scheduler for Atmel 89c52

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kannan

Joined: 21 Feb 2005
Posts: 11

16 May 2005 7:13 rtos 89c52

Hi ,

If anyone developed scheduler for Atmel 89c52 microcontroller pls
provide me the source code in either C or Assembly.
my mymail id kannan_emb(at)yahoo.com

Thanks
G kannan

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16 May 2005 7:13 Ads

dom

Joined: 26 Apr 2004
Posts: 17

29 May 2005 0:51 atmel scheduler

ucos-ii is a rtos.
www.ucos-ii.com

opentdoors

Joined: 15 Jan 2005
Posts: 12
Location: Viet Nam

29 May 2005 11:48 ucos-ii periodic sporadic

I think uCos-ii not really a rtos. Just a multitasking system.

A rtos is a round-robin/ preemptive task scheduler. Tasks has higher priority is scheduled to round-robin switching and next round-robin circle for lower priority tasks.

A simple rtos is a round-robin scheduler.

There are two type of tasks in rtos: periodic and sporadic. Periodic is switched every real-time clock, and sporadic is switched when a event (interrupt) occured.

In a rtos, there is a single-list called run queue, that is a single-list sorted follow task's priority. When a task come to suspend, it's drop from runqueue to wait queue....

In a true rtos, time-tisk controlled from a realtime clock (Freq=32,768KHz) for task.