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

Subject: Re: state notation code flags
From: Patrick Thomas <[email protected]>
To: [email protected]
Cc: [email protected]
Date: Fri, 02 Oct 2009 16:20:04 -0700
Actually this is simpler and does the same thing:

program sncTest

float set_maximum_velocity;
assign set_maximum_velocity to "{IFO}:{DRIVER}_SET_MAXIMUM_VELOCITY_{AXIS}";

float request_maximum_velocity;
assign request_maximum_velocity to "{IFO}:{DRIVER}_REQUEST_MAXIMUM_VELOCITY_{AXIS}";
monitor request_maximum_velocity;
evflag request_maximum_velocityEvent;
sync request_maximum_velocity request_maximum_velocityEvent;


ss ss1 {
	state init {
		when () {
			efClear(request_maximum_velocityEvent);

			request_maximum_velocity = 40;
			pvPut(request_maximum_velocity, SYNC);
			efClear(request_maximum_velocityEvent);

			if (efTest(request_maximum_velocityEvent)) {
				printf("flag1 set\n");
			}
			sleep(1);
			if (efTest(request_maximum_velocityEvent)) {
				printf("flag2 set\n");
			}

		} state wait
	}

	state wait {
		when () {
		} state wait
	}
}



Pete R. Jemian wrote:
sounds a bit off ... show the code

Patrick Thomas wrote:
I think I have it narrowed down. It appears that when I set variable1 equal to variable2 and variable2 has a flag synced to it (variable1 does not), and then do a pvPut on variable1, sometimes the flag is set on variable2 and sometimes it isn't. Am I correct? Why does this occur?

Thank you,
Patrick

Mark Rivers wrote:
Patrick,

Event flags can be explicitly set, which is typically used to allow
communication between state sets. Or event flags can be synced to a PV,
and will be set whenever a monitor is received for that PV, as in the
example I sent you.

You can use the efTest() function outside of a when statement, just like
any other function.

Mark


-----Original Message-----
From: Patrick Thomas [mailto:[email protected]] Sent: Thursday, October 01, 2009 5:20 PM
To: Mark Rivers
Cc: [email protected]
Subject: Re: state notation code flags

Hi Mark,

Are the flags on a monitored variable set whenever the monitored variable is used in the code, including a pvPut, pvGet, assignment, calculation, or print statement? Is there a way to test if the flag is set besides an efTest in a when statement?

Thank you,
Patrick

Mark Rivers wrote:
Hio Patrick,

Here are some code snippets from one of my SNL programs.  It has a
variable nelements assigned to a PV, and a monitor on that PV.  It has
an event flag, nelementsMon that is synced to nelements.  Whenever
nelements changes the event flag will be set. In the init state I clear
the event flag, just to be sure it is clear when the SNL code starts
running (after all PVs connect).  I then use efTestAndClear in a when
statement to take actions when that event flag is set, and to clear it.
This works fine for me.
int     nelements;   assign nelements    to "{P}{R}Nelements.VAL";
monitor nelements;
evflag nelementsMon;    sync nelements  nelementsMon;


    /* Initialize things when first starting */
    state init {
        when() {
            /* Clear all event flags */
...

            efClear(nelementsMon);
        } state monitor_inputs
    }


...

    state monitor_inputs {

...

        when(efTestAndClear(nelementsMon) && (nelements>=1)) {
            /* If nelements changes, then change endPulses to this
value,
             * since this is what the user normally wants.  endPulses
can be
             * changed again after changing nelements if this is
desired. */
            if (moveMode == MOVE_MODE_RELATIVE)
                endPulses = nelements;
            else
                endPulses = nelements-1;
            pvPut(endPulses);
        } state monitor_inputs
    }

Mark

________________________________

From: [email protected] on behalf of Patrick Thomas
Sent: Wed 9/30/2009 10:35 PM
To: [email protected]
Subject: state notation code flags



Hi,

I was wondering if there is a way to track at what point in the state
notation code evflags are getting set and cleared, or if someone could
clarify under what conditions they get set. I'm having trouble with
them
getting set somewhere and not being cleared, but I'm not sure where.

Thank you,
Patrick







References:
state notation code flags Patrick Thomas
RE: state notation code flags Mark Rivers
Re: state notation code flags Patrick Thomas
RE: state notation code flags Mark Rivers
Re: state notation code flags Patrick Thomas
Re: state notation code flags Pete R. Jemian

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