comedi_to_phys — convert sample to physical units
#include <comedilib.h>
double comedi_to_phys( | lsampl_t data, |
| comedi_range * range, | |
lsampl_t maxdata); |
Converts parameter data given in sample values
(lsampl_t, between 0 and
maxdata) into physical units
(double). The parameter range
represents the conversion information to use, and the parameter
maxdata represents the maximum possible data value for the
channel that the data was read. The mapping between physical units
is linear and assumes ideal converter characteristics.
Conversion of endpoint sample values, that is, sample values
equal to 0 or maxdata,
is affected by the Comedilib out-of-range
behavior (see function comedi_set_global_oor_behavior).
If the out-of-range behavior is set to
COMEDI_OOR_NAN,
endpoint values are converted to NAN. If the out-of-range
behavior is set to COMEDI_OOR_NUMBER, the endpoint values are
converted similarly to other values.
If there is an error, NAN is returned.