Texas Instruments TSC2117EVM-K Manuale utente

User's GuideSLAU282 – April 2009

TSC2117EVM-K

This user’s guide describes the operation of the TSC2117EVM-K evaluation module (EVM). The EVMfeatures a TSC2117 touch screen controller with stereo audio codec, amplifiers for speakers andheadphones and a digital signal processing module. Together with the USB-MODEVM board, theTSC2117 Control Software and a PC running Windows™ XP it is a plug-and-play solution to evaluate thecapabilities of the TSC2117.

The information in a caution or a warning is provided for your protection. Read each caution and warningcarefully.

Contents1 EVM Overview ............................................................................................................... 21.1 Introduction .......................................................................................................... 21.2 Box Contents ........................................................................................................ 21.3 Related Documentation From Texas Instruments .............................................................. 22 EVM + PC .................................................................................................................... 32.1 EVM Preparation .................................................................................................... 32.2 Control Software .................................................................................................... 42.3 Installation ........................................................................................................... 42.4 Concepts ............................................................................................................. 42.5 Main Window ........................................................................................................ 52.6 Dialogs and Active Objects ........................................................................................ 63 EVM Hardware ............................................................................................................. 193.1 Connectors and Jumpers......................................................................................... 193.2 EVM Schematics .................................................................................................. 223.3 EVM Bill of Materials .............................................................................................. 23Appendix A USB-MODEVM Schematic ...................................................................................... 25Appendix B USB-MODEVM Bill of Materials ................................................................................ 26Appendix C USB-MODEVM Protocol ......................................................................................... 28

List of Figures

1 TSC2117 EVM + USB MODEVM.......................................................................................... 32 Main Window ................................................................................................................. 53 Initialization Script ........................................................................................................... 74 Command Dialog ............................................................................................................ 85 Register Inspector ........................................................................................................... 96 Clock and Digital Signal Routing ......................................................................................... 117 Digital Configuration: Codec Clock / PLL ............................................................................... 128 Advanced Clock Settings. ................................................................................................. 139 Audio Interface .............................................................................................................. 1410 Touch Screen Active Object .............................................................................................. 1511 SAR ADC Data ............................................................................................................. 1612 Automatic Gain Control .................................................................................................... 1713 DRC Transfer Function and DRC Dialog ............................................................................... 18

I2S, I2C are trademarks of Koninklijke Philips Electronics N.V.Windows is a trademark of Microsoft Corporation.SPI is a trademark of Motorola, Inc.

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1 EVM Overview

1.1 Introduction

1.2 Box Contents

1.3 Related Documentation From Texas Instruments

EVM Overview

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List of Tables

1 Analog I/O ................................................................................................................... 192 Touch Screen ............................................................................................................... 193 GPI ........................................................................................................................... 194 Jumpers ..................................................................................................................... 205 Expansion Connectors P12/J12 .......................................................................................... 206 Expansion Connectors P22/J22 .......................................................................................... 217 Power Supply ............................................................................................................... 21B-1 USB-MODEVM Bill of Materials .......................................................................................... 26C-1 USB Control Endpoint HIDSETREPORT Request .................................................................... 28C-2 Data Packet Configuration ................................................................................................ 28C-3 GPIO Pin Assignments .................................................................................................... 31

The TSC2117EVM-K features a TSC2117 touch screen controller with stereo audio codec, amplifiers forspeakers and headphones and a digital signal processing module.

Together with the USB-MODEVM board, the TSC2117 Control Software and a PC running Windows XP, itis a plug-and-play solution to evaluate the capabilities of the TSC2117.

The USB-MODEVM board contains a TAS1020B streaming audio USB controller, which enumerates as aUSB audio class device.

When the USB-MODEVM + TSC2117 EVM is connected to a PC running Microsoft Windows XP, it will berecognized as a sound card. Once the TSC2117 is configured using the TSC2117 control software, anyaudio playback and record software on the PC that uses the Windows audio subsystem (sound card) canuse the TSC2117.

Besides configuration, the TSC2117 control software allows evaluation of the touch screen module of theTSC2117. The TSC2117 is compatible with 4 wire resistive touch screens (not provided by TI).

The following items ship with the TSC2117EVM-K:•TSC2117 EVM•USB-MODEVM

The control software required to operate the EVM is available from the TSC2117 product folder athttp://www.ti.com

TSC2117 data sheet (SLAS550 )

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2 EVM + PC

2.1 EVM Preparation

TSC2117_RGZ_EVM

SW2

J6 Speakers

J1 Line In

USB-MODEVM

J4 Touchscreen

Headphones

J7 USB

ON OFF

2.1.1 Analog Signal Connections

2.1.2 Touch Screen Connections

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EVM + PC

This chapter explains how to use the TSC2117 EVM with a PC running Windows XP.

To interface the TSC2117 EVM with a PC using USB, plug the TSC2117 EVM onto the USB-MODEVM asshown in Figure 2 1. TSC2117 EVM + USB MODEVM.

Figure 1. TSC2117 EVM + USB MODEVM

Note: USB-MODEVM configuration

To control the TSC2117 from the PC via the USB-MODEVM, set switch SW2 position 1, 3, 4,5, 6, 7 to ON and position 2 and 8 to OFF.

•Connect a headphone to J8 (3,5 mm jack)•Connect 8- Ωspeakers to J6 (4 screw terminal)– Left speaker to SPLN and SPLP– Right speaker to SPRN and SPRP•Connect a line-level audio source to J1 (3,5 mm jack)

The TSC2117 EVM is compatible with 4-wire resistive touch screens. Connect the touch screen to J4 (X+,X–, Y+, Y–).

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2.2 Control Software

2.3 Installation

2.4 Concepts

EVM + PC

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The TSC2117 control software exposes most features of the TSC2117 through an intuitive graphical userinterface.

Note: Before Windows on the PC can use the TSC2117EVM-K as a sound card, the TSC2117 onthe EVM must be configured (sampling rate, audio routing, internal amplifier settings etc.)with the TSC2117 control software.

Download the TSC2117 control software (SLAC264 ) from the TSC2117 product folder at http://www.ti.comand launch the program (SLAC264 ).

This file is a self-extracting archive. The default target folder is:

C:\Program Files\Texas Instruments\TSC2117Click the Unzip button to complete the installation.

The TSC2117 control software is now available in the target folder. The name of the executable isTSC2117.exe

To launch the TSC2117 control software, navigate to the target folder with the Windows Explorer anddouble click TSC2117.exe.

The TSC2117 control software presents a block diagram view of the TSC2117 (or select modules withinthe TSC2117).

The block diagram consists of active objects that can react to user input (for example switches oramplifiers with variable gain that show a volume control on a mouse click event).

Note: Each active object will change color to red if the mouse cursor is above the object. Clickingthe object will trigger its function.

Some active objects are linked to control register(s) of the TSC2117 in a two way fashion. If an EVM isconnected, the control software will update the appropriate register(s) whenever an active object istriggered. If a register that is linked to an active object is changed via other components (for example thescript interpreter or the register inspector), the active object will change its state accordingly.

The control software will automatically detect a TSC2117EVM-K once it is connected to a USB port of thePC.

If no TSC2117EVM-K is connected to the PC, the control software changes to a simulation mode, where itis possible to retrieve script commands based on user input within the block diagram.

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2.5 Main Window

•Full featured TSC2117

•Playback only

•Record only

•Touch Screen only

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EVM + PC

Figure 2. Main Window

At the top of the main window is a tool bar with buttons to change between four different use cases of theTSC2117:

By default, the control software displays the full featured block diagram of the TSC2117.

Each use case has its own initialization script, which will run if a use case is selected by clicking on one ofthe use case buttons. The initialization script contains register settings for the TSC2117 to configure thedevice for a specific use case.

The toolbar contains a control that determines the zoom factor. Change the zoom by selecting the desiredzoom factor.

To move the block diagram, click on a blank area within the block diagram and drag the diagram with themouse.

At the bottom of the main window is a status bar that provides information about the state of thecommunication between the control software and the TSC2117EVM-K. It also shows hints about elementsin the block diagram, for example the I2C page and register / bit location of a selected switch.

Audio signal paths (both digital and analog) will change color from black to•Blue for left audio output•Turquoise for right audio output

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2.5.1 Using Active Objects

2.6 Dialogs and Active Objects

EVM + PC

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•Magenta for audio input

once they are activated via switches. This feature visualizes all audio paths and immediately highlights if apath is disabled.

Moving the mouse pointer over an active object will light up the active object (the color of the object turnsred).

For example, the Class-A/B HP Driver left amplifier active object will turn from its inactive state to its activestate when the mouse pointer enters the amplifier symbol:

Clicking the activated object will trigger its function. In the case of the amplifier active object, the functionis a volume control. Moving the volume control slider changes the volume setting of the amplifier (it is alsopossible to change the volume by clicking onto the number within the amplifier symbol and typing the newgain setting).The control software updates the appropriate register in the TSC2117 and as a result thevolume on the headphone output will change accordingly.

The TSC2117 control software contains several dialog windows that give access to additional features.

Most dialogs are linked to active objects and are opened by clicking on the active object.

A few dialogs are not linked to active objects and are opened using the View menu.

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2.6.1 Init Script Dialog

Each use case , , , owns a unique initialization script which will automatically run when a

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EVM + PC

TSC2117EVM-K is detected or if the user selects another use case.

To show or edit the initialization script, choose View->Init Script …from the main window menu bar.

Figure 3. Initialization Script

Click the Run button to run the script again. For further information about the script syntax, see Figure 3 .

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2.6.2 Command Dialog

EVM + PC

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Open the command dialog (View->Command …) to write, edit, load, save and run command scripts.Command scripts are text files that contain commands to communicate with the TSC2117. The syntax isdescribed in Figure 4 .

Figure 4. Command Dialog

•The main area of the command dialog is command buffer (editable text) which contains the commandscript. To run the command script, click the Run button.•The smaller read only text area on the right side of the command dialog displays control data readfrom the TSC2117. The Clear button clears the Read Data field.•The one line text edit field on the left bottom allows single command execution.•The Record check box enables recording of commands generated by the control software.

Figure 4 shows a recording of the volume control for the left Class-A/B HP Driver amplifier (note that theRecord checkbox is checked).

A single command to read four bytes starting at address 0x28 was executed and the result is displayed inthe Read Data field.

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2.6.3 Register Inspector

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EVM + PC

The register inspector dialog (View->Register Inspector …) gives access to all registers of the TSC2117.

Figure 5. Register Inspector

The register inspector displays the content of the TSC2117 registers. The control software will read allTSC2117 registers when a TSC2117EVM-K is detected. To force reading the content of one page, clickthe Refresh button.•The Page edit field selects the page to be displayed.•The addr column shows the address of the registers within the selected page in decimal notation.•The description column contains a description for each register. If the register has no functionassigned, it is declared Reserved.•The data columns show the data of each register (one byte). The first data column uses decimalnotation, the second uses hexadecimal notation. It is possible to change the register value by clickinginto one of the data fields and typing the new value (either decimal or hexadecimal).•The numbered columns show the register content in binary notation. Read/Write bits are shown solidblack or red; read only bits are gray or dark red. Red numbers represent bits that recently changed. Tochange a single writeable bit, click on the bit and it will flip.

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2.6.4 DAC Filter

EVM + PC

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One of the digital signal processing blocks of the TSC2117 implements five digital biquad filters. The DACdigital filter dialog (View->DAC Filter …) allows real time graphical manipulation of the digital filters.

The control software will automatically configure the digital signal processing block when the DAC digitalfilter dialog is opened.

The digital filter dialog limits the range of each digital biquad filter to +/-12[dB] (this is an arbitrary limitationfor demonstration purposes).•Each biquad has its own unique handle with a unique color. Each handle will light up white if themouse pointer is in the vicinity, showing that it can be selected. To change the frequency and gain of abiquad, grab and drag its handle.It is also possible to change the gain using the slider for each biquad.•Each biquad can be configured for parametric EQ, Shelf Treble or Shelf Bass. If it is configured for EQ,press the shift key before selecting the handle to adjust the bandwidth of the EQ using the mousepointer.

•Due to digital range limitations, the biquads will automatically scale, if the biquad coefficients exceedthe limitations.

The coordinate system will shift accordingly to reflect the resulting attenuation.•To avoid clipping, add additional attenuation with the Attenuate slider.•To retrieve the biquad coefficients, open the command dialog (see 0) and check Record.

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