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Consultation on rate of rtos task execution

 
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Suky



Joined: 17 Jun 2009
Posts: 3

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Consultation on rate of rtos task execution
PostPosted: Wed Jun 17, 2009 8:23 pm     Reply with quote
The value given in this parameter, that indicates really? Since in a simple example I have made I set up a task to run every 2ms, it is the only task, but I check that runs every 1.7 ms. What can be the problem? Confused

The execution time of task is approximately 2us.

Code:
#include <18F2550.h>
#device adc=8

#fuses HSPLL,NOWDT,NOPROTECT,NOLVP,NODEBUG,USBDIV,PLL3,CPUDIV1,VREGEN

#use delay(clock=48000000)

#use rtos(timer=0,minor_cycle=1ms)
//******************************************************************************
#use fast_io(b)

#bit Led0=0xF81.0

#task(rate=2ms,max=5us)
void Tarea1(void);


void main(){
   set_tris_b(0x00);
   setup_adc_ports(NO_ANALOGS|VSS_VDD);
   setup_adc(ADC_OFF);
   setup_wdt(WDT_OFF);
   setup_comparator(NC_NC_NC_NC);
   setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
   Led0=0;
   
   rtos_run ();
}
void Tarea1(void){
   Led0=1;
   delay_us(2);
   Led0=0;
}


thanks!

PD:My English is bad Rolling Eyes
Suky



Joined: 17 Jun 2009
Posts: 3

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Re: Consultation on rate of rtos task execution
PostPosted: Sat Jun 20, 2009 10:15 am     Reply with quote
Nobody knows whether it should be so, or am I doing something wrong? Rolling Eyes
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sat Jun 20, 2009 12:08 pm     Reply with quote
Read this thread on RTOS execution rates:
http://www.ccsinfo.com/forum/viewtopic.php?t=29772
Suky



Joined: 17 Jun 2009
Posts: 3

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PostPosted: Sat Jun 20, 2009 1:49 pm     Reply with quote
PCM programmer wrote:
Read this thread on RTOS execution rates:
http://www.ccsinfo.com/forum/viewtopic.php?t=29772


Thank you for the tip

Best Wishes!
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