The 1-Wire Net in Java

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The 1-Wire Net
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CONTAINERS
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The container classes provide high-level access to the services offered by speci c families of devices, shielding the programmer from low-level details of possibly complicated communication protocols Consider, for example, the DS18S20 temperature sensor device In Section 412 we detailed the two 1-Wire transactions required to obtain a temperature For most development purposes we would probably want something as simple as a method that returns a oating point representation of the current temperature rather than worrying about the details of sending and receiving the set of 1-wire commands and data speci ed in Tables 41 and 42
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The Class OneWireContainer
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The OneWireContainer class, de ned in the comdalsemionewirecontainer package, is the superclass of all device speci c containers and implements default fuctionality that is shared by all 1-Wire devices, speci cally the address It also provides methods for identifying and describing the devices in a textual form All 1-Wire device families are represented by a subclass of OneWireContainer and also exist in the comdalsemionewirecontainer package The name of the container is simply a hexadecimal string representation of the device family id appended to OneWireContainer s fully quali ed class name For example, devices with a family id 0x10 are represented by the container class OneWireContainer10 The formation of a container class name is done in this fashion to allow instances of device speci c container classes to be created as they are discovered on the 1-Wire network This is discussed in more detail in the next section An instance of OneWireContainer (or a subclass) maintains a reference to its parent adapter that is used for all communication with the device OneWireContainer methods use the techniques described in Section 43 for sending and receiving commands and data to and from the underlying device
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Creating Container Instances
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OneWireContainer
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objects are created by invoking any of the following methods on an instance of a subclass of DSPortAdapter
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public OneWireContainer getFirstDeviceContainer() throws OneWireIOException, OneWireException public OneWireContainer getNextDeviceContainer()
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Containers
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throws OneWireIOException, OneWireException public Enumeration getAllDeviceContainers() throws OneWireIOException, OneWireException
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methods that create container objects use forName and of class Class The string passed to forName to get the Class object is created by appending an uppercase, hexadecimal String representation of the device s family id to the String representation of the fully quali ed name of OneWireContainer: comdalsemionewirecontainerOneWireContainer The Census example in Listing 44 used the methods findFirstDevice and findNextDevice to display all devices on the network We can use the methods getFirstDeviceContainer and getNextDeviceContainer to nd the same devices in the same order, but instead of just returning a boolean result, getFirstDeviceContainer and getNextDeviceContainer return OneWireContainer objects representing the devices found during the discovery process Listing 49 is essentially the same as Listing 47 except it uses getFirstDevice and getNextDevice to obtain device containers Once we have containers, we can print out more information speci c to the chips discovered during the search, as opposed to just each chip s address
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DSPortAdapter newInstance
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Listing 49
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import import import import
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FindContainers
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comdalsemionewireOneWireAccessProvider; comdalsemionewireOneWireException; comdalsemionewirecontainerOneWireContainer; comdalsemionewireadapterDSPortAdapter;
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class FindContainers { public static void main(String[] args) { DSPortAdapter adapter = null; try { adapter = OneWireAccessProvidergetDefaultAdapter(); adapterbeginExclusive(true); adaptersetSpeed(adapterSPEED_REGULAR); OneWireContainer owc = null; if ((owc = adaptergetFirstDeviceContainer()) != null) { Systemoutprintln(owcgetName()+","+ owcgetAlternateNames() + " at address "+ owcgetAddressAsString()); while ((owc=adaptergetNextDeviceContainer()) != null) { Systemoutprintln(owcgetName()+","+ owcgetAlternateNames() + " at address "+ owcgetAddressAsString()); } } } catch (OneWireException owe) { Systemoutprintln(owegetMessage());
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The 1-Wire Net
} finally { adapterendExclusive(); } } }
Running FindContainers on the same 1-Wire network as Listing 47 outputs each chip s address as well as a short description and formal part name
DS2406,Dual Addressable Switch at address F300000018A4BC12 DS2406,Dual Addressable Switch at address 8F00000018A37A12 DS2406,Dual Addressable Switch at address AD00000018A51612 DS2406,Dual Addressable Switch at address D600000018A37912 DS1921,Thermochron at address 3D34C00000609F21
Note that on TINI, device speci c container classes are not available by default as part of the API They must be included with the application during the conversion process (see Section 142) In Listing 49, OneWireContainer12 and OneWireContainer21 were both included during the conversion process for FindContainers On large systems with no practical memory constraints, it is reasonable to assume that all device speci c containers will be available Finally, OneWireContainer objects can also be created directly in the event that the application somehow knows a device s address without going through the discovery process In this case the application can create a OneWireContainer object using the container s default constructor and invoking one of the setupContainer methods on the newly created container All setupContainer methods require an adapter to be used for device communication and the device s address
public void setupContainer(DSPortAdapter sourceAdapter, byte[] newAddress) public void setupContainer(DSPortAdapter sourceAdapter, long newAddress) public void setupContainer(DSPortAdapter sourceAdapter, String newAddress)