Provided by: libcomedi-dev_0.10.1-1ubuntu2_amd64 
NAME
comedi_get_subdevice_flags - properties of subdevice
SYNOPSIS
#include <comedilib.h>
int comedi_get_subdevice_flags(comedi_t * device, unsigned int subdevice);
DESCRIPTION
The function comedi_get_subdevice_flags returns a bitfield describing the capabilities of
the specified subdevice subdevice of the Comedi device device. If there is an error, -1 is
returned, and the Comedilib error value is set.
┌────────────────────────────┬──────────────────────┬─────────────────────────────────────┐
│ Subdevice Flag │ Value (hex) │ Description │
├────────────────────────────┼──────────────────────┼─────────────────────────────────────┤
│ SDF_BUSY │ 0x00000001 │ The subdevice is busy │
│ │ │ performing an │
│ │ │ asynchronous command. A │
│ │ │ subdevice being “busy” │
│ │ │ is slightly different │
│ │ │ from the “running” state │
│ │ │ flagged by SDF_RUNNING. │
│ │ │ A “running” subdevice is │
│ │ │ always “busy”, but a │
│ │ │ “busy” subdevice is not │
│ │ │ necessarily “running”. │
│ │ │ For example, suppose an │
│ │ │ analog input command has │
│ │ │ been completed by the │
│ │ │ hardware, but there are │
│ │ │ still samples in │
│ │ │ Comedi's buffer waiting │
│ │ │ to be read out. In this │
│ │ │ case, the subdevice is │
│ │ │ not “running”, but is │
│ │ │ still “busy” until all │
│ │ │ the samples are read out │
│ │ │ or comedi_cancel is │
│ │ │ called. │
├────────────────────────────┼──────────────────────┼─────────────────────────────────────┤
│ SDF_BUSY_OWNER │ 0x00000002 │ The subdevice is “busy”, │
│ │ │ and the command it is │
│ │ │ running was started by │
│ │ │ the current process. │
├────────────────────────────┼──────────────────────┼─────────────────────────────────────┤
│ SDF_LOCKED │ 0x00000004 │ The subdevice has been │
│ │ │ locked by comedi_lock. │
├────────────────────────────┼──────────────────────┼─────────────────────────────────────┤
│ SDF_LOCK_OWNER │ 0x00000008 │ The subdevice is locked, │
│ │ │ and was locked by the │
│ │ │ current process. │
├────────────────────────────┼──────────────────────┼─────────────────────────────────────┤
│ SDF_MAXDATA │ 0x00000010 │ The maximum data value │
│ │ │ for the subdevice │
│ │ │ depends on the channel. │
├────────────────────────────┼──────────────────────┼─────────────────────────────────────┤
│ SDF_FLAGS │ 0x00000020 │ The subdevice flags │
│ │ │ depend on the channel │
│ │ │ (unfinished/broken │
│ │ │ support in library). │
├────────────────────────────┼──────────────────────┼─────────────────────────────────────┤
│ SDF_RANGETYPE │ 0x00000040 │ The range type depends │
│ │ │ on the channel. │
├────────────────────────────┼──────────────────────┼─────────────────────────────────────┤
│ SDF_CMD │ 0x00001000 │ The subdevice supports │
│ │ │ asynchronous commands. │
├────────────────────────────┼──────────────────────┼─────────────────────────────────────┤
│ SDF_SOFT_CALIBRATED │ 0x00002000 │ The subdevice relies on │
│ │ │ the host to do │
│ │ │ calibration in software. │
│ │ │ Software calibration │
│ │ │ coefficients are │
│ │ │ determined by the │
│ │ │ comedi_soft_calibrate │
│ │ │ utility. See the │
│ │ │ description of the │
│ │ │ comedi_get_softcal_converter │
│ │ │ function for more │
│ │ │ information. │
├────────────────────────────┼──────────────────────┼─────────────────────────────────────┤
│ SDF_READABLE │ 0x00010000 │ The subdevice can be read │
│ │ │ (e.g. analog input). │
├────────────────────────────┼──────────────────────┼─────────────────────────────────────┤
│ SDF_WRITABLE │ 0x00020000 │ The subdevice can be written │
│ │ │ to (e.g. analog output). │
├────────────────────────────┼──────────────────────┼─────────────────────────────────────┤
│ SDF_INTERNAL │ 0x00040000 │ The subdevice does not have │
│ │ │ externally visible lines. │
├────────────────────────────┼──────────────────────┼─────────────────────────────────────┤
│ SDF_GROUND │ 0x00100000 │ The subdevice supports │
│ │ │ analog reference │
│ │ │ AREF_GROUND. │
├────────────────────────────┼──────────────────────┼─────────────────────────────────────┤
│ SDF_COMMON │ 0x00200000 │ The subdevice supports │
│ │ │ analog reference │
│ │ │ AREF_COMMON. │
├────────────────────────────┼──────────────────────┼─────────────────────────────────────┤
│ SDF_DIFF │ 0x00400000 │ The subdevice supports │
│ │ │ analog reference AREF_DIFF. │
├────────────────────────────┼──────────────────────┼─────────────────────────────────────┤
│ SDF_OTHER │ 0x00800000 │ The subdevice supports │
│ │ │ analog reference AREF_OTHER │
├────────────────────────────┼──────────────────────┼─────────────────────────────────────┤
│ SDF_DITHER │ 0x01000000 │ The subdevice supports │
│ │ │ dithering (via the │
│ │ │ CR_ALT_FILTER chanspec │
│ │ │ flag). │
├────────────────────────────┼──────────────────────┼─────────────────────────────────────┤
│ SDF_DEGLITCH │ 0x02000000 │ The subdevice supports │
│ │ │ deglitching (via the │
│ │ │ CR_ALT_FILTER chanspec │
│ │ │ flag). │
├────────────────────────────┼──────────────────────┼─────────────────────────────────────┤
│ SDF_RUNNING │ 0x08000000 │ An asynchronous command is │
│ │ │ running. You can use this │
│ │ │ flag to poll for the │
│ │ │ completion of an output │
│ │ │ command. │
├────────────────────────────┼──────────────────────┼─────────────────────────────────────┤
│ SDF_LSAMPL │ 0x10000000 │ The subdevice uses the │
│ │ │ 32-bit lsampl_t type instead │
│ │ │ of the 16-bit sampl_t for │
│ │ │ asynchronous command data. │
├────────────────────────────┼──────────────────────┼─────────────────────────────────────┤
│ SDF_PACKED │ 0x20000000 │ The subdevice uses bitfield │
│ │ │ samples for asynchronous │
│ │ │ command data, one bit per │
│ │ │ channel (otherwise it uses │
│ │ │ one sampl_t or lsampl_t per │
│ │ │ channel). Commonly used for │
│ │ │ digital subdevices. │
└────────────────────────────┴──────────────────────┴─────────────────────────────────────┘
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.
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
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.