nRF51: is it possible to read the timer counter register?

RE: nRF51: is it possible to read the timer counter register?

Ankush — Wed, 06 Jul 2016 10:06:33 GMT

can any one tell me how to read counter register value of real time counter example of nrf51?

RE: nRF51: is it possible to read the timer counter register?

Susheel Nuguru — Sat, 13 Feb 2016 09:17:53 GMT

This is internal to peripheral so It should be not be more than one system clock cycle.

RE: nRF51: is it possible to read the timer counter register?

mstrouse — Fri, 12 Feb 2016 17:31:34 GMT

Thanks Aryan. Can you give me an idea of the delay (number of clock cycles) in "capturing" the counter?

Marshall.

RE: nRF51: is it possible to read the timer counter register?

Susheel Nuguru — Fri, 12 Feb 2016 08:10:25 GMT

RTC Counter you CAN read directly, You CANNOT read TIMER counter directly. You need to capture it into one compare register.

If you are using SDK timer driver

uint32_t captured_value = current_nrf_drv_timer_capture(instance, cc_channel);

If you are not using driver, then

NRF_TIMERX->TASKS_CAPTURE[channel_number] = 1;
uint32_t captured_value = NRF_TIMERx->CC[cc_channel];

@Note: Capturing into CC register means that previous values in those registers are lost. If your application is waiting for some events based on previous values, then your app will malfunction. Capture only into a free CC register.