User's Guide
SLAU295A – September 2009 – Revised October 2012
TLV320AIC3254EVM-U
This User’s Guide describes the operation, use, features and characteristics of the TLV320AIC3254EVMU. This small form factor evaluation module (EVM) is a programmable USB audio device that features the
TLV320AIC3254 Audio Codec with miniDSP.
Figure 1. TLV321AIC3254EVM-U Angle View
The following related documents are available through the Texas Instruments Web site at www.ti.com.
EVM-Compatible Device Data Sheets
Device
Literature Number
TLV320AIC3254
SLAS549
TAS1020B
SLES025
Contents
1
EVM Overview ............................................................................................................... 3
2
EVM Description and Basics .............................................................................................. 4
3
AIC3254EVM-U Control Software ........................................................................................ 7
Appendix A
TLV320AIC3254EVM Schematic ............................................................................... 15
Appendix B
TLV320AIC3254EVM Bill of Materials ......................................................................... 16
Appendix C Writing Scripts ..................................................................................................... 18
List of Figures
1
2
3
4
5
6
7
8
9
10
11
.....................................................................................
Bottom and Top Views .....................................................................................................
Default Input and Output Signals .........................................................................................
Sounds and Audio Devices Properties ...................................................................................
Main Panel Window ........................................................................................................
Compatibility Tab............................................................................................................
Playback Configurations and Controls ..................................................................................
Associated Script and Description ......................................................................................
Tip Strip Example..........................................................................................................
Status Flags Panel ........................................................................................................
Register Tables Panel ....................................................................................................
TLV321AIC3254EVM-U Angle View
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TLV320AIC3254EVM-U
1
4
5
6
8
9
10
10
11
12
13
1
www.ti.com
12
Command Line interface Panel .......................................................................................... 14
List of Tables
1
2
TLV320AIC3254EVM Bill of Materials .................................................................................. 16
TLV320AIC3254EVM-U
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EVM Overview
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1
EVM Overview
1.1
Features
•
•
•
•
Small USB Stick form factor EVM for the TLV320AIC3254 Audio Codec.
USB connection to the PC provides power, control and streaming audio for easy evaluation.
Pre-programmed EEPROM boots the TLV320AIC3254 as a fully functional USB Audio Device when
connected to a PC.
Easy to use AIC3254 Control Software (CS) configures and controls the TLV320AIC3254.
The TLV320AIC3254EVM-U is a universal serial bus (USB)-based audio device for use with a personal
computer running the Microsoft Windows™ XP operating system
1.2
Introduction
The TLV320AIC3254EVM-U is a USB Audio Device with programmable inputs and outputs, effects and
extensive routing capabilities. It is a simple platform to evaluate the TLV320AIC3254 miniDSP Audio
Codec.
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3
EVM Description and Basics
2
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EVM Description and Basics
This section provides information on the analog input and output, digital control, power, and general
connection of the TLV320AIC3254EVM-U.
2.1
TLV320AIC3254EVM-U Hardware Description
The TLV320AIC3254EVM-U has 2 stereo analog input connectors (Line-in and Mic-in) and 2 stereo
analog output connectors (Line-Out and Headphone-Out) that are routed to the TLV320AIC3254. Digital
audio as well as control data communicated between the PC and the EVM are interpreted by the
TAS1020B USB Streaming Controller. Control data is communicated to the TLV320AIC3254 via the I2C
protocol; audio data is communicated via the I2S protocol.
An on-board 32KB EEPROM is capable of storing TLV320AIC3254 commands (scripts) as well as the
TAS1020B firmware. A push button is provided to cycle between scripts along with an LED that provides
the user feedback regarding the script that is currently loaded. The EEPROM Manager in the AIC3254 CS
is used to write new scripts into the EEPROM.
Figure 2. Bottom and Top Views
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The table below summarizes the audio jacks available to connect analog inputs and outputs to the
TLV320AIC3254, as well as a switch.
Designator
Label
Associated Pin
Description
J1
L IN (LINE IN)
IN2_L / IN2_R
Line Input.
IN3_L / IN3_R
External electric
microphone input.
MICBIAS is connected to
both tip and ring through
resistors.
LOL / LOR
Line output. Only high
impedance loads should
be connected to this
output (e.g. external
Class-D amplifier).
J2
2.2
MIC IN (MIC IN)
J3
L OUT (LINE OUT)
J4
HP OUT (HEADPHONE) HPL / HPR
Headphone output.
SW1
SW1
Cycles through scripts
loaded in the on-board
EEPROM.
N/A
Getting Started
Evaluation can start right out of the box. Simply connect the TLV320AIC3254EVM-U to an available USB
port, connect stereo headphones to HP OUT and start playing audio with any media player. By default,
when the TLV320AIC3254EVM-U is connected, the TLV320AIC3254 is automatically configured to play
and record stereo audio through all four jacks, as shown below.
Figure 3. Default Input and Output Signals
To adjust playback volume, open “Sounds and Audio Devices” in the “Control Panel” and click the
“Volume” button of the “Sound playback” section of the “Audio” tab. Ensure USB-miniEVM is selected as
the default playback and recording device.
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EVM Description and Basics
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Figure 4. Sounds and Audio Devices Properties
Pressing SW1 on the EVM once will set a flat response at the outputs (LED D1 blinks once). Pressing
SW1 again will switch to bass and treble boost (LED D1 blinks twice).
The following section explains the software installation procedure which allows programming of the audio
device.
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AIC3254EVM-U Control Software
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3
AIC3254EVM-U Control Software
The AIC3254 Control Software (CS) is an intuitive, easy-to-use, powerful tool to learn, evaluate, and
control the TLV320AIC3254. This tool was specifically designed to make learning the TLV320AIC3254
software easy. The following sections describe the operation and installation of this software
NOTE: For configuration of the codec, the TLV320AIC3254 block diagram located in SLAS549 is a
good reference to help determine the signal routing.
3.1
AIC3254EVM-U CS Setup
This section provides setup instructions for the AIC3254EVM-U CS.
To install the AIC3254EVM-U software:
1. Download the latest version of the AIC3254EVM-U Control Software (CS) located in the
TLV320AIC3254EVM-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.
This installs all the AIC3254EVM-U software and required drivers onto the PC.
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AIC3254EVM-U Control Software
3.2
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AIC3254EVM-U CS Usage
The following sections describe the AIC3254EVM-U CS usage.
3.2.1
Main Panel Window
The Main Panel window, shown in the figure below,
provides easy access to all the features of the
AIC3254 CS.
The Firmware Name and Version boxes provide
information about the firmware loaded into the EVM's
EEPROM.
The USB-MODEVM Interface drop-down menu allows
the user to select which communication protocol the
TAS1020B USB Controller uses to communicate with
the TLV320AIC3254.
The TLV320AIC3254 supports I2C Standard, I2C Fast,
and 8-bit register SPI. However, this EVM only
supports I2C. 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 TLV320AIC3254.
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
TLV320AIC3254 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 5. Main Panel Window
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If running the software in Windows Vista or Windows 7, right-click the AIC3254EVM-U CS shortcut and select
Properties. Configure the Compatibility tab as shown in Figure 6
Figure 6. Compatibility Tab
3.2.2
Typical Configurations
This category can help users to quickly become familiar with the TLV320AIC3254. Each of the panels that
can be accessed through this menu have controls relevant to the selected configuration; a tab shows the
script that will be loaded for that particular configuration. Each script includes a brief description of the
selected configuration.
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Figure 7. Playback Configurations and Controls
Figure 8. 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 TLV320AIC3254 . 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 9
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 9. 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. Other controls must only be modified with a specific
hardware setup, such as powering up the AVDD LDO.
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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AIC3254EVM-U Control Software
3.2.4
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Status Flags Panel
The TLV320AIC3254 status flags can monitored in the Status Flags panel (Figure 10) which is located
below in 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 10. Status Flags Panel
12
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3.2.5
Register Tables Panel
The contents of configuration and coefficient pages of the TLV320AIC3254 can be accessed through the
Register Tables panel (Figure 11). 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 11. Register Tables Panel
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3.2.6
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Command-line Interface Panel
The Command-Line Interface panel provides a means to communicate with the TLV320AIC3254 using a
simple scripting language (described in Appendix C). The TAS1020B USB Controller handles all
communication between the PC and the TLV320AIC3254. 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 12). 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 (i.e., write, read) for a particular interface. The
Flag Retries box displays the number of read iterations performed by a Wait for Flag command (see
Appendix C 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 can then 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 12. Command Line interface Panel
14
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Appendix A TLV320AIC3254EVM Schematic
The schematic diagram for the TLV320AIC3254EVM is provided as a reference.
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TLV320AIC3254EVM Schematic
15
TLV320AIC3254_RHB_USB_EVM
SDA
SCL
LINE IN
C1
Shield
LEFT
RIGHT
SCLK
2
5
0.47ufd/16V
0603
6
C2
+3.3V
3
GND
0.47ufd/16V
0603
4
C3
1
J1
GND
GND
GND
MIC IN
R1
R2
1.2K
0603
1.2K
0603
Shield
RIGHT
5
6
C6
13
12
11
10
C4
9
8
10ufd/6.3V
0603
18
7
19
6
20
5
21
4
DIN
22
3
WCLK
23
2
BCLK
24
1
MCLK
3
0.47ufd/16V
0603
4
14
17
2
0.47ufd/16V
0603
15
C35
C5
LEFT
16
10ufd/6.3V
0603
25
1
26
27
28
29
30
31
0.1ufd/6.3V
0402
DOUT
U1
32
TLV320AIC3254RHB
J2
QFN32-RHB
GND
RESET~
LINE OUT
LEFT
R3
2
100
0603
Shield
5
RIGHT
6
R5
3
100
0603
4
C13
C14
1
.047ufd/25V
0603
.047ufd/25V
0603
J3
GND
C7
C8
+3.3V
R4
0.1ufd/6.3V
0402
1.0ufd/16V
0603
C9
4.7K
0603
C10
1.0ufd/16V
0603
22ufd/6.3V
0805
C11
C12
0.1ufd/6.3V
0402
0.1ufd/6.3V
0402
C15
C16
22ufd/6.3V
0805
10ufd/6.3V
0603
GND
GND
GND
GND
HEADPHONE
Shield
LEFT
RIGHT
GND
U1
TLV320AIC3254RHB
QFN32-RHB
GND 33
GND 34
GND 35
GND 36
GND 37
GND 38
GND 39
GND 40
GND 41
GND
+3.3V
C17
2
5
100ufd/6.3V
1210
6
C18
3
100ufd/6.3V
1210
4
1
J4
GND
TI
TLV320AIC3254_RHB_USB_EVM
PAGE INFO:
DESIGN LEAD
LEAD: STEVE LEGGIO
EDGE #
#:
6508852
JULY 09, 2009
DATE
DATE:
FILENAME
FILENAME:TLV320AIC3254_RHB_USB_EVM
SCH REV
REV: B
PCB REV
REV: B
SHEET
SHEET: 1 OF
OF:
DRAWN BY
BY: SL
4
TLV320AIC3254_RHB_USB_EVM
RESET~
SCLK
WCLK
DOUT
BCLK
DIN
MCLK
SDA
SCL
+3.3V
C19
EEPROM
U3
1
8
2
7
3
6
4
5
0.1ufd/6.3V
0402
GND
+3.3V
GND
R6
2.7K/5%
0603
MSOP8-DGK
GND
R7
2.7K/5%
0603
+3.3V
Y1
1
C22
2
1000pfd/50V
0603
+3.3V
GND
GND
R9
7
6
5
4
GND
1.50K
0603
Data+
NC
CASE DataCASE
46
45
44
43
42
41
40
39
38
37
36
2
35
3
34
4
33
U2
27.4
0603
1
0.1ufd/6.3V
0402
30
GND
29
9
28
10
27
11
26
12
25
+3.3V
TYPEA_SMT-RA
R11
+5V
C25
31
8
+5V
+3.3V
32
5
7
R10
2
47
1
6
3
J5
GND
0.1ufd/6.3V
0402
GND
NC
GND
48
C24
8
4
3
R8
30.9K
0603
100pfd/50V
0805
USB INPUT
Vcc
GND OUT
SMT-8002
6MHz/3.3V
GND
C23
OE
27.4
0603
C26
C27
C28
47pfd/50v
0603
47pfd/50v
0603
0.1ufd/6.3V
0402
13
14
15
16 17
18
19
20
21 22
23
GND
POWER SUPPLY
GND
+5.0V USB INPUT
+3.3V OUTPUT
24
VR1
+5V
+3.3V
D1
GND
GND
GND
Yellow
0805
GND
1
+3.3V
GND
R14
10K
0603
+3.3V
R12
100K
0603
+3.3V
C30
1.0ufd/16V
0603
C29
0.1ufd/6.3V
0402
R13
0.1ufd/50V
0603
649
0603
TLV320AIC3254_RHB_USB_EVM
PAGE INFO:
DESIGN LEAD
LEAD: STEVE LEGGIO
3
SW1
2
GND
4
+5V
C32
C33
10ufd/16V
0805
0.1ufd/50V
0603
C34
10ufd/16V
0805
GND
GND
TI
C31
5
2
GPIO
1
+3.3V
3.3V/400mA
SOT230DBV5
EDGE #
#: 6508852
GND
GND
GND
JULY 09, 2009
DATE:
DATE
FILENAME:
FILENAMETLV320AIC3254_RHB_USB_EVM
GND
GND
SCH REV
REV: B
PCB REV
REV: B
SHEET: 2 OF
SHEET
OF:
DRAWN BY
BY: SL
4
www.ti.com
Appendix B TLV320AIC3254EVM Bill of Materials
The complete bill of materials for the TLV320AIC3254EVM is provided as a reference.
Table 1. TLV320AIC3254EVM Bill of Materials
PCB
Qty Value
Ref Des
Description
Vendor
Part number
1
U1
ULTRA LO PWR ST AUDIO CODEC
W/EMBEDDED MINI DSP QFN32RHB ROHS
Texas
Instruments
TLV320AIC3254
RHB
Qty Value
Ref Des
Description
Vendor
Part number
1
1.5k
R9
RESISTOR SMD0603 1.50K OHM
1% THICK FILM 1/10W ROHS
DIGI-KEY
P1.50KHCT
3
100k
R3,R5,R12
RESISTOR SMD0603 100K OHM 1% DIGI-KEY
THICK FILM 1/10W ROHS
P100KHCT
1
1.7k
R4
RESISTOR SMD0603 4.7K OHMS
1% 1/10W ROHS
DIGI-KEY
P4.7KGCT
1
10k
R14
RESISTOR SMD0603 10K 5% 1/10W DIGI-KEY
ROHS
P10KGCT
2
1.2k
R1,R2
RESISTOR SMD0603 1.2K OHMS
5% 1/10W ROHS
DIGI-KEY
P1.2KGCT
1
649
R13
RESISTOR SMD0603 THICK FILM
649 OHMS 1% 1/10W ROHS
DIGI-KEY
311-649HRCT
1
30.9k
R8
RESISTOR SMD0603 30.9K OHMS
1% 1/10W ROHS
2
27.4k
R10,R11
RESISTOR SMD0603 27.4 OHMS
1% 1/10W ROHS
DIGI-KEY
P27.4HCT
2
2.7k
R6,R7
RESISTOR SMD0603 2.7K OHMS
5% 1/10W ROHS
DIGI-KEY
P2.7KGCT
2
100
R3,R5
RESISTOR SMD0603 100 OHM
1/10W 1% ROHS
DIGI-KEY
541-100HCT
Qty Value
Ref Des
Description
Vendor
Part number
9
0.1µF
C4,C7,C11,C12,C19,C24,C25,C28,C29
CAP SMD0402 CERM 0.1UFD 6.3V
10% X5R ROHS
DIGI-KEY
445-1266-1
3
10µF
C3,C16, C35
CAP SMD0603 CERM 10UFD 6.3V
20% X5R ROHS
DIGI-KEY
PCC2395CT
2
22µF
C10,C15
CAP SMD0805 CERM 22UFD 6.3V
20% X5R ROHS
DIGI-KEY
445-1422-1
2
47pF
C26,C27
CAP SMD0603 CERM 47PFD 50V
5% NPO ROHS
DIGI-KEY
PCC470ACVCT
1
1000pF
C22
CAP SMD0603 CERM 1000PFD 50V DIGI-KEY
5% COG ROHS
445-1293-1
1
1µF
C30
CAP SMD0603 CERM 1.0UFD 16V
5% X7R ROHS
DIGI-KEY
445-1604-1
4
0.47µF
C1,C2,C5,C6
CAP SMD0603 CERM 0.47UFD 16V
10% X5R ROHS
DIGI-KEY
478-1248-1
2
0.47µF
C13,C14
CAP SMD0603 CERM 0.47UFD 25V
10% X7R ROHS
DIGI-KEY
PCC1771CT
2
1µF
C8,C9
CAP SMD0603 CERM 1.0UFD 16V
10% X5R ROHS
DIGI-KEY
PCC2224CT
1
100pF
C23
CAP SMD0805 CERM 100PFD 50V
5% C0G ROHS
DIGI-KEY
490-1615-1
2
0.1µF
C31,C33
CAP SMD0603 CERM 0.1UFD 50V
10% X7R ROHS
DIGI-KEY
445-1314-1
RESISTORS
541-30.9KHCT
CAPACITORS
16
TLV320AIC3254EVM Bill of Materials
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Appendix B
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Table 1. TLV320AIC3254EVM Bill of Materials (continued)
2
10µF
C32,C34
CAP SMD0805 CERM 10UFD 16V
10% X5R ROHS
DIGI-KEY
490-3886-1
2
100µF
C17,C18
CAP SMD1210 CERM 100UFD 6.3V
20% X5R ROHS
DIGI-KEY
490-3390-1
INTEGRATED CIRCUITS
Qty Value
Ref Des
Description
Vendor
Part number
1
U2
USB STREAMING CONTROLLER
TQFP48-PFB ROHS
DIGI-KEY
296-13041-5
1
VR1
VOLT REG 3.3V 400MA LDO CAPFREE NMOS SOT23-DBV5 ROHS
DIGI-KEY
296-15819-1
1
U3
256K I2C SERIAL EEPROM,MSOP-8 DIGI-KEY
24AA256-I/MSND
1
D1
LED, YELLOW 2.0V SMD0805
ROHS
67-1554-1
1
Y1
OSCILLATOR SMT 6MHz 3.3V OUT- DIGI-KEY
ENABLE ROHS
7888002AI133E6.0T
DIGI-KEY
MISCELLANEOUS ITEMS
Qty Value
Ref Des
Description
Vendor
Part number
1
J5
JACK-USB MALE TYPEA SMT-RA
4PIN ROHS J
DIGI-KEY
WM17118
4
J1,J2,J3,J4
ACK AUDIO MINI(3.5MM ,4-COND
PCB-RA ROHS
DIGI-KEY
CP-43516SJCT
1
SW1
SWITCH, MOM, 160G SMT 4X3MM
ROHS
DIGI-KEY
EG4344CT
ATTENTION: All components must be Rhos compliant. Some part numbers may be either leaded or Rhos. Verify that purchased
components are Rhos compliant.
SLAU295A – September 2009 – Revised October 2012
Submit Documentation Feedback
TLV320AIC3254EVM Bill of Materials
Copyright © 2009–2012, Texas Instruments Incorporated
17
www.ti.com
Appendix C 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:
I
r
w
>
#
b
d
f
Set interface bus to use
Read from the serial control bus
Write to the serial control bus
Extend repeated write commands to lines below a w
Comment
Break
Delay
Wait 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
i2cfast
spi8
spi16
Standard mode I2C bus
Fast mode I2C bus
SPI bus with 8-bit register addressing
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 b command 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.
Anything following a comment command # is ignored by the parser, provided that it is on the same line.
The delay command d allows the user to specify a time, in milliseconds, that the script pauses before
proceeding. 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 usednote 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).
18
Writing Scripts
SLAU295A – September 2009 – Revised October 2012
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Copyright © 2009–2012, Texas Instruments Incorporated
Appendix C
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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:
#example script
I i2cfast
w 30 03 AA 55
r 30 03 02
This script begins with a comment, specifies that a fast I2C bus will be 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 06
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 buffers
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 is then displayed
in the command buffer. The user can also edit the script once it is in the buffer and save it by selecting
Save Script File... from the File menu.
SLAU295A – September 2009 – Revised October 2012
Submit Documentation Feedback
Copyright © 2009–2012, Texas Instruments Incorporated
Writing Scripts
19
Appendix C
www.ti.com
Once the script is in the command buffer, it can be executed by pressing the Execute Command Buffer
button. If there are breakpoints 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, push that
button and the script continues.
20
Writing Scripts
SLAU295A – September 2009 – Revised October 2012
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Copyright © 2009–2012, Texas Instruments Incorporated
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