lab 10 ti c6713 dsk introduction wls - unidesh · lab 10 ti c6713 dsk introduction wls.605 page 5...

LAB 10 TI C6713 DSK Introduction WLS.605

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Objective

• This document introduces you to using the Embedded Target for C6000 DSP with Real-

Time Workshop to develop digital signal processing applications for the Texas Instruments

C6000 family of DSP development hardware, such as the Texas Instrument TMS320C6713

Developer's Starter Kit.

• You will develop a simple reverberation (echo) system example and load it onto the Texas

Instrument TMS320C6713 Developer’s Starter Kit.

Introduction

For simplicity this tutorial will use the following abbreviations from this point forward:

Title Abbreviations

Digital Signal Processor DSP

Texas Instrument TI

TMS320C6713 Digital Signal Processor C6713 DSP

TMS320C6713 Developer’s Starter Kit C6713 DSK

Code Composer Studio CCS

Embedded Target for C6000 DSP C6x Target

Real-Time Workshop RTW

American National Standards Institute ANSI

DSP Hardware

Although all processors, such as the Intel Pentium 4 processor, have the ability to process digital

signals, not all of them can process digital signals equally well. DSP processors, such as the TI

C6713 DSP, are specifically designed to process digital signals well. Despite their differences,

however, there are many similarities among them. In the example shown in Figure 1 below, you

may relate the TI C6713 DSK components with those of a personal computer.


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Figure 1: PC and C6713 DSK Analogy

DSP Software:

The TI C6713 DSK, like a personal computer, also needs to load software to establish its

behaviour and function. These software can be designed in a variety of approaches. The design

approach that the upcoming labs will follow is illustrated in Figure 2 below. The designer will

begin with a concept of what they want to program. The next step is to model the concept with

blocks from Simulink’s large collection of prewritten blocksets. Basically, a block diagram that

models the concept is built using Simulink. If a specific block required is not included in

Simulink’s blocksets, the designer may choose to write their own blocks from scratch using

Matlab. At this point the design is still not designed to operate on any specifically hardware. To

do that, the designer uses the C6x Target and RTW to generate (or build) ANSI C code intended

for the TI C6713 DSK. The C6x Target will then automatically take the generated ANSI C code

and uses the TI CCS tools to compile specific machine code and finally loads the targeted

machine code to the TI C6713 DSK hardware. For the experienced designer, they may choose to

directly write the ANSI C code.


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Figure 2: Software design flow

Preparations:

1. Gather the following equipments.

• Computer with Simulink, CCS, C6x Target, and RTW installed

• TI C6713 DSK

• DSK power adapter

• DSK USB cable

• Microphone

• Speakers/Headphones

• TI Driver CD

Procedure:

In this tutorial you will create and build a model that simulates audio reverberation applied to an

input signal. Reverberation is similar to the echo effect that you can hear when you shout across

an open valley or canyon, or in a large empty room.

Part A: Building the Reverberation Model using Simulink

2. Open Matlab.


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3. Click on to open Simulink Library Browser.

4. Create a new model by selecting File �New �Model from the Simulink menu.

Figure 3: Reverberation Simulink model.

5. You will build the reverberation model, as shown in Figure 3 above, from blocks located in the

Simulink Library Browser. From the Simulink Library Browser, double click on Signal

Processing Blockset �Signal Operations. Drag and drop the Delay block onto the new model

page.

6. Alternatively, you may type in the name of the block into the Find field located at the top of

the Simulink Library Browser menu to search for the block. Then drag-and-drop the block onto

the new model page. Try that approach for the Gain blocks.

7. Use either approach described in step 0 and 6, insert the remaining blocks listed in Table 1 into

the Simulink model:

Table 1: Remaining blocks

Block Name Block Location

C6713 DSK ADC Embedded Target for TI C6000 DSP→

C6713 DSK Board Support

C6713 DSK DAC Embedded Target for TI C6000 DSP→

C6713 DSK Board Support

Sum Simulink→Math Operations

8. The new Simulink model page should now look similar to that shown in Figure 4 below.

Figure 4: Inserting Simulink Blocks


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9. Format the orientation of the blocks by right-clicking on the block →Format →Flip block or

Rotate block. Flip one of the Gain blocks as shown in Figure 5 below.

Figure 5: Formatting Block Orientation

10. Most Simulink blocks have parameters that can be adjusted by double-clicking on it. Adjust

all the blocks according to Table 2 summarized below. The result should be the same as shown in

Figure 6 below.

Table 2: Block Parameters

Block Name Block Parameters Parameter Value

C6713 DSK ADC

ADC Source:

+20 dB Mic gain Boost:

Stereo:

Sample rate:

Word length:

Output data type:

Scaling:

Samples per frame:

Mic In

No

Yes

48 kHz

20-bit

Single

Normalize

64

C6713 DSK DAC

Word length:

Scaling:

Overflow mode:

20-bit

Normalize

Saturate

Sum (left)

Icon shape:

List of signs:

Sample time:

Round

++|

-1 (inherited)

Sum (right)

Icon shape:

List of signs:

Sample time:

Round

|++

-1 (inherited)

Delay

Delay units:

Delay (frames):

Frames

140

Gain

Gain:

Multiplication:

Sample time:

0.8

Element-wise

-1 (inherited)

Gain1 Gain:

Multiplication:

Sample time:

0.9

Element-wise

-1 (inherited)


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Figure 6: Adjusting Block Parameters

11. Now it is time to connect these blocks together using signal lines. Look closely at each of the

blocks for different orientations of the ‘>’ symbol. These are I/O ports. If the symbol is pointing

towards its own block then it is an input port. If the symbol is pointing away from its own block

then it is an output port. To direct signal from one block to another, left-click on the output port,

drag to the input port, and release the mouse button. To branch off of one signal line, right-click

on the signal line where the branch is to occur and drag to the port that it is intended to connect,

and then release the mouse button. Refer to Appendix A below for more signal line manipulation

actions. The result should be similar to that shown in Figure 7 below.

Figure 7: Complete Reverberation Model

Part B: Hardware Setup

12. CAUTION! First connect the power extension cord to the AC adapter, and then connect the

AC adapter to the C6713 DSK. This will prevent a sudden surge of power to the C6713 DSK that

can severely damage it. DO THIS FIRST!

13. Once the power is connected to the C6713 DSK, connect the remaining equipment to the

DSK as illustrated in Figure 8 below. DO THIS SECOND!


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Figure 8: Reverberation Hardware Setup

14. Once the USB cable is connected to the computer and the C6713 DSK, the computer will

require a driver installation for the C6713 DSK. Insert the TI driver CD into the computer and

install the appropriate driver. Note: Select Install from a specific location and then choose to

Search for drivers in CD-ROM.

15. Run the 6713 DSK Diagnostics Utility (under Start→Programs→Texas

Instruments→Code Composer Studio ‘C6713 DSK Tools 2) to verify that the C6713 DSK

functions. Click Start and wait until the test is done. The result should appear similar to Figure 9

below.


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Figure 9: 6713 DSK Diagnostics Results

16. All diagnostic tests, with the exception of the External Memory, should pass. If not,

disconnect the USB cable, reconnect the USB cable, reinstall the TI drivers, and then run the test

again.

Part C: TI C6x Target Configuration

17. With the Simulink model still opened, click on Simulation →Configuration parameters

and a dialog box opens.

18. On the Select pane, click on Solver.

19. The Solver pane allows you to:

• set the simulation start and stop times,

• choose the solver and specify its parameters, and

• select output options.

20. Set the start time to 0 and the stop time to 300. This will allow the C6713 DSK to run for 5

minutes.


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21. From the Type option menu, select fixed-step. This will make the C6713 DSK output value

at each clock period even though the output value may not have changed.

22. Leave the other parameters as default. The result should be as shown in Figure 10 below.

Figure 10: Solver parameters

23. On the Select pane, click on Real-Time Workshop.

24. The RTW pane lets you set parameters that directly affect code generation and optimization.

The RTW pane also lets you initiate and control the build process, with the aid of the C6x Target.

25. On the Target selection pane, click on Browse. This opens the System Target File Browser.

The browser displays a list of all currently available target configurations. When you select a

target configuration, RTW automatically chooses the appropriate system target file, template

makefile, and make command specifically to the Hardware/Software.

26. Select the ti_c6000.tlc (Embedded Target for TI C6000 DSP (GRT)) entry in the list of

available configurations. The result should be as shown in Figure 11 below. Click OK to confirm

the selection.


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Figure 11: Choosing the Target file

27. On the Select pane and under Real-Time Workshop, click on TI C6000 target selection.

28. Choose C6713DSK from the Code generation target type menu. This will select the codes

specific to the C6713DSK hardware.

29. On the Select pane and under Real-Time Workshop, click on TI C6000 runtime.

30. Choose build and_execute from the Build action menu.

31. Leave the other parameters as default.

32. Confirm that the current Matlab working directory is c:\matlab7\work as shown in Figure 12

below.

Figure 12: Matlab Current Working Directory


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33. Click on the Increment Build button to order RTW to start building the Simulink

model into ANSI C code and then controlling CCS to build the executable file. Afterwards, RTW

will also automatically load the executable file into the C6713 DSK and run it.

Part D: Reverberation System Test

34. Once the executable is loaded into the C6713 DSK, speak into the microphone and listen for

the echo sound effect from the headphones.

35. Adjust the delay time of the delay block to 80 frames instead of 140 frames and rebuild the

model. What happens to the sound effect?

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Summary

The following topics were covered in this tutorial. You may want to review these topics before

moving to the next lab.

• The similarities between general processing systems and the C6713 DSK.

• The concept to implementation design flow using Matlab, Simulink, RTW,C6x Target,

CCS, and the C6713 DSK.

• Building a Simulink model.

• Configuring a Simulink model for the C6713 DSK.

• Building ANSI C code from a Simulink model.

• Building executable from ANSI C code. Plus loading executable onto the C6713 DSK.

• Setting up the C6713 DSK hardware.


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Appendix A: Summary of Mouse and Keyboard Actions

These tables summarize the use of the mouse and keyboard to manipulate blocks, lines, and

signal labels. If you have time, it is beneficial for you to become familiar with these editing

commands. LMB means press the left mouse button; CMB, the center mouse button; and RMB,

the right mouse button.

Manipulating Blocks

The following table lists mouse and keyboard actions that apply to blocks.

Task Microsoft Windows UNIX

Select one block LMB LMB

Select multiple blocks Shift + LMB Shift + LMB; or CMB alone

Copy block from another

window

Drag block Drag block

Move block Drag block Drag block

Duplicate block Ctrl + LMB and drag; or RMB

and drag

Ctrl + LMB and drag; or RMB

and drag

Connect blocks LMB LMB

Disconnect block Shift + drag block Shift + drag block; or CMB

and

drag

Open selected subsystem Enter Return

Go to parent of selected

subsystem

Esc Esc

Manipulating Lines

The following table lists mouse and keyboard actions that apply to lines.


Select one line LMB LMB

Select multiple lines Shift + LMB Shift + LMB; or CMB alone

Draw branch line Ctrl + drag line; or RMB and

drag line

Ctrl + drag line; or RMB +

drag

line

Route lines around blocks Shift + draw line segments Shift + draw line segments; or

CMB and draw segments

Move line segment Drag segment Drag segment

Move vertex Drag vertex Drag vertex

Create line segments Shift + drag line Shift + drag line; or CMB +

drag line


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Manipulating Signal Labels

The next table lists mouse and keyboard actions that apply to signal labels.


Create signal label Double-click line, then enter

label

Double-click line, then enter

label

Copy signal label Ctrl + drag label Ctrl + drag label

Move signal label Drag label Drag label

Edit signal label Click in label, then edit Click in label, then edit

Delete signal label Shift + click label, then press

Delete

Shift + click label, then press

Delete

Manipulating Annotations

The next table lists mouse and keyboard actions that apply to annotations.


Create annotation Double-click in diagram, then

enter text

Double-click in diagram, then

enter text

Copy annotation Ctrl + drag label Ctrl + drag label

Move annotation Drag label Drag label

Edit annotation Click in text, then edit Click in text, then edit

Delete annotation Shift + select annotation, then

press Delete

Shift + select annotation, then

press Delete

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