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nanoos's Introduction

NanoOS

This is an ultra-lightweight operating sysytem featuring a simple task and scheduler. The initial release of this OS is to support microprocessors and minimum RAM. The scheduler is designed for millisecond operations. If sub-millisecond operation is needed, then it is best handled by low-level timing code. (for example bit-banging i/o at >1K).

Primary Features

Task

A basic association of a method and the links needed to use it on a delta queue.
Two types of Tasks are provided for:

  • static void Functions (stores the function reference).
  • class methods (requires the storage of the instance and the method reference).

Scheduler

Provides the basic loop implementation and runs the tasks based on a schedule.

  • schedule(task,timeMilliSeconds)
  • cancel(task)
  • ready(task, time=0) (makes it ready, normally in interrupt, will be picked up by scheduler)

Operation

The basic operation is:

  • Create Tasks
  • Schedule Tasks (if any)
  • Interrupts - make Tasks Ready.

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