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The doc/drivers.txt file was updated on 2022-12-01 with some changes to
the section on the pcm3724 driver.

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October 19, 2020 13:13


The Linux Control and Measurement Device Interface Library

David Schleef

About Comedi

Comedi is a collection of drivers for data acquisition hardware. These drivers work with Linux, and also with Linux combined with the real-time extensions RTAI and RTLinux. The Comedi core, which ties all the driver together, allows applications to be written that are completely hardware independent.

Comedi supports a variety of data acquisition hardware; an incomplete list can be found in the Comedi source.

This distribution contains only the user-space library. You will almost certainly also want to download the Comedi kernel modules found in the comedi tarball. Also, the calibration programs comedi_calibrate and comedi_soft_calibrate can be found in the comedi_calibrate tarball. A few boards also need firmware found in the comedi-nonfree-firmware tarball.


Installation instructions are found in

Mailing List

Questions about Comedi and Comedilib should be sent to the Comedi mailing list, It is necessary to join the group before posting (see below). It is also possible to post to the list using the web interface (see below). Mailing the maintainer directly is always acceptable, but since the mailing list is archived and questions are often answered more quickly by others, the mailing list is preferred.

To subscribe to and unsubscribe from the mailing list, or to read or post messages via the web interface, go to Alternatively, you can send a blank email to to subscribe, or to to unsubscribe (making sure the "From:" email address matches the address you originally subscribed with!).

Traffic on the list is light, and mainly questions/answers about comedi installation, bugs, and programming. General questions about data acquisition are also welcome.

More Information

Comedi also has a web page at from where updated versions may be downloaded.

Often bugfixes and new features that are not in the current release can be found in the Git repository. Instructions for access to the Comedi and Comedilib repositories can be found at Git snapshots for Comedilib can be created automatically at The Git repository can be cloned locally using:

git clone

The Git repository was previously hosted at A previously cloned repository may need its URL updating to the current repository on as follows:

cd /path/to/comedilib
git remote set-url origin

Comedilib may be freely distibuted and modified in accordance with the GNU Lesser General Public License. Portions of the Comedilib distribution fall under different licenses; see the individual files for details.

The person behind all this misspelled humor is David Schleef