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<== Date ==> <== Thread ==>
Subject: Re: Questions from a new EPICS user...
From: Till Straumann <[email protected]>
To: [email protected]
Cc: [email protected]
Date: Thu, 09 Oct 2003 20:26:55 -0700
Hi Steven.

Welcome :-)

Just a quick answer to your first question:

This is considered a "feature" (which also confused me in the early days).
Data shouldn't be written out as a result of the widget losing the focus
(which could happen accidentally). Instead, EDM (like dm2k in earlier
days) expects you to explicitely 'commit' your modifications by hitting
the 'Enter' key. If a text entry loses focus prior to you hitting 'Enter' your
modifications are reverted (which can be annoying but is safer).
EDM has no way to know about a relation between your 'Dial' button
and the Text Entry. They are connected to two different PVs and EDM
sees those as two totally independent entities.

Regarding the segfaults: use a debugger and submit stack traces etc.

HTH

-- Till

[email protected] wrote:

I'm a new EPICS user and am in the initial stages of learning how to use
it.  I wonder if anyone could comment on some behaviour that I'm seeing in
a small EPICS application I've just written.  I'd be interested to know if
similar things happen in anyone else's environment.

The application is just a simple driver to dial out a phone number on a
modem attached to the serial port.   It's driven by stringout records in
the database using a very primitive device driver to send commands out to
the modem.

It's based on the GPIB Driver tutorial written by Eric Norum.

The application uses an EDM user interface to allow a telephone number to
be entered into a text field with command buttons used to dial that number
or hangup.  The behaviour I'm questioning is as follows:

1) I've noticed that you need to hit Tab or Enter on the text field prior
to pressing the Dial button or else the field isn't updated in the
database.  I would have thought that just pressing the button would have
caused the text field to lose focus and update the record but this doesn't
seem to happen.

2) I am seeing Segmentation Faults at various times.  In particular, this
sometimes happens when I exit from EDM and also when I exit the iocsh
command shell.  In addition, entering the command dbgf with no parameters
causes a Segmentation Fault.

I'm using the following software versions:

Redhat Linux 9.0
EPICS Base 3.14.3
GPIBcore 1-2
EDM 1-9-6q

Thanks,

Steve Banks
Australian Synchrotron Project
Department of Infrastructure
Level 18, 80 Collins Street
Melbourne   VIC   3000
tel:  +613 9655 6303
fax:  +613 9655 8666
web: www.synchrotron.vic.gov.au






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