Texas Instruments C28 Series User Manual

Function Descriptions
Example:
The following sample code obtains the FFT phase.
#include "FPU.h"
#define RFFT_STAGES 8
#define RFFT_SIZE (1 << RFFT_STAGES)
/
*
RFFTin1Buff section to 2
*
FFT_SIZE in the linker file
*
/
#pragma DATA_SECTION(RFFTin1Buff,"RFFTdata1");
float32 RFFTin1Buff[RFFT_SIZE];
#pragma DATA_SECTION(RFFToutBuff,"RFFTdata2");
float32 RFFToutBuff[RFFT_SIZE];
#pragma DATA_SECTION(RFFTmagBuff,"RFFTdata3");
float32 RFFTmagBuff[RFFT_SIZE/2+1];
#pragma DATA_SECTION(RFFTF32Coef,"RFFTdata4");
float32 RFFTF32Coef[RFFT_SIZE];
RFFT_F32_STRUCT rfft;
main()
{
rfft.FFTSize = RFFT_SIZE;
rfft.FFTStages = RFFT_STAGES;
rfft.InBuf = &RFFTin1Buff[0]; /
*
Input buffer
*
/
rfft.OutBuf = &RFFToutBuff[0]; /
*
Output buffer
*
/
rfft.CosSinBuf = &RFFTF32Coef[0]; /
*
Twiddle factor buffer
*
/
rfft.MagBuf = &RFFTmagBuff[0]; /
*
Magnitude buffer
*
/
RFFT_f32_sincostable(&rfft); /
*
Calculate twiddle factor
*
/
RFFT_f32(&rfft); /
*
Calculate output
*
/
}
Benchmark Information:
The RFFT_f32_sincostable function is written in C and not optimized.
Sep 10, 2012 45

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