Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Tue, 31 Oct 2006 10:51:10 -0600

Hi David,
David Dudley wrote:

From the talk on Device Support is says that the DSET - initialize
routine, when passed a parameter of 1, "Can be used as a final
startup step.  All device address information is now known."
Does this imply that once the iocinit() routine has called the
initialize routine with the parameter of 1, I can infer that no
additional I/O items could be defined?

Unless you're providing the ability to change addresses at runtime (by
implementing Extended Device Support, see the R3.14.8.2 iocAppDevGuide
section 12.5 for details) the answer is yes. The full initialization
order for a device support is
1. For all dsets, call dset->init(0)

2. For all records, call rset->init_record(prec, 0) which in turn calls
dset->init_record(prec, 0)

3. For all records, if a dsxt was registered call dsxt->add_record(prec)

4. For all records, call rset->init_record(prec, 1) which in turn calls
dset->init_record(prec, 1)

5. For all dsets, call dset->init(1)
If you don't register a dsxt during your dset->init(0) call then it is
not possible to change the record's INP/OUT field at runtime so your
inference would be correct.
- Andrew
--
There is considerable overlap between the intelligence of the smartest
bears and the dumbest tourists -- Yosemite National Park Ranger

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System