---
name: "comedi_dio_config"
section: "3"
platform: "linux"
package: "libcomedi-dev"
version: "0.11.0+5-1.3+b1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/comedi_dio_config"
---

# comedi\_dio\_config(3)

change input/output properties of channel

## NAME

comedi\_dio\_config - change input/output properties of channel

## SYNOPSIS

```
#include <comedilib.h>
```

**int comedi\_dio\_config(comedi\_t \*** *device***, unsigned int** *subdevice***, unsigned int** *channel***, unsigned int** *direction***);**

## DESCRIPTION

The function **comedi\_dio\_config** configures individual channels in a digital I/O subdevice to be either input or output, depending on the value of *direction*. Valid directions are **COMEDI\_INPUT** or **COMEDI\_OUTPUT**.

Depending on the characteristics of the hardware device, multiple channels might be grouped together in hardware when configuring the input/output direction. In this case, a single call to **comedi\_dio\_config** for any channel in the group will affect the entire group.

## RETURN VALUE

If successful, 0 is returned, otherwise -1.

## 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.