- From: Paolo Mantegazza <mantegazza_at_aero.polimi.it>
- Date: Tue, 11 Feb 2003 09:51:02 +0100
John Sims wrote: > > Hi All, > I'm working in implementing an approach as discussed in the comedi_lxrt > section of rtai, where Paolo discusses using > rt_comedi_register_callback. I have a routine I ported over from a > kernel module that uses a callback to detect an asynch signal coming in > on the printer port, going through comedi_parport. > > I have removed the standard lp and parport modules, so that > comedi_config /dev/comedi1 comedi_parport 0x0378,7 functions properly, > and shows up correctly if I look in the output of dmesg. However, when > I attempt to perform comedi_open, the result comes back NULL, and I > cannot continue. If I look at the output of dmesg, I see: > BAD: null rt_fun_ext[9] > BAD: null rt_fun_ext[9] > > I've worked off of the testa.c example found under the newlxrt section > of the rtai tree. > > Any ideas as to why the comedi_open is failing? > Extension of kcomedi calls in user space calls is an RTAI matter. It seems that such an extension is missing. Have you installed the comedi_lxrt user space extension module? Paolo.
Received on 2003-02-11Z08:51:02