To begin Rtos with keil

I write codes for Microcontrollers where always three-four different task have to be handled for their occurance so that
appropriate action can be taken.
so i want to look,what if code is in real time ie RTOS where task scheduling,handling is possible,thus decreasing over head for future,as tasks to be handled are going on increasing.

You have not specified a toolset, what is it ?

three-four different task have to be handled for their occurance so that
appropriate action can be taken.
That is called interrupt handling.

RTOS where task scheduling,handling is possible,thus decreasing over head for future
a RTOS INCREASES not decreases the overhead.

Erik

Toolset ->Cx51 and 8051 development Tools
i have to keep polling,looking for occurance of a particular task,if a task is missed it won't cause major problem,but only degrade system performance,sometimes projects are such that task have particular sequence ie
a task cannot occur before other or sometimes two task have to be run parallel
eg one task uses timer while other look for port pin signal while other other take care of reading RTC(real time clock),in reality task cannot run simultaneously.For taking care of all this i have to code accordingly.i have keil compiler for coding microcontroller,this compiler also have its rtos for microcontrollers and i want to use it.so need help to begin with.

I think we have some different interpretations of overhead here.
When Arjun says "less overhead", he is talking about how much code he has to write himself.
When Erik says "more overhead", he means that the processor has to do more work.
Both are correct within their own interpretation of "overhead".

Richard is exactly right.
Have any body used rtx tiny ?

still no reponse!

Sorry Arjun, I haven't used RTX Tiny.

Stefan

I used RTX Tiny for a C167 project.
First read the manual about RTX and RTX Tiny.
RTX Tiny uses "round robin tasking".
Start with the example project measure.

i am going through manuals and code along with it,i would return back if i have doubt related to it.
Thanks Ulf Sab

Hi
going through the manuals given for RTX Tiny i found manuals too .....
can any body provide me with quick reference for RTOS basics and its implementation with Keil RTX Tiny Compiler ?
(so that i can give some more time to on going projects)

Thanks

i have begined with rtos,

can anybody guide me for following

1)how about initialising the system
for eg port settings,baud rate,timer
initialising,
I cannot define initialisation in task,
as each task this task switches it will
go for reinitialising already
initialised system ?
2)how interrupts will be taken care ?
will the interrupts becomes task
specific ?
3)I am using timer 1 for baud rate and
timer 0 for some other application,on which
timer rtx tiny works ?
4)can system setting be changed each time
as tasks changes(ie each task can have its
unique setting) ?if yes how ?
will this continuous change of setting
affect CPU performance in long run ?
Regards

No body has reply to above questions ?

I'm using RTX tiny for C166. For C166 information about RTX/RTX tiny are in the the Assembler Manual. See the simple rtx examples, then the "traffic"-example and make some experiments. For RTX tiny 166 the answers are:
1)
The first task (task 0) should initialise the system. Create the other tasks. Then terminate task 0 with the os_delete_task(0) command.
2)
The task switch interrupt has the lowest priority, so the other interrupts will stop task switching.
3)
You will find this in the asm-manual. It is possible to change the rtx-timer if need to do.
4)
I don't think that this is possible. What settigs do you want to change?
In RTX tiny (round robin!) task switches occur after a predefined time. After a short time the program execution continues at this point.

Ulf

Thanks Ulf,this reply will help me,but i have other doubts too.Will talk later.