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)   ((S32) (((U32) -1) >> (32 - ((a)+(b)-1))))
	Return the maximal value of a fixed-point Qa.b typed number. More...
#define	DSP_Q_MIN(a, b)   ((S32) ((-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...

Convertion 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_filt_lpfirdesign(), dsp16_filt_lpfirdesign_windowed_sinc(), dsp16_gen_dcomb(), dsp16_gen_dirac(), dsp16_gen_noise(), dsp16_gen_ramp(), dsp16_gen_rect(), dsp16_gen_saw(), dsp16_gen_sqr(), dsp16_op_acos(), dsp16_op_asin(), dsp16_op_cos(), dsp16_op_exp(), dsp16_op_kaiser_i0(), dsp16_op_kernel_cosfix(), dsp16_op_kernel_sinfix(), dsp16_op_ln_raw(), dsp16_op_pow(), dsp16_op_sin(), dsp16_op_sqrt(), dsp16_win_bart(), dsp16_win_black(), dsp16_win_gauss(), dsp16_win_hamm(), dsp16_win_hann(), dsp16_win_kaiser(), and dsp16_win_welch().

#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_dcomb(), dsp32_gen_dirac(), dsp32_gen_noise(), dsp32_gen_ramp(), dsp32_gen_rect(), dsp32_gen_saw(), dsp32_gen_sqr(), dsp32_op_acos(), dsp32_op_asin(), dsp32_op_cos(), dsp32_op_exp(), dsp32_op_kaiser_i0(), dsp32_op_kernel_cosfix(), dsp32_op_kernel_sinfix(), dsp32_op_ln_raw(), dsp32_op_pow(), dsp32_op_sin(), dsp32_op_sqrt(), dsp32_win_bart(), dsp32_win_black(), dsp32_win_gauss(), dsp32_win_hamm(), dsp32_win_hann(), dsp32_win_kaiser(), and dsp32_win_welch().

#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.

Referenced by dsp16_filt_lpfirdesign(), dsp16_filt_lpfirdesign_windowed_sinc(), dsp16_op_exp(), dsp16_op_kaiser_i0(), dsp16_op_log10(), dsp16_op_log2(), dsp16_op_pow(), dsp16_win_gauss(), and dsp16_win_kaiser().

#define DSP_Q_MAX	(		a,
			b
	)		((S32) (((U32) -1) >> (32 - ((a)+(b)-1))))

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

Referenced by dsp16_op_exp(), dsp16_op_pow(), dsp16_vect_min(), dsp32_op_exp(), dsp32_op_pow(), dsp32_vect_min(), and dsp_debug_read_q().

#define DSP_Q_MIN	(		a,
			b
	)		((S32) ((-1) << ((a)+(b)-1)))

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

Referenced by dsp16_op_ln(), dsp16_op_ln_raw(), dsp16_op_log10(), dsp16_op_log2(), dsp16_op_pow(), dsp16_vect_max(), dsp32_op_ln(), dsp32_op_ln_raw(), dsp32_op_log10(), dsp32_op_log2(), dsp32_op_pow(), dsp32_vect_max(), and dsp_debug_read_q().