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This implies that the last byte of the 1-Wire address (the CRC) is 0x3d Indeed, this agrees with the output from Listing 44 If we run the example again with the CRC byte included
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The preceding two example outputs suggest the two different approaches that an application may use to check a CRC value that it computes against the CRC value read from the device It can either compute the CRC of all of the data up to the CRC byte(s) and then check that the resulting value is identical to the CRC returned by the device, or it can compute the CRC of all of the data including the CRC byte(s) returned by the device and check the computed CRC for a value of 016
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All methods that perform address searches in the API automatically check the address CRC before returning an address to the caller When a CRC check fails, the search result is discarded Several 1-Wire devices automatically generate CRCs on various elds as they are being queried or updated In these cases the container implementation for that family is responsible for checking the CRC before successfully returning to the caller If the CRC fails, a OneWireIOException is thrown to indicate that the operation failed Applications that use 1-Wire memory devices for data storage and retrieval should be sure to protect their data using the 16-bit CRC (CRC-16)
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16 Note that the CRC-16 value is often stored bit-wise inverted (ones complement) Computing the CRC-16 including the inverted CRC16 value results in a nal value of 0xB001 (as opposed to 0)
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TINI s main objective is to provide a powerful platform for developing small embedded applications that connect non-networked devices to the network TINI s broad networking is its most compelling feature, and Java s suitability for writing networked applications is one of the primary reasons TINI provides a Java runtime environment Java supports basic network access using classes in the javanet package Since TINI provides a full implementation of the javanet package, many network applications written in Java will run on TINI without modi cation However, there are differences between developing a network application for a PC or workstation and a dedicated network application for TINI These differences come from the fundamental nature of programming for embedded networking devices For example, con guring the network parameters on general purpose computers or workstations is not handled programmatically as a part of your application However, in the embedded world, if your application assumes control of the entire system, then it must be capable of con guring the network as well as using it This chapter assumes a strong familiarity with writing networked applications in Java It is not intended to be a general treatment of TCP/IP networking or writing network applications in Java There are many excellent books that cover both of these subjects in detail Rather, this chapter focuses primarily on programming for TINI s networking environment
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TINI NETWORKING ENVIRONMENT AND API OVERVIEW
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A diagram of the networking environment is shown in Figure 51 The gure displays the following six application layer protocols that are supported in the API HTTP (Hypertext Transfer Protocol) DNS (Domain Name System) DHCP (Dynamic Host Con guration Protocol) Telnet FTP (File Transfer Protocol) Ping (ICMP echo request/reply)
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All of the application layer protocols except Ping are implemented using the socket classes in the javanet package as the network transport mechanism Ping isn t really a protocol It s an application wrapper over a subset of ICMP (Internet Control Message Protocol) The Ping class, covered in Section 55, directly invokes native methods that are exposed in the network stack s ICMP module Support for most of the application layer protocols is provided by the subpackages of comdalsemitininet comdalsemitininethttp comdalsemitinineticmp comdalsemitininetdhcp comdalsemitininetdns
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We ll cover TINI s API for these protocols in detail in the next few sections The FTP and Telnet protocols are implemented in the comdalsemishellserverftp and comdalsemishellservertelnet packages, respectively Both FTP and Telnet are implemented as servers and are typically only used by system shells such as slush Support for using FTP as a client is of course available using the URL classes in the javanet package The protocols in Figure 51 are those for which the TINI networking API provides special support Other networking protocols can and have been written in Java and can run on TINI with little or no change to the code Examples include both servers and clients for network time and SNMP (Simple Network Management Protocol) Also, there is no reason that the protocol support provided in the networking API cannot be extended or possibly even replaced by third-party implementations Parameters speci c to the various network interfaces can be queried or con gured using the TININet class in the comdalsemitininet package TININet also provides methods for setting global networking parameters such as the host and domain name Network con guration is covered in Section 52
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