<< Chapter < Page Chapter >> Page >

Replace the ramp generator input with a step function. This simulates someone stamping on the gas!

Reference simulation for f2812

Running the vehicle dynamics simulation

Open VehicleDynamicsF2812Simulation.mdl .

Modified Model for F2812

Run this model. This is the behavior that should be seen when the real-time model is run on the ezDSP for F2812.

Creating your own models

Creating a new matlab model

Start Matlab 7.3.0 R2006b

In the top left hand corner of the Matlab screen, select: File ->New ->Model.

A New MatLab Model

The following screen will appear.

An Empty MatLab Model

Saving the new model

Save the model as “vehicle_dynamics.mdl”.

Saving the new model

Opening the library browser

Select View->Library Browser

Selecting the Library Browser

Selecting the subsystems

A list of available blocks will appear. Select “Commonly used blocks”. Highlight “Subsystems”. Drag-and-drop two copies of this block into the model.

The Simulink Library Browser

Subsystems added

Rename the Subsystems to “Engine Management” and “Vehicle Dynamics”.

Subsystems Added

Drag-and-drop a “saturation” block onto the model.

Adding a ramp generator

From the Simulink Library Browser, select “Sources”. Drag-and-drop the “Ramp” block onto the model.

Adding a Ramp Generator

Adding scope blocks

From the Simulink Library Browser, select “Sinks”.

Drag-and-drop the “Scope” block onto the model twice.

Drag-and-drop the “Display” block onto the model twice.

Adding a Scope

Joining and renaming the blocks

Join the blocks as shown in the figure below. Change the names and add a title.

First Blocks Added

Setting the solver

The ode45 solver is not suitable for use with DSP. “Fixed Point Discrete” is required.

Configuring the Solver

The engine management subsystem

Overview of the engine management subsystem

The first stage of the Engine Management Subsystem is a “Gain” block, which converts the Gas Pedal input (0-100%) to 0-4000 rpm.

The second stage is a lookup table. This converts from rpm to hp.

The Engine Management Subsystem

Adding a lookup table

From the Simulink Lookup Tables, drag-and-drop the “Lookup Table” block onto the model.

Adding a Lookup Table

Double click on the “Lookup Table” block.

Lookup Table Block Parameters

The values for the table can also be inserted as a table. Click on the “Edit” box.

Lookup Table Values

Click on "Plot" as shown above, and you will see:

Adjusting the Lookup Table

The vehicle dynamics subsystem

Overview of vehicle dynamics subsystem

The C28x operates in discrete-time; therefore the continuous integrator must be replaced by a “Discrete Time Integrator” for DSP model implementation.

Vehicle Dynamics Subsystem

Select the “Main” tab. Change the “Constant value” to 0. Click on “OK”.

Running the simulation

The ramp generator gently changes the Gas Pedal from 0% to 100%. This simulates smooth acceleration. The Horsepower and Vehicle Speed are shown on the graphs.

Running the Simulation

Modifications for ezdsp f2812

In order to run the model on the ezDSP F2812, some additional blocks need to be added to the project:

  • An Analog-to-Digital Converter (ADC) to allow a potentiometer input.
  • A block to scale the ADC input to the range 0 to 100%.
  • A Digital-to-Analog Converter (DAC) to convert the Vehicle Speed to an analog output in the range 0 to 3.3V

Connecting the f2812 ezdsp

For Matlab and Simulink to run correctly, you need to run the F2812 ezDSP.

Connect the F2812 hardware to the parallel port of the computer and turn on the supply to the board.

When the board is powered, the two green LED lights on the board will come on during self-test.

Start Code Composer Studio for F2812 ezDSP and use Debug ->Connect

Startup Screen for Code Composer Studio (CCS)

Opening the library browser

Select View->Library Browser

Selecting the Library Browser

A list of available blocks will appear. We are particularly interested in the “Embedded Target for TI C2000 DSP”. Click on this selection.

In the following sections we will select the building blocks for the DSP model shown in Figure 30.

The Simulink Library Browser

Selecting target preferences

From the C2000 Target Preferences, select “F2812 ezDSP”. Drag-and-drop the icon onto the new model.

Figure 26 – Selecting Target Preferences

When the following screen appears, it is important to select “Yes”.

Initializing Simulation Parameters

Scaling the adc readings

To scale the ADC reading to the Gas Pedal 0 to 100% we will multiply the ADC input by 800 then divide by 32768.

Figure 28 – Scaling the ADC

Scaling the dac output

To scale the kph to the DAC output, we will multiply the kph input by 312.5. The “Saturation” block limits the output to 200 kph.

Scaling the DAC

The finished model

To scale the kph to the DAC output, we will multiply the kph input by 312.5.

The Final Model

Building the model

Select Tools ->Real-Time Workshop ->Build Model.

Building the Model

You may find the final model here .

Comparing performance

The real-time model running on the ezDSP F2812 should now be behaving in the same way as the Simulation.

References

  1. Spectrum Digital Incorporated, "eZdspTM F2812 Technical Reference" Rev. F, September 2003. ( (External Link) )

Questions & Answers

can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
ninjadapaul
20/(×-6^2)
Salomon
okay, so you have 6 raised to the power of 2. what is that part of your answer
ninjadapaul
I don't understand what the A with approx sign and the boxed x mean
ninjadapaul
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
Salomon
I'm not sure why it wrote it the other way
Salomon
I got X =-6
Salomon
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
ninjadapaul
oops. ignore that.
ninjadapaul
so you not have an equal sign anywhere in the original equation?
ninjadapaul
Commplementary angles
Idrissa Reply
hello
Sherica
im all ears I need to learn
Sherica
right! what he said ⤴⤴⤴
Tamia
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
Kim
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Al
y=10×
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
is it 3×y ?
Joan Reply
J, combine like terms 7x-4y
Bridget Reply
im not good at math so would this help me
Rachael Reply
yes
Asali
I'm not good at math so would you help me
Samantha
what is the problem that i will help you to self with?
Asali
how do you translate this in Algebraic Expressions
linda Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Good
Got questions? Join the online conversation and get instant answers!
QuizOver.com Reply

Get the best Algebra and trigonometry course in your pocket!





Source:  OpenStax, From matlab and simulink to real-time with ti dsp's. OpenStax CNX. Jun 08, 2009 Download for free at http://cnx.org/content/col10713/1.1
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'From matlab and simulink to real-time with ti dsp's' conversation and receive update notifications?

Ask