There is no direct communicaton possible between the NELM field of the waveform record and the asyn driver. However, it is easy to do using an intermediate longout record, for example:
record(longout,"$(P)$(R)NELM1") {
field(DOL, "$(P)$(R)Waveform1.NELM CP MS")
field(OMSL, "closed_loop")
field(DTYP, "asynInt32")
field(OUT, "@asyn($(PORT),$(ADDR),$(TIMEOUT))WAVEFORM_NELM1")
}
record(longout,"$(P)$(R)NELM2") {
field(DOL, "$(P)$(R)Waveform2.NELM CP MS")
field(OMSL, "closed_loop")
field(DTYP, "asynInt32")
field(OUT, "@asyn($(PORT),$(ADDR),$(TIMEOUT))WAVEFORM_NELM2")
}
These longout records will process whenever the NELM fields change, including once at iocInit.
They will send the NELM field of the appropriate waveform record to you driver. You just need to treat the writes with 2 different pasynUser->reason values differently. If it is the one corresponding to WAVEFORM_NELM1 do one thing, and do something different if it is for WAVEFORM_NELM2.
Mark
From: [email protected] [[email protected]] on behalf of Vikram Bhagat [[email protected]]
Sent: Monday, February 02, 2015 3:12 PM
To: EPICS Tech-Talk
Subject: Read record field in asynDriver
Hello,
How i can read value of record field in the asynDriver?
In the asynDriver based EPICS driver, i want to set some parameter based on NEML field of waveform record, how it is possible?
One more thing, in my driver i have several waveform records with different asyn reson and each have different value set in NEML. for each record i have to set configuration parameter differently.
Thanks
Vikram
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