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Is it possible to communicate between PIC16F877A and PIC16F84A .. ? Is RS232 communication possible ... ? I want to drive the stepper motor with PIC16F84A .. and send the data back to F877A ... the F ...

Software solution, is to use one of the timers.
In the INT_RB routine, program this to trigger in perhaps 1mSec, enable this interrupt, disable int_rb, and exit the routine.
Then have an interrupt h ...

I can't call a delay_ms() in isr... right ?? Can I call a function which will in turn call a delay ?? ... How can I exit from an isr without executing the later part of the code in isr... ? Your solut ...

Well, you set the B4 to B7 pins to inputs, and you enable interrupts, so you should enter the routine. Did you try, as I said, to do something more simple ? Something like that :
long test=0 ;

#in ...

Basically it works but not properly....though RB4 RB5 works fine but RB6 and RB7 give ambiguous results

Thanks .. I really overlooked it ...but the interrupt is still not working

I am trying to make an obstacle avoidance robo, using stepper (unipolar) motor ,,, and IR for the detection...I have connected the output of and LM324 (opamp) to the interrupt pins... the IR receiver ...

connect the 1uf in MAX232 properly... ie the + and - sign of the capacitors...this may be the only problem...I think...

great work ...

ok, I understand that .. but what is the need of setting the value of "max" then ?.... why does the RTOS need it... are they fooling us ?

Changing to a 16 bit timer is not enough to solve the problem, your 500ms setting still generates a timer overflow with the same compiler error.
When I changed the #rtos line to the one below I g ...

I have a new problem now ... is this RTOS seriously lame .... ? If anyone have written a program within an infinite loop a little trickily then this RTOS features can be easily implemented without RTO ...

Try using Timer1 or add a prescaler to Timer0. I think the timing duration of 1000ms using a 20MHz clock un-scaled is beyond the 8-bits available with Timer0. Timer1 is a 16 bit timer.

#use rtos(ti ...

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//// ex_rtos_demo1_tasks.C ////
//// ...

No one to help me out ?? Please try ...