Setting nrf_drv_timer into single shot mode

[Jarmo]

I would need to change a timer into single shot mode. My code is as follows:

static const nrf_drv_timer_t   m_timer = NRF_DRV_TIMER_INSTANCE(MY_SAMPLE_TIMER);
nrf_drv_timer_init(&m_timer, NULL, timerHandler)
nrf_drv_timer_extended_compare(
        &m_timer, ANALOGIN_TIMER_CHANNEL, ticks, NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK, true);
nrf_drv_timer_enable(&m_timer);

So, how can I change the timer to run in single shot mode? There's also app_timer system in your sdk, what is the difference compared to nrf_timer API?

[Stefan Birnir Sverrisson]

Hi Jarmo

To make a singleshot timer, I think you could just call nrf_drv_timer_compare function instead of nrf_drv_timer_extended_compare function.

The nrf_drv_timer uses TIMER peripheral which runs on 16MHz clock, it is relatively high current and accurate.

The app_timer library uses RTC peripheral timer in the background, which runs on 32kHz clock. It is low current but not so accurate.

[Jarmo]

It seems that using NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK | NRF_TIMER_SHORT_COMPARE0_STOP_MASK does the thing in the extended_compare function.