calibration.h

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#ifndef __ANALOGY_CALIBRATION_H__
#define __ANALOGY_CALIBRATION_H__

/*
 * internal definitions between the xenomai utils and the library.
 * no need to expose them to the USER
 *
 */
#define ELEMENT_FIELD_FMT       "%s_%d:%s"
#define ELEMENT_FMT             "%s:%s"
#define COEFF_FMT               ELEMENT_FIELD_FMT"_%d"

#define PLATFORM_STR            "platform"
#define CALIBRATION_SUBD_STR    "calibration"
#define MEMORY_SUBD_STR         "memory"
#define AI_SUBD_STR             "analog_input"
#define AO_SUBD_STR             "analog_output"

#define INDEX_STR       "index"
#define ELEMENTS_STR    "elements"
#define CHANNEL_STR     "channel"
#define RANGE_STR       "range"
#define EXPANSION_STR   "expansion_origin"
#define NBCOEFF_STR     "nbcoeff"
#define COEFF_STR       "coeff"
#define BOARD_STR       "board_name"
#define DRIVER_STR      "driver_name"

struct polynomial {
        double expansion_origin;
        double *coefficients;
        int nb_coefficients;
        int order;
};

struct subdevice_calibration_node {
        struct holder node;
        struct polynomial *polynomial;
        unsigned channel;
        unsigned range;
};

void write_calibration_file(FILE *dst, struct listobj *l,
                            struct a4l_calibration_subdev *subd,
                            a4l_desc_t *desc);

#endif