Texas Instruments TLV320AIC23EVM



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    

June 2001 Digital Audio Products

User’s Guide

SLEU003

IMPORTANT NOTICE

Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue

any product or service without notice, and advise customers to obtain the latest version of relevant information

to verify, before placing orders, that information being relied on is current and complete. All products are sold

subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those

pertaining to warranty, patent infringement, and limitation of liability.

TI warrants performance of its products to the specifications applicable at the time of sale in accordance with

TI’s standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary

to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except

those mandated by government requirements.

Customers are responsible for their applications using TI components.

In order to minimize risks associated with the customer’s applications, adequate design and operating

safeguards must be provided by the customer to minimize inherent or procedural hazards.

TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent

that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other

intellectual property right of TI covering or relating to any combination, machine, or process in which such

products or services might be or are used. TI’s publication of information regarding any third party’s products

or services does not constitute TI’s approval, license, warranty or endorsement thereof.

Reproduction of information in TI data books or data sheets is permissible only if reproduction is without

alteration and is accompanied by all associated warranties, conditions, limitations and notices. Representation

or reproduction of this information with alteration voids all warranties provided for an associated TI product or

service, is an unfair and deceptive business practice, and TI is not responsible nor liable for any such use.

Resale of TI’s products or services with

statements different from or beyond the parameters

stated by TI for

that product or service voids all express and any implied warranties for the associated TI product or service,

is an unfair and deceptive business practice, and TI is not responsible nor liable for any such use.

Also see: Standard Terms and Conditions of Sale for Semiconductor Products.

www.ti.com/sc/docs/stdterms.htm

Mailing Address:

Texas Instruments

Post Office Box 655303

Dallas, Texas 75265

Copyright  2001, Texas Instruments Incorporated

EVM IMPORTANT NOTICE

Texas Instruments (TI) provides the enclosed product(s) under the following conditions:

This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT

OR EVALUATION PURPOSES ONLY and is not considered by TI to be fit for commercial use.

As such, the goods being provided may not be complete in terms of required design-,

marketing-, and/or manufacturing-related protective considerations, including product safety

measures typically found in the end product incorporating the goods. As a prototype, this

product does not fall within the scope of the European Union directive on electromagnetic

compatibility and therefore may not meet the technical requirements of the directive.

Should this evaluation kit not meet the specifications indicated in the EVM User’s Guide, the

kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING

WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER AND IS IN

LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY,

INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY

PARTICULAR PURPOSE.

The user assumes all responsibility and liability for proper and safe handling of the goods.

Further, the user indemnifies TI from all claims arising from the handling or use of the goods.

Please be aware that the products received may not be regulatory compliant or agency

certified (FCC, UL, CE, etc.). Due to the open construction of the product, it is the user’s

responsibility to take any and all appropriate precautions with regard to electrostatic

discharge.

EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY

SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR

CONSEQUENTIAL DAMAGES.

TI currently deals with a variety of customers for products, and therefore our arrangement with

the user is not exclusive.

TI assumes no liability for applications assistance, customer product design, software

performance, or infringement of patents or services described herein.

Please read the EVM User’s Guide and, specifically, the EVM Warnings and Restrictions

notice in the EVM User’s Guide prior to handling the product. This notice contains important

safety information about temperatures and voltages. For further safety concerns, please

contact the TI application engineer.

Persons handling the product must have electronics training and observe good laboratory

practice standards.

No license is granted under any patent right or other intellectual property right of TI covering

or relating to any machine, process, or combination in which such TI products or services

might be or are used.

Mailing Address:

Texas Instruments

Post Office Box 655303

Dallas, Texas 75265

Copyright  2001, Texas Instruments Incorporated

EVM WARNINGS AND RESTRICTIONS

It is important to operate this EVM within the specified input and output ranges described in

the EVM User’s Guide.

Exceeding the specified input range may cause unexpected operation and/or irreversible

damage to the EVM. If there are questions concerning the input range, please contact a TI

field representative prior to connecting the input power.

Applying loads outside of the specified output range may result in unintended operation and/or

possible permanent damage to the EVM. Please consult the EVM User’s Guide prior to

connecting any load to the EVM output. If there is uncertainty as to the load specification,

please contact a TI field representative.

During normal operation, some circuit components may have case temperatures greater than

60°C. The EVM is designed to operate properly with certain components above 60°C as long

as the input and output ranges are maintained. These components include but are not limited

to linear regulators, switching transistors, pass transistors, and current sense resistors. These

types of devices can be identified using the EVM schematic located in the EVM User’s Guide.

When placing measurement probes near these devices during operation, please be aware

that these devices may be very warm to the touch.

Mailing Address:

Texas Instruments

Post Office Box 655303

Dallas, Texas 75265

Copyright  2001, Texas Instruments Incorporated

Related Documentation From Texas Instruments

iii

Preface

Read This First

About This Manual

How to Use This Manual

This document contains the following chapters:

 Chapter 1—Introduction to the TLV320AIC23EVM Control Software

 Chapter 2—EVM Board Overview

 Chapter 3—Software Functional Overview

 Chapter 4—Host GUI Application

 Chapter 5—DSP Application

 Chapter 6—Host Software Development Support

Related Documentation From Texas Instruments

A number of reference sources were used in the development of this

document. The documents used are listed below:

 TI document: TLV320AIC23, Stereo Audio CODEC, 8 to 96-kHz, With

Integrated Headphone Amplifier, June 2001, literature number SLWS106.

 TI document: TLV320DAC23, Stereo Audio D/A Converter, 8 to 96-kHz,

With Integrated Headphone Amplifier, June 2001, literature number

SLES001.

Trademarks

iv

This equipment is intended for use in a laboratory test environment only. It

generates, uses, and can radiate radio frequency energy and has not been

tested for compliance with the limits of computing devices pursuant to subpart

J of part 15 of FCC rules, which are designed to provide reasonable protection

against radio frequency interference. Operation of this equipment in other

environments may cause interference with radio communications, in which

case the user at his own expense will be required to take whatever measures

may be required to correct this interference.

Trademarks

Windows is a registered trademark of Microsoft Corporation. All other trade-

marks are the property of their respective owners.

Contents

v

Contents

1 Introduction to the TLV320AIC23EVM Control Software 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.1 Acronyms 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 EVM Board Overview 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1 Digital Interfaces 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Analog Interfaces 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3 Power Supply 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.4 Connectors and Jumpers 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.5 Configuration for DSP Connection With Supplied Software 2-4. . . . . . . . . . . . . . . . . . . . . . .

2.6 Configuration for USB Connection With USB Audio Support 2-5. . . . . . . . . . . . . . . . . . . . . .

3 Software Functional Overview 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1 Software Component Summary 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2 Host GUI Application 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.3 DSP Application 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.4 Host Software Development Support 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 Host GUI Application 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.1 Operation 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.1.1 Main Dialog 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.1.2 Digital Control Dialog 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.1.3 Analog Control Dialog 4-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.1.4 Registers Dialog 4-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.2 Implementation 4-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5 DSP Application 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.1 Operation 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.2 Implementation 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6 Host Software Development Support 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.1 User Mode API 6-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.1.1 Functional Overview 6-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.1.2 API Summary 6-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.1.3 API Detail 6-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.2 Board Drivers 6-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.2.1 Functional Overview 6-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.2.2 PPC Driver API 6-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents

vi

A BOMs, Board Layers, and Schematics A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A.1 TLV320AIC23EVM Bill of Materials A-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A.2 TLV320DAC23EVM Bill of Materials A-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A.3 Board Layers A-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A.3 TLV320AIC23EVM and TLV320DAC23EVM Schematics A-18. . . . . . . . . . . . . . . . . . . . . . . .

Figures

2–1 TLV320AIC23 EVM Board Diagram 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–1 TLV320AIC23 EVM Board Audio Connection Example 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–1 Main Dialog, Phones Volume Selected 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–2 Main Dialog, Line Volume Selected 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–3 Digital Control Dialog 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–4 Analog Control Dialog 4-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–5 Registers Dialog 4-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6–1 C54x DSK/EVM Host Software Development Block Diagram 6-2. . . . . . . . . . . . . . . . . . . . . . . .

A–1 Top Silkscreen A-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A–2 Bottom Silkscreen A-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A–3 Drill Drawing A-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A–4 Copper Layer 1 A-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A–5 Copper Layer 2 A-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A–6 Copper Layer 3 A-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A–7 Copper Layer 4 A-17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A–8 TLV320AIC23EVM and TLV320DAC23EVM Schematics A-18. . . . . . . . . . . . . . . . . . . . . . . . . .

Tables

5–1 DSP Application Command Parameters 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6–1 User Mode API Calls Used by the AIC23 Codec Tester EVM Software 6-3. . . . . . . . . . . . . . .

1-1

Introduction to the TLV320AIC23EVM

Control Software

This document covers the user software provided with the TLV320AIC23EVM

board based on the TI TLV320AIC23 (hereafter referred to as AIC23) or the

TLV320DAC23 (hereafter referred to as DAC23). Except where noted the

AIC23 applies to both the TLV320AIC23 and the TLV320DAC23. This

software is composed of host software for an Intel-based PC running Windows

9Xt, NT 4.0t, or 2000[1]t and target software for the C54x DSP. The

function, operation, and implementation of the software are described. A

description of the TLV320AIC23 EVM board’s connectors and jumpers is also

provided, along with instructions on how to configure the board for use with the

TLV320AIC23 EVM user software or as a stand-alone USB audio device.

The TLV320AIC23 EVM platform is useful for the TLV320AIC23 and the

TLV320DAC23 device evaluations. The provided software allows users to

exercise the various modes and features of the AIC23 codec and DAC23 audio

DAC. The provided software is not intended to be used as the starting point

for production applications.

Topic Page

1.1 Acronyms 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter 1

[1] The TLV320AIC23EVM user software was developed on Windows 2000 and tested on Windows 2000 Windows Me.

Acronyms

1-2

1.1 Acronyms

 ADC Analog-to-digital converter

 AIC Analog interface circuit

 API Application programming interface

 DAC Digital-to-analog converter

 DDK Driver development kit

 DLL Dynamic link library

 DSK DSP starter kit

 DSP Digital signal processor

 EVM Evaluation module

 GUI Graphical user interface

 HPI Host port interface

 JTAG Joint test action group

 OS Operating system

 PCI Peripheral component interconnect

 PPC Parallel port controller

 TBC Test bus controller

 TI Texas Instruments

 VxD Virtual device driver

2-1

EVM Board Overview

The TLV320AIC23 EVM is designed to facilitate evaluation of the performance

and functionality of the TLV320AIC23 codec and the TLV320DAC23 audio

DAC.

Topic Page

2.1 Digital Interfaces 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Analog Interfaces 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3 Power Supply 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.4 Connectors and Jumpers 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.5 Configuration for DSP Connection With Supplied Software 2-4. . . . . . .

2.6 Configuration for USB Connection With USB Audio Support 2-5. . . . .

Chapter 2

Digital Interfaces

2-2

2.1 Digital Interfaces

The TLV320AIC23 EVM has three digital interfaces:

- DSP interface: This interface is compatible with the daughter-card con-

nector of TI DSP DSKs. The supplied user software supports C54x DSPs

on DSK/EVM boards with a parallel port interface.

- USB interface: The TLV320AIC23 EVM features a TUSB3200 USB con-

troller. The firmware implements the USB audio device class, which

makes it possible to play back sound files (MP3, WAV) from a Windowst

PC. The supplied user software does not utilize the USB interface.

- SPDIF interface: An onboard SPDIF transceiver can be used to connect

the AIC23 or DAC23 to a coaxial SDIF source or preamplifier. The firm-

ware for this part is still in development. The supplied user software does

not utilize the SPDIF interface.

2.2 Analog Interfaces

The TLV320AIC23 EVM has the following analog interfaces:

- Microphone in (AIC23 only)

- Line in

- Headphone out

- Line out

2.3 Power Supply

There are three ways to power up the TLV320AIC23 EVM:

- Separate supplies: For highest performance, separate supplies for analog

and digital can be connected to the TLV320AIC23 EVM.

- 7-V dc input. The TLV320AIC23 EVM has one connector for a 7-V to 9-V

power supply such as a wall-plug adapter.

- DSP daughter-card connector. This option is convenient to evaluate the

functionality of the data converter if (small) signal degradation due to the

power supply from the DSP board is acceptable.

Connectors and Jumpers

2-3

EVM Board Overview

2.4 Connectors and Jumpers

Figure 2–1 shows the location of the TLV320AIC23 EVM connectors, jumpers,

LEDs, and reset button.

Figure 2–1.TLV320AIC23 EVM Board Diagram

J1

J3

J13

J12

J11

J14

J2

J7

J10

J15

J4

J9

J5

J6

J8

SW1

JU1

JU2

JU3

JU4

JU5

JU6

JU7

JU8

Connectors: LEDs:

J1,

J2:

DSP interface (McBSPs, power supply) D2: 3.3-V indicator

J3: 3.3-V digital power supply D3: 5-V indicator

J4: 3.3-V analog power supply D4: USB active

J5: Left line in

J6: Right line in Switch:

J7: Microphone in (AIC23 only) SW: Reset button

J8: Left line out

J9: Right line out

J10: Headphone out

J11: SPDIF in

J12: SPDIF out

J13: 7-V to 9-V dc power supply

J14: 5-V power supply

J15: USB connector

Jumpers:

JU1: Voltage regulators enable. Remove if external supplies on J4, J13, and J14 are used.

JU2: Connects digital and analog ground planes. Always keep the jumper inserted.

JU3: DSP interface select. Insert jumper for DSP interface.

JU4: SPDIF interface select. Insert jumper for SPDIF interface.

JU5: Left channel internal/external headphone amplifier select. Left position: external amplifier;

right position: internal amplifier.

JU6: Right channel internal/external headphone amplifier select. Left position: external amplifier;

right position: internal amplifier.

JU7: I

2

C/SPI select. Left position: SPI, use SPI for DSP interface; right position.: use I2C for USB and SPDIF.

JU8: Flash write protection. Insert jumper to write-protect the flash (holds USB firmware).

Configuration for DSP Connection With Supplied Software

2-4

Figure 2–2.TLV320AIC23 EVM Board Audio Connection Example

J1

J3

J13

J12

J11

J14

J2

J7

J10

J15

J4

J9

J5

J6

J8

SW1

JU1

JU2

JU3

JU4

JU5

JU6

JU7

JU8

MIC

Speaker Pair #1 (RCA)

Audio Source

Speaker Pair #2 or

Head Phones

(3.5mm/Mini Stereo)

Note: Use Powered

CD

DVD

PC

USB SOURCE

Speakers Only

2.5 Configuration for DSP Connection With Supplied Software

The TLV320AIC23 EVM is compatible with the daughter-card connectors on

many TI DSP EVMs and DSKs. The following example is based on a

TMS320VC5402 DSK from Texas Instruments.

The supplied user software supports C54x DSPs on DSK/EVM boards with a

parallel-port interface.

For jumper connections regarding left and right positions, it is assumed users

are holding the TLV320AIC23 EVM so they can read the TI logo.

In order to use the TLV320AIC23 EVM with the DSP DSK, the DSP interface

must be selected:

 JU1: In, enable voltage regulators

 JU2: In, connect analog and digital ground planes

 JU3: In, select DSP interface

 JU4: Out, do not select SPDIF interface

 JU5: Right position, select internal headphone amplifier

 JU6: Right position, select internal headphone amplifier

Configuration for USB Connection With USB Audio Support

2-5

EVM Board Overview

 JU7: Left position, select SPI control interface

 JU8: In, write-protect flash memory

Connect an analog audio signal source to the line inputs (J5 and J6) and a

headphone or speakers to the headphone connector (J10).

The DSP interface uses McBSP0 for the digital audio data and McBSP1 for the

control interface. The supplied user software uses the DSP format of the

AIC23/DAC23—FS + 32 bit data (16 bit left and 16 bit right channel) in master

mode for the digital audio interface. All the clock signals (BCLK, LRCIN,

LRCOUT) are generated by the data converter. McBSP1 is used in SPI mode.

2.6 Configuration for USB Connection With USB Audio Support

The TLV320AIC23 EVM is compatible with the daughter-card connectors on

many TI DSP EVMs and DSKs. The following example is based on a

TMS320VC5402 DSK from Texas Instruments.

The supplied AIC23 codec tester software does not use the USB interface. The

USB interface is used with the built-in USB audio class driver in Windows 98,

Windows 98 SE, and Windows 2000.

For jumper connections regarding left and right positions, it is assumed that

users are holding the TLV320AIC23 EVM so they can read the TI logo.

In order to use the TLV320AIC23 EVM with the DSP DSK, the DSP interface

must be selected:

 JU1: In, enables voltage regulators

 JU2: In, connects analog and digital ground planes

 JU3: Remove this jumper for USB mode.

 JU4: Out, do not select SPDIF interface.

 JU5: Right position, selects internal headphone amplifier

 JU6: Right position, selects internal headphone amplifier

 JU7: Right position, selects I

2

C control interface

 JU8: In, write-protects flash memory

Configuration for USB Connection With USB Audio Support

2-6

After selecting the DSP interface, follow these steps:

1) Connect the USB cable to a PC and to the TLV320AIC23 EVM USB con-

nector. Connect a headphone or speakers to the headphone connector

(J10). No external power is needed, power is supplied via the USB con-

nection.

2) If the PC is running Windows 98, Windows 98 SE, or Windows 2000, it

recognizes the USB connection immediately after it is made. When

clicking on the speaker icon, the volume control menu comes up. In the

lower left hand of the volume menu the words USB device appear. This

assures users that the PC recognizes the TLV320AIC23 EVM as a USB

audio device.

3) Load an audio player. The media player included with Windows may be

used. Another player is Winamp, which may be downloaded from

http://www.winamp.com/

4) Load a music source file (MP3 or WAV). A source for music from the inter-

net can be found at http://shoutcast.com/

. Play the selected music

source.

5) The music is heard from the attached headphones or speakers.

3-1

Software Functional Overview

This chapter describes the user software for the TLV320AIC23 EVM.

Topic Page

3.1 Software Component Summary 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2 Host GUI Application 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.3 DSP Application 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.4 Host Software Development Support 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter 3

Software Component Summary

3-2

3.1 Software Component Summary

The user software developed for the TLV320AIC23 EVM can be divided into

three main areas:

 Host GUI application

 DSP application

 Host software development support

The following paragraphs describe the components of each of these areas.

3.2 Host GUI Application

The host GUI application (aic23.exe) provides the user interface to control the

TLV320AIC23 EVM via the DSP application running on the C54x DSK/EVM.

When aic23.exe is executed, the menu bar will read

AIC23 Codec Tester

. The

host GUI application communicates with the DSP over the parallel port

interface.

The host GUI application supports both high-level user-friendly control of the

AIC23 and low-level register control of the AIC23. The main dialog controls

sample rate selection, playback (i.e., tone generation), playback and record

(i.e. loopback), and volume. Secondary dialogs are used to control the digital

and analog audio paths and to provide direct register access.

The host GUI application sends commands to the DSP application over the

C54x DSK/EVM parallel port interface. The DSP application modifies the

AIC23 state in response to the commands it receives.

3.3 DSP Application

The DSP application (aic23.out) runs on a C54x DSK/EVM. It initializes the

DSP and the DSK/EVM peripherals (McBSPs), it configures the AIC23, and

then it enters a command loop where it receives commands from the host GUI

application over the C54x DSK/EVM parallel port interface. Each command is

processed to completion and then it polls for the next command.

The supported commands are: RESET, TEST (host communication),

REG_WRITE, WRITE_ALL (e.g. registers), PLAY (a tone of specified

frequency), RECORD (AIC23 only) (e.g., playback and record), and STOP

(the current PLAY or RECORD (AIC23 only) command).

The PLAY and RECORD (AIC23 only) commands are DMA-driven via

callback routines that run continuously until a STOP command is received.

Host Software Development Support

3-3

Software Functional Overview

3.4 Host Software Development Support

The host software development support enables the host GUI application to

communicate with the DSP application running on the C54x DSK/EVM. This

support consists of an application-programming interface (API) DLL that

provides user-callable functions, and a set of drivers supporting access to the

hardware under Windows 9X, NT 4.0, or 2000.

The user-mode API is implemented in evmdsk54x.dll. This DLL provides a

common user-mode interface across all Win32 operating systems. The ring-3

DLL communicates with the driver that handles all the OS-specific details and

direct board accesses.

The hardware drivers are implemented in ppc54x.dll, dlportio.dll, and

dlportio.sys. These drivers handle the OS-specific details and provide a

consistent interface to the user-mode DLL. This arrangement allows host

applications to be executed on any Win32 platform without recompilation.

3-4

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Texas Instruments TLV320AIC23EVM - User guide

Texas Instruments TLV320AIC23EVM - User guide

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