Sonsivri

Nowadays i want to work on RTOS. Lots of people suggest OSA RTOS. I read instruduction and examples but i didnt built one program yet.
Can you help me in these questions?

First, where will unrar to RTOS files?
Second, i'm using C18, do you send me one example?
Third, i prefer MPLAB X, but i also use MPLAB old version.

I use 18F2520

Thanks..

Just open and compile the example files that come in the OSA RTOS download. Every one I have tried compiled without error, and the few that I have tried in hardware worked as documented.

Once you have one of their examples working, you can start modifying it for your own desires.

I know that but, can you show me my questions' answers step by step??
Because i dont understand where do i unrar the files?
I always get an error. I cant try example because of that.

Solved!

http://www.youtube.com/watch?v=5Y9nkQ1x0yI

Dear devfirat,

could you please upload your source code?

best regards, sughoi

You can look at here: http://www.fxdev.org/rtosa-giris-osa-rtos/

You can translate it to English.

Dear devfirat

Thank you very much for the article. I will use OSA instead of FreeRTOS. By the way Turkish is OK no need to translate in to English.

best regards, sughoi

Everyone, works with RTOS, tells me to use FreeRTOS.
I'm new at this but i can tell OSA is good for beginning. ;)

Dear devfirat

I'm also new in RTOS field and I know that the worse thing at RTOSs is configurations. It takes a lot of time but once you understand it, it becomes so east to use.

Best regards, sughoi

I'm confusing about using small delay.
If I want 30us delay, or something like that. What should I do about it?

I always use ADC or LCD and like that. And I must always use delay function.

Can I combine this delay functions with RTOS?

I know about RTOS tick and how to use it. I dont mean that.

It is also a problem for me. If you ask my opinion may be you can prefer CCS compiler and its RTOS. Also you can find a book that gives a few clear example of CCS RTOS. The book is below;

Dogan Ibrahim - Advanced PIC Microcontroller Projects in C: From USB to RTOS with the PIC 18F Series

http://www.4shared.com/document/OZyhKrds/Advanced_PIC_Microcontroller_P.htm?aff=7637829

Best Regards, sughoi

I don't like and prefer his books. Thanks by the way.

Some people tells me use C++ if you want to work on RTOS professionally.

dear, devfirat

If you want to choose C++ than go ahead. but I know that small size microcontrollers are a good target for C++. so it seems to me that you want to focus on powerful processors.

Anyway, please inform time to time. Also it can be a good work of study for me.

best regards, sughoi

I use a 18F97J60 running at 40MHz. I'm experimenting with Pragmatec PIC18OS (open source) and the latency time is 50us but interrupt time is 1 ms, managed by an internal RTC.
You can use these defines:
/* MAGIC : Tmr0.lt = 65536 - (CPU_FREQUENCY_HZ/4/1000 - 232)          */
#define _10MHZ   63320
#define _16MHZ   61768
#define _20MHZ   60768
#define _32MHZ   57768
#define _40MHZ    55768
It should be placed in Yr Interrupt.c file (if You have any!)
Have a look in Yr. datasheet for INTCONbits.TMR0IF or whatever it's called for Yr. PIC. There you also have alternative timer settings

Try it...

This RTOS works very good with Atmel AVR microcontrollers ;)