Texas Instruments C28 Series User Manual

Function Descriptions
Example:
The following sample code obtains the complex FFT of the input.
#include "FPU.h"
#define CFFT_STAGES 7
#define CFFT_SIZE (1 << CFFT_STAGES)
float CFFTin1Buff[CFFT_SIZE
*
2];
float CFFTin2Buff[CFFT_SIZE
*
2];
float CFFToutBuff[CFFT_SIZE
*
2];
float CFFTF32Coef[CFFT_SIZE];
CFFT_F32_STRUCT cfft;
main()
{
cfft.InPtr = CFFTin1Buff; /
*
Input data buffer
*
/
cfft.OutPtr = CFFToutBuff; /
*
FFT output buffer
*
/
cfft.CoefPtr = CFFTF32Coef; /
*
Twiddle factor buffer
*
/
cfft.FFTSize = CFFT_SIZE; /
*
FFT length
*
/
cfft.Stages = CFFT_STAGES; /
*
FFT Stages
*
/
... ...
CFFT_f32_sincostable(&cfft); /
*
Initialize twiddle
*
/
/
*
buffer
*
/
CFFT_f32u(&cfft); /
*
Calculate output
*
/
}
Benchmark Information:
The following table provides benchmark numbers for the function. Note that these include the
cycles used in the call/return from the function
FFTSize C-Callable ASM (Cycle Count)
32 1351
64 2785
128 5931
256 12821
512 27839
1024 60393
Table 3.5: Benchmark Information
Sep 10, 2012 16

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