Macros

This group regroups all the defined macros you can use in your project.

Limit values in floating-point format of a signed fixed-point number typed Qa.b
#define	DSP_FP_MAX(a, b)   (((float) (1 << ((a)-1))) - DSP_FP_RES(a, b))
	Return the maximal value of a fixed-point Qa.b typed number. The result is returned as a floating point number. More...
#define	DSP_FP_MIN(a, b)   (-((float) (1 << ((a)-1))))
	Return the minimal value of a fixed-point Qa.b typed number. The result is returned as a floating point number. More...

Limit values in fixed-point format of a signed fixed-point number typed Qa.b
#define	DSP_Q_MAX(a, b)   ((int32_t) (((uint32_t) -1) >> (32 - ((a)+(b)-1))))
	Return the maximal value of a fixed-point Qa.b typed number. More...
#define	DSP_Q_MIN(a, b)   ((int32_t) ((-1) << ((a)+(b)-1)))
	Return the minimal value of a fixed-point Qa.b typed number. More...

Resolution in floating-point format of a signed fixed-point number typed Qa.b
#define	DSP_FP_RES(a, b)   (1./((unsigned) (1 << (b))))
	Return the resolution of a fixed-point Qa.b typed number. More...

Conversion macro from a float to a Q Formated value
Note These macros limit the number in its range
#define	DSP_Q(a, b, fnum)
	Convert a float into a signed fixed-point typed Qa.b. More...
#define	DSP16_Q(fnum)   ((dsp16_t__) DSP_Q(DSP16_QA, DSP16_QB, fnum))
	Convert a float into a 16-bit signed fixed-point type. More...
#define	DSP32_Q(fnum)   ((dsp32_t__) DSP_Q(DSP32_QA, DSP32_QB, fnum))
	Convert a float into a 32-bit signed fixed-point type. More...

#define DSP16_Q

(

fnum

)

((dsp16_t__) DSP_Q(DSP16_QA, DSP16_QB, fnum))

Convert a float into a 16-bit signed fixed-point type.

Referenced by dsp16_gen_sqr(), dsp16_op_acos(), and dsp16_op_cos().

#define DSP32_Q

(

fnum

)

((dsp32_t__) DSP_Q(DSP32_QA, DSP32_QB, fnum))

Convert a float into a 32-bit signed fixed-point type.

Referenced by dsp32_gen_sqr(), dsp32_op_acos(), and dsp32_op_cos().

#define DSP_FP_MAX	(		a,
			b
	)		(((float) (1 << ((a)-1))) - DSP_FP_RES(a, b))

Return the maximal value of a fixed-point Qa.b typed number. The result is returned as a floating point number.

#define DSP_FP_MIN	(		a,
			b
	)		(-((float) (1 << ((a)-1))))

Return the minimal value of a fixed-point Qa.b typed number. The result is returned as a floating point number.

#define DSP_FP_RES	(		a,
			b
	)		(1./((unsigned) (1 << (b))))

Return the resolution of a fixed-point Qa.b typed number.

#define DSP_Q	(		a,
			b,
			fnum
	)

Value:

(((fnum) >= DSP_FP_MAX(a, b) - DSP_FP_RES(a, b))?\
                                  DSP_Q_MAX(a, b):\
                                  (((fnum) <= DSP_FP_MIN(a, b) + DSP_FP_RES(a, b))?\
                                  DSP_Q_MIN(a, b):\
                                  (((fnum)*(((unsigned) (1 << (b))))))))

Convert a float into a signed fixed-point typed Qa.b.

#define DSP_Q_MAX	(		a,
			b
	)		((int32_t) (((uint32_t) -1) >> (32 - ((a)+(b)-1))))

Return the maximal value of a fixed-point Qa.b typed number.

#define DSP_Q_MIN	(		a,
			b
	)		((int32_t) ((-1) << ((a)+(b)-1)))

Return the minimal value of a fixed-point Qa.b typed number.