Experimental Physics and
Industrial Control System

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

Subject:	asynPortDriver: get all addresses for ASYN_MULTIDEVICE
From:	"Dunning, Michael via Tech-talk" <[email protected]>
To:	EPICS Tech-Talk <[email protected]>
Date:	Tue, 19 Nov 2019 14:02:38 -0800

I've written an asynPortDriver for a TCP/IP-to-BitBus gateway which talks to power supply controllers. The driver sends addressed messages to each controller and receives similar messages as responses. The controllers may have non-sequential addresses in the [1, 200] range.

It works well with a single controller, and now I'm adding support for multiple controllers. Since the gateway doesn't support multiple sockets, I'm using ASYN_MULTIDEVICE (multiple addresses using a single asyn port).

To poll the controllers, I need to loop over all addresses in my driver. If I have sequential addresses that's easy, but mine may be non-sequential and I don't want to loop over non-existent addresses.

Is there a way to get a list of all registered addresses for a given port from asynManager somehow? By "registered" I mean an address that's present in a record and tied to a specific port, e.g.:

record(bo, "$(ps):StateSetpt") {
field(DESC, "Power Supply On/Off")
field(DTYP, "asynInt32")
field(OUT, "@asyn($(asynPort), $(address), 0) STATE_SETPT")
field(ZNAM, "OFF")
field(ONAM, "ON")
}

My first attempt would be to follow the asynReport (pasynManager->report) function which sets up a linked list and prints all addresses. Am I on the right track? Or is there something built-in that I missed?

Thanks,

Mike

Michael Dunning
SLAC National Accelerator Laboratory
2575 Sand Hill Road
Menlo Park, CA 94025
(650) 926-5200

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ANJ, 19 Nov 2019

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System