Function Descriptions
3.14 Real Fast Fourier Transform Phase
Description:
This module computes FFT Phase.
Header File:
FPU.h
Declaration:
void RFFT_f32_phase (RFFT_F32_STRUCT
*
)
Usage:
A pointer to the following structure is passed to the RFFT_f32_phase function. It is the same
structure described in the RFFT_f32 section:
typedef struct {
float32
*
InBuf;
float32
*
OutBuf;
float32
*
CosSinBuf;
float32
*
MagBuf;
float32
*
PhaseBuf;
Uint16 FFTSize;
Uint16 FFTStages;
} RFFT_F32_STRUCT;
Table 3.11 describes each element.
Alignment Requirements:
None
Notes:
1. All buffers and stack are placed in internal memory (zero-wait states in data space).
2. The phase function calls the atan2 function in the runtime-support library. The
phase function has not been optimized at this time.
3. The use of the atan2 function in the FPUfastRTS library will speed up this routine.
The example for the CFFT has an alternate build configuration (Debug_FASTRTS)
where the rts2800_fpu32_fast_supplement.lib is used in place of the standard run-
time library rts2800_fpu32.lib.
Sep 10, 2012 42
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