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<== Date ==> <== Thread ==>

Subject: Re: camac crate initialization
From: [email protected]
Date: Mon, 09 May 94 17:07:32 -0400
CEBAF's strategy for CAMAC in EPICS is to have all CAMAC device
support sit directly above the CAMAC IEEE/ESONE standard routines.
I.e., they use nothing except the standard routines.  

The advantage of this is that then EPICS can run against ANY 
CAMAC interface, since all CAMAC interfaces have the IEEE routines 
available, or can easily have these routines added.  At CEBAF, we
use 2 different hardware interfaces, and the standard routines hide
the differences from EPICS.

I will grant that this could cost slightly in performance in principle, 
however, with good coding this is not the case, and the portability 
is worth the extra effort.

Device initialization, therefore, becomes the domain of the device
support layer, using standard routine calls.  We are considering
adding LAM callbacks in device support to detect crate power-up so 
that we can automatically re-initialize a crate without restarting EPICS.
The CAMAC device support will support (coming in a month) an initialization
function as part of the hardware address "parm" field, and this function
will be repeated when the power interrupt occurs.  This is consistent
of our strategy of having most CAMAC modules supported by a single,
generic, CAMAC device support (less code to maintain).

Chip

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