Texas Instruments C28 Series User Manual

Function Descriptions
3.5 Complex Fast Fourier Transform Phase
Description:
This module computes FFT Phase.
Header File:
FPU.h
Declaration:
void CFFT_f32_phase (CFFT_F32_STRUCT
*
)
Usage:
A pointer to the following structure is passed to the CFFT_f32_phase function.It is the same
structure described in the CFFT_f32 section:
typedef struct {
float32
*
InPtr;
float32
*
OutPtr;
float32
*
CoefPtr;
float32
*
CurrentInPtr;
float32
*
CurrentOutPtr;
Uint16 Stages;
Uint16 FFTSize;
} CFFT_F32_STRUCT;
Table 3.2 describes each element.
Alignment Requirements:
The Phase buffer requires no alignment but the input buffer to the complex FFT routine will
need alignment if using the CFFT_f32().
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.
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Texas Instruments C28 Series Specifications

General

Architecture	32-bit
Core	TMS320C28x
Operating Voltage	3.3 V
Operating Temperature	-40°C to 125°C
ADC	12-bit
Communication Interfaces	CAN, SPI, I2C, SCI
Peripherals	Timers
Package	Various (e.g., LQFP, BGA)

Summary

Introduction to C28x FPU Library

C28x FPU Library Structure

Library Build Options

Details the compiler options used to build the FPU library.

FPU Library Header Files

Explains the purpose and content of the library's header files.

C Functions and IQMath Integration

Discusses the use of C functions and IQMath in the FPU library.

C28x FPU Library Function Descriptions

DSP Routines Overview

Covers Fast Fourier Transforms (FFT) and related functions for signal processing.

Vector and Matrix Operations

Provides functions for element-wise operations on complex and real vectors.

Core Math Functions

Includes fundamental math operations like square root.

Optimized Utility Functions

Offers optimized memory copy and set operations.

FPU Library Revision History

Important Notice and Disclaimers