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

Subject: Re: Getting value of a PV from a subRecord function
From: Ned Arnold <[email protected]>
To: [email protected]
Cc: [email protected]
Date: Fri, 9 Jul 2010 15:16:16 -0500
Pawel -

The subroutine record fetches the values of the input links before it calls your user routine and stores them in fields a,b,c,...  with the previous values in la, lb, lc, ...

So, your code could look like this ...

long TestPrint(struct subRecord *psu) {

    if (psu->a != psu->la) {
        << input a changed >>
    }
    if (psu->a) {
        << input a is non-zero >>
    }
    if (psu->b != psu->lb) {
        << input b changed >>
    }
   if (psu->b) {
        << input b is non-zero >>
    }

return o;
}


On Jul 9, 2010, at 1:53 PM, [email protected] wrote:

> Hello,
> 
> I'm new to EPICS and I've been trying to write some simple programs just
> to get to know the software.
> 
> Let me start with the database records I'm currently using:
> 
> record(bi,"$(user):goSub0") {
> 	field(DESC,"Start Subroutine0")
> 	field(DTYP,"Soft Channel")
> 	field(FLNK,"$(user):stopsub")
> 	field(ZNAM,"Go0")
> 	field(ONAM,"Nogo0")
> }
> record(bi,"$(user):goSub1") {
> 	field(DESC,"Start Subroutine1")
> 	field(DTYP,"Soft Channel")
> 	field(FLNK,"$(user):stopsub")
> 	field(ZNAM,"Go1")
> 	field(ONAM,"Nogo1")
> }
> record(sub,"$(user):stopsub") {
> 	field(DESC,"SimpleTest")
> 	field(INAM,"SubInit")
> 	field(SNAM,"TestPrint")
> 	field(INPA,"$(user):goSub0.VAL")
>        field(INPB,"$(user):goSub1.VAL")
> 
> }
> 
> The idea is, whenever any of the goSubx changes the TestPrint function
> should be called. I'm using MEDM to create a simple GUI, where a button
> (Message Button) has its Control Channel set to goSubx.VAL with the press
> message set to 1.
> 
> As far as I know, this changes the value of goSub whenever I press the
> button.
> 
> The question is, having the TestPrint function:
> 
> long TestPrint(struct subRecord *psu) {
> 
> 	return 0;
> }
> 
> how can I determine which button was pressed? I wanted to check both
> inputs and see which goSubx.VAL == 1 but I don't know how to get to the
> biRecord pointer using the subRecord pointer. Is there any way to do this?
> 
> Thanks in advance for your help.
> 
> Kind Regards,
> Pawel Predki
> 
> 



Replies:
Re: Getting value of a PV from a subRecord function PaweÅ PrÄdki
References:
Getting value of a PV from a subRecord function ppredki

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