LUT.h

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#ifndef RENNSSELAERMOTORSPORT_LUT_H
#define RENNSSELAERMOTORSPORT_LUT_H
#include <stdbool.h>
#include <stdint.h>
 
/* Defines a mapping from one input to one output. */
typedef struct {
  /* Input value. */
  float input;
  /* Output value. */
  float output;
} point;
 
int point_compare(const void *a, const void *b);
 
bool point_is_between(const point *min, const point *max, float in);
 
#define TABLE_CAPACITY 64
 
/* Defines a interpolated table of multiple reference points, forming a
 * continuous mapping from inputs to outputs. */
typedef struct {
  /* Number of reference points. */
  uint16_t count_;
  /* Number of added reference points. */
  uint16_t added_;
  /* True if the table is initialized; cache for table_is_initialized. */
  bool initialized_;
  /* Reference points. */
  point points_[TABLE_CAPACITY];
} table;
 
bool table_init(table *table, uint16_t count);
 
bool table_add_reference_point(table *table, float in, float out);
 
bool table_is_initialized(table *table);
 
const point *table_min_point(table *table);
 
const point *table_max_point(table *table);
 
bool table_can_sample(table *table, float in);
 
bool table_sample(table *table, float in, float *out);
#endif // RENNSSELAERMOTORSPORT_LUT_H