com.dalsemi.onewire.container
Class OneWireContainer28

java.lang.Object
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  +--com.dalsemi.onewire.container.OneWireContainer
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        +--com.dalsemi.onewire.container.OneWireContainer28

All Implemented Interfaces:

OneWireSensor, TemperatureContainer

public class OneWireContainer28

extends OneWireContainer

implements TemperatureContainer

1-Wire container for temperature iButton which measures temperatures from -55°C to +125°C, DS18B20. This container encapsulates the functionality of the iButton family type 28 (hex)

Features

• Measures temperatures from -55°C to +125°C. Fahrenheit equivalent is -67°F to +257°F
• Power supply range is 3.0V to 5.5V
• Zero standby power
• +/- 0.5°C accuracy from -10°C to +85°C
• Thermometer resolution programmable from 9 to 12 bits
• Converts 12-bit temperature to digital word in 750 ms (max.)
• User-definable, nonvolatile temperature alarm settings
• Alarm search command identifies and addresses devices whose temperature is outside of programmed limits (temperature alarm condition)

Usage

See the usage example in TemperatureContainer for temperature specific operations.

DataSheet

http://pdfserv.maxim-ic.com/arpdf/DS18B20.pdf

Version:

1.00, 15 September 2000

See Also:

TemperatureContainer

Field Summary

static byte	CONVERT_TEMPERATURE_COMMAND DS18B20 converts temperature command
static byte	COPY_SCRATCHPAD_COMMAND DS18B20 copys data from scratchpad to E-squared memory command
static byte	READ_POWER_SUPPLY_COMMAND DS18B20 reads power supply command.
static byte	READ_SCRATCHPAD_COMMAND DS18B20 reads data from scratchpad command
static byte	RECALL_E2MEMORY_COMMAND DS18B20 recalls E-squared memory command
static byte	RESOLUTION_10_BIT DS18B20 10-bit resolution constant for CONFIG byte
static byte	RESOLUTION_11_BIT DS18B20 11-bit resolution constant for CONFIG byte
static byte	RESOLUTION_12_BIT DS18B20 12-bit resolution constant for CONFIG byte
static byte	RESOLUTION_9_BIT DS18B20 9-bit resolution constant for CONFIG byte
static byte	WRITE_SCRATCHPAD_COMMAND DS18B20 writes data to scratchpad command

Fields inherited from interface com.dalsemi.onewire.container.TemperatureContainer

ALARM_HIGH, ALARM_LOW

Constructor Summary

OneWireContainer28()
Creates an empty OneWireContainer28.

OneWireContainer28(DSPortAdapter sourceAdapter, byte[] newAddress)
Creates a OneWireContainer28 with the provided adapter object and the address of this One-Wire device.

OneWireContainer28(DSPortAdapter sourceAdapter, long newAddress)
Creates a OneWireContainer28 with the provided adapter object and the address of this One-Wire device.

OneWireContainer28(DSPortAdapter sourceAdapter, String newAddress)
Creates a OneWireContainer28 with the provided adapter object and the address of this One-Wire device.

Method Summary

float	convertToFahrenheit(float celsiusTemperature) Converts a temperature reading from Celsius to Fahrenheit.
void	copyScratchpad() Copies the Scratchpad to the E-squared memory of the DS18B20.
void	doTemperatureConvert(byte[] state) Performs a temperature conversion on state information.
String	getAlternateNames() Retrieves the alternate Dallas Semiconductor part numbers or names.
String	getDescription() Retrieves a short description of the function of this OneWireContainer28 type.
double	getMaxTemperature() Gets the maximum temperature in Celsius.
double	getMinTemperature() Gets the minimum temperature in Celsius.
String	getName() Retrieves the Dallas Semiconductor part number of this OneWireContainer28 as a String.
double	getTemperature(byte[] state) Gets the temperature value in Celsius from the state data retrieved from the readDevice() method.
double	getTemperatureAlarm(int alarmType, byte[] state) Gets the specified temperature alarm value in Celsius from the state data retrieved from the readDevice() method.
double	getTemperatureAlarmResolution() Gets the temperature alarm resolution in Celsius.
double	getTemperatureResolution(byte[] state) Gets the current temperature resolution in Celsius from the state data retrieved from the readDevice() method.
double[]	getTemperatureResolutions() Gets an array of available temperature resolutions in Celsius.
boolean	hasSelectableTemperatureResolution() Checks to see if this device has selectable temperature resolution.
boolean	hasTemperatureAlarms() Checks to see if this temperature measuring device has high/low trip alarms.
boolean	isExternalPowerSupplied() Reads the way power is supplied to the DS18B20.
byte[]	readDevice() Retrieves this OneWireContainer28 state information.
byte[]	readScratchpad() Reads the Scratchpad of the DS18B20.
byte[]	recallE2() Recalls the DS18B20 temperature trigger values (ALARM_HIGH and ALARM_LOW) and the configuration register to the scratchpad and reads the scratchpad.
void	setTemperatureAlarm(int alarmType, double alarmValue, byte[] state) Sets the temperature alarm value in Celsius in the provided state data.
void	setTemperatureResolution(double resolution, byte[] state) Sets the current temperature resolution in Celsius in the provided state data.
void	writeDevice(byte[] state) Writes to this OneWireContainer28 state information that have been changed by 'set' methods.
void	writeScratchpad(byte[] data) Writes to the Scratchpad of the DS18B20.

Methods inherited from class com.dalsemi.onewire.container.OneWireContainer

doSpeed, getAdapter, getAddress, getAddressAsLong, getAddressAsString, getMaxSpeed, getMemoryBanks, isAlarming, isPresent, setSpeed, setupContainer, setupContainer, setupContainer

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

WRITE_SCRATCHPAD_COMMAND

public static final byte WRITE_SCRATCHPAD_COMMAND

DS18B20 writes data to scratchpad command

READ_SCRATCHPAD_COMMAND

public static final byte READ_SCRATCHPAD_COMMAND

DS18B20 reads data from scratchpad command

COPY_SCRATCHPAD_COMMAND

public static final byte COPY_SCRATCHPAD_COMMAND

DS18B20 copys data from scratchpad to E-squared memory command

CONVERT_TEMPERATURE_COMMAND

public static final byte CONVERT_TEMPERATURE_COMMAND

DS18B20 converts temperature command

RECALL_E2MEMORY_COMMAND

public static final byte RECALL_E2MEMORY_COMMAND

DS18B20 recalls E-squared memory command

READ_POWER_SUPPLY_COMMAND

public static final byte READ_POWER_SUPPLY_COMMAND

DS18B20 reads power supply command. This command is used to determine if external power is supplied.

RESOLUTION_12_BIT

public static final byte RESOLUTION_12_BIT

DS18B20 12-bit resolution constant for CONFIG byte

RESOLUTION_11_BIT

public static final byte RESOLUTION_11_BIT

DS18B20 11-bit resolution constant for CONFIG byte

RESOLUTION_10_BIT

public static final byte RESOLUTION_10_BIT

DS18B20 10-bit resolution constant for CONFIG byte

RESOLUTION_9_BIT

public static final byte RESOLUTION_9_BIT

DS18B20 9-bit resolution constant for CONFIG byte

Constructor Detail

OneWireContainer28

public OneWireContainer28()

Creates an empty OneWireContainer28. Must call setupContainer() before using this new container.

This is one of the methods to construct a OneWireContainer28. The others are through creating a OneWireContainer28 with parameters.

See Also:

OneWireContainer28(DSPortAdapter,byte[]), OneWireContainer28(DSPortAdapter,long), OneWireContainer28(DSPortAdapter,String)

OneWireContainer28

public OneWireContainer28(DSPortAdapter sourceAdapter,
                          byte[] newAddress)

Creates a OneWireContainer28 with the provided adapter object and the address of this One-Wire device. This is one of the methods to construct a OneWireContainer28. The others are through creating a OneWireContainer28 with different parameters types.

Parameters:

sourceAdapter - adapter object required to communicate with this One-Wire device

newAddress - address of this One-Wire device

See Also:

Address, OneWireContainer28(), OneWireContainer28(DSPortAdapter,long), OneWireContainer28(DSPortAdapter,String)

OneWireContainer28

public OneWireContainer28(DSPortAdapter sourceAdapter,
                          long newAddress)

Creates a OneWireContainer28 with the provided adapter object and the address of this One-Wire device. This is one of the methods to construct a OneWireContainer28. The others are through creating a OneWireContainer28 with different parameters types.

Parameters:

sourceAdapter - adapter object required to communicate with this One-Wire device

newAddress - address of this One-Wire device

See Also:

Address, OneWireContainer28(), OneWireContainer28(DSPortAdapter,byte[]), OneWireContainer28(DSPortAdapter,String)

OneWireContainer28

public OneWireContainer28(DSPortAdapter sourceAdapter,
                          String newAddress)

Creates a OneWireContainer28 with the provided adapter object and the address of this One-Wire device. This is one of the methods to construct a OneWireContainer28. The others are through creating a OneWireContainer28 with different parameters types.

Parameters:

sourceAdapter - adapter object required to communicate with this One-Wire device

newAddress - address of this One-Wire device

See Also:

Address, OneWireContainer28(), OneWireContainer28(DSPortAdapter,byte[]), OneWireContainer28(DSPortAdapter,long)

Method Detail

getName

public String getName()

Retrieves the Dallas Semiconductor part number of this OneWireContainer28 as a String. For example 'DS18B20'.

Overrides:

getName in class OneWireContainer

Returns:

this OneWireContainer28 name

getAlternateNames

public String getAlternateNames()

Retrieves the alternate Dallas Semiconductor part numbers or names. A 'family' of 1-Wire Network devices may have more than one part number depending on packaging. There can also be nicknames such as 'Crypto iButton'.

Overrides:

getAlternateNames in class OneWireContainer

Returns:

this OneWireContainer28 alternate names

getDescription

public String getDescription()

Retrieves a short description of the function of this OneWireContainer28 type.

Overrides:

getDescription in class OneWireContainer

Returns:

OneWireContainer28 functional description

hasTemperatureAlarms

public boolean hasTemperatureAlarms()

Checks to see if this temperature measuring device has high/low trip alarms.

Specified by:

hasTemperatureAlarms in interface TemperatureContainer

Returns:

true if this OneWireContainer28 has high/low trip alarms

See Also:

getTemperatureAlarm(int, byte[]), setTemperatureAlarm(int, double, byte[])

hasSelectableTemperatureResolution

public boolean hasSelectableTemperatureResolution()

Checks to see if this device has selectable temperature resolution.

Specified by:

hasSelectableTemperatureResolution in interface TemperatureContainer

Returns:

true if this OneWireContainer28 has selectable temperature resolution

See Also:

getTemperatureResolution(byte[]), getTemperatureResolutions(), setTemperatureResolution(double, byte[])

getTemperatureResolutions

public double[] getTemperatureResolutions()

Gets an array of available temperature resolutions in Celsius.

Specified by:

getTemperatureResolutions in interface TemperatureContainer

Returns:

byte array of available temperature resolutions in Celsius for this OneWireContainer28. The minimum resolution is returned as the first element and maximum resolution as the last element.

See Also:

hasSelectableTemperatureResolution(), getTemperatureResolution(byte[]), setTemperatureResolution(double, byte[])

getTemperatureAlarmResolution

public double getTemperatureAlarmResolution()

Gets the temperature alarm resolution in Celsius.

Specified by:

getTemperatureAlarmResolution in interface TemperatureContainer

Returns:

temperature alarm resolution in Celsius for this OneWireContainer28

See Also:

hasTemperatureAlarms(), getTemperatureAlarm(int, byte[]), setTemperatureAlarm(int, double, byte[])

getMaxTemperature

public double getMaxTemperature()

Gets the maximum temperature in Celsius.

Specified by:

getMaxTemperature in interface TemperatureContainer

Returns:

maximum temperature in Celsius for this OneWireContainer28

See Also:

getMinTemperature()

getMinTemperature

public double getMinTemperature()

Gets the minimum temperature in Celsius.

Specified by:

getMinTemperature in interface TemperatureContainer

Returns:

minimum temperature in Celsius for this OneWireContainer28

See Also:

getMaxTemperature()

doTemperatureConvert

public void doTemperatureConvert(byte[] state)
                          throws OneWireIOException,
                                 OneWireException

Performs a temperature conversion on state information.

Specified by:

doTemperatureConvert in interface TemperatureContainer

Parameters:

state - byte array with device state information

Throws:

OneWireIOException - on a 1-Wire communication error such as reading an incorrect CRC from this OneWireContainer28. This could be caused by a physical interruption in the 1-Wire Network due to shorts or a newly arriving 1-Wire device issuing a 'presence pulse'.

OneWireException - on a communication or setup error with the 1-Wire adapter

See Also:

getTemperature(byte[])

getTemperature

public double getTemperature(byte[] state)
                      throws OneWireIOException

Gets the temperature value in Celsius from the state data retrieved from the readDevice() method.

Specified by:

getTemperature in interface TemperatureContainer

Parameters:

state - byte array with device state information for this OneWireContainer28

Returns:

temperature in Celsius from the last doTemperatureConvert()

Throws:

OneWireIOException - on a 1-Wire communication error such as reading an incorrect CRC from this OneWireContainer28. This could be caused by a physical interruption in the 1-Wire Network due to shorts or a newly arriving 1-Wire device issuing a 'presence pulse'.

See Also:

doTemperatureConvert(byte[])

getTemperatureAlarm

public double getTemperatureAlarm(int alarmType,
                                  byte[] state)

Gets the specified temperature alarm value in Celsius from the state data retrieved from the readDevice() method.

Specified by:

getTemperatureAlarm in interface TemperatureContainer

Parameters:

alarmType - valid value: ALARM_HIGH or ALARM_LOW

state - byte array with device state information

Returns:

temperature alarm trip values in Celsius for this OneWireContainer28

See Also:

hasTemperatureAlarms(), setTemperatureAlarm(int, double, byte[])

getTemperatureResolution

public double getTemperatureResolution(byte[] state)

Gets the current temperature resolution in Celsius from the state data retrieved from the readDevice() method.

Specified by:

getTemperatureResolution in interface TemperatureContainer

Parameters:

state - byte array with device state information

Returns:

temperature resolution in Celsius for this OneWireContainer28

See Also:

RESOLUTION_9_BIT, RESOLUTION_10_BIT, RESOLUTION_11_BIT, RESOLUTION_12_BIT, hasSelectableTemperatureResolution(), getTemperatureResolutions(), setTemperatureResolution(double, byte[])

setTemperatureAlarm

public void setTemperatureAlarm(int alarmType,
                                double alarmValue,
                                byte[] state)
                         throws OneWireException,
                                OneWireIOException

Sets the temperature alarm value in Celsius in the provided state data. Use the method writeDevice() with this data to finalize the change to the device.

Specified by:

setTemperatureAlarm in interface TemperatureContainer

Parameters:

alarmType - valid value: ALARM_HIGH or ALARM_LOW

alarmValue - alarm trip value in Celsius

state - byte array with device state information

See Also:

hasTemperatureAlarms(), getTemperatureAlarm(int, byte[])

setTemperatureResolution

public void setTemperatureResolution(double resolution,
                                     byte[] state)
                              throws OneWireException

Sets the current temperature resolution in Celsius in the provided state data. Use the method writeDevice() with this data to finalize the change to the device.

Specified by:

setTemperatureResolution in interface TemperatureContainer

Parameters:

resolution - temperature resolution in Celsius. Valid values are RESOLUTION_9_BIT, RESOLUTION_10_BIT, RESOLUTION_11_BIT and RESOLUTION_12_BIT.

state - byte array with device state information

See Also:

RESOLUTION_9_BIT, RESOLUTION_10_BIT, RESOLUTION_11_BIT, RESOLUTION_12_BIT, hasSelectableTemperatureResolution(), getTemperatureResolution(byte[]), getTemperatureResolutions()

readDevice

public byte[] readDevice()
                  throws OneWireIOException,
                         OneWireException

Retrieves this OneWireContainer28 state information. The state information is returned as a byte array. Pass this byte array to the 'get' and 'set' methods. If the device state needs to be changed, then call the writeDevice() to finalize the changes.

Specified by:

readDevice in interface OneWireSensor

Returns:

OneWireContainer28 state information. Device state looks like this:

   0 : temperature LSB 
   1 : temperature MSB
   2 : trip high
   3 : trip low
   4 : configuration register (for resolution)
   5 : reserved
   6 : reserved
   7 : reserved
   8 : an 8 bit CRC of the previous 8 bytes
 

Throws:

OneWireIOException - on a 1-Wire communication error such as reading an incorrect CRC from this OneWireContainer28. This could be caused by a physical interruption in the 1-Wire Network due to shorts or a newly arriving 1-Wire device issuing a 'presence pulse'.

OneWireException - on a communication or setup error with the 1-Wire adapter

See Also:

writeDevice(byte[])

writeDevice

public void writeDevice(byte[] state)
                 throws OneWireIOException,
                        OneWireException

Writes to this OneWireContainer28 state information that have been changed by 'set' methods. Only the state registers that changed are updated. This is done by referencing a field information appended to the state data.

Specified by:

writeDevice in interface OneWireSensor

Parameters:

state - byte array with device state information

Throws:

OneWireIOException - on a 1-Wire communication error such as reading an incorrect CRC from this OneWireContainer28. This could be caused by a physical interruption in the 1-Wire Network due to shorts or a newly arriving 1-Wire device issuing a 'presence pulse'.

OneWireException - on a communication or setup error with the 1-Wire adapter

See Also:

readDevice()

readScratchpad

public byte[] readScratchpad()
                      throws OneWireIOException,
                             OneWireException

Reads the Scratchpad of the DS18B20.

Returns:

9-byte buffer representing the scratchpad

Throws:

OneWireIOException - on a 1-Wire communication error such as reading an incorrect CRC from this OneWireContainer28. This could be caused by a physical interruption in the 1-Wire Network due to shorts or a newly arriving 1-Wire device issuing a 'presence pulse'.

OneWireException - on a communication or setup error with the 1-Wire adapter

writeScratchpad

public void writeScratchpad(byte[] data)
                     throws OneWireIOException,
                            OneWireException

Writes to the Scratchpad of the DS18B20.

Parameters:

data - data to be written to the scratchpad. First byte of data must be the temperature High Trip Point, the second byte must be the temperature Low Trip Point, and the third must be the Resolution (configuration register).

Throws:

OneWireIOException - on a 1-Wire communication error such as reading an incorrect CRC from this OneWireContainer28. This could be caused by a physical interruption in the 1-Wire Network due to shorts or a newly arriving 1-Wire device issuing a 'presence pulse'.

OneWireException - on a communication or setup error with the 1-Wire adapter

IllegalArgumentException - when data is of invalid length

copyScratchpad

public void copyScratchpad()
                    throws OneWireIOException,
                           OneWireException

Copies the Scratchpad to the E-squared memory of the DS18B20.

Throws:

OneWireIOException - on a 1-Wire communication error such as reading an incorrect CRC from this OneWireContainer28. This could be caused by a physical interruption in the 1-Wire Network due to shorts or a newly arriving 1-Wire device issuing a 'presence pulse'.

OneWireException - on a communication or setup error with the 1-Wire adapter

recallE2

public byte[] recallE2()
                throws OneWireIOException,
                       OneWireException

Recalls the DS18B20 temperature trigger values (ALARM_HIGH and ALARM_LOW) and the configuration register to the scratchpad and reads the scratchpad.

Returns:

byte array representing data in the device's scratchpad.

Throws:

OneWireIOException - on a 1-Wire communication error such as reading an incorrect CRC from this OneWireContainer28. This could be caused by a physical interruption in the 1-Wire Network due to shorts or a newly arriving 1-Wire device issuing a 'presence pulse'.

OneWireException - on a communication or setup error with the 1-Wire adapter

isExternalPowerSupplied

public boolean isExternalPowerSupplied()
                                throws OneWireIOException,
                                       OneWireException

Reads the way power is supplied to the DS18B20.

Returns:

true for external power,
false for parasite power

Throws:

OneWireIOException - on a 1-Wire communication error such as reading an incorrect CRC from this OneWireContainer28. This could be caused by a physical interruption in the 1-Wire Network due to shorts or a newly arriving 1-Wire device issuing a 'presence pulse'.

OneWireException - on a communication or setup error with the 1-Wire adapter

convertToFahrenheit

public float convertToFahrenheit(float celsiusTemperature)

Converts a temperature reading from Celsius to Fahrenheit.

Parameters:

celsiusTemperature - temperature value in Celsius

Returns:

the Fahrenheit conversion of the supplied temperature