Re: [ECOS] CYGNUM_HAL_RTC_PERIOD

[Andrew Lunn <andrew at lunn dot ch>]

On Wed, Feb 22, 2006 at 02:33:26PM +0530, vasantha.rajan wrote:
> 
> 
> On Tuesday 21 February 2006 15:09, you wrote:
> 
> Hi Dirk ,
> 
> Thanks for your reply......
> 
> In my previous mail I asked one more question.....but did'nt get reply.
> 
> I will give a test code....
> 
> int count =1;
> 
> void alarm_handler( cyg_handle_t alarm_handle, cyg_addrword_t data )
> {
>        printf("value of count:%d\n",count++);
>          cyg_flag_setbits(&flag,pattern);
>  }
> 
>  void counter_thread(cyg_addrword_t data)
>  {
>          while(1)
>          {
>          value = 0xfffffffe;
>          pattern = 1;
>          mode=CYG_FLAG_WAITMODE_OR ;
>          cyg_flag_maskbits(&flag,value);
> 
>          cyg_alarm_initialize( alarm_hdl, 100 + cyg_current_time(), 0 );
>          value=cyg_flag_wait(&flag,pattern,mode);
>          }
>  }
> 
>   void cyg_user_start()
>  {
>          sys_clk = cyg_real_time_clock();
>          cyg_clock_to_counter( sys_clk, &counter_hdl );
>           cyg_alarm_create( counter_hdl, alarm_handler,
>  (cyg_addrword_t)&index1,          &alarm_hdl, &alarm_obj );
>         cyg_thread_create(10, &counter_thread, 0 ,"counter_thread", stack,
>  STACKSIZE, &handle, &thread);
>          cyg_thread_resume(handle);
>  }
> 
>  1. I made  CYGNUM_HAL_RTC_DENOMINATOR to 100000, (so that my
>  clock will trigger for 10us) and in my code if i initialize my alarm to
> cyg_alarm_initialize( alarm_hdl, 100000 + cyg_current_time(), 0 ), my alarm
>  triggered for every 1 sec.
> 
>  If I reduce my value given to cyg_alarm_initialize() API to 10000 my alarm
> triggered for every 0.1 sec ie, my code
>  count value increments to 10 for every second and still if reduce my value
>  to 1000 count value increments to 100 for every second,but if I still
>  reduce my value to 100 ,I expected the count value should increment to
>  1000,but the count value increments upto some 350 approx.
> 
>  and if i still reduce my value to 10 or 1 my count only increments to 350
>  only...why I am not getting the linear increment?????????

Simple. The CPU is 100% busy handling all these interrupts.

        Andrew

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