- From: Roberto Bucher <roberto.bucher_at_supsi.ch>
- Date: Mon, 6 Nov 2006 14:16:11 +0100
RTAI-Lab runs without problems using the COMEDI devices. Please be shure to have all the needed rtai modules loaded (including the rtai_comedi.ko module!) Roberto On Monday 06 November 2006 13:14, M. Koehrer wrote: > Hi everybody, > > I am trying to use the comedi commands using RTAI (RTAI 3.3CV, latest > comedi/comedilib). On the RTAI CVS I have found an (old?) example testa.c > that I used as base. (see attached testa.c). > The program testa sets up a command to sample from the first AIN channel > a couple of times. > The test compiles and runs (10 lines are printed out), however the data > value is always 0. > I have debugged into the driver (I use a simple PCI NI 6024-E) and I found > out that the data is transferred correctly via DMA to the async > prealloc_buf. It seams as the only thing that misses is the transfer from > the internal (kernel space) memory that holds the input values (written by > DMA) to the user space value. > > One strange thing that I have detected was the following: > The function rt_comedi_alloc_cmd() sets internally the values of cmd->data > and cmd->chanlist and returns the values in the arguments **chanlist and > **data. However, when testa returns from comedi_command_test() the value of > cmd->data has changed - it points now somewhere in a 0xexxxxxxx address > space. Could this be an issue? > > Is there somewhere a running example available that shows working comedi > commands with RTAI? > > Thanks for any help on this issue. > > Mathias -- University of Applied Sciences of Southern Switzerland Dept. Innovative Technologies CH-6928 Lugano-Manno http://www.dti.supsi.ch/~bucher
Received on 2006-11-06Z13:16:11