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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

what is the coefficient of -4×
Mehri Reply
-1
Shedrak
the operation * is x * y =x + y/ 1+(x × y) show if the operation is commutative if x × y is not equal to -1
Alfred Reply
An investment account was opened with an initial deposit of $9,600 and earns 7.4% interest, compounded continuously. How much will the account be worth after 15 years?
Kala Reply
lim x to infinity e^1-e^-1/log(1+x)
given eccentricity and a point find the equiation
Moses Reply
12, 17, 22.... 25th term
Alexandra Reply
12, 17, 22.... 25th term
Akash
College algebra is really hard?
Shirleen Reply
Absolutely, for me. My problems with math started in First grade...involving a nun Sister Anastasia, bad vision, talking & getting expelled from Catholic school. When it comes to math I just can't focus and all I can hear is our family silverware banging and clanging on the pink Formica table.
Carole
I'm 13 and I understand it great
AJ
I am 1 year old but I can do it! 1+1=2 proof very hard for me though.
Atone
hi
Adu
Not really they are just easy concepts which can be understood if you have great basics. I am 14 I understood them easily.
Vedant
find the 15th term of the geometric sequince whose first is 18 and last term of 387
Jerwin Reply
I know this work
salma
The given of f(x=x-2. then what is the value of this f(3) 5f(x+1)
virgelyn Reply
hmm well what is the answer
Abhi
If f(x) = x-2 then, f(3) when 5f(x+1) 5((3-2)+1) 5(1+1) 5(2) 10
Augustine
how do they get the third part x = (32)5/4
kinnecy Reply
make 5/4 into a mixed number, make that a decimal, and then multiply 32 by the decimal 5/4 turns out to be
AJ
how
Sheref
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
hmm
Abhi
is it a question of log
Abhi
🤔.
Abhi
I rally confuse this number And equations too I need exactly help
salma
But this is not salma it's Faiza live in lousvile Ky I garbage this so I am going collage with JCTC that the of the collage thank you my friends
salma
Commplementary angles
Idrissa Reply
hello
Sherica
im all ears I need to learn
Sherica
right! what he said ⤴⤴⤴
Tamia
hii
Uday
hi
salma
hi
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Hello
opoku
hi
Ali
greetings from Iran
Ali
salut. from Algeria
Bach
hi
Nharnhar
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
A soccer field is a rectangle 130 meters wide and 110 meters long. The coach asks players to run from one corner to the other corner diagonally across. What is that distance, to the nearest tenths place.
Kimberly Reply
Jeannette has $5 and $10 bills in her wallet. The number of fives is three more than six times the number of tens. Let t represent the number of tens. Write an expression for the number of fives.
August Reply
What is the expressiin for seven less than four times the number of nickels
Leonardo Reply
How do i figure this problem out.
how do you translate this in Algebraic Expressions
linda Reply
why surface tension is zero at critical temperature
Shanjida
I think if critical temperature denote high temperature then a liquid stats boils that time the water stats to evaporate so some moles of h2o to up and due to high temp the bonding break they have low density so it can be a reason
s.
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
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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
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