Advantech PCI-1736UP Specifikace stáhnout pdf (Strana 61)

Comedi

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Description

Converts data given in Comedi’s integer sample values (lsampl_t, between 0 and maxdata) into physical units (double). The

conversion_polynomial parameter is obtained from either comedi_get_hardcal_converter() or comedi_get_-

softcal_converter(). No range checking of the input data is performed. It is up to you to check for data values of 0 or

maxdata if you want to detect possibly out-of-range readings.

Return value

Physical value corresponding to the input sample value.

5.4.1.32 comedi_unlock

comedi_unlock — subdevice reservation

Synopsis

#include <comedilib.h>

int comedi_unlock(comedi_t * device, unsigned int subdevice);

Description

The function comedi_unlock() releases a subdevice locked by comedi_lock().

Return value

0 on success, otherwise -1.

5.4.2 Asynchronous commands

5.4.2.1 comedi_cancel

comedi_cancel — stop streaming input/output in progress

Synopsis

#include <comedilib.h>

int comedi_cancel(comedi_t * device, unsigned int subdevice);

Description

The function comedi_cancel() can be used to stop a command previously started by comedi_command() which is still in

progress on the subdevice indicated by the parameters device and subdevice.

Return value

If successful, 0 is returned, otherwise -1.

5.4.2.2 comedi_command

comedi_command — start streaming input/output

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Advantech PCI-1736UP Specifikace Strana 61