types.h

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#ifndef FIXED_POINT_TYPES_H
#define FIXED_POINT_TYPES_H

#include <stdint.h>

typedef int16_t mfrac_base;     
typedef int16_t frac_base;      
typedef int32_t dfrac_base;     
typedef int32_t efrac_base;     
typedef struct {
        mfrac_base v;
} mfrac;

typedef struct {
        frac_base v;
} frac;

typedef struct {
        dfrac_base v;
} dfrac;

typedef struct {
        efrac_base v;
} efrac;

static inline frac _frac(frac_base v)
{
        frac r = {v};
        return r;
}

static inline dfrac _dfrac(dfrac_base v)
{
        dfrac r = {v};
        return r;
}

static inline efrac _efrac(efrac_base v)
{
        efrac r = {v};
        return r;
}

#define MFRAC_BIT (16)  
#define FRAC_BIT (16)   
#define DFRAC_BIT (32)  
#define EFRAC_BIT (32)  
typedef frac frac_s16;  
typedef dfrac frac_s32; 
#define MFRAC_1_V (INT16_MAX >> 8)

#define MFRAC_minus1_V (INT16_MIN >> 8)

#define MFRAC_MAX_V INT16_MAX

#define MFRAC_MIN_V INT16_MIN

#define FRAC_1_V INT16_MAX

#define FRAC_0_5_V (-(INT16_MIN>>1))

#define FRAC_minus1_V INT16_MIN

#define FRAC_MAX_V INT16_MAX

#define FRAC_MIN_V INT16_MIN

#define DFRAC_1_V (-(INT32_MIN>>1))

#define DFRAC_0_5_V (-(INT32_MIN>>2))

#define DFRAC_almost1_V (-(INT32_MIN>>1)-1)

#define DFRAC_minus1_V (INT32_MIN>>1)

#define DFRAC_MAX_V INT32_MAX

#define DFRAC_MIN_V INT32_MIN

#define EFRAC_minus1_V ((efrac_base)FRAC_minus1_V)
#define EFRAC_1_V (-EFRAC_minus1_V)

#define EFRAC_MAX_V INT32_MAX
#define EFRAC_MIN_V INT32_MIN

static const frac FZero = {0};
static const dfrac DFZero = {0};
static const efrac EFZero = {0};

#define F_TO_REAL(real_type, n) (((real_type)(n.v))/(-(real_type)FRAC_minus1_V))

#define REAL_TO_F(f) (_frac(-f*FRAC_minus1_V))

#define DF_TO_REAL(real_type, n) (((real_type)(n.v))/((real_type)DFRAC_1_V))

#define REAL_TO_DF(f) (_dfrac(f*DFRAC_1_V))

#define EF_TO_REAL(real_type, n) (((real_type)(n.v))/((real_type)EFRAC_1_V))

#define REAL_TO_EF(f) (_efrac(f*EFRAC_1_V))

#define F_TO_DOUBLE(n) F_TO_REAL(double, n) 
#define DF_TO_DOUBLE(n) DF_TO_REAL(double, n)
#define EF_TO_DOUBLE(n) EF_TO_REAL(double, n)
#define F_TO_FLOAT(n) F_TO_REAL(float, n) 
#define DF_TO_FLOAT(n) DF_TO_REAL(float, n)
#define EF_TO_FLOAT(n) EF_TO_REAL(float, n)
#endif /* FIXED_POINT_TYPES_H */