Argonne National Laboratory

Experimental Physics and
Industrial Control System

1994  1995  1996  1997  1998  1999  <20002001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  2021  2022  Index 1994  1995  1996  1997  1998  1999  <20002001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  2021  2022 
<== Date ==> <== Thread ==>

Subject: Re: forcing binary output value at initialization
From: wlupton@keck.hawaii.edu (William Lupton)
To: pate@lepton.nmsu.edu, anj@aps.anl.gov
Cc: tech-talk@aps.anl.gov
Date: Fri, 21 Apr 2000 13:48:27 -1000
Andrew Johnson wrote:
>In fact VAL is only set from RVAL if the device support routine returned
>0 (which the xy240 one does). The device support knows that it can read
>back the current output register contents from the hardware...

This issue also came up a couple of months ago in the context of the
VxWorks global variable device support. There was an _extensive_
discussion and in the end it was agreed (I believe!) that there was a
case for giving the creator of the database control over whether the
initial value came from the DOL field or from the underlying global
variable. So this is what was done in this specific case... but maybe a
more general solution is called for?

William


Navigate by Date:
Prev: Re: forcing binary output value at initialization Andrew Johnson
Next: Re: forcing binary output value at initialization pate
Index: 1994  1995  1996  1997  1998  1999  <20002001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  2021  2022 
Navigate by Thread:
Prev: Re: forcing binary output value at initialization Andrew Johnson
Next: Re: forcing binary output value at initialization Ned Arnold
Index: 1994  1995  1996  1997  1998  1999  <20002001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  2021  2022 
ANJ, 10 Aug 2010 Valid HTML 4.01! · Home · News · About · Base · Modules · Extensions · Distributions · Download ·
· Search · EPICS V4 · IRMIS · Talk · Bugs · Documents · Links · Licensing ·