Detailed Description

Types for storing fractional data.

sfract7 should be interpreted as signed 128ths.
fract8 should be interpreted as unsigned 256ths.
sfract15 should be interpreted as signed 32768ths.
fract16 should be interpreted as unsigned 65536ths.

Example: if a fract8 has the value "64", that should be interpreted as 64/256ths, or one-quarter.

accumXY types should be interpreted as X bits of integer, and Y bits of fraction.
E.g., accum88 has 8 bits of int, 8 bits of fraction

Classes
union	IEEE754binary32_t
	typedef for IEEE754 "binary32" float type internals More...

class	qfx< T, F, I >
	Template class for representing fractional ints. More...

Typedefs
typedef uint8_t	fract8
	ANSI: unsigned short _Fract.

typedef int8_t	sfract7
	ANSI: signed short _Fract.

typedef uint16_t	fract16
	ANSI: unsigned _Fract.

typedef int32_t	sfract31
	ANSI: signed long _Fract. 31 bits int, 1 bit fraction.

typedef uint32_t	fract32
	ANSI: unsigned long _Fract. 32 bits int, 32 bits fraction.

typedef int16_t	sfract15
	ANSI: signed _Fract.

typedef uint16_t	accum88
	ANSI: unsigned short _Accum. 8 bits int, 8 bits fraction.

typedef int16_t	saccum78
	ANSI: signed short _Accum. 7 bits int, 8 bits fraction.

typedef uint32_t	accum1616
	ANSI: signed _Accum. 16 bits int, 16 bits fraction.

typedef int32_t	saccum1516
	ANSI: signed _Accum. 15 bits int, 16 bits fraction.

typedef uint16_t	accum124
	no direct ANSI counterpart. 12 bits int, 4 bits fraction

typedef int32_t	saccum114
	no direct ANSI counterpart. 1 bit int, 14 bits fraction

typedef qfx< uint8_t, 4, 4 >	q44
	A 4.4 integer (4 bits integer, 4 bits fraction)

typedef qfx< uint8_t, 6, 2 >	q62
	A 6.2 integer (6 bits integer, 2 bits fraction)

typedef qfx< uint16_t, 8, 8 >	q88
	A 8.8 integer (8 bits integer, 8 bits fraction)

typedef qfx< uint16_t, 12, 4 >	q124
	A 12.4 integer (12 bits integer, 4 bits fraction)

Functions
	qfx< T, F, I >::qfx (float fx)
	Constructor, storing a float as a fractional int.

	qfx< T, F, I >::qfx (uint8_t _i, uint8_t _f)
	Constructor, storing a fractional int directly.

uint32_t	qfx< T, F, I >::operator* (uint32_t v)
	Multiply the fractional int by a value.

uint16_t	qfx< T, F, I >::operator* (uint16_t v)
	Multiply the fractional int by a value.

int32_t	qfx< T, F, I >::operator* (int32_t v)
	Multiply the fractional int by a value.

int16_t	qfx< T, F, I >::operator* (int16_t v)
	Multiply the fractional int by a value.

Typedef Documentation

◆ accum124

typedef uint16_t accum124

no direct ANSI counterpart. 12 bits int, 4 bits fraction

Definition at line 56 of file types.h.

◆ accum1616

typedef uint32_t accum1616

ANSI: signed _Accum. 16 bits int, 16 bits fraction.

Definition at line 54 of file types.h.

◆ accum88

typedef uint16_t accum88

ANSI: unsigned short _Accum. 8 bits int, 8 bits fraction.

Definition at line 52 of file types.h.

◆ fract16

typedef uint16_t fract16

ANSI: unsigned _Fract.

Range is 0 to 0.99998474121 in steps of 0.00001525878.
Should be interpreted as unsigned 65536ths.

Definition at line 40 of file types.h.

◆ fract32

typedef uint32_t fract32

ANSI: unsigned long _Fract. 32 bits int, 32 bits fraction.

Definition at line 44 of file types.h.

◆ fract8

typedef uint8_t fract8

ANSI: unsigned short _Fract.

Range is 0 to 0.99609375 in steps of 0.00390625.
Should be interpreted as unsigned 256ths.

Definition at line 30 of file types.h.

◆ q124

typedef qfx<uint16_t, 12,4> q124

A 12.4 integer (12 bits integer, 4 bits fraction)

Definition at line 51 of file qfx.h.

◆ q44

typedef qfx<uint8_t, 4,4> q44

A 4.4 integer (4 bits integer, 4 bits fraction)

Definition at line 45 of file qfx.h.

◆ q62

typedef qfx<uint8_t, 6,2> q62

A 6.2 integer (6 bits integer, 2 bits fraction)

Definition at line 47 of file qfx.h.

◆ q88

typedef qfx<uint16_t, 8,8> q88

A 8.8 integer (8 bits integer, 8 bits fraction)

Definition at line 49 of file qfx.h.

◆ saccum114

typedef int32_t saccum114

no direct ANSI counterpart. 1 bit int, 14 bits fraction

Definition at line 57 of file types.h.

◆ saccum1516

typedef int32_t saccum1516

ANSI: signed _Accum. 15 bits int, 16 bits fraction.

Definition at line 55 of file types.h.

◆ saccum78

typedef int16_t saccum78

ANSI: signed short _Accum. 7 bits int, 8 bits fraction.

Definition at line 53 of file types.h.

◆ sfract15

typedef int16_t sfract15

ANSI: signed _Fract.

Range is -0.99996948242 to 0.99996948242 in steps of 0.00003051757.
Should be interpreted as signed 32768ths.

Definition at line 49 of file types.h.

◆ sfract31

typedef int32_t sfract31

ANSI: signed long _Fract. 31 bits int, 1 bit fraction.

Definition at line 42 of file types.h.

◆ sfract7

typedef int8_t sfract7

ANSI: signed short _Fract.

Range is -0.9921875 to 0.9921875 in steps of 0.0078125.
Should be interpreted as signed 128ths.

Definition at line 35 of file types.h.