConversionComplete(bitResolution, NULL);
    //     float temp = getTempFByIndex(0);
    //     //Serial1.println("debug temp: " + String(temp));
    //     if (temp != DEVICE_DISCONNECTED_F && temp != 0)
    //         break;
    //     //Serial1.println("ERR-bad temp");
    //     delay(10);
    // }
    
    //original method
    _wire->reset();
    _wire->skip();
    _wire->write(STARTCONVO, parasite);

    // ASYNC mode?
    if (!waitForConversion) return;
    blockTillConversionComplete(bitResolution, NULL);
}

// sends command for one device to perform a temperature by address
// returns FALSE if device is disconnected
// returns TRUE  otherwise
bool DallasTemperature::requestTemperaturesByAddress(const uint8_t* deviceAddress)
{
    _wire->reset();
    _wire->select(deviceAddress);
    _wire->write(STARTCONVO, parasite);

    // check device
    ScratchPad scratchPad;
    if (!isConnected(deviceAddress, scratchPad)) return false;

    // ASYNC mode?
    if (!waitForConversion) return true;
    blockTillConversionComplete(getResolution(deviceAddress), deviceAddress);

    return true;
}

// returns number of milliseconds to wait till conversion is complete (based on IC datasheet)
int16_t DallasTemperature::millisToWaitForConversion(uint8_t bitResolution)
{
    switch (bitResolution)
    {
    case 9:
        return 94;
    case 10:
        return 188;
    case 11:
        return 375;
    default:
        return 750;
    }
}

// Continue to check if the IC has responded with a temperature
void DallasTemperature::blockTillConversionComplete(uint8_t bitResolution, const uint8_t* deviceAddress)
{
    int delms = millisToWaitForConversion(bitResolution);
    if (deviceAddress != NULL && checkForConversion && !parasite)
    {
        unsigned long timend = millis() + delms;
        while(!isConversionAvailable(deviceAddress) && (millis() < timend));
    }
    else
    {
        delay(delms);
    }
}

// sends command for one device to perform a temp conversion by index
bool DallasTemperature::requestTemperaturesByIndex(uint8_t deviceIndex)
{
    DeviceAddress deviceAddress;
    getAddress(deviceAddress, deviceIndex);
    return requestTemperaturesByAddress(deviceAddress);
}

// Greg addition: requestTemperaturesByIndex + getTempFByIndex
float DallasTemperature::requestAndGetTempFByIndex(uint8_t deviceIndex)
{
    for(int attempt = 0; attempt <= MAX_RETRIES; attempt++)
    {

        _wire->reset();
        _wire->skip();
        _wire->write(STARTCONVO, parasite);
    
        blockTillConversionComplete(bitResolution, NULL);
        float temp = getTempFByIndex(deviceIndex);
        //Serial1.println("debug temp: " + String(temp));
        if (temp != DEVICE_DISCONNECTED_F && temp != 0)
            return temp;
        //Serial1.println("ERR-invalid temp");
        delay(10);
    }
    return DEVICE_DISCONNECTED_F;
}


// Fetch temperature for device index
float DallasTemperature::getTempCByIndex(uint8_t deviceIndex)
{
    DeviceAddress deviceAddress;
    if (!getAddress(deviceAddress, deviceIndex))
        return DEVICE_DISCONNECTED_C;
    return getTempC((uint8_t*)deviceAddress);
}

// Fetch temperature for device index
float DallasTemperature::getTempFByIndex(uint8_t deviceIndex)
{
    // Greg addition (for loop retry)
    for(int attempt = 0; attempt <= MAX_RETRIES; attempt++)
    {
        DeviceAddress deviceAddress;
        if (!getAddress(deviceAddress, deviceIndex))
            return DEVICE_DISCONNECTED_F;
        float temp = getTempF((uint8_t*)deviceAddress);
        if (temp != DEVICE_DISCONNECTED_F && temp != 0)
            return temp; 

        delay(10);
    }
    return DEVICE_DISCONNECTED_F;
}

// reads scratchpad and returns fixed-point temperature, scaling factor 2^-7
int16_t DallasTemperature::calculateTemperature(const uint8_t* deviceAddress, uint8_t* scratchPad)
{
    int16_t fpTemperature =
        (((int16_t) scratchPad[TEMP_MSB]) << 11) |
        (((int16_t) scratchPad[TEMP_LSB]) << 3);

    /*
    DS1820 and DS18S20 have a 9-bit temperature register.
    Resolutions greater than 9-bit can be calculated using the data from
    the temperature, and COUNT REMAIN and COUNT PER °C registers in the
    scratchpad.  The resolution of the calculation depends on the model.
    While the COUNT PER °C register is hard-wired to 16 (10h) in a
    DS18S20, it changes with temperature in DS1820.
    After reading the scratchpad, the TEMP_READ value is obtained by
    truncating the 0.5°C bit (bit 0) from the temperature data. The
    extended resolution temperature can then be calculated using the
    following equation:
                                    COUNT_PER_C - COUNT_REMAIN
    TEMPERATURE = TEMP_READ - 0.25 + --------------------------
                                            COUNT_PER_C
    Hagai Shatz simplified this to integer arithmetic for a 12 bits
    value for a DS18S20, and James Cameron added legacy DS1820 support.
    See - http://myarduinotoy.blogspot.co.uk/2013/02/12bit-result-from-ds18s20.html
    */

    if (deviceAddress[0] == DS18S20MODEL)
        fpTemperature = ((fpTemperature & 0xfff0) << 3) - 16 +
            (
                ((scratchPad[COUNT_PER_C] - scratchPad[COUNT_REMAIN]) << 7) /
                  scratchPad[COUNT_PER_C]
            );

    return fpTemperature;
}


// returns temperature in 1/128 degrees C or DEVICE_DISCONNECTED_RAW if the
// device's scratch pad cannot be read successfully.
// the numeric value of DEVICE_DISCONNECTED_RAW is defined in
// DallasTemperature.h. It is a large negative number outside the
// operating range of the device
int16_t DallasTemperature::getTemp(const uint8_t* deviceAddress)
{
    ScratchPad scratchPad;
    if (isConnected(deviceAddress, scratchPad)) return calculateTemperature(deviceAddress, scratchPad);
    return DEVICE_DISCONNECTED_RAW;
}

// returns temperature in degrees C or DEVICE_DISCONNECTED_C if the
// device's scratch pad cannot be read successfully.
// the numeric value of DEVICE_DISCONNECTED_C is defined in
// DallasTemperature.h. It is a large negative number outside the
// operating range of the device
float DallasTemperature::getTempC(const uint8_t* deviceAddress)
{
    return rawToCelsius(getTemp(deviceAddress));
}

// returns temperature in degrees F or DEVICE_DISCONNECTED_F if the
// device's scratch pad cannot be read successfully.
// the numeric value of DEVICE_DISCONNECTED_F is defined in
// DallasTemperature.h. It is a large negative number outside the
// operating range of the device
float DallasTemperature::getTempF(const uint8_t* deviceAddress)
{
    return rawToFahrenheit(getTemp(deviceAddress));
}

// returns true if the bus requires parasite power
bool DallasTemperature::isParasitePowerMode(void)
{
    return parasite;
}

#if REQUIRESALARMS

/*
ALARMS:
TH and TL Register Format
BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0
  S    2^6   2^5   2^4   2^3   2^2   2^1   2^0
Only bits 11 through 4 of the temperature register are used
in the TH and TL comparison since TH and TL are 8-bit
registers. If the measured temperature is lower than or equal
to TL or higher than or equal to TH, an alarm condition exists
and an alarm flag is set inside the DS18B20. This flag is
updated after every temperature measurement; therefore, if the
alarm condition goes away, the flag will be turned off after
the next temperature conversion.
*/

// sets the high alarm temperature for a device in degrees Celsius
// accepts a float, but the alarm resolution will ignore anything
// after a decimal point.  valid range is -55C - 125C
void DallasTemperature::setHighAlarmTemp(const uint8_t* deviceAddress, char celsius)
{
    // make sure the alarm temperature is within the device's range
    if (celsius > 125) celsius = 125;
    else if (celsius < -55) celsius = -55;

    ScratchPad scratchPad;
    if (isConnected(deviceAddress, scratchPad))
    {
        scratchPad[HIGH_ALARM_TEMP] = (uint8_t)celsius;
        writeScratchPad(deviceAddress, scratchPad);
    }
}

// sets the low alarm temperature for a device in degrees Celsius
// accepts a float, but the alarm resolution will ignore anything
// after a decimal point.  valid range is -55C - 125C
void DallasTemperature::setLowAlarmTemp(const uint8_t* deviceAddress, char celsius)
{
    // make sure the alarm temperature is within the device's range
    if (celsius > 125) celsius = 125;
    else if (celsius < -55) celsius = -55;

    ScratchPad scratchPad;
    if (isConnected(deviceAddress, scratchPad))
    {
        scratchPad[LOW_ALARM_TEMP] = (uint8_t)celsius;
        writeScratchPad(deviceAddress, scratchPad);
    }
}

// returns a char with the current high alarm temperature or
// DEVICE_DISCONNECTED for an address
char DallasTemperature::getHighAlarmTemp(const uint8_t* deviceAddress)
{
    ScratchPad scratchPad;
    if (isConnected(deviceAddress, scratchPad)) return (char)scratchPad[HIGH_ALARM_TEMP];
    return DEVICE_DISCONNECTED_C;
}

// returns a char with the current low alarm temperature or
// DEVICE_DISCONNECTED for an address
char DallasTemperature::getLowAlarmTemp(const uint8_t* deviceAddress)
{
    ScratchPad scratchPad;
    if (isConnected(deviceAddress, scratchPad)) return (char)scratchPad[LOW_ALARM_TEMP];
    return DEVICE_DISCONNECTED_C;
}

// resets internal variables used for the alarm search
void DallasTemperature::resetAlarmSearch()
{
    alarmSearchJunction = -1;
    alarmSearchExhausted = 0;
    for(uint8_t i = 0; i < 7; i++)
        alarmSearchAddress[i] = 0;
}

// This is a modified version of the OneWire::search method.
//
// Also added the OneWire search fix documented here:
// http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1238032295
//
// Perform an alarm search. If this function returns a '1' then it has
// enumerated the next device and you may retrieve the ROM from the
// OneWire::address variable. If there are no devices, no further
// devices, or something horrible happens in the middle of the
// enumeration then a 0 is returned.  If a new device is found then
// its address is copied to newAddr.  Use
// DallasTemperature::resetAlarmSearch() to start over.
bool DallasTemperature::alarmSearch(uint8_t* newAddr)
{
    uint8_t i;
    char lastJunction = -1;
    uint8_t done = 1;

    if (alarmSearchExhausted) return false;
    if (!_wire->reset()) return false;

    // send the alarm search command
    _wire->write(0xEC, 0);

    for(i = 0; i < 64; i++)
    {
        uint8_t a = _wire->read_bit( );
        uint8_t nota = _wire->read_bit( );
        uint8_t ibyte = i / 8;
        uint8_t ibit = 1 << (i & 7);

        // I don't think this should happen, this means nothing responded, but maybe if
        // something vanishes during the search it will come up.
        if (a && nota) return false;

        if (!a && !nota)
        {
            if (i == alarmSearchJunction)
            {
                // this is our time to decide differently, we went zero last time, go one.
                a = 1;
                alarmSearchJunction = lastJunction;
            }
            else if (i < alarmSearchJunction)
            {
                // take whatever we took last time, look in address
                if (alarmSearchAddress[ibyte] & ibit) a = 1;
                else
                {
                    // Only 0s count as pending junctions, we've already exhausted the 0 side of 1s
                    a = 0;
                    done = 0;
                    lastJunction = i;
                }
            }
            else
            {
                // we are blazing new tree, take the 0
                a = 0;
                alarmSearchJunction = i;
                done = 0;
            }
            // OneWire search fix
            // See: http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1238032295
        }

        if (a) alarmSearchAddress[ibyte] |= ibit;
        else alarmSearchAddress[ibyte] &= ~ibit;

        _wire->write_bit(a);
    }

    if (done) alarmSearchExhausted = 1;
    for (i = 0; i < 8; i++) newAddr[i] = alarmSearchAddress[i];
    return true;
}

// returns true if device address might have an alarm condition
// (only an alarm search can verify this)
bool DallasTemperature::hasAlarm(const uint8_t* deviceAddress)
{
    ScratchPad scratchPad;
    if (isConnected(deviceAddress, scratchPad))
    {
        char temp = calculateTemperature(deviceAddress, scratchPad) >> 7;

        // check low alarm
        if (temp <= (char)scratchPad[LOW_ALARM_TEMP]) return true;

        // check high alarm
        if (temp >= (char)scratchPad[HIGH_ALARM_TEMP]) return true;
    }

    // no alarm
    return false;
}

// returns true if any device is reporting an alarm condition on the bus
bool DallasTemperature::hasAlarm(void)
{
    DeviceAddress deviceAddress;
    resetAlarmSearch();
    return alarmSearch(deviceAddress);
}

// runs the alarm handler for all devices returned by alarmSearch()
void DallasTemperature::processAlarms(void)
{
    resetAlarmSearch();
    DeviceAddress alarmAddr;

    while (alarmSearch(alarmAddr))
    {
        if (validAddress(alarmAddr))
            _AlarmHandler(alarmAddr);
    }
}

// sets the alarm handler
void DallasTemperature::setAlarmHandler(AlarmHandler *handler)
{
    _AlarmHandler = handler;
}

// The default alarm handler
void DallasTemperature::defaultAlarmHandler(const uint8_t* deviceAddress)
{
}

#endif

// Convert float Celsius to Fahrenheit
float DallasTemperature::toFahrenheit(float celsius)
{
    return (celsius * 1.8) + 32;
}

// Convert float Fahrenheit to Celsius
float DallasTemperature::toCelsius(float fahrenheit)
{
    return (fahrenheit - 32) * 0.555555556;
}

// convert from raw to Celsius
float DallasTemperature::rawToCelsius(int16_t raw)
{
    if (raw <= DEVICE_DISCONNECTED_RAW)
        return DEVICE_DISCONNECTED_C;
    // C = RAW/128
    return (float)raw * 0.0078125;
}

// convert from raw to Fahrenheit
float DallasTemperature::rawToFahrenheit(int16_t raw)
{
    if (raw <= DEVICE_DISCONNECTED_RAW)
        return DEVICE_DISCONNECTED_F;
    // C = RAW/128
    // F = (C*1.8)+32 = (RAW/128*1.8)+32 = (RAW*0.0140625)+32
    return ((float)raw * 0.0140625) + 32;
}

#if REQUIRESNEW

// MnetCS - Allocates memory for DallasTemperature. Allows us to instance a new object
void* DallasTemperature::operator new(unsigned int size) // Implicit NSS obj size
{
    void * p; // void pointer
    p = malloc(size); // Allocate memory
    memset((DallasTemperature*)p,0,size); // Initialise memory

    //!!! CANT EXPLICITLY CALL CONSTRUCTOR - workaround by using an init() methodR - workaround by using an init() method
    return (DallasTemperature*) p; // Cast blank region to NSS pointer
}

// MnetCS 2009 -  Free the memory used by this instance
void DallasTemperature::operator delete(void* p)
{
    DallasTemperature* pNss =  (DallasTemperature*) p; // Cast to NSS pointer
    pNss->~DallasTemperature(); // Destruct the object

    free(p); // Free the memory
}

#endif

spark-dallas-temperature.h

#ifndef DallasTemperature_h
#define DallasTemperature_h

//Do retries internally
#define MAX_RETRIES 5

#define DALLASTEMPLIBVERSION "3.7.3"

// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.

// set to true to include code for new and delete operators
#ifndef REQUIRESNEW
#define REQUIRESNEW false
#endif

// set to true to include code implementing alarm search functions
#ifndef REQUIRESALARMS
#define REQUIRESALARMS false
#endif

#include <inttypes.h>

//#if defined(ARDUINO) && ARDUINO >= 100
//    #include <OneWire.h>
//#elif defined(SPARK) or defined(STM32F10X_MD)
    #include "application.h"
    #include "OneWire.h"
//#endif


// Model IDs
#define DS18S20MODEL 0x10  // also DS1820
#define DS18B20MODEL 0x28
#define DS1822MODEL  0x22
#define DS1825MODEL  0x3B

// OneWire commands
#define STARTCONVO      0x44  // Tells device to take a temperature reading and put it on the scratchpad
#define COPYSCRATCH     0x48  // Copy EEPROM
#define READSCRATCH     0xBE  // Read EEPROM
#define WRITESCRATCH    0x4E  // Write to EEPROM
#define RECALLSCRATCH   0xB8  // Reload from last known
#define READPOWERSUPPLY 0xB4  // Determine if device needs parasite power
#define ALARMSEARCH     0xEC  // Query bus for devices with an alarm condition

// Scratchpad locations
#define TEMP_LSB        0
#define TEMP_MSB        1
#define HIGH_ALARM_TEMP 2
#define LOW_ALARM_TEMP  3
#define CONFIGURATION   4
#define INTERNAL_BYTE   5
#define COUNT_REMAIN    6
#define COUNT_PER_C     7
#define SCRATCHPAD_CRC  8

// Device resolution
#define TEMP_9_BIT  0x1F //  9 bit
#define TEMP_10_BIT 0x3F // 10 bit
#define TEMP_11_BIT 0x5F // 11 bit
#define TEMP_12_BIT 0x7F // 12 bit

// Error Codes
#define DEVICE_DISCONNECTED_C -127
#define DEVICE_DISCONNECTED_F -196
#define DEVICE_DISCONNECTED_RAW -7040

typedef uint8_t DeviceAddress[8];

class DallasTemperature
{
  public:

  DallasTemperature(OneWire*);

  // initialise bus
  void begin(void);

  // returns the number of devices found on the bus
  uint8_t getDeviceCount(void);
  
  // returns true if address is valid
  bool validAddress(const uint8_t*);

  // finds an address at a given index on the bus 
  bool getAddress(uint8_t*, uint8_t);

  // finds an address at a given index on the bus 
  //void getAddressString(char szROM[], uint8_t);
  
  // attempt to determine if the device at the given address is connected to the bus
  bool isConnected(const uint8_t*);

  // attempt to determine if the device at the given address is connected to the bus
  // also allows for updating the read scratchpad
  bool isConnected(const uint8_t*, uint8_t*);

  // read device's scratchpad
  void readScratchPad(const uint8_t*, uint8_t*);

  // write device's scratchpad
  void writeScratchPad(const uint8_t*, const uint8_t*);

  // read device's power requirements
  bool readPowerSupply(const uint8_t*);

  // get global resolution
  uint8_t getResolution();
  
  // set global resolution to 9, 10, 11, or 12 bits
  void setResolution(uint8_t);

  // returns the device resolution: 9, 10, 11, or 12 bits
  uint8_t getResolution(const uint8_t*);

  // set resolution of a device to 9, 10, 11, or 12 bits
  bool setResolution(const uint8_t*, uint8_t);
  
  // sets/gets the waitForConversion flag
  void setWaitForConversion(bool);
  bool getWaitForConversion(void);
  
  // sets/gets the checkForConversion flag
  void setCheckForConversion(bool);
  bool getCheckForConversion(void);
  
  // sends command for all devices on the bus to perform a temperature conversion 
  void requestTemperatures(void);
   
  // sends command for one device to perform a temperature conversion by address
  bool requestTemperaturesByAddress(const uint8_t*);

  // sends command for one device to perform a temperature conversion by index
  bool requestTemperaturesByIndex(uint8_t);

  // Greg addition: requestTemperaturesByIndex + getTempFByIndex
  float requestAndGetTempFByIndex(uint8_t);

  // returns temperature raw value (12 bit integer of 1/16 degrees C)
  int16_t getTemp(const uint8_t*);

  // returns temperature in degrees C
  float getTempC(const uint8_t*);

  // returns temperature in degrees F
  float getTempF(const uint8_t*);

  // Get temperature for device index (slow)
  float getTempCByIndex(uint8_t);
  
  // Get temperature for device index (slow)
  float getTempFByIndex(uint8_t);
  
  // returns true if the bus requires parasite power
  bool isParasitePowerMode(void);
  
  bool isConversionAvailable(const uint8_t*);

  #if REQUIRESALARMS
  
  typedef void AlarmHandler(const uint8_t*);

  // sets the high alarm temperature for a device
  // accepts a char.  valid range is -55C - 125C
  void setHighAlarmTemp(const uint8_t*, char);

  // sets the low alarm temperature for a device
  // accepts a char.  valid range is -55C - 125C
  void setLowAlarmTemp(const uint8_t*, char);

  // returns a signed char with the current high alarm temperature for a device
  // in the range -55C - 125C
  char getHighAlarmTemp(const uint8_t*);

  // returns a signed char with the current low alarm temperature for a device
  // in the range -55C - 125C
  char getLowAlarmTemp(const uint8_t*);
  
  // resets internal variables used for the alarm search
  void resetAlarmSearch(void);

  // search the wire for devices with active alarms
  bool alarmSearch(uint8_t*);

  // returns true if ia specific device has an alarm
  bool hasAlarm(const uint8_t*);

  // returns true if any device is reporting an alarm on the bus
  bool hasAlarm(void);

  // runs the alarm handler for all devices returned by alarmSearch()
  void processAlarms(void);
  
  // sets the alarm handler
  void setAlarmHandler(const AlarmHandler *);
  
  // The default alarm handler
  static void defaultAlarmHandler(const uint8_t*);

  #endif

  // convert from Celsius to Fahrenheit
  static float toFahrenheit(float);

  // convert from Fahrenheit to Celsius
  static float toCelsius(float);

  // convert from raw to Celsius
  static float rawToCelsius(int16_t);

  // convert from raw to Fahrenheit
  static float rawToFahrenheit(int16_t);

  #if REQUIRESNEW

  // initialize memory area
  void* operator new (unsigned int);

  // delete memory reference
  void operator delete(void*);
  
  #endif

  private:
  typedef uint8_t ScratchPad[9];
  
  // parasite power on or off
  bool parasite;

  // used to determine the delay amount needed to allow for the
  // temperature conversion to take place
  uint8_t bitResolution;
  
  // used to requestTemperature with or without delay
  bool waitForConversion;
  
  // used to requestTemperature to dynamically check if a conversion is complete
  bool checkForConversion;
  
  // count of devices on the bus
  uint8_t devices;
  
  // Take a pointer to one wire instance
  OneWire* _wire;

  // reads scratchpad and returns the raw temperature
  int16_t calculateTemperature(const uint8_t*, uint8_t*);
  
  int16_t millisToWaitForConversion(uint8_t);

  void  blockTillConversionComplete(uint8_t, const uint8_t*);
  
  #if REQUIRESALARMS

  // required for alarmSearch 
  uint8_t alarmSearchAddress[8];
  char alarmSearchJunction;
  uint8_t alarmSearchExhausted;

  // the alarm handler function pointer
  AlarmHandler *_AlarmHandler;

  #endif
  
};
#endif