Timer Disturb Main Loop

Question

main.c 
 y_timer.c 
 y_timer.h 
 Hi,
I wanted to make the function that get timestamp like mills().
I made this code bellow.
It does'nt move well.
Main loop is unintentionally end, nrf52 is reset.
What brought this on? 
 Thanks, 
 //Code for getting timestamp
#include "y_timer.h"

#include "app_timer.h"
#include "stdint.h"

#define APP_TIMER_PRESCALER 0 /**< Value of the RTC1 PRESCALER register. */
#define APP_TIMER_OP_QUEUE_SIZE 4 /**< Size of timer operation queues. */

#define SENSOR_CONTACT_DETECTED_INTERVAL APP_TIMER_TICKS(1000, APP_TIMER_PRESCALER) /**< Sensor Contact Detected toggle interval (ticks). */

APP_TIMER_DEF(m_sensor_contact_timer_id);
static unsigned long ul_pasttime;

static void timer_timeout_handler(void * p_context)
{
 UNUSED_PARAMETER(p_context);
 ul_pasttime++;
}

void timers_init(void) //設定
{
 uint32_t err_code;
 ul_pasttime = 0;
	
 APP_TIMER_INIT(APP_TIMER_PRESCALER, APP_TIMER_OP_QUEUE_SIZE, false);
 err_code = app_timer_create(&m_sensor_contact_timer_id,
 APP_TIMER_MODE_REPEATED,
 timer_timeout_handler);
 APP_ERROR_CHECK(err_code);
}

void application_timers_start(void)
{
 uint32_t err_code;

 err_code = app_timer_start(m_sensor_contact_timer_id, SENSOR_CONTACT_DETECTED_INTERVAL, NULL);
 APP_ERROR_CHECK(err_code);
}
unsigned long millis(void){
	return ul_pasttime;
}



//Main.c
void Sub(){
 int i_data = Data_Load();
 unsigned long * ul_time = 0;
 get_ms(ul_time);
 printf("timestamp:%lu",*ul_time);
 printf("i_data = %d
",i_data);
}

int main(void) {
	

 device_init(); //Abridgement

 timers_init();
 application_timers_start();

 while(1){
	Sub();
	delay_ms(100);
 }
 
}

MartinBL · Accepted Answer

The app_timer library uses RTC1 as a timer and the Low Frequency 32.768kHz clock as the clock source. However, app_timer doesn't start the LF clock so this has to be done by you. A simple way to do it is like this: 
 NRF_CLOCK->TASKS_LFCLKSTART = 1;
while(NRF_CLOCK->EVENTS_LFCLKSTARTED != 1)
{
 ;
}

Timer Disturb Main Loop

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