Texas Instruments TMS320C64x DSP Manuel utilisateur

TMS320C64x+ DSP

Little-Endian DSP Library

Programmer’s Reference

Literature Number: SPRUEB8

February 2006

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iRead This First

Preface

Read This First

About This Manual

This document describes the C64x+ digital signal processor little-endian

(DSP) Library, or DSPLIB for short.

Notational Conventions

This document uses the following conventions:

-Hexadecimal numbers are shown with the suffix h. For example, the

following number is 40 hexadecimal (decimal 64): 40h.

-Registers in this document are shown in figures and described in tables.

-Macro names are written in uppercase text; function names are written in

lowercase.

JEach register figure shows a rectangle divded into fields that repre-

sent the fields of the register. Each field is labeled with its bit name, its

beginning and ending bit numbers above, and its read/write properties

below. A legend explains the notation used for the properties.

JReserved bits in a register figure designate a bit that is used for future

device expansion.

Related Documentation From Texas Instruments

The following books describe the C6000™devices and related support tools.

Copies of these documents are available on the Internet at www.ti.com. Tip:

Enter the literature number in the search box provided at www.ti.com.

SPRU732 — TMS320C64x/C64x+ DSP CPU and Instruction Set

Reference Guide. Describesthe CPU architecture, pipeline, instruction

set, and interrupts for the TMS320C64x and TMS320C64x+ digital

signal processors (DSPs) of the TMS320C6000 DSP family. The

C64x/C64x+ DSP generation comprises fixed-point devices in the

C6000 DSP platform. The C64x+ DSP is an enhancement of the C64x

DSP with added functionality and an expanded instruction set.

Trademarks

SPRAA84 — TMS320C64x to TMS320C64+ CPU Migration Guide.

Describes migrating from the Texas Instruments TMS320C64x digital

signal processor (DSP) to the TMS320C64x+ DSP. The objective of this

document is to indicate differences between the two cores. Functionality

in the devices that is identical is not included.

Trademarks

C6000, TMS320C64x+, TMS320C64x, C64x are trademarks of Texas

Instruments.

Contents

iii

Contents

1 Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Provides a brief introduction to the TI C64x+ DSPLIBs, shows the organization of the routines

contained in the libraries, and lists the features and benefits of the DSPLIBs.

1.1 Introduction to the TI C64x+ DSPLIB 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Features and Benefits 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Installing and Using DSPLIB 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Provides information on how to install and rebuild the TI C64x+ DSPLIB.

2.1 How to Install DSPLIB 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Using DSPLIB 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2.1 DSPLIB Arguments and Data Types 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2.2 Calling a DSPLIB Function From C 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2.3 Calling a DSP Function From Assembly 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2.4 DSPLIB Testing − Allowable Error 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2.5 DSPLIB Overflow and Scaling Issues 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2.6 Interrupt Behavior of DSPLIB Functions 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3 How to Rebuild DSPLIB 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 DSPLIB Function Tables 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Provides tables containing all DSPLIB functions, a brief description of each, and a page refer-

ence for more detailed information.

3.1 Arguments and Conventions Used 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2 DSPLIB Functions 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.3 DSPLIB Function Tables 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.4 Differences Between the C64x and C64x+ DSPLIBs 3-8. . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 DSPLIB Reference 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Provides a list of the functions within the DSPLIB organized into functional categories.

4.1 Adaptive Filtering 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.2 Correlation 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.3 FFT 4-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.4 Filtering and Convolution 4-38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.5 Math 4-58. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.6 Matrix 4-73. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.7 Miscellaneous 4-76. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.8 Obsolete Functions 4-90. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.8.1 FFT 4-90. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents

A Performance/Fractional Q Formats A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Describes performance considerations related to the C64x+ DSPLIB and provides information

about the Q format used by DSPLIB functions.

A.1 Performance Considerations A-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A.2 Fractional Q Formats A-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A.2.1 Q3.12 Format A-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A.2.2 Q.15 Format A-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A.2.3 Q.31 Format A-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

B Software Updates and Customer Support B-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Provides information about warranty issues, software updates, and customer support.

B.1 DSPLIB Software Updates B-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

B.2 DSPLIB Customer Support B-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

C Glossary C-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Defines terms and abbreviations used in this book.

Tables

vContents

Tables

2−1 DSPLIB Data Types 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3−1 Argument Conventions 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3−2 Adaptive Filtering 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3−3 Correlation 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3−4 FFT 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3−5 Filtering and Convolution 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3−6 Math 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3−7 Matrix 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3−8 Miscellaneous 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3−9 Obsolete Functions 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3−10 Functions Optimized in the C64x+ DSPLIB 3-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A−1 Q3.12 Bit Fields A-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A−2 Q.15 Bit Fields A-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A−3 Q.31 Low Memory Location Bit Fields A-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A−4 Q.31 High Memory Location Bit Fields A-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1

Introduction

This chapter provides a brief introduction to the TI C64x+ DSP Libraries

(DSPLIB), shows the organization of the routines contained in the library, and

lists the features and benefits of the DSPLIB.

Topic Page

1.1 Introduction to the TI C64x+ DSPLIB 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Features and Benefits 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter 1

Introduction to the TI C64x+ DSPLIB

1-2

1.1 Introduction to the TI C64x+ DSPLIB

The TI C64x+ DSPLIB is an optimized DSP Function Library for C

programmers using devices that include the C64x+ megamodule. It includes

many C-callable, assembly-optimized, general-purpose signal-processing

routines. These routines are typically used in computationally intensive

real-time applications where optimal execution speed is critical. By using

these routines, you can achieve execution speeds considerably faster than

equivalent code written in standard ANSI C language. In addition, by providing

ready-to-use DSP functions, TI DSPLIB can significantly shorten your DSP

application development time.

The TI DSPLIB includes commonly used DSP routines. Source code is

provided that allows you to modify functions to match your specific needs.

The routines contained in the library are organized into the following seven

different functional categories:

-Adaptive filtering

JDSP_firlms2

-Correlation

JDSP_autocor

JDSP_autocor_rA8

-FFT

JDSP_fft16x16

JDSP_fft16x16_imre

JDSP_fft16x16r

JDSP_fft16x32

JDSP_fft32x32

JDSP_fft32x32s

JDSP_ifft16x16

JDSP_ifft16x16_imre

JDSP_ifft16x32

JDSP_ifft32x32

JDSP_fft16x16t (obolete, use DSP_fft16x16)

JDSP_bitrev_cplx (obsolete, use DSP_fft16x16)

JDSP_radix 2 (obsolete, use DSP_fft16x16)

JDSP_r4fft (obsolete, use DSP_fft16x16)

JDSP_fft (obsolete, use DSP_fft16x16)

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