Error message about serial library version

Core Library Questions

tech37

Error message about serial library version

in Core Library Questions • 1 years ago

I am trying to send a file through a serial port. ( to an Arduino ) It work ( sort of ) <-- RX light up..

But I received this message. Even there is nothing connecting to the serial port. COM1

Here the "error" message.

WARNING : RXTX Version mismatch

Jar version = RXTX-2.2pre1

native lib Version = RXTX-2.2pre2

What is it ? And what I can do to correct it ? Program work fine. Except that error message.

Here my code : I modify the example code of loadBytes()

import processing.serial.*;
Serial myport;
void setup()
{
println(Serial.list());
myport = new Serial(this,Serial.list()[3], 9600); // My Arduino is COM7
// change the line --> myport = new Serial(this,Serial.list()[0],9600); // for COM1
// open a file and read its binary data
byte b[] = loadBytes("curconv.rms");

int sz=b.length;
println("The size of the file is : "+sz+"\n");
// print each value, from 0 to 255
for (int i = 0; i < b.length; i++)
{
// every tenth number, start a new line
if ((i % 16) == 0) {
    println();
}

// bytes are from -128 to 127, this converts to 0 to 255
   int a = b[i] & 0xff;
   print(hex(a,2) + " ");
   myport.write(a);

}
// print a blank line at the end
println();
}

Replies(5)

gael_lego..

Re: Error message about serial library version

1 years ago

Hi,

I lso have that problem on linux but I found some explanations here.

install rxtx on windows 7

But it is for Windows 7, so on linux, maybe it misses something.

However, the library seems good now on linux, no more warning, but processing crashes anyway

I still have this error " ArrayIndexOutOfBoundsException:0"

I just use the first simple code example of the serial library.

rxtxParallel.dll and rxtxSerial.dll are for windows so I don't know where to put the equivalent ones in Processing for linux...

For linux, It is librxtxParallel.so and librxtxSerial.so, I put them in processing1.5.1/java/lib/i386/

Hope it will help u anyway

Gael

tech37

Re: Error message about serial library version

1 years ago

Thank for replying gael_lego;

I will look into it, my system is Window XP, but it did give me some hints. Maybe I need a new version of the serial library files.

As your error message "ArrayIndexOutOfBoundsexception:0" is the array in your program. It is simply not enough space ( example : int mydata[50]; 50 is to small ) or your program is trying to place to much data in your array ( more than 50 for example ) . The solution is : try to re-design your code to take into account the array size.

My guess.

gael_lego..

Re: Error message about serial library version

1 years ago

Hi,

About my little problem, I just use the example code for "serial" in order to get the list of the different ports.

here it is:

// Example by Tom Igoe
import processing.serial.*;
// The serial port:
Serial myPort;
// List all the available serial ports:
println(Serial.list());

I have no error until there but I do not have the list of the ports, nothing ...

I read the same problem for other people but I didn't succeed to solve it.

I changed the library for this one "rxtx-2.1-7-bins-r2.zip" but nothing...

I don't understand

I miss something

THank u for helping

Gael

tech37

Re: Error message about serial library version

1 years ago

Hi gael_lego;

About the error message :

WARNING : RXTX Version mismatch

Jar version = RXTX-2.2pre1

native lib Version = RXTX-2.2pre2

I did not yet fix it. ( I will investigated about it ). About your message : "ArrayIndexOutOfBoundsexception:0" , Well you know what, I try my code ( work if my Arduino board is connected ) and I try again with nothing connected it, guess what ! I DO have that error message "ArrayIndexOutOfBoundsexception:3" <-- 3 instead. My guess about arrays was right ! The error message talk about the PORTS array. It mean the port 3 ( in my case ) is simply not there. During run time with my Arduino board connected, the println(Serial.list()); show this :

[0] "COM1" <-- One of my serial port on my PC

[1] "COM2" <-- A another serial port on my PC

[3] "COM7" <-- My Arduino port when connected.

I use your code in your last posting. I have the following ports :

[0] "COM1" < --- I have a 9 pin RS-232 at the back of my computer.

[1] "COM2" <-- An another 9 pin RS-232 at the back of my PC.

I did expect that. What about you ? Your error message is : "ArrayIndexOutOfBoundsexception:0" <-- 0 is the first port. I got the feeling that you have no ports ! If that is the case, please check your computer "Device Manager" to confirm. It will show a list of ports connected. I always check it if one the Arduino board is connected or not.

My solution / idea : If you do not have a "port", you need to use a "USB to SERIAL" Device, and the USB device will become a port which should become COM1 ( a Virtual Port Com 1 ). Don't forget to install the driver of the device being install. Example : Installing the Arduino Board to a PC system. <-- Need Arduino IDE, USB driver.

The raison is : The Processing Serial Library is design to use a port not a USB. Only a real or virtual port. To use a USB device ( example : USB Joystick ) you may need a Processing library to access the device. In my opinion.

Anyway here the code I use to send a simple text to a Arduino and the Arduino will display the text using a LCD display.

/* This code will work if you modify the portindex value to
the port where your Arduino is connected in your system.
*/
import processing.serial.*;
Serial myport;
int portindex=3; // My Arduino is connect to Port 7 - 3 in the list.
void setup()
{
   size(200,200);
   println(Serial.list());
   println("Connecting to "+Serial.list()[portindex]);
   myport = new Serial(this,Serial.list()[portindex],2400);
   myport.write("This is a test");
}
void draw ()
{

}

headbange..

Re: Error message about serial library version

1 year ago

Hi all:

I am using Arduino UNO and Processing 1.51 on Ubuntu 10.10

I had the " ArrayIndexOutOfBoundsException:0" error for a while thanks to a bug on Processing that denies communication to the Arduino because of the name it uses in the /dev/ folder. Generally the Arduino UNO shows up as /dev/ttyACM0 but Processing can only communicate with /dev/ttyS*. What you need to do to circumvent this issue is to create a symlink to make Processing believe that it is talking to an expected ttyS* device by issuing the following comand on a terminal:

ln -s /dev/ttyACM0 /dev/ttyS8

One can use other names of the symlink like:
ln -s /dev/ttyACM0 /dev/ttySA0

This is part of the bug report of gunther.momsen so credits to him. It is reported and expected to be fixed for future Processing releases.

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