---
name: "comedi_calibrate"
section: "8"
platform: "linux"
package: "libcomedi0t64"
version: "0.11.0+5-1.3+b1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/comedi_calibrate"
---

# comedi\_calibrate(8)

COMEDI calibration utility

## NAME

**comedi\_calibrate** - COMEDI calibration utility

## SYNOPSIS

**comedi\_calibrate** \[-f /dev/comediN\]\

## DESCRIPTION

**comedi\_calibrate** is used to autocalibrate **comedi** devices.  Some **comedi** devices have the ability to measure internal stable voltage references and control gains and offsets using programmable DACs.  On these devices, **comedi\_calibrate** determines the proper values to feed into the programmable calibration DACs.  These calibration settings are then saved to a file, which can be fed to comedi\_apply\_calibration() and related functions.

If comedi\_calibrate finds an existing calibration file, it will not perform a new calibration by default.  It will simply read its calibration information from the file. This behaviour may be overridden with the **--calibrate** option, to force a new calibration to be performed.

After obtaining the calibration information for the board, comedi\_calibrate will then apply a calibration setting appropriate for the specified subdevice, channel, and range (see the **--subdevice** , **--channel** , and **--range** options below).  See the comedilib documentation for comedi\_apply\_calibration() for more information.

**comedi\_calibrate** prints a lot of debugging information as it runs.

## LIMITATIONS

**comedi\_calibrate** only works on boards that it understands. For boards that are known to have autocalibration ability, but are not currently supported, **comedi\_calibrate** will output basic debugging information that is useful for the author to add support for your device.  Please send this output to him.

## EXAMPLES

- **comedi\_calibrate --file** */dev/comediN*

  If no default calibration for */dev/comediN* already exists, perform a calibration and save results to default location.

- **comedi\_calibrate --calibrate**

  Perform a calibration, using existing calibration (if it exists) as starting point.

- **comedi\_calibrate --reset --calibrate**

  Perform a fresh calibration and save results to default location.

- **comedi\_calibrate --no-calibrate --subdevice** *subd.BI***--range** *range* **--save-file** *cal\_file*

  Apply calibration for subdevice *subd*, range *range*, using the settings in the calibration file *cal\_file*.

## OPTIONS

**comedi\_calibrate** recognizes the following options:

- **-a** *aref***, --aref** *aref*

  Along with **--channel**, **--range** and **--subdevice**, this specifies which calibration you want comedi\_calibrate leave applied to the board.  The default is 0.

- **--\[no-\]calibrate**

  Force calibration to be performed (or not). By default, comedi\_calibrate will only perform a new calibration if no existing calibration file is found (see **--save-file**).

- **-c** *channel,***--channel** *channel*

  Along with **--subdevice**, **--range** and **--aref**, this specifies which calibration you want comedi\_calibrate to leave applied to the board.  The default is 0.

- **--\[no-\]dump**

  Perform (or not) dump of various information about state of calibration prior to performing new calibration.

- **-f** */dev/comediN,***--file** */dev/comediN*

  Perform calibration on device **/dev/comediN**.

- **--help**

  Print help for options then exit.

- **-q, --quiet**

  Don't generate output to stdout.

- **-r** *range***, --range** *range*

  Along with **--channel**, **--subdevice** and **--aref**, this specifies which calibration you want comedi\_calibrate to leave applied to the board.  The default is 0.

- **--\[no-\]reset**

  Reset (or don't reset) calibration subdevice to a reasonable starting point before performing calibration.  The default is **--no-reset**.  If **--no-reset** is used, the calibration routine will try to use an existing calibration (see **--save-file**) as a starting point. This is useful if a single calibration pass is not sufficient, and you wish to perform another calibration pass starting from the results of the previous pass.

- **--\[no-\]results**

  Perform (or not) dump of various information about state of calibration after performing new calibration.

- **-S** *file***, --save-file** *file*

  Save calibration information to specified file, instead of default location.  If the file already exists, comedi\_calibrate will also use its contents as a starting point for the calibration pass (see **--no-reset**).

- **-s** *subdevice***, --subdevice** *subdevice*

  Along with **--channel**, **--range** and **--aref**, this specifies which calibration you want comedi\_calibrate to leave applied to the board.  The default is 0.

- **-v, --verbose**

  Generate more verbose output to stdout, can be specified multiple times

## SEE ALSO

[**comedi**(7)](/comedi/7.md)

## VERSION

0\.7.x

## AUTHOR

David Schleef, \<ds@schleef.org\>

Frank Mori Hess, \<fmhess@users.sourceforge.net\>