Timer0 interrupt only firing once on nRF52832 using nrfx sdk - how to re-enable in ISR?

RE: Timer0 interrupt only firing once on nRF52832 using nrfx sdk - how to re-enable in ISR?

Matt_V — Fri, 04 Apr 2025 08:53:42 GMT

I do need to do app-specific things in the ISR though (I've just left them out of the code I posted, for conciseness and confidentiality) .

The lines:
nrfx_timer_clear(&m_timer0);
nrfx_timer_enable(&m_timer0);
I only added these two lines when the ISR failed to work more than once initially - but this didn't help.

RE: Timer0 interrupt only firing once on nRF52832 using nrfx sdk - how to re-enable in ISR?

hmolesworth — Thu, 03 Apr 2025 18:44:39 GMT

SHORTS as set in the code above clears the timer on compare 0 and leaves it running so isr shouldn't redundantly clear or attempt to enable; if the isr is required simply do this:

static void timer0_event_handler(nrf_timer_event_t event_type, void * p_context)
{
   static uint32_t state = 0;

//   nrfx_timer_clear(&m_timer0);
//   nrfx_timer_enable(&m_timer0);
...
}

RE: Timer0 interrupt only firing once on nRF52832 using nrfx sdk - how to re-enable in ISR?

Matt_V — Thu, 03 Apr 2025 17:50:39 GMT

I need the ISR to perform an application specific action though. What's SHORTS, btw?

RE: Timer0 interrupt only firing once on nRF52832 using nrfx sdk - how to re-enable in ISR?

hmolesworth — Thu, 03 Apr 2025 17:47:58 GMT

Don't need the isr as the SHORTS handles the clear and leaves timer running, try getting rid of it:

    ret_code_t err_code = nrfx_timer_init(&m_timer0, &timer_cfg, NULL); <<==
    APP_ERROR_CHECK(err_code);

    nrfx_timer_extended_compare(&m_timer0,
                                NRF_TIMER_CC_CHANNEL0,
                                nrfx_timer_ms_to_ticks(&m_timer0,
                                                       TIMER0_INTERVAL),
                                NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK,
                                false);   <<==