app_timer problem... help me

[junny]

Hello. i useing keil v4, s110 softdevice, nrf51822 ek boards. I want to check my runtime. So i use under the app_timer

     app_timer_create(&m_heart_rate_timer_id, APP_TIMER_MODE_SINGLE_SHOT, timeOut);   
     app_timer_start(	m_heart_rate_timer_id, HEART_RATE_MEAS_INTERVAL, NULL);		
     app_timer_cnt_get(&time1);
	
	for(i=0; i<10000; i++){
	LEA_Keyschedule(rndkeys, key);		
    }
		
app_timer_cnt_get(&time2);	
app_timer_cnt_diff_compute(time2, time1,&time_diff);		
app_timer_stop_all();
app_timer_cnt_get(&time2);		
app_timer_cnt_diff_compute(time2, time1,&time_diff);		
app_timer_stop_all();

But if the under for loop 1000rounds,it has 1192us ( 12us each). And.. more than 10000rounds , it has 202738us( 20us each). More and more, it has more values each.

other compiler(like arduino sketch, visual studio) has same time. but keil v4 has other value. why it has other value. plz, helpme

[Jørgen Holmefjord]

Hi,

I tried using a simple nrf_delay_ms(1) inside the loop and it gave me the following result:

1000  rounds:  2125 (time1:    0, time2:  2125)
10000 rounds: 21025 (time1: 2150, time2: 23175)

Are you sure that the function inside your loop spends the same time each call?

Best regards,

Jørgen

[junny]

thank you for your answer. Can u tell me, how you check the time?

i think i have the interrupt problem. but your timer function method can check the time. plz tell me the hint