Measuring time between events

[fab]

Hi all,

I am struggling measuring time between events. I thought to use the timer driver and the nrf_drv_timer_capture_get function. This is my test code:

const nrf_drv_timer_t timer2 = NRF_DRV_TIMER_INSTANCE(1);

...

int main(void) {

....

  nrf_drv_timer_config_t timer_cfg = NRF_DRV_TIMER_DEFAULT_CONFIG;
  timer_cfg.frequency = NRF_TIMER_FREQ_16MHz;
  timer_cfg.mode = NRF_TIMER_MODE_COUNTER;
  timer_cfg.bit_width = NRF_TIMER_BIT_WIDTH_32;
  err_code = nrf_drv_timer_init(&timer2, &timer_cfg, null_event_handler);
  APP_ERROR_CHECK(err_code);
  nrf_drv_timer_enable(&timer2);
  
   for (;;) {

    uint32_t current = nrf_drv_timer_capture_get(&timer2, NRF_TIMER_CC_CHANNEL0);
    NRF_LOG_INFO("Current %d", current);

    
    if (NRF_LOG_PROCESS() == false) {
      power_manage();
    }
  }
}

I expected to see the current value getting greater, instead it is always 0.

Why?

Thanks.

[FormerMember]

To read the current value of the timer, the function nrf_drv_timer_capture() should be used. 

nrf_drv_timer_capture() does the following:

1. TASKS_CAPTURE[channel number]: the current value of the timer is placed in CC[channel number]
2. Read  the value of CC[channel number]

 

nrf_drv_timer_capture_get() only reads the value in CC[channel number]

[1730143]

still 0