Experimental Physics and
Industrial Control System

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

Subject:	GPIB/ASYN user port data
From:	"Andrew C. Starritt" <[email protected]>
To:	"EPICS Tech Talk ([email protected])" <[email protected]>
Date:	Wed, 18 Mar 2009 11:37:36 +1100

Hi all,

When using devGpib inconjuction with ASYN, I sometimes want to store port

specific user status data (as opposed to record specific state data).

Suppose the gpibCmds table may look like:

static struct gpibCmd gpibCmds[] = {

/* 0 - Frequency Monitor */

{&DSET_AI, GPIBCVTIO, IB_Q_LOW, NULL, NULL, 20, 20,

performIo, 12, 0, NULL, NULL, 0},

/* 1 - Frequency Set Point */

{&DSET_AO, GPIBCVTIO, IB_Q_LOW, NULL, NULL, 0, 20,

performIo, 12, 0, NULL, NULL, "\033"},

.... etc

};

In the performIo function is it possible to do something like the following:

typedef struct portState {

int Count;

....;

} portState;

static int performIo (struct gpibDpvt *pdpvt, int P1, int P2, char **P3)

{

portState *pPortState;

pPortState = pdpvt->????->????->????;

if (pPortState == NULL) {

/* Allocate port specific data

pPortState = dbCalloc (1, sizeof (portState));

pdpvt-????->????->???? = pPortState;

/* Initialise port specific data

pPortState->Count = 0;

.....;

}

pPortState->Count++;

.....;

}

And if so, what can I safely use for ????->????->????

I have a work around by extracting the port number xxx corresponding

to the

field (INP, "#Lxxx Aaaa @ccc");

from the inp/out field of the record, but this seems a bit of a hack.

Regards

Andy

Andrew Starritt, Principal Controls Engineer, Australian Synchrotron
800 Blackburn Road, Clayton, Victoria 3168

ph: (03) 8540 4164 , fax: (03) 8540 4200
mailto:[email protected], http://www.synchrotron.org.au

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ANJ, 31 Jan 2014

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System