limited ROM and RAM, Salvo™ is the solution for harnessing the power, speed and flexibility of an RTOS in low-cost embedded designs.

 

 
 

As the first full-featured RTOS capable of running on Microchipฎ PICฎs and other microcontrollers with aaaaa       aaa
 

Features

• Designed to run on processors with severely limited RAM (e.g. < 250 bytes)

 

• No PUSH/POP stack or stack pointer required

 

• Works within a hardware call...return stack of 8 levels or less (4 is typical)

 

• Extremely small RAM and ROM footprints

 

• Cooperative, event-driven, priority-based multitasking

 

• 16 separate dynamic task priority levels

 

• Number of tasks and events limited only by available memory

 

• Intertask communications and synchronization

 

• ISR-to-task communications and resource sharing

 

• Event support includes semaphores, messages and message queues

• Fast context switching

 

• Low interrupt latency

 

• Requires only a single interrupt to support optional time-based services (e.g. delays, waiting with timeouts and elapsed time)

 

• Task delays can be specified in 8-, 16- or 32-bit system ticks, with optional linear prescalar for system timer routine

 

• Tasks at equal priorities will round-robin

 

• Highly configurable via C preprocessor to fit your application

 

• Full source code included

 

• ROMable and extensible

 

• Portable – written almost entirely in C, with minimal compiler- and target-specific assembly coding.

 

• Very easy to use – employs standardized multitasking methods and terminology

Status

•  Fully supports Microchipฎ PIC12-, PIC16-, PIC17- and PIC18-family PICmicroฎ MCUs. Supported compilers and their targets include HI-TECH PIC C (PICฎ), Metrowerksฎ CodeWarriorฎ (x86) and Mix PowerC (x86). Support for additional processor families and compilers is ongoing.

 

•  A full-featured Microchipฎ PIC16C77 demonstration program consisting of 8 concurrent tasks with delays, waiting with timeouts for events, a predefined idle task, 5 counting semaphores and run-time statistics (number of context switches, etc.) was created in under 1 hour. Kernel memory usage for this particular application: 86 bytes of RAM and approximately 1K instructions in ROM. Simpler applications may require substantially less RAM and ROM.

 

 

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