Experimental Physics and
Industrial Control System

Benjamin Franksen <[email protected]> · Sat, 05 Feb 2000 00:52:22 +0100

[email protected] wrote:
> 
> Hello -
> 
> Since we're on the subject of save/restore, there is a little problem
> with boRecord.c that forces us to restore soft BOs differently from
> soft AOs.  For both record types, we set DOL to blank (these are soft records
> and are used for storing constants and user inputs).  We then use use static
> db restore in initHooks.c before record initialization to restore VALs from
> file.  I need to set PINI to YES on the soft BOs in order to get the proper
> severity to drive the color on some displays (usually RED if OFF and GREEN if
> ON).  However, for a soft BO with a blank DOL, process won't reset the udf flag
> to true and the severity is INVALID until somebody does a ca put to change
> VAL.  So I'm forced to restore soft BOs with channel access after initHooks
> is done.  I don't have the problem with soft AOs since process (convert, really)
> will always set udf to false no matter what.
> 
> Could the process function of the boRecord.c be changed:
> 
>                 /* convert val to rval */
>                 if ( pbo->mask != 0 ) {
>                         if(pbo->val==0) pbo->rval = 0;
>                         else pbo->rval = pbo->mask;
>                 } else pbo->rval = (unsigned long)pbo->val;
> >>>add this>>>  pbo->udf = FALSE;

IMHO it would not be correct to do this. Setting UDF to FALSE should
only be done if the value is defined. This is not the case if DOL is
undefined, at least as long as we are not shure that some kind of
readback actually happened.

We need a way to tell if readback at init time actually happened or not.
At the moment, only the code that does the readback knows this. So, in
your case, the right place to put the UDF=FALSE is in the code that sets
the RVAL or VAL (i.e. the db restore code that is called from the
initHook).

Things would be different if the readback would be initiated by the
record support.

Ben
-- 
The Notorious Neb Nesknarf

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System