> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of Isaac Marino Bavaresco
> Sent: 23 May 2009 01:03
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] RTOS like this?
> 
> 
> This is my proof of concept for a preemptive scheduler for PIC16 MCUs.
> Not quite working, but shows the concept (in MPLB-SIM).
> 
> Sometimes one task gets "lost",  but the others keep taking rounds. I
> think I will need to rewrite the scheduler (interrupt routine) in
> assembly for it to work correctly.
> 
> The context is not saved/restored correctly yet (STATUS, FSR, etc.),
> only the PC.

Sorry to be a bit negative, but this only works as well as it does
because your tasks are so simple.  You are saving the return address at
just one point in your task, yet the scheduler could interrupt it
anywhere.  Even if you added context saving this would never work
correctly with tasks that compiler to more than a couple of
instructions.

Regards

Mike

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