[oopic] Re: events again

--- In oopic@yahoogroups.com, "rtstofer" <rstofer@...> wrote:
>
> --- In oopic@yahoogroups.com, "dogulas" <dogulas@> wrote:
> >
> >
> > Dennis,
> >
> > OOPic III+ Ver C.1.1+ Compiler 6.1.1
> >
> > I'm seeing similar squirrly behavior. I have a complex program
that
> > used an event triggered by a bumper switch. When the switch was
> > activated the event handler did not execute but the main loop
> stopped
> > executing as well. To track down what is wrong, I started out
with
> the
> > sample code in "Chapter 9 - Event Driven ProgrammingC". It
didn't
> work.
> > I was reading this thread and I wrote the following test program
> which
> > is very similar to your test:
> >
> > Dim BLINK As New oEvent
> > Dim WIRE As New oWire
> > Dim LED As New oDIO1
> >
> > Sub Main()
> > LED.IOLine = 20
> > LED.Direction = cvOutput
> > ' Call BLINK_Code()
> > WIRE.Input.Link(ooPIC.Hz1)
> > WIRE.Output.Link(BLINK.Operate)
> > WIRE.Operate = cvTrue
> > Do
> > Loop
> > End Sub
> >
> > Sub BLINK_Code()
> > LED = cvOn
> > ooPIC.Delay = 500
> > LED = cvOff
> > ooPIC.Delay = 500
> > End Sub
> >
> >
> > When I run it as is, nothing happens. The led does not light
up.
> I put
> > in the extra line to prove to myself that the problem was not in
> the led
> > and wierd behavior ensued. The led flashed on and off exactly
ten
> times
> > with a little pause during the eighth off period. The tenth on
> period
> > stays on contiuously. After the tenth flash, one of the servos
> moves
> > slightly. At this point, I have to reset the OOPic to reprogram
> it.
> > This behavior is repeatable.
> >
> > In my original complex program, everything execpt the event works
> fine.
> >
>
> Yes but... Do you know if event code is reentrant? Assuming your
> version of the compiler has OOPic.Delay in mS (it used to be 0.01
> second in V5) then your event code COULD take longer than the
> OOPic.1Hz trigger interval.
>
> I haven't made the transition to V6 so I don't know a lot about the
> issues but if I were doing the code above, I would start by cutting
> the delays to 250 to be absolutely certain the event code was
> complete before the next trigger.
>
> Richard
>

Richard,

Thanks for the reply.

Excellent point! The event must be taking slightly longer than one
second. I changed the delays to 250 and guess what? It now flashes
in one second cycles indefinately.

While that mystery is solved, the bigger question is: Why do I have
to call the BLINK_Code() as a subroutine first? Remember, when I
have that call statement commented out, the event handler is not
firing. Any thoughts on that?

Thanks,
Dogulas

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