NAME

       comedi_digital_trigger_enable_edges - set digital trigger edge detection

SYNOPSIS

       #include <comedilib.h>

       int comedi_digital_trigger_enable_edges(comedi_t * device, unsigned int subdevice,
                                               unsigned int trigger_id, unsigned int base_input,
                                               unsigned int rising_edge_inputs,
                                               unsigned int falling_edge_inputs);

STATUS

       alpha

DESCRIPTION

       This function enables edge detection for a digital trigger on a subdevice. If the
       subdevice supports several digital triggers, the trigger_id selects one. The
       rising_edge_inputs and falling_edge_inputs parameters are bit fields that enable (1) or
       disable (0) rising and falling edge detection on a set of (up to) 32 inputs. The
       least-significant bit corresponds to the input specified by the base_input parameter, with
       subsequent bits corresponding to subsequent inputs.

       Successive calls to this function have an cumulative effect, which allows digital triggers
       to be set up for more than 32 inputs. There may also be a cumulative effect with calls to
       comedi_digital_trigger_enable_levels if the digital trigger supports a combination of edge
       and level triggering. Due to the cumulative effect, it may be necessary to call
       comedi_digital_trigger_disable to clear the old settings before reconfiguring the digital
       trigger inputs.

       A digital trigger may support edge detection, level detection, both at different times, or
       both at the same time. If it supports both but not at the same time, configuring edge
       triggers will disable any previous level triggers, or vice versa.

       This function is only useable on subdevices that provide support for the
       INSN_CONFIG_DIGITAL_TRIG configuration instruction, and only if the digital trigger
       supports edge detection.

RETURN VALUE

       0 on success, -1 on error.

AUTHORS

       David Schleef <ds@schleef.org>
           Author.

       Frank Mori Hess <fmhess@users.sourceforge.net>
           Author.

       Herman Bruyninckx <Herman.Bruyninckx@mech.kuleuven.ac.be>
           Author.

       Bernd Porr <tech@linux-usb-daq.co.uk>
           Author.

       Ian Abbott <abbotti@mev.co.uk>
           Author.

       Éric Piel <piel@delmic.com>
           Author.

COPYRIGHT

       Copyright © 1998-2003 David Schleef
       Copyright © 2001-2003, 2005, 2008 Frank Mori Hess
       Copyright © 2002-2003 Herman Bruyninckx
       Copyright © 2012 Bernd Porr
       Copyright © 2012 Ian Abbott
       Copyright © 2012, 2015 Éric Piel

       This document is part of Comedilib. In the context of this document, the term "source
       code" as defined by the license is interpreted as the XML source.

       This library is free software; you can redistribute it and/or modify it under the terms of
       the GNU Lesser General Public License as published by the Free Software Foundation,
       version 2.1 of the License.

       This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
       without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
       See the GNU Lesser General Public License for more details.

       You should have received a copy of the GNU Lesser General Public License along with this
       library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
       Boston, MA 02111-1307 USA.