---
name: "comedi_sv_init"
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_sv_init"
---

# comedi\_sv\_init(3)

slowly-varying inputs

## NAME

comedi\_sv\_init - slowly-varying inputs

## SYNOPSIS

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

**int comedi\_sv\_init(comedi\_sv\_t \*** *sv***, comedi\_t \*** *device***, unsigned int** *subdevice***, unsigned int** *channel***);**

## STATUS

deprecated

## DESCRIPTION

The function **comedi\_sv\_init** initializes the slow varying Comedi structure pointed to by *sv* to use the device *device*, the analog input subdevice *subdevice*, and the channel *channel*. The slow varying Comedi structure is used by **comedi\_sv\_measure** to accurately measure an analog input by averaging over many samples. The default number of samples is 100.

## RETURN VALUE

This function returns 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.