RTOS for CCS

haxan7 · Joined: 27 Jul 2013 Posts: 79

I am looking for RTOS that supports PIC24 and/or PIC32 on CCS compiler.
OSA has been ported for CCS but only works for PIC16 and PIC18.
Any suggestions?

Edit:
One major reason I want to use RTOS is to establish user interface.

temtronic · Posted: Wed May 21, 2014 4:54 am

Option #1 .Write your own. Really it's not that hard to do,depending on WHAT you expect an RTOS is and the features you will be using.

RTOS is really a meaningless term to me.You need to detail the features and functions necessary for your application.

If this is a 'one off' project cutting RTOS code isn't viable, but if for a product of 1,000s then spend the time and cut code.

I'll lay odds 99.9% of the PIC projects and products developed using CCS C in this forum do not use the RTOS.

Option #2. Rethink your project code.CCS provides great functions to timers,bit functions,I/O, etc. making coding 'fun'.

hth
jay

ckielstra · Joined: 18 Mar 2004 Posts: 3680 Location: The Netherlands

Of course there is the RTOS supplied together with the CCS compiler...
Then there are several other OS-es out there for use on the PIC24 PIC32 but I don't know if these are supported by the CCS compiler. Problem is that most implementations require compiler support for re-entrant functions and that is something CCS doesn't have (advantage is that many CCS programs can be smaller).

Then, why do you want an RTOS? What problems do you think it will solve for you?
My understanding is that many people say they want an RTOS but have no idea of the limitations of most RTOS-es. Often the problem can be tackled without RTOS; use a timer interrupt and a separate state machine for each 'task' and you are up and running in no time without the hidden RTOS problems.

haxan7 · Joined: 27 Jul 2013 Posts: 79

Jerson · Joined: 31 Jul 2009 Posts: 125 Location: Bombay, India

Ttelmah · Joined: 11 Mar 2010 Posts: 19447

Key thing to remember is that whatever approach you use, the individual tasks, have to be short. You can't have 'main routine' code, interrupting other 'main routine' code. The CCS supplied RTOS, or any other approach, functions like the old W95 multi-tasking, with new things only being scheduled when a routine exits. Provided you keep this in mind, the supplied RTOS can do what you want, but a simple tick interrupt , can do it just as well, and gives you more precise control over the timing, together with more flexibility.

Best Wishes