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Comedi

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Buffering is another important aspect of device drivers: the acquired data has to be stored in such buffers, because, in general,

the application program cannot guarantee to always be ready to provide or accept data as soon as the interface board wants to do

a read or write operation. Comedi provides internal buffers for data being streamed to/from devices via Comedi commands. The

buffer sizes are user-adjustable.

2 Conﬁguration

This section assumes that you have successfully compiled and installed the Comedi software, that your hardware device is in

your computer, and that you know the relevant details about it, i.e., what kind of card it is, any jumper settings related to input

ranges, the I/O base address and IRQ for old non-plug-n-play boards, etc.

2.1 Conﬁguration

The good news is: on most systems PCI and USB based boards are conﬁgured automatically. The kernel will detect your data

acquisition devices, will load the appropriate kernel drivers and will create the /dev/comedi entries.

bp1@bp1-x61:~/sandbox/comedilib$ ls -l /dev/comedi0

crw-rw---- 1 root iocard 98, 0 2012-04-26 23:41 /dev/comedi0

crw-rw---- 1 root iocard 98, 48 2012-04-26 23:41 /dev/comedi0_subd0

crw-rw---- 1 root iocard 98, 49 2012-04-26 23:41 /dev/comedi0_subd1

Usually these devices belong to the group iocard as shown here. The only action you need to take is to become member of

this group and then the Comedi device is ready to be used.

Old ISA based cards need to be manually conﬁgured which is explained here. You only need to read on here if you have one of

these old cards. On embedded systems it might also be necessary to load the driver and then to conﬁgure the boards manually.

In general manual conﬁguration is done by running the comedi_conﬁg command (as root). Here is an example of how to use

the command (perhaps you should read its man page now):

comedi_config /dev/comedi0 labpc-1200 0x260,3

This command says that the ‘ﬁle’ /dev/comedi0 can be used to access the Comedi device that uses the labpc-1200 board,

and that you give it two run-time parameters (0x260 and 3). More parameters are possible, and their meaning is driver depen-

dant.

This tutorial goes through the process of conﬁguring Comedi for two devices, a National Instruments AT-MIO-16E-10, and a

Data Translation DT2821-F-8DI.

The NI board is plug-and-play. The current ni_atmio driver has kernel-level ISAPNP support, which is used by default if you

do not specify a base address. So you could simply run comedi_conﬁg as

comedi_config /dev/comedi0 ni_atmio

For the preceding comedi_conﬁg command to succeed, the ni_atmio kernel module must be loaded ﬁrst. For plug-n-play

boards on modern kernels, the appropriate comedi kernel modules should get loaded automatically when your computer is

booted. The modprobe command can be used to manually load/unload kernel modules, and lsmod will list all the currently

loaded modules.

For the Data Translation board, you need to know how the board’s jumpers are conﬁgured in order to specify the correct

comedi_conﬁg parameters. These parameters for the board are given in the kernel drivers section about the dt282x driver.

The card discussed here is a DT2821-f-8di. The entry for the dt282x driver tells you that the comedi_conﬁg parameters give

the driver the I/O base, IRQ, DMA 1, DMA 2, and in addition the states of the differential/single-ended and unipolar/bipolar

jumpers:

DT282X CONFIGURATION OPTIONS:

• [0] - I/O port base address

• [1] - IRQ

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 158 159

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