1COMEDI_DIGITAL_TRIGG(3)        Comedi reference        COMEDI_DIGITAL_TRIGG(3)
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NAME

6       comedi_digital_trigger_enable_edges - set digital trigger edge
7       detection
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SYNOPSIS

10       #include <comedilib.h>
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12       int comedi_digital_trigger_enable_edges(comedi_t * device,
13                                               unsigned int subdevice,
14                                               unsigned int trigger_id,
15                                               unsigned int base_input,
16                                               unsigned int rising_edge_inputs,
17                                               unsigned int falling_edge_inputs);
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STATUS

20       alpha
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DESCRIPTION

23       This function enables edge detection for a digital trigger on a
24       subdevice. If the subdevice supports several digital triggers, the
25       trigger_id selects one. The rising_edge_inputs and falling_edge_inputs
26       parameters are bit fields that enable (1) or disable (0) rising and
27       falling edge detection on a set of (up to) 32 inputs. The
28       least-significant bit corresponds to the input specified by the
29       base_input parameter, with subsequent bits corresponding to subsequent
30       inputs.
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32       Successive calls to this function have an cumulative effect, which
33       allows digital triggers to be set up for more than 32 inputs. There may
34       also be a cumulative effect with calls to
35       comedi_digital_trigger_enable_levels if the digital trigger supports a
36       combination of edge and level triggering. Due to the cumulative effect,
37       it may be necessary to call comedi_digital_trigger_disable to clear the
38       old settings before reconfiguring the digital trigger inputs.
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40       A digital trigger may support edge detection, level detection, both at
41       different times, or both at the same time. If it supports both but not
42       at the same time, configuring edge triggers will disable any previous
43       level triggers, or vice versa.
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45       This function is only useable on subdevices that provide support for
46       the INSN_CONFIG_DIGITAL_TRIG configuration instruction, and only if the
47       digital trigger supports edge detection.
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RETURN VALUE

50       0 on success, -1 on error.
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AUTHORS

53       David Schleef <ds@schleef.org>
54           Author.
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56       Frank Mori Hess <fmhess@users.sourceforge.net>
57           Author.
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59       Herman Bruyninckx <Herman.Bruyninckx@mech.kuleuven.ac.be>
60           Author.
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62       Bernd Porr <tech@linux-usb-daq.co.uk>
63           Author.
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65       Ian Abbott <abbotti@mev.co.uk>
66           Author.
67
68       Éric Piel <piel@delmic.com>
69           Author.
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72       Copyright © 1998-2003 David Schleef
73       Copyright © 2001-2003, 2005, 2008 Frank Mori Hess
74       Copyright © 2002-2003 Herman Bruyninckx
75       Copyright © 2012 Bernd Porr
76       Copyright © 2012 Ian Abbott
77       Copyright © 2012, 2015 Éric Piel
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79       This document is part of Comedilib. In the context of this document,
80       the term "source code" as defined by the license is interpreted as the
81       XML source.
82
83       This library is free software; you can redistribute it and/or modify it
84       under the terms of the GNU Lesser General Public License as published
85       by the Free Software Foundation, version 2.1 of the License.
86
87       This library is distributed in the hope that it will be useful, but
88       WITHOUT ANY WARRANTY; without even the implied warranty of
89       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
90       General Public License for more details.
91
92       You should have received a copy of the GNU Lesser General Public
93       License along with this library; if not, write to the Free Software
94       Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
95       USA.
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100Comedi                            05/11/2017           COMEDI_DIGITAL_TRIGG(3)
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