[Rxtx] Multiple serial port connections in RXTX

[Muzammil Hussain]

Thanks Micheal and Kusti, it is solved now :-) Was scratching my head
of the thread-safety issues of RXTX and javacomm for a day now - at
least I dont have to worry about that.

regards,
Muzammil




On Thu, Mar 31, 2011 at 11:36 AM, Muzammil Hussain
<muzammil.hussain.syed at gmail.com> wrote:
> Michael,
>
> Could you let me know how to do it correctly ? I believe that I am
> instantiating seperate objects of SerialReader and SerialWriter for
> the 2 serial ports.
>
> regards,
> Muzammil
>
>
>
>
> On Thu, Mar 31, 2011 at 12:20 AM, Muzammil Hussain
> <muzammil.hussain.syed at gmail.com> wrote:
>> Hi,
>>
>> I have 2 serial ports on my computer and I am using RXTX to read and
>> write to them *seperately*. My code snippet is as follows
>>
>>
>>                if ( (commPort1 instanceof SerialPort) && (commPort2
>> instanceof SerialPort) )
>>                {
>>                    SerialPort serialPort1 = (SerialPort) commPort2;
>>
>> serialPort1.setSerialPortParams(115200,SerialPort.DATABITS_8,SerialPort.STOPBITS_1,SerialPort.PARITY_NONE);
>>
>>                    SerialPort serialPort2 = (SerialPort) commPort2;
>>
>> serialPort2.setSerialPortParams(115200,SerialPort.DATABITS_8,SerialPort.STOPBITS_1,SerialPort.PARITY_NONE);
>>
>>                    InputStream in_p1 = serialPort1.getInputStream();
>>                    OutputStream out_p1 = serialPort1.getOutputStream();
>>
>>                    InputStream in_p2 = serialPort2.getInputStream();
>>                    OutputStream out_p2 = serialPort2.getOutputStream();
>>
>>                    (new Thread(new SerialReader("MOTE-1", in_p1))).start();
>>                    System.out.println("Started serial reader 1");
>>                    (new Thread(new SerialWriter("MOTE-1", out_p1,
>> write_to_mote))).start();
>>                    System.out.println("Started serial writer 1");
>>
>>                    (new Thread(new SerialReader("MOTE-2",in_p2))).start();
>>                    System.out.println("Started serial reader 2");
>>                    (new Thread(new SerialWriter("MOTE-2", out_p2,
>> write_to_mote2))).start();
>>                    System.out.println("Started serial writer 2");
>>
>>                    System.out.println("Successfully connected to
>> Cricket mote on ports "+ port1Name +" and "+ port2Name);
>>                }
>>
>> The SerialReader and SerialWriter are Runnable classes as defined in
>> the example on the RXTX 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.
>>
>> I guess it has to do with the thread-safe aspect of RXTX and I
>> understand that it is not thread-safe.
>>
>> Is there a possible solution for this ?
>>
>> M
>>
>