comedi_get_hardcal_converter — get converter for hardware-calibrated subdevice


#include <comedilib.h>
int comedi_get_hardcal_converter(comedi_t * device,
 unsigned subdevice,
 unsigned channel,
 unsigned range,
 enum comedi_conversion_direction direction,
 comedi_polynomial_t * converter);




The function comedi_get_hardcal_converter initializes the comedi_polynomial_t pointed to by converter so it can be passed to either comedi_to_physical, or comedi_from_physical. The result can be used to convert data from the specified subdevice, channel, and range. The direction parameter specifies whether converter will be passed to comedi_to_physical or comedi_from_physical.

This function initializes the comedi_polynomial_t pointed to by converter as a simple linear function with no calibration information, appropriate for boards which do their gain/offset/nonlinearity corrections in hardware. If your board needs calibration to be performed in software by the host computer, use comedi_get_softcal_converter instead. A subdevice will advertise the fact that it depends on a software calibration with the SDF_SOFT_CALIBRATED subdevice flag.

The result of this function will only depend on the channel parameter if either comedi_range_is_chan_specific or comedi_maxdata_is_chan_specific returns true for the specified subdevice.

Return value

Returns 0 on success, -1 on failure.