Texas Instruments TLV320AIC3256EVM-U User manual

User's Guide
SLOU294B–July 2010–Revised October 2012
TLV320AIC3256EVM-U Evaluation Module
This user’s guide describes the operation, use, features, and characteristics of the TLV320AIC3256EVM-
U. This small form factor evaluation module (EVM) is a programmable USB audio device that features the
TLV320AIC3256 Audio Codec with miniDSP.
Contents
1 EVM Overview ............................................................................................................... 2
1.1 Features ............................................................................................................. 2
1.2 Introduction ......................................................................................................... 2
2 EVM Description and Getting Started .................................................................................... 2
2.1 TLV320AIC3256EVM-U Hardware Description ................................................................ 2
2.2 Getting Started ..................................................................................................... 3
3 AIC3256EVM-U Control Software ........................................................................................ 4
3.1 AIC3256EVM-U CS Setup ........................................................................................ 4
3.2 AIC3256EVM-U CS Usage ....................................................................................... 4
4 TLV320AIC3256EVM-U Schematic ..................................................................................... 12
5 TLV320AIC3256EVM-U Bill of Materials ............................................................................... 14
6 Default Jumper Positions ................................................................................................. 18
7 Writing Scripts .............................................................................................................. 19
8 Related Documentation ................................................................................................... 20
List of Figures
1 Audio Properties ............................................................................................................ 3
2 Main Panel Window ........................................................................................................ 5
3 Compatibility Tab............................................................................................................ 6
4 Playback Configurations and Controls ................................................................................... 7
5 Associated Script and Description........................................................................................ 7
6 Tip Strip Example........................................................................................................... 8
7 Status Flags Panel.......................................................................................................... 9
8 Register Tables Panel .................................................................................................... 10
9 Command Line Interface Panel.......................................................................................... 11
10 Schematic, Sheet 1 of 3 .................................................................................................. 12
11 Schematic, Sheet 2 of 3 .................................................................................................. 13
12 Schematic, Sheet 3 of 3 .................................................................................................. 14
List of Tables
1 Audio Jacks Available to Connect Analog Inputs and Outputs ....................................................... 2
2 Bill of Materials for TLV320AIC3256_RSB_USB_EVM_REVA...................................................... 15
3 TLV320AIC3256EVM-U Rev. A Default Jumper Positions .......................................................... 18
Windows is a trademark of Microsoft Corporation.
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EVM Overview www.ti.com
1 EVM Overview
1.1 Features
• Small form factor EVM for the TLV320AIC3256 Audio Codec
• USB connection to the PC provides power, control, and streaming audio for easy evaluation.
• Easy-to-use AIC3256 Control Software (CS) configures and controls the TLV320AIC3256.
The TLV320AIC3256EVM-U is compatible with Windows™ XP-based personal computers.
1.2 Introduction
The TLV320AIC3256EVM-U is a USB audio device with programmable inputs and outputs, effects, and
extensive routing capabilities. It is a simple platform to evaluate the TLV320AIC3256 miniDSP Audio
Codec.
2 EVM Description and Getting Started
2.1 TLV320AIC3256EVM-U Hardware Description
The TLV320AIC3256EVM-U has two stereo analog input connectors (Line-In and Mic-In) and two stereo
analog output connectors (Line-Out and Headphone-Out) that are routed to the TLV320AIC3256. Digital
audio as well as control data communicated between the personal computer (PC) and the EVM are
interpreted by the TAS1020B USB Streaming Controller. Control data is communicated to the
TLV320AIC3256 via the I2C or SPI protocols; audio data is communicated via the I2S protocol.
An onboard 64KB EEPROM is capable of storing TLV320AIC3256 commands (scripts) as well as the
TAS1020B firmware. Two pushbuttons are provided to cycle between scripts along with two LEDs that
provide the user feedback regarding the script that is currently loaded. The EEPROM Manager in the
AIC3256 CS is used to write new scripts into the EEPROM. Additional information can be found in the
EEPROM Manager.
Table 1 summarizes the audio jacks available to connect analog inputs and outputs to the
TLV320AIC3256 and the switches.
Table 1. Audio Jacks Available to Connect Analog Inputs and Outputs
Designator Label Associated pin Description
J1 USB INPUT N/A USB Mini-B jack
J2 LINE IN IN1_L/IN1_R Line input
J3 MIC IN IN3_L/IN3_R Electret microphone input. Both stereo and mono types are supported (two or
three conductor). 2.2-kΩpullup resistors to MICBIAS at both the tip and the ring.
J4 LINE OUT LOL/LOR Line output. Connect only high-impedance loads to this output (e.g., external
Class-D amplifier).
J5 HP OUT HPL/HPR Headphone output
SW1 SW2 N/A RESET switch
SW2 SW2 N/A Cycles through application scripts loaded in the onboard EEPROM
SW3 SW3 N/A Cycles through patch scripts loaded in the onboard EEPROM
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2.2 Getting Started
Evaluation can start right out of the box:
1. Download and install the AIC3256EVM-U CS from the EVM product folder.
2. Connect the TLV320AIC3256EVM-U to an available USB port.
3. Connect stereo headphones to HP OUT.
4. Open the AIC3256EVM-U CS, and select a typical configuration from the Playback menu.
5. Play audio with any media player.
To adjust playback volume, open Sounds and Audio Devices Properties (see following inset illustration) in
the Control Panel, and click the Volume button of the Sound playback section of the Audio tab. Ensure
that USB-miniEVM is selected as the default playback and recording device.
Figure 1. Audio Properties
The following section explains the software installation procedure which allows programming of the audio
device.
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3 AIC3256EVM-U Control Software
The AIC3256 Control Software (CS) is an intuitive, easy-to-use, powerful tool to learn, evaluate, and
control the TLV320AIC3256. This tool was specifically designed to make learning the TLV320AIC3256
software easy. The following sections describe the operation and installation of this software.
NOTE: For configuration of the codec, the TLV320AIC3256 block diagram located in the
TLV320AIC3256 data sheet is a good reference to help determine the signal routing.
3.1 AIC3256EVM-U CS Setup
This section provides setup instructions for the AIC3256EVM-U CS.
To install the TLV320AIC3256EVM-U software:
1. Download the latest version of the AIC3256EVM-U Control Software (CS) located in the
TLV320AIC3256EVM-U Product Folder.
2. Open the self-extracting installation file.
3. Extract the software to a known folder.
4. Install the EVM software by double-clicking the Setup executable, and follow the directions. The user
may be prompted to restart their computer.
3.2 AIC3256EVM-U CS Usage
The following sections describe the AIC3256EVM-U CS usage.
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3.2.1 Main Panel Window The Firmware Name and Version boxes provide
information about the firmware loaded into the EVM's
The Main Panel window, shown in Figure 2, provides EEPROM.
easy access to all the features of the AIC3256 CS. The USB Interface drop-down menu allows the user to
select which communication protocol the TAS1020B
USB Controller uses to communicate with the
TLV320AIC3256.
The TLV320AIC3256 supports I2C Standard, I2C Fast,
and 8-bit register SPI. The USB Interface selection is
global to all panels, including the Command-Line
Interface.
The Panel Selection Tree provides access to typical
configurations, features, and other panels that allow
the user to control the TLV320AIC3256.
The tree is divided into several categories which
contain items that pop up panels. A panel can be
opened by double-clicking any item inside a category
in the Panel Selection Tree.
Below the Panel Selection Tree are three buttons that
pop up the following:
• Status Flags – Allows the user to monitor the
TLV320AIC3256 status flags.
• Register Tables – A tool to monitor register pages.
• Command-Line Interface – A tool to
execute/generate scripts and monitor register
activity.
The USB LED indicates if the EVM is recognized by
the software and the ACTIVITY LED illuminates every
time a command request is sent.
The dialog box at the bottom of the Main Panel
provides feedback of the current status of the
software.
Figure 2. Main Panel Window
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If running the software in Windows Vista or Windows 7, right-click the AIC3256EVM-U CS shortcut and select
Properties. Configure the Compatibility tab as shown in Figure 3
Figure 3. Compatibility Tab
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3.2.2 Typical Configurations
This category can help users to quickly become familiar with the TLV320AIC3256. Each of the panels that
can be accessed through this menu have controls relevant to the selected configuration; a tab shows the
script that is loaded for that particular configuration. Each script includes a brief description of the selected
configuration.
Figure 4. Playback Configurations and Controls
Figure 5. Associated Script and Description
3.2.3 Control Categories
The Digital Settings, Analog Settings, and Signal Processing categories provide control of many registers
and other features of the TLV320AIC3256 . These categories are intended for the advanced user.
Hovering the mouse cursor on top of a control displays a tip strip that contains page, register, and bit
information. As an example, hovering on top of IN1_R of the Audio Inputs panel, as shown in Figure 6,
displays p1_r55_b7-6 which means that this control writes to Page 1/Register 55/Bits D7 to D6.
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Figure 6. Tip Strip Example
Before changing a control, see the data sheet to ensure that a particular control is compatible with the
current state of the codec. As an example, some controls in the Analog Setup panel must be modified in a
particular order as described in the data sheet.
All controls update their status with respect to the register contents in the following conditions:
• A panel is opened.
• The Execute Command Buffer button in the Command-Line Interface is pressed (if enabled).
• The Refresh button at the bottom right of a panel is pressed.
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3.2.4 Status Flags Panel
The TLV320AIC3256 status flags can be monitored in the Status Flags panel (Figure 7) which is located
below the Panel Selection Tree. Pressing the POLL button continuously reads all the registers relevant to
each flag and updates those flags accordingly. The rate at which the registers are read can be modified by
changing the value in the Polling Interval numeric control. Note that a smaller interval reduces
responsiveness of other controls, especially volume sliders, due to bandwidth limitations. By default, the
polling interval is 200 ms and can be set to a minimum of 20 ms. The Sticky Flags tab contains indicators
whose corresponding register contents clear every time a read is performed to that register. To read all
the sticky flags, click the Read Sticky Flags button.
Figure 7. Status Flags Panel
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3.2.5 Register Tables Panel
The contents of configuration and coefficient pages of the TLV320AIC3256 can be accessed through the
Register Tables panel (Figure 8). The Page Number control changes to the page to be displayed in the
register table. The register table contains page information such as the register name, reset value, current
value, and a bitmap of the current value. The contents of the selected page can be exported into a
spreadsheet by clicking the Dump to Spreadsheet button.
Figure 8. Register Tables Panel
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3.2.6 Command-Line Interface Panel
The Command-Line Interface panel provides a means to communicate with the TLV320AIC3256 using a
simple scripting language (described in Section 7). The TAS1020B USB Controller handles all
communication between the PC and the TLV320AIC3256. A script is loaded into the command buffer,
either by loading a script file using the File menu or by pasting text from the clipboard using the Ctrl-V key
combination (Figure 9). When the command buffer is executed, the return data packets which result from
each individual command are displayed in the Command History control. This control is an array (with a
maximum size of 100 elements) that contains information about each command as well as status. The
Interface box displays the interface used for a particular command in the Command History array. The
Command box displays the type of command executed (e.g., write, read) for a particular interface. The
Flag Retries box displays the number of read iterations performed by a Wait for Flag command (see
Section 7 for details). The Register Data array displays the register number and data bytes that
correspond to a particular command. The Information tab provides additional information related to the
Command History as well as additional settings. The Syntax and Examples tabs provide useful information
related to the scripting language.
The File menu provides some options for working with scripts. The first option, Open Script File..., loads a
command file script into the command buffer. This script then can be executed by pressing the Execute
Command Buffer button. The contents of the Command Buffer can be saved using the Save Script File...
option.
Both the Command Buffer and Command History can be cleared by clicking their corresponding Clear
buttons
Figure 9. Command Line Interface Panel
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4 TLV320AIC3256EVM-U Schematic
The schematic diagram for the TLV320AIC3256EVM-U is provided as a reference.
Figure 10. Schematic, Sheet 1 of 3
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Figure 11. Schematic, Sheet 2 of 3
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TLV320AIC3256EVM-U Bill of Materials www.ti.com
Figure 12. Schematic, Sheet 3 of 3
Empty para to force the bill of materials to a new landscape page
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www.ti.com TLV320AIC3256EVM-U Bill of Materials
Table 2. Bill of Materials for TLV320AIC3256_RSB_USB_EVM_REVA
TI-SEMICONDUCTORS
Item QTY REF DES Description Vendor Vendor Part NO. MANU MANU Part NO.
1 1 U4 POWER TUNED CODEC HEADPHONE AMPS TEXAS INSTRUMENTS TLV320AIC3256RSB TEXAS INSTRUMENTS TLV320AIC3256RSB
MINIDSP QFN40-RSB ROHS
2 1 U1 USB STREAMING CONTROLLER TQFP48-PFB DIGI-KEY 296-13041-5 TEXAS INSTRUMENTS TAS1020BPFB
ROHS
3 1 U3 SINGLE BUS BUFFER GATE WITH 3-STATE DIGI-KEY 296-11605-1 TEXAS INSTRUMENTS SN74LVC1G126DBVR
OUTPUT SOT23-DBV5 ROHS
4 1 U6 VOLT REG 1.8V 400MA LDO CAP FREE NMOS DIGI-KEY 296-15816-1 TEXAS INSTRUMENTS TPS73618DBVT
SOT23-DBV5 ROHS
5 1 U7 VOLT REG 3.3V 400MA LDO CAP FREE NMOS DIGI-KEY 296-15819-1 TEXAS INSTRUMENTS TPS73633DBVT
SOT23-DBV5 ROHS
6 1 U5 IC LVL-TRANSL I2C BUS REP,MSOP8- DIGI-KEY 296-24730-1 TEXAS INSTRUMENTS PCA9517DGKR
DGK,ROHS
SEMICONDUCTORS
Item QTY REF DES Description Vendor Vendor Part NO. MANU MANU Part NO.
7 1 U2 512K I2C SERIAL EEPROM SOIC8-SM ROHS DIGI-KEY 24FC512-I/SM MICROCHIP 24FC512-I/SM
8 2 D1,D2 LED, YELLOW 2.0V SMD0805 ROHS DIGI-KEY 67-1554-1 LUMEX OPTO SML-LXT0805YW-TR
9 1 Y1 OSCILLATOR SMT 6MHz 3.3V OUT-ENABLE MOUSER 788-8002AI133E-6.0T SITIME SIT8002AI-13-33E-6.00000T
ROHS
CAPACITORS
Item QTY REF DES Description Vendor Vendor Part NO. MANU MANU Part NO.
10 2 C4,C5 CAP SMD0603 CERM 47PFD 50V 5% NPO DIGI-KEY PCC470ACVCT PANASONIC ECJ-1VC1H470J
ROHS
11 1 C7 CAP SMD0603 CERM 1.0UFD 16V 5% X7R DIGI-KEY 445-1604-1 TDK C1608X7R1C105K
ROHS
12 8 C3,C6,C8,C9,C10, CAP SMD0402 CERM 0.1UFD 6.3V 10% X5R DIGI-KEY 445-1266-1 TDK CORP C1005X5R0J104K
C11,C31,C32 ROHS
13 5 C12,C13,C14,C35, CAP SMD0603 CERM 0.1UFD 50V 10% X7R DIGI-KEY 445-1314-1 TDK C1608X7R1H104K
C38 ROHS
14 6 C23,C24,C25,C26, CAP SMD0603 CERM 10UFD 6.3V 20% X5R DIGI-KEY PCC2395CT PANASONIC ECJ-1VB0J106M
C29,C30 ROHS
15 5 C15,C16,C17,C18, CAP SMD0603 CERM 0.47UFD 16V 10% X5R DIGI-KEY 478-1248-1 AVX 0603YD474KAT2A
C33 ROHS
16 2 C19,C20 CAP SMD0603 CERM 047UFD 25V 10% X7R DIGI-KEY PCC1771CT PANASONIC ECJ-1VB1E473K
ROHS
17 2 C21,C22 CAP SMD0603 CERM 1.0UFD 16V 10% X5R DIGI-KEY PCC2224CT PANASONIC ECJ-1VB1C105K
ROHS
18 4 C34,C36,C37,C39 CAP SMD0805 CERM 10UFD 16V 10% X5R DIGI-KEY 490-3886-1 MURATA GRM21BR61C106KE15L
ROHS
19 2 C27,C28 CAP SMD0603 CERM 2.2UFD 10V 10% X7R DIGI-KEY 490-4520-1 MURATA GRM188R71A225KE15D
ROHS
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Table 2. Bill of Materials for TLV320AIC3256_RSB_USB_EVM_REVA (continued)
20 1 C1 CAP SMD0603 CERM 1000PFD 50V 5% COG DIGI-KEY 445-1293-1 TDK CORP. C1608C0G1H102J
ROHS
21 1 C2 CAP SMD0805 CERM 100PFD 50V 5% C0G DIGI-KEY 490-1615-1 MURATA GRM2165C1H101JA01D
ROHS
RESISTORS
Item QTY REF DES Description Vendor Vendor Part NO. MANU MANU Part NO.
22 1 R2 RESISTOR SMD0603 1.50K OHM 1% THICK DIGI-KEY P1.50KHCT PANASONIC ERJ-3EKF1501V
FILM 1/10W ROHS
23 1 R5 RESISTOR SMD0603 100K OHM 1% THICK DIGI-KEY P100KHCT PANASONIC ERJ-3EKF1003V
FILM 1/10W ROHS
24 7 R10,R11,R12,R13, RESISTOR SMD0603 10K 5% 1/10W ROHS DIGI-KEY P10KGCT PANASONIC ERJ-3GEYJ103V
R18,R22,R24
25 2 R6,R7 RESISTOR SMD0603 THICK FILM 649 OHMS DIGI-KEY 311-649HRCT YAGEO RC0603FR-07649RL
1% 1/10W ROHS
26 2 R3,R4 RESISTOR SMD0603 27.4 OHMS 1% 1/10W DIGI-KEY P27.4HCT PANASONIC ERJ-3EKF27R4V
ROHS
27 4 R8,R9,R19,R20 RESISTOR SMD0603 2.7K OHMS 5% 1/10W DIGI-KEY P2.7KGCT PANASONIC ERJ-3GEYJ272V
ROHS
28 2 R16,R17 RESISTOR SMD0603 100 OHM 1/10W 1% DIGI-KEY 541-100HCT VISHAY CRCW0603100RFKEA
ROHS
29 1 R1 RESISTOR SMD0603 3.09K OHM 1% THICK DIGI-KEY P3.09KHCT PANASONIC ERJ-3EKF3091V
FILM 1/10W ROHS
30 1 R21 RESISTOR SMD0603 200K OHMS 5% 1/10W DIGI-KEY P200KGCT PANASONIC ERJ-3GEYJ204V
ROHS
31 3 R14,R15,R23 RESISTOR SMD0603 2.20K OHMS 1% THICK DIGI-KEY P2.20KHCT PANASONIC ERJ-3EKF2201V
FILM 1/10W ROHS
FERRITES, INDUCTORS, CHOKES, COILS AND TRANSFORMERS
Item QTY REF DES Description Vendor Vendor Part NO. MANU MANU Part NO.
32 6 FB1,FB2,FB3,FB4, FERRITE CHIP, 220 OHMS 2A 100MHZ SMD DIGI-KEY 445-1565-1 TDK MPZ1608S221A
FB5,FB6 0603 ROHS
HEADERS AND JACKS
Item QTY REF DES Description Vendor Vendor Part NO. MANU MANU Part NO.
33 7 W4,W5,W6,W7,W1 HEADER 2 PIN, PCB 2.0MM ROHS DIGI-KEY 2663S-02 NORCOMP 26630201RP2
0,W11,W12
34 5 W1,W2,W3,W8,W9 HEADER 3 PIN, PCB 2.0MM ROHS DIGI-KEY 2663S-03 NORCOMP 26630301RP2
35 2 P1,P2 PLUG SMD 2x50 FEMALE JMDSERIES 0.5MM DIGI-KEY 455-1880-1 JST 100P-JMDSS-G-1-TF(LF)(SN)
LS GOLD ROHS
36 1 J1 JACK USB MINIB SMT-RA 5PIN ROHS DIGI-KEY H2959CT HIROSE UX60-MB-5ST
37 4 J2,J3,J4,J5 JACK AUDIO MINI(3.5MM ,4-COND PCB-RA DIGI-KEY CP-43516SJCT CUI STACK SJ-43516-SMT
ROHS
SOCKETS, SOCKET PINS AND TERMINAL BLOCKS
Item QTY REF DES Description Vendor Vendor Part NO. MANU MANU Part NO.
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Table 2. Bill of Materials for TLV320AIC3256_RSB_USB_EVM_REVA (continued)
TESTPOINTS AND SWITCHES
ITEM QTY REF DESCRIPTION VENDOR VENDOR PART NUM MANU MANU PART NUM
DESIGNATORS
38 13 TP1,TP2,TP3,TP4, PC TESTPOINT, WHITE, ROHS DIGI-KEY 5002K KEYSTONE 5002
TP5,TP6,TP7,TP8, ELECTRONICS
TP9,TP10,TP11,TP
12,TP13
39 2 TP15,TP16 PC TESTPOINT, BLACK, ROHS DIGI-KEY 5001K KEYSTONE 5001
ELECTRONICS
40 3 SW1,SW2,SW3 SWITCH, MOM, 160G SMT 4X3MM ROHS DIGI-KEY EG4344CT E-SWITCH TL1015AF160QG
NON-INSULATED WIRE GROUND LOOPS
Item QTY REF DES Description Vendor Vendor Part NO. MANU MANU Part NO.
BEND THE WIRE LENGTHS INTO A 'U' SHAPE AND SOLDER TO THE BOARD. LEAVE A GAP OF AROUND 0.1 INCHES BETWEEN THE BOARD AND THE WIRE.
Bus Wire (18-22 Gauge) N/A N/A N/A N/A
SHUNTS
Item QTY REF DES Description Vendor Vendor Part NO. MANU MANU Part NO.
1001 AS NEEDED SHUNT, BLACK AU FLASH 2mmLS DIGI-KEY SP2-001E NORCOMP INC. 810-002-SP2L001
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6 Default Jumper Positions
Table 3. TLV320AIC3256EVM-U Rev. A Default Jumper Positions
Jumper Default Position Description
W1 1-2 Selects between SCL and /SS lines
W2 1-2 Selects between SDA and MOSI lines
W3 1-2 Sets SPI_SELECT pin level to ground or IOVDD level
W4 Inserted Reserved.
W5 Inserted Connects MICDET to J5.4
W6 Removed Reserved
W7 Inserted Provides a means to measure AVDD Current
W8 2-3 Provides a means to measure DRVDD_HP Current and selects between 3.3V/1.8V
W9 1-2 Selects between 3.3V/1.8V for IOVDD Current
W10 Inserted Provides a means to measure IOVDD Current
W11 Inserted Provides a means to measure DVDD Current
W12 Inserted Provides a means to measure DVDD_CP Current
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www.ti.com Writing Scripts
7 Writing Scripts
A script is simply a text file that contains data to send to the serial control buses.
Each line in a script file is one command. No provision is made for extending lines beyond one line, except
for the > command. A line is terminated by a carriage return.
The first character of a line is the command. Commands are:
ISet interface bus to use
rRead from the serial control bus
wWrite to the serial control bus
>Extend repeated write commands to lines below a w
#Comment
bBreak
dDelay
fWait for Flag
The first command, I, sets the interface to use for the commands to follow. This command must be
followed by one of the following parameters:
i2cstd Standard mode I2C bus
i2cfast Fast mode I2C bus
spi8 SPI bus with 8-bit register addressing
spi16 SPI bus with 16-bit register addressing
For example, if a fast mode I2C bus is to be used, the script begins with:
I i2cfast
A double-quoted string of characters following the bcommand can be added to provide information to the
user about each breakpoint. When the script is executed, the software's command handler halts as soon
as a breakpoint is detected and displays the string of characters within the double quotes.
The Wait for Flag command, f, reads a specified register and verifies if the bitmap provided with the
command matches the data being read. If the data does not match, the command handler retries for up to
200 times. This feature is useful when switching buffers in parts that support the adaptive filtering mode.
The command f syntax follows:
f [i2c address] [register] [D7][D6][D5][D4][D3][D2][D1][D0]
where 'i2c address' and 'register' are in hexadecimal format
and 'D7' through 'D0' are in binary format with values of 0,
1 or X for don't care.8
Anything following a comment command #is ignored by the parser, provided that it is on the same line.
The delay command dallows the user to specify a time, in milliseconds, that the script pauses before
proceeding. Note: The delay time is entered in decimal format.
A series of byte values follows either a read or write command. Each byte value is expressed in
hexadecimal, and each byte must be separated by a space. Commands are interpreted and sent to the
TAS1020B by the program.
The first byte following an r(read) or w(write) command is the I2C slave address of the device (if I2C is
used) or the first data byte to write. (If SPI is used, note that SPI interfaces are not standardized on
protocols, so the meaning of this byte varies with the device being addressed on the SPI bus.) The
second byte is the starting register address that data will be written to (again, with I2C; SPI varies.
Following these two bytes are data, if writing; if reading, the third byte value is the number of bytes to
read, (expressed in hexadecimal).
For example, to write the values 0xAA 0x55 to an I2C device with a slave address of 0x30, starting at a
register address of 0x03, the user writes:
19
SLOU294B–July 2010–Revised October 2012 TLV320AIC3256EVM-U Evaluation Module
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#example script
I i2cfast
w 30 03 AA 55
r 30 03 02e
This script begins with a comment, specifies that a fast I2C bus is used, then writes 0xAA 0x55 to the I2C
slave device at address 0x30, writing the values into registers 0x03 and 0x04. The script then reads back
two bytes from the same device starting at register address 0x03. Note that the slave device value does
not change. It is unnecessary to set the R/W bit for I2C devices in the script; the read or write commands
does that.
If extensive repeated write commands are sent and commenting is desired for a group of bytes, the >
command can be used to extend the bytes to other lines that follow. A usage example for the >command
follows:
#example script for '>' command
I i2cfast
# Write AA and BB to registers 3 and 4, respectively
w 30 03 AA BB
# Write CC, DD, EE and FF to registers 5, 6, 7 and 8, respectively
> CC DD EE FF
# Place a commented breakpoint
b "AA BB CC DD EE FF was written, starting at register 3"
# Read back all six registers, starting at register 3
r 30 03 06b
The following example demonstrates usage of the Wait for Flag command, f:
#example script for 'wait for flag' command
I i2cfast
# Switch to Page 44
w 30 00 2C
# Switch buffer
w 30 01 05
# Wait for bit D0 to clear. 'x' denotes a don't care.
f 30 01 xxxxxxx0
Any text editor can be used to write these scripts; jEdit is an editor that is highly recommended for general
usage. For more information, go to: http://www.jedit.org.
Once the script is written, it can be used in the command window by running the program, and then
selecting Open Script File... from the File menu. Locate the script and open it. The script then is displayed
in the command buffer. The user also can edit the script once it is in the buffer and save it by selecting
Save Script File... from the File menu.
Once the script is in the command buffer, it can be executed by pressing the Execute Command Buffer
button. If breakpoints are in the script, the script executes to that point, and the user is presented with a
dialog box with a button to press to continue executing the script. When ready to proceed, the user
pushes that button and the script continues.
8 Related Documentation
1. TLV320AIC3256EVM-U Software (SLOC213)
20 TLV320AIC3256EVM-U Evaluation Module SLOU294B–July 2010–Revised October 2012
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