VisSim for Model Based
Embedded System
Development
Visual Solutions, Inc.
487 Groton Road, Westford MA 01886 USA
(800) VISSIM-1
www.vissim.com
Agenda
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Visual Solutions Introduction
VisSim Product Review
VisSim Demo
Target-in-loop simulation + code gen demo
Visual Solutions
• Founded in 1989
• Headquarters in Westford, Mass
• Over 350,000 licenses worldwide
• EDN Magazine Hot 100
• MathSoft OEM since 2000
• TI Partner since 2000
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Visual Solutions
Markets & Major Accounts
Aerospace
Motion Control
Power & Gas
Allied-Signal
General Dynamics
GEC Alsthom
BF Goodrich Aerospace
Boeing
British Aerospace
Cessna
Eglin AFB
Kollsman
Litton
Lockheed-Martin
NASA
Northrop-Grumman
Pratt & Whitney
Textron
Allen Bradley
Danaher Motion
Maxon Motor AG
General Electric Drives
EPH Elektronik GmbH
Indramat
Instron Corporation
Copley Controls
Kollmorgen
Parker Hannifin
Universal Instruments
Spectra Physics
Vickers
Pacific Scientific
Heinzinger electronic GmbH
British Gas
Arizona P&G
Florida Light & Power
Hitachi Power
Manitoba Power
Ontario Hydro
Pacific Gas & Electric
Three Mile Island
Stanwell Coal Gen
Tenneco Gas
TVA
Union Electric
Virginia Power
Kestrel Power
Dong Energy
Visual Solutions
Markets & Major Accounts
Industry
Process Control
Transportation
ABB-Instrumentation
Allen Bradley
Carrier Corporation
Corning
Fuji Electronics
General Electric
3M
Honeywell
Hughes
IBM
Johnson Controls
Motorola
Raytheon
TRW
Toshiba
United TechnologiesPotlatch
Westinghouse
Alcan Rolled Products
Amoco
Bethlehem Steel
Bayer
BP Chemical
Champion International
Dow Chemical
DuPont
Foxboro
General Mills
Georgia Pacific
International Paper
Kaiser Aluminum
Mead Paper
Mobil Chemical
ABB
Bombardier
British Rail
Chrysler
Eaton
Ford
GM
Honda R & D
Mazda
Volvo
Weyerhaeuser
VisSim at ResMed
ResMed uses VisSim in all phases of product
development for CPAP human respiratory aid
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Models of controller
High fidelity models of human variation and pathology
Run pure simulations to tune controllers
Use VisSim/C-code to develop embedded system to run
various virtual patients to test against final product
- Use VisSim/Viewer to distribute VisSim simulation of
CPAP and human for pre and post sales training
VSI Relationships
• Mathsoft bundled VisSim/PE and LE low end
VisSim products.
• TI Third-Party partner. VisSim/ECD link is
included in C2000 kits.
• IBM (Telelogic) resells VisSim as “Continuous
Modeler”. Tight co-simulation coupling with
Statemate.
VisSim
• Visual block diagram software for dynamic simulation
and model-based embedded development.
– Automatic production of high quality fixed point code
– Exceptional dynamic and Hardware-in-loop simulation
capabilities
– Automatic programming of on-chip MCU peripherals
– Intuitive, easy-to-use graphical user interface
– Fast sample rates (> 500 kHz)
– Low memory foot print (1.5k flash 200 bytes RAM)
– Affordable
More Advantages…
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Royalty Free Redistributable Viewer
– Allows you to send VisSim models to anyone. Models can be run but not
altered.
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Ease of use gives faster training, faster reuse of old projects.
Fast interpretive execution gives quick feedback on designs
Built-in C interpreter gives industry standard text based language
– Allows specification of same .c init file in simulation as codegen target
– Allows efficient code generation for state transition block: transition events
appear in generated code exactly as they are entered.
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Efficient code generation
– Tight fixed point code
– Usage of same variable names as in VisSim
Product Line
• VisSim Core Visual Simulation Tool
– Interactively build, simulate and debug nonlinear
models
– Simulink Translator
– State Transition block
– Over 200 built-in blocks
– Built-in C interpreter
– Matlab interface
– Royalty free redistributable Viewer
VisSim Add-ons
• Real-Time - Allows up to 30 kHz closed loop
sampling from VisSim on PC
• C-Code - Generates ANSI C from diagram
• Analyze - Frequency domain analysis of
linearized non-linear subsystem
• Fixed-point - Block set of bit true scaled
integer operations for simulation and code
generation
VisSim Add-ons
• Comm - Physical layer data communication
• Optimize Pro - Generalized Reduced Gradient
method of parameter optimization
• Neural nets - Neural network construction and
training package
• Texas Instruments MSP430 (F1x, F2x, F4x,
F5x) and C2000 (LF240x, F281x, F280x,
F2802x/3x(Piccolo), F2833x (Delfino), C6713
VisSim Add-ons
• Motion Block Set - Preconstructed block set for
motion control
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Includes AC Induction
Brush and brushless DC
Stepper motors
Controllers
Rotational and translational loads.
Some VisSim Examples
• Simple damped harmonic – basic linear
differential equation
• Lorenz attractor – basic nonlinear diff. eq.
• Interactive power spectral density
• System ID
• PID tuning
• Embedded Mathcad worksheet
VisSim/Real-Time
• Supports National Instruments and
Measurement Computing boards
• Analog, digital, thermocouple, counter, PWM,
encoder
• 30 kHz close loop sampling straight from
Windows/NT,2000, XP
• Just place block and select “Run in Real-Time”
from Simulations Properties dialog.
VisSim Plays Well with Others
• OLE interface- allows inclusion of any OLE
compliant software
– VisSim - Mathcad OLE interface allows graphics
plus data exchange
• VisSim - Matlab Integration allows matrix data
exchange and Matlab expression evaluation
• Simulink Translator brings Simulink diagrams
into VisSim workspace.
VisSim Custom Block API
• MSVC Wizard creates project for
custom block. Just drop in code.
• API allows:
– Menu positioning
– Block & connector naming and data typing
– Code generation
– Simulation info on integration method,
integration step, time step, current time
etc.
VisSim Viewer
• Free redistributable run-time version of VisSim
• Allows licensed users to freely distribute
models to those who do not have VisSim
development licenses
• Easy way to share ideas, models and
simulations
• Supply proof-of-concept simulations to
potential customers
VisSim/Embedded Controls
Developer
• Bundle of VisSim, C-Code, C2000 target, TI
DMC block-set , fixed-point block set, TI Code
Composer Studio plug-in
• Supports F280x,F282x, F283x on-chip
peripherals: ADC, ePWM, eCAN,
QEP(encoder), event capture, UART, SPI,
GPIO, I2C, interrupts, watch dog
• VisSim/Motion motor simulator add-on
The VisSim RTOS
• VisSim provides a simple RTOS environment
– Main low jitter (submicrosecond) control thread runs at
time step as set in diagram “Simulation Properties…”
– Unlimited number of preemptable (high jitter) background
threads – (option in Compound block)
• Jitter = variation in actual time step from specification
– Schedule synchronous tasks from main thread
– Efficient device drivers for on-chip peripherals
– Handle interrupts directly in VisSim (option in Compound
block)
– Interrupt based soft queued I/O for serial, SPI and I2C
The Code gen Dialog
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From Tools > Code gen…
Result file
Select Target
– Device below on right
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Include Compound names as comments
On-Chip RAM (no external RAM)
Target Flash (put code in flash memory)
Minimize RAM Usage (uses no numerical integration)
Make Callable from User App (generate 2 functions, init and rate,
to be called from custom application or RTOS)
Include VisSim Communication Inteface (add PC communcation task to
target. Boot waits for PC handshake before starting controller)
Simulate Control Subsystems
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Minimize time spent in debug and test
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Use high-level, predebugged blocks
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Support simulation of
controller at block level on
PC
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Allow mouse probe of every
input and output to display
values at any instant
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Debug block-level simulation
on PC
Digital control of DC-DC Buck
Converter
• Uses PID controlled PWM power modulation
to maintain ADC sensed output voltage
• Control setpoint through VisSim GUI
• Interactive plot of controller contributions, setpoint, and output
• 8 parallel converters run at 300 kHz sample
rate
Hardware-in-the-Loop
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Control runs on MCU, background monitor talks to PC over JTAG in background task
* Code automatically generated, compiled, linked, and
downloaded
VisSim on PC
MCU I/O
Plant
Under
Control
(PWM,GPIO,
C2000
Analog, CAN,
Peripherals
encoder)
Control
Application
Code*
C2000
MCU
JTAG
JTAG
VisSim Interface block
downloads and monitors
code running on target
VisSim blocks for:
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Virtual plant
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Interactive gains
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Plots of target response
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JTAG in Real-Time Monitor mode allows interactive controller gain changes and plot of results
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Rapid, diagram level, edit-compile-download-debug cycle (under 10 secs)
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Test, debug, and validate the on-MCU control from VisSim using a targetInterface block
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Calibrate controller gains on embedded target easily with VisSim interface
Codegen for 8 DC-DC Buck
Converters
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Uses 2.3K words flash
Uses 171 words RAM
Uses 80% of processor at 300KHz operation
Has 100 Hz background task to read
temperature sensor on ADC line, and send
status to LED bank via SPI
• Code uses inline read/write of I/O registers
• Retains VisSim variables as C variables
VisSim/ECD Benefits
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Automatic code generation plus peripheral
support results in quicker design time, fewer
design iterations and faster time to market
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Easy debug with JTAG HotLink + CPU
Utilization feature means confidence that the
resulting product meets design specifications
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Self-documenting block diagrams make
intellectual property easier to reuse
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Embedded Target Support
• Texas Instruments
– MSP430 (F10xx, F2xx, F4xx, F5xx)
– C2000 (LF2407, F2812, F280x, F2802x/3x/6x(Piccolo),
F2833x (Defino), Concerto in development
– C6713
• QNX x86
• Emulators and development boards from:
TI, Spectrum Digital, Softbaugh, Olimex
– XDS510, XDS100 (low cost), Blackhawk, Signum JTAGjet
TI Digital Motor Control Library
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Core was written, tested and optimized by TI
Available in VisSim/ECD as easy-to-use block set
Block set coded in C++ to VisSim User Block API
Supports simulation mode (pure PC based
simulation with 16-bit truncation effects)
– Supports code generation mode
Conclusion
• VisSim/Embedded Controls Developer is a valuable
tool to accelerate embedded development
• VisSim/ECD speeds embedded design of:
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Fixed-point operations
On-chip peripheral usage
Motion control
Industrial closed-loop control
Digital power systems
Next Step
• Visit www.vissim.com/piccolo
And download a trial copy of VisSim/Embedded
Controls Developer for TI C2000
Advantages vs Simulink
• Cost for Embedded MCU Development
– $10,000 for VisSim
– $4,800(matlab&simulink)+7,500 RTW+Embedded
Coder 5,000 + JTAG target link $2,000 +
FixedPoint $2,000 + DSP blocks $1,000 +
stateFlow $2,800 + stateFlow Coder = $25,000
• Network floating license
– VisSim = 2x = $20,000 (worldwide $20,000)
– Simulink = 4x = $100,000 (worldwide $300,000)