COMEDI - COntrol and MEasurement Device Interface

Friday, 28 November 2008 22:49

The Comedi project develops open-source drivers, tools, and libraries for data acquisition. Requires a Linux 2.6 kernel. Comedi works with standard Linux kernels, but also with its real-time extensions RTAI and RTLinux/GPL.The project's source code is distributed in two packages, comedi and comedilib, and provides several Linux kernel modules and a user space library:

Comedi is a collection of drivers for a variety of common data acquisition plug-in boards. The drivers are implemented as a core Linux kernel module providing common functionality and individual low-level driver modules;
Comedilib is a user-space library that provides a developer-friendly interface to Comedi devices. Included in the Comedilib distribution is documentation, configuration and calibration utilities, and demonstration programs;
Kcomedilib is a Linux kernel module (distributed with Comedi) that provides the same interface as Comedilib in kernel space, suitable for real-time tasks. It is effectively a "kernel library" for using Comedi from real-time tasks.
Comedirecord is a simple program to record data from a comedi device. Its philosophy is to save the data in its original form at the maximum sampling rate but allows comfortable viewing of the data during an experiment. An IIR notch filter has been implemented to filter out unwanted hum. A DC filter can be switched on which removes the DC from the plot which is useful when observing small voltage changes at a high gain.

Current supported hardware here.

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