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comedi_get_subdevice_flags - properties of subdevice
Contents
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.
Comedi 03/04/2025 COMEDI_GET_SUBDEVICE(3)
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.
┌─────────────────────────────┬───────────────────────────┬─────────────────────────────────────┐
│ SubdeviceFlag │ 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. │
└─────────────────────────────┴───────────────────────────┴─────────────────────────────────────┘
Name
comedi_get_subdevice_flags - properties of subdevice
Synopsis
#include<comedilib.h>intcomedi_get_subdevice_flags(comedi_t*device,unsignedintsubdevice);
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