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Fill in inverse polynomials for first order soft calibrations.

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This commit is contained in:
Frank Mori Hess 2006-08-31 18:09:27 +00:00
parent e48a8d91df
commit 881600a31e
1 changed files with 41 additions and 0 deletions
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41
lib/calib_yacc.y
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@ -21,8 +21,11 @@
USA.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include "libinternal.h"
#include <math.h>
#include <string.h>
#include <stdlib.h>
#include "calib_yacc.h"
@ -274,6 +277,43 @@ extern void _comedi_cleanup_calibration( comedi_calibration_t *file_contents )
free( file_contents );
}
static comedi_polynomial_t* alloc_inverse_linear_polynomial(const comedi_polynomial_t *polynomial)
{
if(polynomial->order != 1) return NULL;
comedi_polynomial_t *inverse = malloc(sizeof(comedi_polynomial_t));
memset(inverse, 0, sizeof(comedi_polynomial_t));
inverse->order = 1;
inverse->expansion_origin = polynomial->coefficients[0];
inverse->coefficients[0] = polynomial->expansion_origin;
inverse->coefficients[1] = 1. / polynomial->coefficients[1];
if(isfinite(inverse->coefficients[1]) == 0)
{
free(inverse);
return NULL;
}
return inverse;
}
static void fill_inverse_linear_polynomials(comedi_calibration_t *calibration)
{
unsigned i;
for(i = 0; i < calibration->num_settings; ++i)
{
if(calibration->settings[i].soft_calibration.to_phys)
{
if(calibration->settings[i].soft_calibration.from_phys == NULL)
{
calibration->settings[i].soft_calibration.from_phys =
alloc_inverse_linear_polynomial(calibration->settings[i].soft_calibration.to_phys);
}
}else if(calibration->settings[i].soft_calibration.from_phys)
{
calibration->settings[i].soft_calibration.to_phys =
alloc_inverse_linear_polynomial(calibration->settings[i].soft_calibration.from_phys);
}
}
}
EXPORT_ALIAS_DEFAULT(_comedi_parse_calibration_file,comedi_parse_calibration_file,0.7.20);
extern comedi_calibration_t* _comedi_parse_calibration_file( const char *cal_file_path )
{
@ -300,6 +340,7 @@ extern comedi_calibration_t* _comedi_parse_calibration_file( const char *cal_fil
}
calib_yylex_destroy(priv.yyscanner);
fclose( file );
fill_inverse_linear_polynomials(priv.parsed_file);
return priv.parsed_file;
}