Hi Martin,
Adding the local.rules file did fix the permissions problem but
unfortunately the result is the same. I think maybe the programmer
application software uses a proprietary driver. I had a similar problem
with a different unit that uses USB and had to abandon it. It seems
easier to make the parallel port work rather than USB but I don't do
that type of programming.
Any other ideas?
Best regards,
Fred
On 03/28/2013 08:51 AM, Martin Gregorie wrote:
On Thu, 2013-03-28 at 00:39 -0700, Fred wrote:
Hello,
I would like to use a logic device programmer that uses the parallel
port. The application software runs well under wine (on Debian 6.0) but
it reports it can't find the programmer. I have a link to the parallel
device: .wine/dosdevices/lpt1 -> /dev/lp0.
What are the permissions and group assignments of /dev/lp0? On my Fedora
16 box it is owned by root and is in the lp group and has has no 'world'
access permissions:
crw-rw---- 1 root lp 6, 0 Feb 19 16:59 lp0
IOW, if /dev/lp0 has the same ownership and permissions as mine and the
user where you're running the logic device programmer isn't a member of
the lp group your programmer won't be able to access /dev/lp0. You have
two options:
1) add the user to the lp group
2) change the permissions of /dev/lp0 so it has world read
and write permissions
I've used option (2) to allow WINE programs to access my serial ports
(/dev/ttyS[0-4] - I have five thanks to a multi-port serial adapter
card), but you can only do this by adding a UDEV rule because modern
kernels use UDEV device handling and this recreated the device files
each time its booted. I added the file /etc/udev/rules.d/99-local.rules
to me system:
============= 99-local.rules =================
#
# Give world read/write access to ttyS* and ttyUSB* serial devices
#
KERNEL=="tty[A-Z]*", GROUP="uucp", MODE="0666"
============= 99-local.rules =================
so this should work for lp0 [caution: untested]
============= 99-local.rules =================
#
# Give world read/write access to lp0
#
KERNEL=="lp0", GROUP="lp", MODE="0666"
============= 99-local.rules =================
Drop the file in place, reboot, and run 'ls -l /dev/lp0' to check that
it had the right effect. If do the programmer should now find the
parallel port.
Martin
