DMX512
======

controlling DMX from within Pd



A. setting up dmx4linux
=======================
note: there are debian(etch)-packages for dmx4linux, 
      but these seem to be pretty old (2.5)
      i haven't really tried these.
      instead i used dmx4linux-2.6.1

first get dmx4linux from http://llg.cubic.org/dmx4linux/
and extract it.

the drivers should compile fine with 2.6.18 kernels, but
alas! i am using 2.6.25 and there are some quirks to make
these work.

first of all i had problems compiling the ISA/PCI/parport drivers,
but since i only wanted to use a USB device, i just disabled those.
second, dmx4linux's build-system tries to override CFLAGS when building
the kernel-modules, which newer kernel versions (e.g. 2.6.25) do not like
at all. i had to modify the makefiles in order to use the EXTRA_CFLAGS

all the changes i did can be found in the dmx4linux2.6.1.patch
just run:
% patch -p1 < dmx4linux2.6.1.patch

then do
% ./configure
(which will produce a /tmp/dmxconfig.mk)
and run
% make

finally become root and do
# make install


load the appropriate kernel modules


B. permissions
the dmx device-files created by udev will be owned by root.root and not be 
read/writeable by anyone but root.
in order to use them as an ordinary user, become root and create a group 
"dmx" and add users who need access to the dmx-devices to this group:
# addgroup dmx
# adduser zmoelnig dmx

in theory this should be enough to allow you access to your dmx devices
the next time you load a dmx-driver 
if you have problems, try plugging your device out and in again