Thread Subject: usb-serial error with fclose Mac OS X

Hi guys, I'm trying to use a usb to serial cable with matlab

s = serial('/dev/tty.usbserial');
fopen(s)

the above works fine. However, when I try to close to the port with

fclose(s)

Matlab crashes. Anyone have similar problems, and find a solution?

"Scott " <sparcheta3@gatech.edu> wrote in message
news:hbaiaa$gfj$1@fred.mathworks.com...
> Hi guys, I'm trying to use a usb to serial cable with matlab
>
> s = serial('/dev/tty.usbserial');
> fopen(s)
>
> the above works fine. However, when I try to close to the port with
>
> fclose(s)
>
> Matlab crashes. Anyone have similar problems, and find a solution?

Hi Scott,


We did not see that in testing for 9b. It would be best to call into
support your details but we would need the following to reproduce the
problem.

Which version of MATLAB?
32 bit or 64 bit MAC OS X?
What brand/model of USB adaptor are you using?
  - links to the product and driver are a plus.

Hi,
I have the same problem. I have a USB-> serial device using the driver from :
http://osx-pl2303.sourceforge.net/
and have the same error--- I can connect, read and write, but not close a connection. I am running Matlab 2009a on OSX 10.6.2
i get this error : segmentation violation

Stack Trace:
  [0] librxtxSerial.jnilib:Java_gnu_io_RXTXPort_interruptEventLoop~(0x18807910, 0xb09030c0, 0x250d5210, 9) + 137 bytes
  [1] 0x1900b839(0, 0x19009a09, 0x1bc20128, 0xb09030c4)
  [2] 0x19003db1(0, 0x1bc20128, 0xb09030f4, 0x25092466 "¶X")
  [3] 0x19003db1(0, 0x1bc654f0, 0xb0903124, 0x2502a787 "¶®")
  [4] 0x19003db1(0, 0x1bc654f0, 0x175fb4ee, 8097)


Thanks for the help

I tried this again, with a different USB-Serial device and driver: http://www.ftdichip.com/Drivers/VCP/MacOSX/FTDIUSBSerialDriver_v2_2_14.dmg

And again, I get the same error: segmentation fault re the LibRxTxSerial library

I tried updating the librxtxserial to the newest version from
http://rxtx.qbang.org/pub/rxtx/rxtx-2.2pre2.zip
and compiled on my machine, replaced the files within Matlab, and get
the same error.


On Feb 22, 11:55 am, "Nikolas " <ivanc...@ucmail.uc.edu> wrote:
> I tried this again, with a different USB-Serial device and driver:http://www.ftdichip.com/Drivers/VCP/MacOSX/FTDIUSBSerialDriver_v2_2_1...
>
> And again, I get the same error: segmentation fault re the LibRxTxSerial library