rm5248 / javaserial Goto Github PK

Is there a way to receive an event when a device is connected (plugged in) or do I need to poll - periodically call SerialPort.getSerialPorts()?

I noticed the other day that an IOException can be thrown by certain methods, but on the Java side the methods are not declared as throwing an IOException.

We have a few options:

• Declare all methods to throw IOException
• Don't throw IOException?

Related to not throwing IOException, we can throw an IOException if we mess up something on the JNI side - if we can't find our handle we will throw an IOException, whereas we should really throw something like BadProgrammingException(subclass of RuntimeException).

Only the first result can be obtained,100% cpu usage, and the program will get stuck.The same is true for another open source project jSerialComm

orangepi zero url:http://www.orangepi.org/html/hardWare/computerAndMicrocontrollers/details/Orange-Pi-Zero.html

when you send data,this JavaSerial sometime will receive 4 time as i send.
like:
when send AA BB CC . it will receive AA BB CC AA BB CC AA BB CC AA BB CC 。mostly ,when set 128 bytes recve buffer .it will fill ful of that buffer with AA BB CC....

When closing a SerialPort, the thread that is currently reading the port will come back with an IOException. This occurs at least on Windows using a BufferedSerialInputStream, but not using a SimpleSerialInputStream.

Also, when closing a serialport that is using a SimpleSerialInputStream, a 0 gets returned when the serial port closes - it should be -1, as that is what an InputStream uses to say that there is an EOF.

On Windows, the control line state( DTR and RTS ) is a static variable, so if there are multiple serial ports open then when the state of one line changes they will all change.

The native code for Linux ARM does not work on the raspberry pi. It fails with a SIGILL. Probably because the arch was set to be a v7 ARM processor, while the pi appears to only be v6 compatible.

Is there a way to enumerate the serial ports on the system? I would like my app to find the correct serial port without user engagement.

I have no idea what the names of the serial ports could be. Better to find all and analyze each one to see which one is correct.

Thanks

Is there a way to enumerate the serial ports on the system? I would like my app to find the correct serial port without user engagement.

I have no idea what the names of the serial ports could be. Better to find all and analyze each one to see which one is correct.

I see an answer 'yes' and then closed. Not helpful. From the Javadoc API there is no clear way to do it.

In the jserialComm library there is a method

SerialPort.getCommPorts()

where I do not have to provide a name (which I do not know).

Add 19200 baud rate to supported baud rates on the Java side.

The native code supports it, but for some reason it's not in our enum on supported baud rates.

Socat can be used to create a serial port(pty) on Linux. When this is the case, we will fail to open up the serial port properly, as getSerialLineStateInternalNonblocking throws an error, presumably because TIOCMGET is not implemented on these ports.

See also: https://stackoverflow.com/questions/14830739/where-is-tiocmget-supposed-to-be-implemented

Complete solution is working perfectly fine in my local windows 10 machine after adding RXTXComm.jar and rxtxserial.dll into java path.

But the same solution when we deployed on Linux server throwing an error.

Servlet.service() for servlet [dispatcherServlet] in context with path [/wto-microservice] threw exception [Handler processing failed; nested exception is java.lang.NoClassDefFoundError: Could not initialize class gnu.io.CommPortIdentifier] with root cause
2018-06-25T15:47:39.34+0530 [APP/PROC/WEB/0]OUT java.lang.NoClassDefFoundError: Could not initialize class gnu.io.CommPortIdentifier
2018-06-25T15:47:39.34+0530 [APP/PROC/WEB/0]OUT at com.ge.combo.controller.RailwayController.readData(RailwayController.java:69) ~[app/:na]

Since Java enums can have values associated with them, we can cleanup the code a bit and make it less likely to fail if we simply give the enums an actual value.

Enums to update:

• BaudRate
• DataBits
• StopBits
• Parity
• Flow Control

Hello,
I used you library and had some problems when I was reading from the InputStream retrieved from the SerialPort and at the same time catched an InterruptedException. I believe that the problem is in the read method from the class BufferedSerialInputStream. When an InterruptedException is catched, you only print the exception but I believe that you should restore the interrupted status after catching InterruptedException. So, changing the code "e.printStackTrace();" with the following code "Thread.currentThread().interrupt();" seems to fix the problem.
Best regards,
Juanan

A similar issure as I pointed out in JSSC:
https://github.com/scream3r/java-simple-serial-connector/issues/123

When opening up a serial port, if the baud rate is unable to be set an IOException can be thrown. When this happens, the native resources are not cleaned up properly and can potentially lead to resource exhaustion if it continues forever.

1. Create a simple Eclipse 3.x RCP application with the wizard of new plug-in project. Name it as app plugin.
2. Run app plugin and make sure the simple view defined in the plug-in appear.
3. Create a plug-in project with the wizard of "Plug-in from existing JAR archives", choose JavaSerial-0.7.jar as external JAR. Name this plug-in as JavaSerial-3rd-lib.
4. Turn to app plugin, open plugin.xml file and add JavaSerial-3rd-lib plugin as required plug-ins.
5. Open the View.java file in app plugin, replace the return statement of createInitialDataModel() method with: return Arrays.asList(SerialPort.getSerialPorts());
6. In the Run configurations -> plug-ins tab, check JavaSerial-3rd-lib plug-in, run it.
7. Errors occured:

org.eclipse.e4.core.di.InjectionException: java.lang.NoClassDefFoundError: com/rm5248/serial/SerialPort
Caused by: java.lang.NoClassDefFoundError: com/rm5248/serial/SerialPort
at javaserialportosgitest.View.createInitialDataModel(View.java:70)
at javaserialportosgitest.View.createPartControl(View.java:57)

8. create another plug-in project with the wizard of "Plug-in from existing JAR archives", choose jssc-2.8.0.jar (https://github.com/scream3r/java-simple-serial-connector) as external JAR. Name this plug-in as jssc-3rd-lib.
9. Add jssc-3rd-lib plugin to the required plugins of app plugin project.
10. Open the View.java file in app plugin, replace the return statement of createInitialDataModel() method with: return Arrays.asList(SerialPortList.getPortNames());
11. In the Run configurations -> plug-ins tab, checkjssc-3rd-lib plug-in, run it. The available serial ports list in the view and no error occured.

Hello,
Thank you for this library.
I want to get every serial port of my system and save it in somewhere.

String[] ports = SerialPort.getSerialPorts();

always return empty;
How I can fix that?

I used

com.rm5248 JavaSerial 0.9

I'm trying list the available ports on my system, but I'm getting this error.

The Error:
open: No such device or address ERROR: This is a very bad thing that should never happen SerialPortImpl.c:1724 errno:22 open: No such device or address ERROR: This is a very bad thing that should never happen SerialPortImpl.c:1724 errno:6

The code:

 import com.rm5248.serial.SerialPort;

import java.util.Arrays;
import java.util.List;

public class ReadingFromPortTest {
  public static void main(String[] args) {

    List<String> serialPorts = Arrays.asList(SerialPort.getSerialPorts());
    serialPorts.forEach(System.out::println);
  }
}

Any idea what it might be?

If possible, I would appreciate to use a baudrate of 57600 (linux).

I use JavaSerial to test some modems. One (NewWay 27) seems to detect the baudrate well on the first start, but on restart it seems to stick to 57600.

Possible issue with OSX: not all characters are being written to the serial port at once in our write() call. When testing the other week, I noticed that OSX only seemed to send the first two characters of the string.