An introduction to: The uRT51 Microprocessor and Real-Time Programming Suite. [email protected].
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Transcript of An introduction to: The uRT51 Microprocessor and Real-Time Programming Suite. [email protected].
Real-Time Systems: an overview.
Real-Time Systems are used in many applications areas (not just critical ones but those where timely behaviour is either required or convenient).
Real-Time Operating Systems (RTOS) are applied in order to get a desired performance of the real-time system.
How traditional real-time systems are implemented.
A set of tasks are defined and parameterised as real-time tasks.
A RTOS’s task, call “the scheduler”, is invoked at regular intervals (the scheduler is usually implemented as an ISR of a timer interrupt).
The timer interval defines slot time units. The scheduler chooses a task according to a priority
discipline and grants it the processor.
Implementing a Traditional Real-Time System.
We have to choose an adequate time interval– IT IS NOT SO EASY AND PERFORMANCE, AS WELL AS
POWER CONSUPTION, MAY DEPEND ON IT (SCHEDULING OVERHEAD vs. TIME PRECISION).
We must express time parameters of the tasks in slot units.
– IT MAY FORCE US TO MODIFY THE TASK CODE (Example: IF THE SLOT TIME IS EQUAL TO 4ms AND THE TASK CALCULATES SOME VELOCITY, IT IS NOT THE SAME A PERIOD EQUAL TO 12ms OR EQUAL TO 16ms.
Current solutions (what to do when system doesn’t work): When application constraints are not met, the following
options are evaluated:– To increase the microprocessor frequency. Temporal
constraints can be satisfied but power-consumption as well as cost are also increased.
– To implement power-saving algorithms: these algorithms may introduce some perturbations on the other tasks of the systems and requires some power to be executed.
– To implement a low complexity scheduler. The real-time performance of the system is affected.
– To program the whole application as a monolithic program. Maintenance of the system is complex and expensive.
TRADITIONAL REAL-TIME SYSTEMS DO NOT GIVE GOOD SOLUTIONS FOR EMBEDDED APPLICATIONS
uRT51 main features.
uRT51 is a Real-Time microprocessor designed for Real-Time applications.
It can implement a great deal of scheduling disciplines.
It includes a built-in debugging. It supports up to 65000 tasks. uRT51 performance with a 10Mhz clock is
higher than performance achieved by a RTOS with a 100Mhz clock.
uRT51: implementation.
It was entirely described in VHDL.
It can be implemented either on FPGAs or ASICs.
uRT51: an overview.
Instruction subset compatible with 8051 microprocessor.
With a 10MHz clock, time parameters can be expressed with a 100ns precision (one clock period).
If no real-time task is required to be executed, then the power consumption is almost zero (no power reduction strategy is needed).
uRT51: The architecture
The uRT51 architecture contains:– A 8051 microprocessor core (further uP versions will
considered other microprocessor cores).– A real-time unit that carries out all the real-time
functions.– A debugging and analysis unit that connects to uRT51
Real-Time Programming Suite.
uRT51: Applications
The uRT51’s flexibility improves a wide range of applications where Real-Time is applied.
uRT51 is suitable for low-power, control embedded applications.
uRT51 Real-Time Suite
uRT51 Real-Time Suite brings you all the power to program and analyse the uRT51 microprocessor.
Suite: the task progr. Environment
Task Code
Just functionality, no real-time programmingReal-Time
properties configuration
Add as many tasks as you need
Would you like to change the Scheduling
Mechanism?
Suite: the scheduling
Choose your scheduling discipline
Additional disciplines can be included under
request
Suite: independent preemption
You can select preemptive or non-preemptive
behaviour for each task
Do not worry for time units of your design
Suite: let’s compile
Compile your application with
just one click
Detail messages allow you an easy
debug
Suite: connecting to the uRT51
Open the Control Console to connect
to the uRT51
You can see the state of the connection with the the uRT51 Microprocessor
Suite: Control Console functions
Connect to the uRT51
Download your application
Trace your application
Reset the uRT51
Record Runtime Data for Real-Time analysis
Suite: Variable Viewer
Follow the value of each one of your variables Store the values for further analysis.
Suite: Scheduling Viewer
Analyse the way your tasks are executed. Runtime execution time is trustily shown.
Conclusion
uRT51 is a flexible Real-Time microprocessor. uRT51 Real-Time Suite allows you to program
and analyse real-time applications in a few minutes.
Because uRT51 is described in VHDL, it can be used in System-On-Chip architectures.
Conclusion
Very precisely timing can be achieved (100ns of precision with system clock of 10MHz instead of some ms of system timer tick).
No power consumption algorithm required (power consumption almost zero when no task is executed).
Any arbitrary priority discipline can be implemented (it may be included in the Programming Suite under request).
Conclusion
uRT51 microprocessor is suitable for low-power embedded real-time control applications.
Thanks
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