Rxtx Java Example
To access the contents of the library in your project, make sure to import com.fazecast.jSerialComm.* into your java files. You can then generate a list of all available serial ports on your system (real or virtual), by calling the following static method:
Rxtx Java Example
For a description of the various modes of operation available in this library, please refer to the Modes of Operation wiki article. For code-based examples of how to use this library in your own project, we provide a Usage Examples wiki.
The problem is that there seems to be an intermingling of the data read and written to the two ports. For example, a test byte-stream coming on port 1, will have some of the characters on the SerialReader of port 2 as well. Similarly, when I use the SerialWriter tp write some bytes to Port 1, I find that some (if not all of them) are being written on the SerialWriter of Port 2.
The official RXTX wiki has some good examples. Below is an adaption I made with the explicit goal of being short and to the point. See the official examples for better error handling and other use cases.
The following class has two methods: Use getSerialPorts() to get a List of detected serial ports. Then call establishConnection() to make a connection and create the input/output streams. For example, calling establishConnection("/dev/ttyUSB0", 9600); would connect to /dev/ttyUSB0 with a 9600 8N1 configuration. I also setup a Scanner to make it trivial to parse incoming data.
This archive contains code examples that communicate with the CANdapter using RxTx ( ). Note: Code comes with no warranty whatsoever. Use at own risk.The following example programs are included:Simple Prius DTC Checker
This module examines both JavaComm and RxTx. It predominantly centres around exhibiting ideas, not prepared to-run code. The individuals who need to indiscriminately duplicate code have alluded to the example code that accompanies the bundles. The people who need to understand what they are doing could discover some valuable data in this module.
Numerous Linux disseminations offer an RxTx bundle in their vaults (ArchLinux - 'java-rxtx', Debian/Ubuntu - 'librxtx-java'). These packages incorporate just the stage-explicit pieces of the library. However, they are, by and large, prepared to utilize.
JavaComm is famous on the grounds that it requires a record called javax.comm.properties to be set in the JDK lib directory, something which isn't possible with Java WebStart. This is especially miserable on the grounds that the requirement for that record is the consequence of some pointless plan/choice in JavaComm and might have handily been kept away from by the JavaComm originators. Sun continually won't right this mistake. It is crucial to refer to the system. This is, they are telling a blatant lie with regards to JavaComm, specific since Java, for quite a while, has a specialist organization engineering precisely planned for such purposes.
To begin with, switch off the security chief. Some goofball developer at Sun concluded that it would be cool to over and over check for the presence of the feared javax.comm.properties record, even after it has been stacked at first, for reasons unknown than checking for the document.
Further, RxTx has an example matching calculation for recognizing "substantial" sequential gadget names. This frequently breaks things when one needs to utilize non-standard gadgets, such as USB-to-chronic converters. This component can be abrogated by framework properties. See the RxTx establishment guidance for subtleties.
jSerialComm as opposed to both RxTx and JavaComm is prepared to use on many working Frameworks and Stages (for example, Windows x86/x86_64, Linux x86/x86_64, ARM, and even android - full rundown in the particular library container) with practically no changes. Anyway, it actually needs consent to get to the device.
The Programming interface utilizes a callback component to illuminate the developer about recently showing up information. It is likewise smart to concentrate on this component as opposed to depending on surveying the port. In contrast to other callback interfaces in Java (for example, in the GUI), this one just permits one audience paying attention to occasions. In the event that numerous audience members expect to pay attention to sequential occasions, the one essential audience must be executed such that it dispatches the data to other auxiliary audience members.
The Windows variant of JavaComm is, as of now, not authoritatively accessible, and Sun has - against their own item end-of-live strategy - not made it accessible in the Java items document In any case, the 2.0 Windows adaptation (javacom 2.0) is as yet downloadable from here
When the product is introduced, inspecting the examples and JavaDoc directories is suggested. It's a good idea to construct and run one of the example applications to check that the establishment is right. The example applications ordinarily need a minor transformation to run on a specific stage (for example, changes to the hard-coded com port identifiers).
It is smart to have some sequential equipment, such as cabling, an invalid modem, a breakout box, a genuine modem, PABX and others accessible while evaluating an example application. Serial_Programming: RS-232 Associations and Serial_Programming: Modems and AT Orders give some data on the most proficient method to set up the equipment part of a sequential application improvement climate.
When trying to run the XBee Java example at +your+first+XBee+Java+application with nrjavaserial, the following error appeared: Exception in thread "main" java.lang.NoSuchMethodError:gnu.io.CommPortIdentifier.open(Ljava/lang/String;I)Lgnu/io/CommPort; atcom.digi.xbee.api.connection.serial.SerialPortRxTx.open(SerialPortRxTx.java:167) at com.digi.xbee.api.XBeeDevice.open(XBeeDevice.java:195) at ptolemy.actor.lib.jjs.modules.xbee.XBeeHello.main(XBeeHello.java:20) [$[Get Code]]
# # A fatal error has been detected by the Java Runtime Environment: # # SIGSEGV (0xb) at pc=0x00007f500625cd9d, pid=1551, tid=139981668689664 # # JRE version: 6.0_37-b06 # Java VM: Java HotSpot(TM) 64-Bit Server VM (20.12-b01 mixed mode linux-amd64 compressed oops) # Problematic frame: # C [librxtxSerial.so+0x6d9d] long double restrict+0x3d # # If you would like to submit a bug report, please visit: # # The crash happened outside the Java Virtual Machine in native code. # See problematic frame for where to report the bug. # --------------- T H R E A D --------------- Current thread (0x00007f5038291800): JavaThread "CommPortOpen Demo" [_thread_in_native, id=1591, stack(0x00007f5005932000,0x00007f5005a33000)] siginfo:si_signo=SIGSEGV: si_errno=0, si_code=1 (SEGV_MAPERR), si_addr=0x0000000006254838 Registers: RAX=0x0000000006254830, RBX=0x00007f4fe4000900, RCX=0x0000000000000001, RDX=0x00007f503f19a000 RSP=0x00007f5005a31410, RBP=0x00007f50382919d0, RSI=0x00007f500625fb25, RDI=0x00007f500625fa9f R8 =0x0000000000000ffc, R9 =0x00007f503e620c98, R10=0x00007f503e624b38, R11=0x00007f503e6182e0 R12=0xffffffffffffffff, R13=0x0000000000000010, R14=0x0000000000000009, R15=0x00000000ffffffff RIP=0x00007f500625cd9d, EFLAGS=0x0000000000010202, CSGSFS=0x002b000000000033, ERR=0x0000000000000004 TRAPNO=0x000000000000000e Top of Stack: (sp=0x00007f5005a31410) 0x00007f5005a31410: 0000000000000000 0000000000000000 0x00007f5005a31420: 0000001000000000 00007f4fe4000900 0x00007f5005a31430: 0000000900000000 0000000000000000 0x00007f5005a31440: 0000000000000000 0000000000000000 0x00007f5005a31450: 000000000000ff00 0000000006254830 0x00007f5005a31460: 00ffffff00000000 00000000ff0000ff 0x00007f5005a31470: 2e6d657400000000 616c007373616c63 0x00007f5005a31480: 0000000000000000 0000000000000000 0x00007f5005a31490: 00007f5038291800 0000000000000020 0x00007f5005a314a0: 00007f5005a314c0 00007f503e28fb38 0x00007f5005a314b0: 000000000000000c 00007f5005a31618 0x00007f5005a314c0: 00007f5005a31520 00007f503e09a0cb 0x00007f5005a314d0: 00007f4fe4000900 00007f4fe4000900 0x00007f5005a314e0: 0000000000000009 00007f5005a31540 0x00007f5005a314f0: 00007f50382919d0 00007f4fe4000900 0x00007f5005a31500: 00007f50382919d0 ffffffffffffffff 0x00007f5005a31510: 0000000000000010 0000000000000009 0x00007f5005a31520: 0000000000000000 00007f500625d272 0x00007f5005a31530: 00007f5038291800 00007f5005a31618 0x00007f5005a31540: 00007f5005a31620 00000000dd486448 0x00007f5005a31550: 00007f5005a315e8 0000000000000000 0x00007f5005a31560: 00000000dd486440 00007f5005a31620 0x00007f5005a31570: 00007f5038291800 00007f5035010eee 0x00007f5005a31580: 00007f5005a31688 00007f5005a31608 0x00007f5005a31590: 00007f50080013a0 00007f5008001778 0x00007f5005a315a0: 00007f5038291800 00007f5005a315a8 0x00007f5005a315b0: 00000000dd486440 00007f5005a31620 0x00007f5005a315c0: 00000000dd490648 0000000000000000 0x00007f5005a315d0: 00000000dd486448 0000000000000000 0x00007f5005a315e0: 00007f5005a31608 00007f5005a31688 0x00007f5005a315f0: 00007f503500596e 0000000000000000 0x00007f5005a31600: 00007f503500df56 0000000000000010 Instructions: (pc=0x00007f500625cd9d) 0x00007f500625cd7d: 4c 24 18 48 8d 15 17 2d 00 00 48 8d 0d 0e 2d 00 0x00007f500625cd8d: 00 44 89 44 24 14 e8 88 c7 ff ff 48 89 44 24 48 0x00007f500625cd9d: 8b 40 08 45 85 ff 48 8b 54 24 48 89 44 24 40 c7 0x00007f500625cdad: 42 08 00 00 00 00 0f 88 bd 01 00 00 31 c0 e8 70 Register to memory mapping: RAX=0x0000000006254830 is an unknown value RBX=0x00007f4fe4000900 is an unknown value RCX=0x0000000000000001 is an unknown value RDX=0x00007f503f19a000 is an unknown value RSP=0x00007f5005a31410 is pointing into the stack for thread: 0x00007f5038291800 RBP=0x00007f50382919d0 is an unknown value RSI=0x00007f500625fb25: in /usr/local/java/jre1.6.0_37/lib/x86_64/librxtxSerial.so at 0x00007f5006256000 RDI=0x00007f500625fa9f: in /usr/local/java/jre1.6.0_37/lib/x86_64/librxtxSerial.so at 0x00007f5006256000 R8 =0x0000000000000ffc is an unknown value R9 =0x00007f503e620c98: in /usr/local/java/jre1.6.0_37/lib/amd64/server/libjvm.so at 0x00007f503db86000 R10=0x00007f503e624b38: in /usr/local/java/jre1.6.0_37/lib/amd64/server/libjvm.so at 0x00007f503db86000 R11=0x00007f503e6182e0: in /usr/local/java/jre1.6.0_37/lib/amd64/server/libjvm.so at 0x00007f503db86000 R12=0xffffffffffffffff is an unknown value R13=0x0000000000000010 is an unknown value R14=0x0000000000000009 is an unknown value R15=0x00000000ffffffff is an unallocated location in the heap Stack: [0x00007f5005932000,0x00007f5005a33000], sp=0x00007f5005a31410, free space=1021k Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code) C [librxtxSerial.so+0x6d9d] long double restrict+0x3d Java frames: (J=compiled Java code, j=interpreted, Vv=VM code) j gnu.io.RXTXPort.readArray([BII)I+0 j gnu.io.RXTXPort$SerialInputStream.read([BII)I+212 J java2d.panels.CommPortOpen.receiveData()V J java2d.panels.CommPortOpen.step(II)V J java2d.AnimatingSurface.run()V j java.lang.Thread.run()V+11 v StubRoutines::call_stub --------------- P R O C E S S --------------- Java Threads: ( => current thread ) 0x00007f5038007800 JavaThread "DestroyJavaVM" [_thread_blocked, id=1552, stack(0x00007f503d77c000,0x00007f503d87d000)] 0x00007f50382b0000 JavaThread "TimerQueue" daemon [_thread_blocked, id=1606, stack(0x00007f50049c6000,0x00007f5004ac7000)] 0x00007f50382ae000 JavaThread "DataRowShort 33 Tbup Demo" [_thread_blocked, id=1605, stack(0x00007f5004ac7000,0x00007f5004bc8000)] 0x00007f50382ac000 JavaThread "DataRowShort 28 Trig Demo" [_thread_blocked, id=1604, stack(0x00007f5004bc8000,0x00007f5004cc9000)] 0x00007f50382aa000 JavaThread "DrawAlarm35 Demo" [_thread_blocked, id=1603, stack(0x00007f5004cc9000,0x00007f5004dca000)] 0x00007f4fe4003000 JavaThread "AWT-EventQueue-0" [_thread_blocked, id=1602, stack(0x00007f5004dca000,0x00007f5004ecb000)] 0x00007f50382a8000 JavaThread "DataRow 31 Vmin Demo" [_thread_blocked, id=1601, stack(0x00007f5004ecb000,0x00007f5004fcc000)] 0x00007f4fe4001000 JavaThread "AWT-Shutdown" [_thread_blocked, id=1600, stack(0x00007f5004fcc000,0x00007f50050cd000)] 0x00007f50382a6000 JavaThread "DataRow 30 Vte Demo" [_thread_blocked, id=1599, stack(0x00007f50050cd000,0x00007f50051ce000)] 0x00007f50382a4000 JavaThread "DataRow 23 FiO2 Demo" [_thread_blocked, id=1598, stack(0x00007f50051ce000,0x00007f50052cf000)] 0x00007f50382a2000 JavaThread "DataRow 22 PEEP Demo" [_thread_blocked, id=1597, stack(0x00007f50052cf000,0x00007f50053d0000)] 0x00007f50382a0000 JavaThread "DataRow 21 PIP Demo" [_thread_blocked, id=1596, stack(0x00007f50053d0000,0x00007f50054d1000)] 0x00007f503829e000 JavaThread "BottomPanel42 Demo" [_thread_blocked, id=1595, stack(0x00007f50054d1000,0x00007f50055d2000)] 0x00007f503829c000 JavaThread "DrawVol37 Demo" [_thread_blocked, id=1594, stack(0x00007f50055d2000,0x00007f50056d3000)] 0x00007f503829b000 JavaThread "DrawFlow38 Demo" [_thread_blocked, id=1593, stack(0x00007f50056d3000,0x00007f50057d4000)] 0x00007f5038297000 JavaThread "DrawPaw36 Demo" [_thread_blocked, id=1592, stack(0x00007f50057d4000,0x00007f50058d5000)] =>0x00007f5038291800 JavaThread "CommPortOpen Demo" [_thread_in_native, id=1591, stack(0x00007f5005932000,0x00007f5005a33000)] 0x00007f503826f800 JavaThread "Thread-2" [_thread_blocked, id=1568, stack(0x00007f5006054000,0x00007f5006155000)] 0x00007f50381bf000 JavaThread "Thread-1" [_thread_in_native, id=1567, stack(0x00007f5006155000,0x00007f5006256000)] 0x00007f50381af000 JavaThread "AWT-XAWT" daemon [_thread_in_native, id=1566, stack(0x00007f500656a000,0x00007f500666b000)] 0x00007f5038146800 JavaThread "Java2D Disposer" daemon [_thread_blocked, id=1565, stack(0x00007f5006c85000,0x00007f5006d86000)] 0x00007f5038091800 JavaThread "Low Memory Detector" daemon [_thread_blocked, id=1563, stack(0x00007f503431b000,0x00007f503441c000)] 0x00007f503808f000 JavaThread "C2 CompilerThread1" daemon [_thread_blocked, id=1562, stack(0x00007f503441c000,0x00007f503451d000)] 0x00007f503808c800 JavaThread "C2 CompilerThread0" daemon [_thread_blocked, id=1561, stack(0x00007f503451d000,0x00007f503461e000)] 0x00007f503808a000 JavaThread "Signal Dispatcher" daemon [_thread_blocked, id=1560, stack(0x00007f503461e000,0x00007f503471f000)] 0x00007f503806d800 JavaThread "Finalizer" daemon [_thread_blocked, id=1559, stack(0x00007f50349fa000,0x00007f5034afb000)] 0x00007f503806b800 JavaThread "Reference Handler" daemon [_thread_blocked, id=1558, stack(0x00007f5034afb000,0x00007f5034bfc000)] Other Threads: 0x00007f5038065000 VMThread [stack: 0x00007f5034bfc000,0x00007f5034cfd000] [id=1557] 0x00007f50380a4000 WatcherThread [stack: 0x00007f503421a000,0x00007f503431b000] [id=1564] VM state:not at safepoint (normal execution) VM Mutex/Monitor currently owned by a thread: None Heap PSYoungGen total 53504K, used 31394K [0x00000000f5f60000, 0x00000000f9e20000, 0x0000000100000000) eden space 46208K, 67% used [0x00000000f5f60000,0x00000000f7d9c818,0x00000000f8c80000) from space 7296K, 5% used [0x00000000f9700000,0x00000000f976c010,0x00000000f9e20000) to space 9024K, 0% used [0x00000000f8c80000,0x00000000f8c80000,0x00000000f9550000) PSOldGen total 30080K, used 16131K [0x00000000e1e00000, 0x00000000e3b60000, 0x00000000f5f60000) object space 30080K, 53% used [0x00000000e1e00000,0x00000000e2dc0e70,0x00000000e3b60000) PSPermGen total 21248K, used 13306K [0x00000000dcc00000, 0x00000000de0c0000, 0x00000000e1e00000) object space 21248K, 62% used [0x00000000dcc00000,0x00000000dd8febf0,0x00000000de0c0000) Code Cache [0x00007f5035000000, 0x00007f5035270000, 0x00007f5038000000) total_blobs=720 nmethods=282 adapters=392 free_code_cache=49168128 largest_free_block=6848 Dynamic libraries: 40000000-40009000 r-xp 00000000 08:01 536192 /usr/local/java/jre1.6.0_37/bin/java 40108000-4010a000 rwxp 00008000 08:01 536192 /usr/local/java/jre1.6.0_37/bin/java 40422000-40443000 rwxp 00000000 00:00 0 [heap] dcc00000-de0c0000 rwxp 00000000 00:00 0 de0c0000-e1e00000 rwxp 00000000 00:00 0 e1e00000-e3b60000 rwxp 00000000 00:00 0 e3b60000-f5f60000 rwxp 00000000 00:00 0 f5f60000-f9e20000 rwxp 00000000 00:00 0 f9e20000-fa020000 ---p 00000000 00:00 0 fa020000-100000000 rwxp 00000000 00:00 0 7f4fb4000000-7f4fb4021000 rwxp 00000000 00:00 0 7f4fb4021000-7f4fb8000000 ---p 00000000 00:00 0 7f4fbc000000-7f4fbc021000 rwxp 00000000 00:00 0 7f4fbc021000-7f4fc0000000 ---p 00000000 00:00 0 7f4fc0000000-7f4fc01d8000 rwxp 00000000 00:00 0 7f4fc01d8000-7f4fc4000000 ---p 00000000 00:00 0 7f4fc4000000-7f4fc4021000 rwxp 00000000 00:00 0 7f4fc4021000-7f4fc8000000 ---p 00000000 00:00 0 7f4fc8000000-7f4fc8021000 rwxp 00000000 00:00 0 7f4fc8021000-7f4fcc000000 ---p 00000000 00:00 0 7f4fcc000000-7f4fcc021000 rwxp 00000000 00:00 0 7f4fcc021000-7f4fd0000000 ---p 00000000 00:00 0 7f4fd0000000-7f4fd0021000 rwxp 00000000 00:00 0 7f4fd0021000-7f4fd4000000 ---p 00000000 00:00 0 7f4fd4000000-7f4fd4021000 rwxp 00000000 00:00 0 7f4fd4021000-7f4fd8000000 ---p 00000000 00:00 0 7f4fd8000000-7f4fd8021000 rwxp 00000000 00:00 0 7f4fd8021000-7f4fdc000000 ---p 00000000 00:00 0 7f4fdc000000-7f4fdc021000 rwxp 00000000 00:00 0 7f4fdc021000-7f4fe0000000 ---p 00000000 00:00 0 7f4fe0000000-7f4fe0021000 rwxp 00000000 00:00 0 7f4fe0021000-7f4fe4000000 ---p 00000000 00:00 0 7f4fe4000000-7f4fe4021000 rwxp 00000000 00:00 0 7f4fe4021000-7f4fe8000000 ---p 00000000 00:00 0 7f4fe8000000-7f4fe8021000 rwxp 00000000 00:00 0 7f4fe8021000-7f4fec000000 ---p 00000000 00:00 0 7f4fec000000-7f4fec024000 rwxp 00000000 00:00 0 7f4fec024000-7f4ff0000000 ---p 00000000 00:00 0 7f4ff0000000-7f4ff0072000 rwxp 00000000 00:00 0 7f4ff0072000-7f4ff4000000 ---p 00000000 00:00 0 7f4ff4000000-7f4ff4021000 rwxp 00000000 00:00 0 7f4ff4021000-7f4ff8000000 ---p 00000000 00:00 0 7f4ff8000000-7f4ff8021000 rwxp 00000000 00:00 0 7f4ff8021000-7f4ffc000000 ---p 00000000 00:00 0 7f4ffc000000-7f4ffc021000 rwxp 00000000 00:00 0 7f4ffc021000-7f5000000000 ---p 00000000 00:00 0 7f5000000000-7f5000021000 rwxp 00000000 00:00 0 7f5000021000-7f5004000000 ---p 00000000 00:00 0 7f5004744000-7f5004747000 ---p 00000000 00:00 0 7f5004747000-7f5004845000 rwxp 00000000 00:00 0 7f5004845000-7f50048c5000 rwxs 00000000 00:05 2064391 /SYSV00000000 (deleted) 7f50048c5000-7f50048c8000 ---p 00000000 00:00 0 7f50048c8000-7f50049c6000 rwxp 00000000 00:00 0 7f50049c6000-7f50049c9000 ---p 00000000 00:00 0 7f50049c9000-7f5004ac7000 rwxp 00000000 00:00 0 7f5004ac7000-7f5004aca000 ---p 00000000 00:00 0 7f5004aca000-7f5004bc8000 rwxp 00000000 00:00 0 7f5004bc8000-7f5004