Code execution time

RE: Code execution time

Sai Kiran — Wed, 12 Feb 2020 08:11:30 GMT

I am having the same issue. sdk_config.h file is configured properly. I do not understand how to start a dummy timer. Can you show some code regarding this?

RE: Code execution time

TAR CHAL — Wed, 04 Apr 2018 13:08:30 GMT

thanks, after timer start i have a value of 8 ticks for begining and 12 ticks for the end, 4 ticks to realize the cifer and 4ticks = 91us, i think that it's pretty good for a cortex m4f,

RE: Code execution time

Jørgen Holmefjord — Wed, 04 Apr 2018 12:51:44 GMT

Did you also create and start a "dummy timer", to make sure RTC is running? RTC will not start until a timer is created, even it you have set the config. The config is also needed to make sure the RTC is not stopped if the last timer is stopped, but by leaving the "dummy timer" running, you make sure this never happens anyway.

RE: Code execution time

TAR CHAL — Wed, 04 Apr 2018 12:42:10 GMT

yes you right, the RTC in the sdk config was disabled, but when i enabled it and rebuiled my app, still have the same problem!!!!!

RE: Code execution time

Jørgen Holmefjord — Wed, 04 Apr 2018 10:50:02 GMT

You need the RTC to be running in order to get values. Please make sure you set the SDK config macro described in this post, and start a "dummy timer" to make sure the RTC is started.

RE: Code execution time

TAR CHAL — Wed, 04 Apr 2018 09:45:24 GMT

Hi Jørgen,

Thanks for reply, i had exactly the same idea, i put app_timer_cnt_get() before and after my cifer funtion but in result i have "0".

i don't know why i have this result but it's seems like when i debug the code, the RTC don't count !!,

here a snippet code of my application

/*my cifer function */
static void skip_encrypt(void){
	uint32_t begin = 0;
	uint32_t end = 0;

	/*variables of the cifer function*/
    static BYTE Key[_SKIP32_KEY_LEN] = {1,5,16,18,50,47,54,42,32,47};
    DWORD encrypt = 15;
    DWORD invalue = 45;

    /*where i want to calculate code time */
    begin = app_timer_cnt_get();
	skip32_initWithKey(Key);
    skip32_encrypt(&encrypt,invalue);
    end = app_timer_cnt_get();
    NRF_LOG_INFO("result time in ticks = %d \n", app_timer_cnt_diff_compute(end,begin));
   }
/**
 * @brief Function for application main entry.
 */
int main(void)
{
	log_init();
	timers_init();
	skip_encrypt();
	ble_stack_init();
	.
	.
	.
	.
	.
	.
	
	advertising_init();
	advertising_start();



	//application_timers_start();
	// Enter main loop.
	for (;;) {
		if (NRF_LOG_PROCESS() == false) {
			power_manage();
		}
	}

}

Do you have any idea why i have 0 in output ?

just a remarque : when i put the first app_timer_cnt_get() just after timer_init(), and the second after advertising_start(), i have an output of "3"

Regards,

RE: Code execution time

Jørgen Holmefjord — Wed, 04 Apr 2018 09:26:06 GMT

Hi,

You can setup the application timer library, and use the functions app_timer_cnt_get before and after your function call, and app_timer_cnt_diff_compute at the end to compute the time spent by the function. Note that this will give you the value in ticks, and you will have to calculate the actual time if you need this. Also note that if any interrupts happens within the function, the time spent handling the interrupts will also be counted.

Best regards,
Jørgen