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Rtos task rate and minor_cycle relationship

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Onur

Joined: 11 Apr 2004
Posts: 11

Rtos task rate and minor_cycle relationship

Posted: Mon Aug 10, 2009 3:53 am

Hello I want to ask about Rtos

this is main Rtos parameters

Code:

#use rtos(timer=0,minor_cycle=1ms)

My tasks are

Code:

#task(rate=1s,max=1ms)
void The_first_rtos_task ( );

#task(rate=1s,max=1ms)
void The_second_rtos_task ( );

#task(rate=500ms,max=1ms)
void The_third_rtos_task ( );

#task(rate=500ms,max=1ms)
void The_fourth_rtos_task ( );

#task(rate=250ms,max=1ms)
void The_fifth_rtos_task ( );

#task(rate=250ms,max=1ms)
void The_sixth_rtos_task ( );

#task(rate=125ms,max=1ms)
void The_seventh_rtos_task ( );

#task(rate=125ms,max=1ms)
void The_eighth_rtos_task ( );

#task(rate=65ms,max=1ms)
void The_nineth_rtos_task ( );

#task(rate=65ms,max=1ms)
void The_tenth_rtos_task ( );

#task(rate=4ms,max=1ms)
void The_eleventh_rtos_task ( );

inside of task

Code:

void The_first_rtos_task ( )
{
if (flag==0){
flag=1;
rtos_disable(The_second_rtos_task);
}else{
rtos_enable(The_second_rtos_task);
flag=0;
}

void The_second_rtos_task ( )
{
output_toggle(LED1);
}

other tasks are similar just timings are different.

the problem is

Code:

#task(rate=1s,max=1ms)
#task(rate=500ms,max=1ms)

this two tasks doesnt start from begining. what im doing is just flashing leds.

after I reset pic those two task doesnt start. maybe it tooks about 7sec to start.

if I use minor_cycle grater than 4or 5ms every thing is ok. the thing is I will add lots of task and I want to use faster minor.

Im not use but maybe minor_cycle uses 1byte varible or
rate uses 1byte varible

so when minor_cycle = 1ms if task rate=500 then multiply result grater than 1 byte.

What do you think?

Thank you for reading.

Last edited by Onur on Mon Aug 10, 2009 7:55 am; edited 1 time in total

Onur

Joined: 11 Apr 2004
Posts: 11

Im just guessing

Posted: Mon Aug 10, 2009 7:54 am

I guess

Task rate /minor_cycle =should be less then 255 (1 byte )

For example

Code:

#use rtos(timer=0,minor_cycle=2ms)

Code:

#task(rate=500ms,max=2ms)
void The_first_rtos_task ( );

This will be work correctly.

Code:

#task(rate=1000ms,max=2ms)
void The_first_rtos_task ( );

This will not work correctly.

Is there any way to fix?

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