Experimental Physics and Industrial Control System
I think I have allowed sufficient time for someone else to jump to
support pvDatabaseCPP...
On 10/4/23 08:38, Ignacio Arriagada via Tech-talk wrote:
Hello Tech-Talk!
I'm trying to integrate PVAccess (or PVXS) capabilities into an old IOC. *
*
* *What would be the best way to exchange data between the old DBRecords and the new PVRecords with custom data structures, within the same IOC*?
The PVRecord c++ class is specific to the pvDatabaseCPP modules, which
I do not recommend for new code.
I do *not* see PVRecord as a replacement for the process database.
imo. the name "PVRecord" is a misnomer. It has no linking or scanning
facilities. And only simple locking. It is a fairly low level tool
comparable to the "casPV" class from PCAS, or the SharedPV class from
"PVXS".
* Do I need to set up a pvClient within the same ioc?
* Does the exchange need to be done via PVAccess connections or is there an internal way of doing it?
Through PVAccess. "PVRecord" is an interface to a PVA server.
I've been reading Marty Kraimer EPICSV4 developers guide <https://mrkraimer.github.io/website/developerGuide/developerGuide.html> and associated git examples. I'm also consulting Michael Davidsaver's PVXS documentation but it is not clear to me yet how to accomplish this. Are there other resources or examples that I could access regarding this topic?
Unless you have some special need, I would suggest writing an "normal"
EPICS driver (w/ device support, .db files, etc.).
If you do want something more, like more complex data structures, I
would suggest first looking into QSRV groups.
https://mdavidsaver.github.io/pvxs/qgroup.html#understanding-groups
Or if you find something some data structure or operation which
can't be mapped to the process database, you could look into SharedPV.
eg. https://mdavidsaver.github.io/pvxs/example.html#mailbox-server
This example sets up a standalone server. It is also possible to
add a SharedPV alongside (but separate from) the records served
by QSRV2.
https://mdavidsaver.github.io/pvxs/ioc.html#adding-custom-pvs-to-server
Thank you all in advance,
Regards,
Ignacio
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- DBRecord <-> PVRecord data exchange Ignacio Arriagada via Tech-talk
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