SYNOPSIS
comedi_calibrate [-f /dev/comediN]DESCRIPTION
comedi_calibrate is used to autocalibrate comedi devices. Some comedi devices have the ability to measure internal stable voltage references and control gains and offsets using programmable DACs. On these devices, comedi_calibrate determines the proper values to feed into the programmable calibration DACs. These calibration settings are then saved to a file, which can be fed to comedi_apply_calibration() and related functions.If comedi_calibrate finds an existing calibration file, it will not perform a new calibration by default. It will simply read its calibration information from the file. This behaviour may be overridden with the --calibrate option, to force a new calibration to be performed.
After obtaining the calibration information for the board, comedi_calibrate will then apply a calibration setting appropriate for the specified subdevice, channel, and range (see the --subdevice , --channel , and --range options below). See the comedilib documentation for comedi_apply_calibration() for more information.
comedi_calibrate prints a lot of debugging information as it runs.
LIMITATIONS
comedi_calibrate only works on boards that it understands. For boards that are known to have autocalibration ability, but are not currently supported, comedi_calibrate will output basic debugging information that is useful for the author to add support for your device. Please send this output to him.
EXAMPLES
- comedi_calibrate --file /dev/comediN
-
If no default calibration for /dev/comediN already exists,
perform a calibration
and save results to default location.
- comedi_calibrate --calibrate
-
Perform a calibration, using existing calibration (if it exists) as
starting point.
- comedi_calibrate --reset --calibrate
-
Perform a fresh calibration and save results to default location.
- comedi_calibrate --no-calibrate --subdevice subd --range range --save-file cal_file
-
Apply calibration for subdevice subd, range range, using
the settings in the calibration file cal_file.
OPTIONS
comedi_calibrate recognizes the following options:
- -a aref, --aref aref
-
Along with --channel, --range
and --subdevice, this specifies which calibration you want comedi_calibrate
leave applied to the board. The default is 0.
- --[no-]calibrate
-
Force calibration to be performed (or not).
By default, comedi_calibrate will only perform a new calibration if
no existing calibration file is found (see --save-file).
- -c channel,--channel channel
-
Along with --subdevice, --range
and --aref, this specifies which calibration you want comedi_calibrate
to leave applied to the board. The default is 0.
- --[no-]dump
-
Perform (or not) dump of various information about
state of calibration prior to performing new calibration.
- -f /dev/comediN,--file /dev/comediN
-
Perform calibration on device /dev/comediN.
- --help
-
Print help for options then exit.
- -q, --quiet
-
Don't generate output to stdout.
- -r range, --range range
-
Along with --channel, --subdevice
and --aref, this specifies which calibration you want comedi_calibrate
to leave applied to the board. The default is 0.
- --[no-]reset
-
Reset (or don't reset) calibration subdevice to
a reasonable starting point before
performing calibration. The default is --no-reset. If
--no-reset is used, the calibration routine will try to use
an existing calibration (see --save-file) as a starting point.
This is useful if
a single calibration
pass is not sufficient, and you wish to perform another calibration
pass starting from the results of the previous pass.
- --[no-]results
-
Perform (or not) dump of various information about
state of calibration after performing new calibration.
- -S file, --save-file file
-
Save calibration information to specified file,
instead of default location. If the file already exists, comedi_calibrate
will also use its contents as a starting point for the calibration pass (see
--no-reset).
- -s subdevice, --subdevice subdevice
-
Along with --channel, --range
and --aref, this specifies which calibration you want comedi_calibrate
to leave applied to the board. The default is 0.
- -v, --verbose
-
Generate more verbose output to stdout, can be specified multiple times
VERSION
0.7.x