comedi_config(8) 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.


[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 text documentation can be found in /usr/share/doc/libcomedi-dev. The current version of Comedi and Comedilib can be obtained from The Comedi web site is located at




David Schleef, <[email protected]>