Macros


Detailed Description

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


Convertion macro from a float to a Q Formated value

Note:
These macros limit the number in its range


#define DSP16_Q(fnum)   ((dsp16_t__) DSP_Q(DSP16_QA, DSP16_QB, fnum))
 Convert a float into a 16-bit signed fixed-point type.
#define DSP32_Q(fnum)   ((dsp32_t__) DSP_Q(DSP32_QA, DSP32_QB, fnum))
 Convert a float into a 32-bit signed fixed-point type.
#define DSP_Q(a, b, fnum)
 Convert a float into a signed fixed-point typed Qa.b.

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.
#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.

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.

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.
#define DSP_Q_MIN(a, b)   ((S32) ((-1) << ((a)+(b)-1)))
 Return the minimal value of a fixed-point Qa.b typed number.


Define Documentation

#define DSP16_Q ( fnum   )     ((dsp16_t__) DSP_Q(DSP16_QA, DSP16_QB, fnum))

#define DSP32_Q ( fnum   )     ((dsp32_t__) DSP_Q(DSP32_QA, DSP32_QB, fnum))

#define DSP_FP_MAX ( a,
 )     (((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.

Definition at line 252 of file dsp_types.h.

#define DSP_FP_MIN ( a,
 )     (-((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.

Definition at line 256 of file dsp_types.h.

Referenced by gui_buffer_print_dsp16_bars(), and gui_buffer_print_dsp16_signal().

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

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

Definition at line 278 of file dsp_types.h.

#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.

Definition at line 288 of file dsp_types.h.

Referenced by dsp16_filt_lpfirdesign(), 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,
 )     ((S32) (((U32) -1) >> (32 - ((a)+(b)-1))))

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

Definition at line 265 of file dsp_types.h.

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,
 )     ((S32) ((-1) << ((a)+(b)-1)))


Generated on Fri Feb 19 02:23:23 2010 for AVR32 UC3 - EVK1104 DSPLib Demo Documentation by  doxygen 1.5.5