Re: das16 and 8255 support

From: Karen Daniels <ked_at_phy.duke.edu> · Date: 20 Mar 2003 17:53:05 -0500

Sorry. I should have mentioned that I have already made this change. I
was using the PIN number as the argument to the -c switch, rather than
the channel number, and also included the -s4

Karen

On Thu, 2003-03-20 at 17:48, Claudio Coppola wrote:
> ----- Original Message -----
> From: "Karen Daniels" <ked_at_phy.duke.edu>
> To: <comedi_at_comedi.org>
> Sent: Thursday, March 20, 2003 10:22 PM
> Subject: Re: das16 and 8255 support
> 
> 
> > On Thu, 2003-03-20 at 10:45, Frank Mori Hess wrote:
> > > -----BEGIN PGP SIGNED MESSAGE-----
> > > Hash: SHA1
> > >
> > > On Wednesday 19 March 2003 01:16 pm, Karen Daniels wrote:
> > > > Hello --
> > > >
> > > > I have successfully been using the das16 driver with my Kiethley
> Metrabyte
> > > > card, and now wish to begin using the digital I/O features as well.
> > > >
> > > > I have recompiled the modules to include 8255 support and am
> installing the
> > > > module 8255.o before I install das16.o. Nonetheless, after issuing the
> > > > comedi_config command I still get the error message "8255 support not
> > > > configured -- disabling subdevice"
> > >
> > > You are still using the old (compiled without 8255 support) das16
> driver.
> > > Try make clean, make, make install, modprobe das16 -r,(lsmod and make
> sure
> > > das16 got unloaded), modprobe das16
> > >
> >
> > This has solved the problem of recognizing the 8255, but using dio.c to
> > toggle a pin which corresonds to one of the 4 digital channels provides
> > no discernible output.
> >
> > Does the following output from the "info" program mean that the
> > comedi_dio_read and comedi_dio_write routines are not supported? (I
> > interpreted the 24 channels to mean pins, but the first digital input
> > channel is actually at pin #25, so I'm worried).
> >
> > subdevice 4:
> >   type: 5 (digital I/O)
> >   number of channels: 24
> >   max data value: 1
> >   ranges:
> >     all chans: [0,5]
> >   command:
> >     not supported
> >
> > Perhaps this is related to the fact that subdevices 2 and 3 refer to the
> > digital input and output separately, and so I'm not actually accessing
> > them at all via subdevice 4? If I choose subdevice 2 or 3, then I get
> > the message "is not a digital I/O subdevice"
> >
> >
> > Thanks,
> > Karen Daniels
> >
> >
> > _______________________________________________
> > comedi mailing list
> > comedi_at_comedi.org
> > https://cvs.comedi.org/cgi-bin/mailman/listinfo/comedi
> >
> 
> The section of code that toggles the bit is commented out.
> Try remove the comments and recompile
> 
> The command line should be something like
> 
> ./dio -s4 -c1
> 
> where -s4 is subdevice 4 and -c1 is channel 1
> 
> 
>   comedi_dio_write(device,subdevice,channel,1);
> #if 0  <------------------------ remove #
>  for(i=0;i<10000;i++){
>   usleep(1000000);
>   comedi_dio_write(device,subdevice,channel,1);
>   printf("1\n");
>   usleep(1000000);
>   comedi_dio_write(device,subdevice,channel,0);
>   printf("0\n");
>  }
> #endif <--------------------- remove #
> 
> Claudio
> 
> 