Experimental Physics and
Industrial Control System

We are running EPICS 3.14.4 Linux IOC with the Comedi driver 
for the National Instrument PCI-MIO-16E-1 multifunction board.
Only ai, ao, bi, bo EPICS synchronous device supports are 
implemented so far. 

We are going to get the counter of the PCI-MIO board working 
with the synApps scaler record. Yet the Comedi counter API
is unstable and undocumented. We have to read the Comdei code 
in order to get anything done.

Hopefully we could work out a simple match of the Comedi 
"command" constructs to the EPICS asynchronous operations for 
the scaler and other records. We have not decided if making
Linux system calls directly would be simpler.

The comedi_parport driver can also be used for EPICS bi, bo
operations. This is free EPICS bit I/O using the standard 
PC parallel port.

Once the device support of the commonly used EPICS records 
are worked out, the generalization to other Comedi supported
hardware should be much easier.


Ivan So
NSLS/BNL

Lawrence T. Hoff wrote:

> I just finished reading the article on Comedi in the
> August 2004 edition of LINUX Journal. Apparently, Comedi
> is an open-source effort to support many PC-based I/O
> modules. I had never heard of it before. Do any LINUX/EPICS
> users have experience with Comedi to share?
>
>	For the curious, here is a list of supported H/W:
>
> http://www.comedi.org/hardware.php
>
> -- Larry