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发表于 2007-8-7 10:01:32
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IAR PowerPac RTOS
IAR PowerPac RTOS is a priority controlled real-time operating system, designed to be used as the foundation for development of embedded real-time applications. It is optimized for minimum memory consumption in both RAM and ROM, as well as high speed and versatility.
The kernel of IAR PowerPac RTOS is fully interruptible and can be used in time critical situations. Despite its size and efficiency, IAR PowerPac RTOS features the entire range of communication mechanisms such as mailboxes, events and different kinds of semaphores. All tasks and communication instances can be dynamically created, deleted and configured, and the priorities can be fully controlled.
Key features
？ Preemptive scheduling
？ Round-robin scheduling for tasks with identical priorities
？ Preemptions can be disabled for entire tasks or for sections of a program
？ No configuration needed
？ Up to 255 priorities
？ Unlimited number of tasks, semaphores, mailboxes and software timers (limited by available memory only)
？ Unlimited number of software timers with freely selected time resolution
？ Full interrupt support; most API functions can be used from within the Interrupt Service Routines (ISRs)
？ Zero interrupt latency time
？ Nested interrupts permitted
？ Task switches even in interrupt handlers
？ Very fast context switch times
？ Easy-to-start applications and projects
？ Small memory footprint
？ Core written in assembly language
？ All API functions callable from C, C++ and assembly language
Memory usage in IAR Embedded Workbench for ARM
Kernel size (ROM) approx. 3000 bytes
Kernel RAM usage 51 bytes
RAM usage per task control block 32 bytes
RAM usage per resource semaphore 8 bytes
RAM usage per counting semaphore 2 bytes
RAM usage per mailbox 20 bytes
RAM usage per software timer 20 bytes
RAM usage per event 0 bytes
Minimum stack size per task (RAM) 56 bytes |
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发表于 2007-8-6 21:18:44
