VisSim/Embedded Controls Developer
 VisSim/Embedded
Controls Developer (VisSim/ECD) is an environment for model-based development
of embedded control systems. Using a block diagram approach, you can
quickly create a working model of your control system; it can be as simple
as a PID control or as complex as a multi-phase vector controller with
packet-based RS485 protocol and dynamic IIC EEPROM read/write. With your
model in diagram form, you simulate and generate code. In simulation
mode, it is fast and easy to prototype, optimize, and debug before you
ever generate code. Once you are happy with simulated performance, just
click the Compile button to generate highly efficient C code and compile
it to a target executable. The VisSim target HotLink lets you download
and interactively debug your algorithm while it runs on the target.
VisSim/ECD is unique in its ability to generate highly efficient, high
sample rate, low jitter target executables. For example, a closed-loop
PID control with encoder input and PWM output and one digital output
line take 1.1K flash and 100 bytes RAM on the MSP430, and VisSim/ECD
generated code can sample at rates over 1 MHz on the F28335. As a TI
3rd party partner, Visual Solutions has gained valuable access to TI
technology to tune VisSim/ECD to make best use of TI processors and peripherals.
Benefits
Use of a high level model-based programming tool like VisSim/ECD offers
many benefits:
- Removes the requirement for one or more dedicated programmers
- Speeds
the edit-debug cycle
- Lets you think and program at a much higher level
of abstraction
- Speeds implementation of on-chip peripheral drivers by
providing a simple block and configuration dialog interface
But perhaps the biggest advantage is the increase in consistency and
reliability that VisSim/ECD brings to the finished product. Because the
generated code is done automatically, VisSim/ECD uses a smaller set of
C language features to implement an algorithm, as well as generating
syntactically and semantically correct C code. With hand coding, any
number of small programming errors like a misplaced curly brace, function
argument mismatch, unexpected expression evaluation order, or just a
misplaced semicolon can result in small, hard to find errors. By automatically
generating a well-tested C code subset, these common coding problems
are gone. In addition, the chief architect of the VisSim code generator
served on the ANSI C committee from the first meeting to the last, and
authored a book on the C language, so he knows the best way to use C
to get reliable, efficient performance.
VisSim diagram to drive 20kHz switched 3-phase PWM at 60Hz
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Features
- VisSim/Fixed Point block set performs simulation and efficient
code generation of scaled fixed-point operations like sin, cos, sqrt,
atan2, FIR, and IIR; overflow and precision loss effects are easily
seen and corrected at simulation time; auto-scaling speeds fixed-point
development; in-line code generation creates fast target code
- Peripheral
blocks to generate code for C2000 on-chip devices: 280x ePWM, eQEP,
eCAP, ADC, GPIO, quadrature encoder, event capture, CAN 2.0, SCI(RS232,UART,serial
port), SPI, McBSP, watchdog, and interrupts
- Full control of PWM including
dynamic control of PWM period and phase, ADC start of conversion, trip
zone, deadband intervals, action selection
- Interrupt-based queue drivers
for serial(SCI), SPI, and McBSP; user selectable queue lengths and
use of hardware FIFO result in lower system overhead
- Diagram-based interrupt
handlers for XINT, ADC, PWM, and DMA
- Easy creation of background tasks
Subsystem dialog box to create a background task that runs at a user
specified rate
- TI C2000 Digital Motor Control (DMC) block set supports
simulation and code generation of efficient, fixed-point routines for
Park and Clarke transforms, rotor speed and flux estimation, PID control,
space vector wave form generation for AC Induction and brushless DC
motor control
- Automatic C code generation of production quality fixed-point
code, compile, link, and JTAG download.
- Supported processors include:
TI MSP430 (all flavors), C2000 (all flavors) including F2808 and variations,
F28027, F28035 (Piccolo), F28335(Delfino), LF2407, F2812, C5510, C6713,
Intel x86 PC
- Retention of the VisSim GUI while algorithm executes on
DSP lets you visualize interactive plots of DSP outputs and change
DSP gains and parameters in real time
- VisSim Code Composer Studio (CCS)
plug-in for automatic CCS project creation
- TI C2000 CAN bus support
- Serial-port-based LCD display support
- Efficient 7- and 14-segment
LCD display support for MSP430; user table can customize segment assignments;
auto conversion from scaled fixed-point to decimal display uses no
floating point and no divide for maximum efficiency on MSP architecture
- Flash
Burn support tracks processor speed and PLL multiple to safely burn
your standalone controller to Flash
- Conditional execution of subsystems based on any Boolean condition,
including occurrence of interrupt
- User control of execution order of parallel flows is done top down;
subsystem contents are completely executed before the next block on
given layer, which provides fine grain control necessary for hardware
device access
- State transition block provides unlimited states and transition conditions.
Transition conditions are C expressions.
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