signal processing with matlab: system simulation and real-time implementation · 2 why are we here...

1© 2014 The MathWorks, Inc.

Signal Processing with MATLAB: System Simulation

and Real-Time Implementation

Jonas Rutström

Senior Application Engineer

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Why are we here today?

Learn more about algorithm and system design in MATLAB and Simulink

– The why, how, and what…

Hopefully get some new ideas that makes you work easier

– There is always someting new to learn…

Give you the possibility to talk with MathWorks representatives

– Share your thoughts, give us feedback – We are here for you!

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Algorithm Development

ALGORITHM

Hardware Implementation

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DEMO(Kinect)

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From MATLAB Script to Real-Time C Code

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C/C++

MATLAB1. Experiment with algorithm in MATLAB

2. Customize the MATLAB code

3. Generate C/C++ code

4. Verify/validate generated code

5. Optimize generated code

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1. Experiment with algorithm in MATLAB





C/C++

MATLAB

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A closer look at the algorithm…

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delay

Sound source

delay

𝜃

ALGORITHM

d

d

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How to calculate the delay?

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Cross-correlation Interpolation

Delay

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Simplify:

– Get a static source

– Take a picture

– Record the stereo audio input

Understand your setup

– Distance between microphones?

– Resonable delay?

Implement according to the masterplan

– verify the result

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DEMO(MATLAB Script)

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What is the next step?

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C/C++

MATLAB

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How do you intend to use the algorithm?

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“Real-Time”

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Function + Test bench

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Testability

Re-usability

C code generation

Algorithm

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Testability

Re-usability

C code generation

AlgorithmAlgorithm

AlgorithmAlgorithm

Algorithm

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Testability

Re-usability

C code generation

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DEMO(Algorithm + Test Bench + Code Generation)

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2. Customize the MATLAB Code

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Performance?

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tic/toc

% start timer

tic

% execute code

out = myFunction(in);

% stop timer (and store

% elapsed time)

et = toc;

profile

% turn on profiler

profile on

% execute code

out = myFunction(in);

% turn off profiler

profile off

% open html report

profile report

Where are the bottlenecks?

2. Customize the MATLAB Code

How long did it take?

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Before After

2. Architect/review/optimize MATLAB code

Let´s profile two versions of the interpolate function!

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DEMO(Profiling)

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Alternative 1 Alternative 2


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Alternative 1 Alternative 2

Interpolation: 5x faster Algorithm: > 2x faster


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Lesson learned from profiling?

– Separate initialization and setup from recurring execution


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Can we make it execute faster?

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C/C++

MATLAB

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DEMO(MATLAB to C MEX)

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~8x faster

3. Generate C/C++ Code

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Are there other implementation options?

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System Objects

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init/setup

process

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~ 2X faster in MATLAB

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~3x faster in C


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C/C++

MATLAB

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4. Verify/Validate Generated Code

Software-in-the-Loop Verification

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DEMO(Software-in-the-Loop)

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C/C++

MATLAB

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4. Optimize Generated Code

Operator level (e.g. fixed-point arithmetic)

c = a + b

*c = _sadd(a, b)

Routine level

out = matlabFcn(in)

optimFcn(*in, *out)

Solution: Code Replacement Libraries (CRL)(requires Embedded Coder)

coder.replace

http://www.mathworks.com/help/releases/R2012b/ecoder/code-and-operator-replacement.html

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4. Optimize Generated Code

coder.ceval('cfun_name', arg1, arg2, …)

Calling legacy code

Non-algorithmic code (e.g. peripherals, profiling)

Interacting with larger C/C++ application

Verifying C/C++ using existing MATLAB testbench

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What if software is not fast enough?

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HW/SW Co-Design

= +SoftwareHardwareSystem

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HW/SW Co-DesignThe Zynq Platform - Example

FPGAARM

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HDL MATLAB

Generating HDL Code

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DEMO(MATLAB HDL Code)

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HDL

Manual Translation

Manual Verification

MATLAB

Verifying Handwritten HDL Code

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DEMO(Verification of Handwritten HDL Code)

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Algorithm Development

ALGORITHM

Hardware Implementation

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C/C++

MATLAB

Summary | Algorithm Development

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Summary | Hardware Implementation

= +SoftwareHardwareSystem

“Integrated Workflow for both SW and HW System Design”

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Contact us for more information:

www.mathworks.com

Wrap Up and Q & AMore information…

http://www.mathworks.com/

signal processing with matlab: system simulation and real-time implementation · 2 why are we here...

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