comedi_config man page

comedi_config — COMEDI configuration utility


comedi_config [-vVq] /dev/comediN <driver> [<option1>[,<option2>...]]


comedi_config is used to configure comedi drivers. You must have comedi support compiled into your kernel or loaded as a separate module in order to use this utility. Each control and measurement device is associated with a particular comedi device file /dev/comediN, where N is 0,1,2,3, etc. Comedi_config allows you to associate a particular driver and device with a comedi device file, and also configure driver parameters for the particular device.

Comedi_config can be used with optional parameters which are driver dependent.  Parameters are specified by comma-delimited list of integers.  The integers may be expressed as decimal, hexidecimal (starting with 0x) or octal (stating with 0).  In addition, a parameter may be left blank, indicating 0.  PCI-based devices typically require no parameters, although some allow you to specify the bus and slot of the card to configure as the first two parameters. ISA-based devices typically use the first and second parameters to indicate I/O base address and interrupt level.

More information about the parameters required by individual drivers can be found in the comedi documentation, in the file drivers.txt.


comedi_config recognizes the following options:

-q, --quiet don't print output while running.
-v, --verbose print verbose output while running.
-V, --version print version number and exit.
-r, --remove remove previously configured driver.
--read-buffer num

set read buffer size to num kilobytes.  The default size is 64k.

--write-buffer num

set write buffer size to num kilobytes.  The default size is 64k.

-i, --init-data, --init-data0 file

upload initialization data (typically firmware) from file to board.

--init-data1 file
--init-data2 file
--init-data3 file

Some drivers require more than one file for initialization  data.  Use these options to specify additional initialization data files.   See the driver-specific documentation for further details.

Configuration File

[This section has not been implemented yet.]

A list of device configurations can be put into the file /etc/comedi.conf.  This file takes the form

<device> <driver> <param1>,<param2>,...

These configurations will be read and performed when the switch -a is used.  This is potentially useful when run from an initialization script.


A National Instruments PCI-MIO E series board can be configured to use /dev/comedi0 using the command:

comedi_config /dev/comedi0 ni_pcimio

A National Instruments AT-MIO E series board can be configured to use /dev/comedi3 using the command:

comedi_config /dev/comedi3 ni_atmio 0x220,3

This tells the driver that the board is configured for I/O base 0x220 and IRQ 3.

Additional Information

Additional text documentation can be found in /usr/doc/comedilib-0.7.11. The current version of Comedi and Comedilib can be obtained from  The Comedi web site is located at

See Also





David Schleef, <>

Referenced By