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This exercise introduces the DSP hardware and associated software used in the course. By the end of this module, you should be comfortable with the basics of testing a simple real-time DSP system with Code Composer Studio, the TI DSP c55x debugging environment. First you will connect the laboratory equipment and test a real-time DSP system with provided code to implement an eight-tap (eight coefficient) finite impulse response (FIR) filter. With a working system available, you will then begin to explore the debugging software used for downloading, modifying, and testing your code. Finally, you will create a filter in MATLAB and use test vectors to verify the DSP's output.

Introduction

This exercise introduces the work-flow environment for developing real-time signal-processing systems, which consists of three major components:

  1. hardware I/O tools (i.e., a function generator and oscilloscope), which are valuable for testing the functionality of a real-time DSP system,
  2. a software debugging environment, such as Code Composer Studio (CCS), which is used to write, download, execute, and debug DSP code,
  3. a high-level development environment, such as MATLAB, which is used to verify computational correctness, and explore and debug conceptual issues.

The DSP task in this exercise will be to implement a pre-written eight-tap (eight coefficient) finite impulse response ( FIR ) filter, verifying correctness using the hardware I/O tools, along with MATLAB test vectors.

Lab equipment

This exercise assumes you have access to a laboratory station equipped with a Texas Instruments TMS320C5510A-200 digital signal processor chip mounted on a Spectrum Digital TMS320VC5510 evaluation board. The DUAL3006, a daughtercard produced by Educational DSP, is mounted on the external peripheral interface of the board to enable four-input/four-output capability. The evaluation module should be connected to a PC running Windows and will be controlled using CCS v5.0. We will be using a 48kHz sample rate.

If you are not using Code Composer Studio v5.0, the instructions on this page do not apply. Please see the Digital Signal Processing Laboratory (ECE 420 55x) Collection for instructions for version 4.0 and earlier.

In addition to the DSP board and PC, each laboratory station should also be equipped with a function generator to providetest signals and an oscilloscope to display the processed waveforms.

Step 1: connect cables

Use the provided BNC cables to connect the output of the function generator to the input of the DSP evaluation board, and the DSP outputs to the oscilloscope, as shown in [link] .

Example hardware setup

The actual channel ports may differ than what is shown in the illustration. Read the labels on the evaluation board!

With this configuration, you will have only one signal going into the DSP board and two signals coming out.The output on channel 1 is the filtered input signal, and the output on channel 2 is the unfiltered input signal.This allows you to view the raw input and filtered output simultaneously on the oscilloscope. Turn on the functiongenerator and the oscilloscope.

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Source:  OpenStax, Ece 420 fall 2013. OpenStax CNX. Sep 26, 2013 Download for free at http://cnx.org/content/col11560/1.3
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