Two interrupt events on TIMER0

RE: Two interrupt events on TIMER0

kk — Wed, 16 Apr 2014 07:01:49 GMT

good!

RE: Two interrupt events on TIMER0

Bastiaan — Wed, 27 Nov 2013 13:32:48 GMT

If you are to use the COMPARE0, you should add that as well.

-H

RE: Two interrupt events on TIMER0

Guest — Wed, 27 Nov 2013 13:32:48 GMT

If you are to use the COMPARE0, you should add that as well.

-H

RE: Two interrupt events on TIMER0

Manlio — Wed, 27 Nov 2013 10:58:15 GMT

NRF_TIMER0->SHORTS = (TIMER_SHORTS_COMPARE1_CLEAR_Enabled << TIMER_SHORTS_COMPARE1_CLEAR_Pos);

Why only clear the COMPARE1? Do COMPARE0 need be cleared?

Do need add the code NRF_TIMER0->SHORTS = (TIMER_SHORTS_COMPARE0_CLEAR_Enabled << TIMER_SHORTS_COMPARE0_CLEAR_Pos); ?

RE: Two interrupt events on TIMER0

Håkon Alseth — Tue, 03 Sep 2013 06:47:57 GMT

Hi,

This is to be expected. If you want them to fire every time, do like this in your interrupt: if (NRF_TIMER0->EVENTS_COMPARE[0] != 0) { static uint32_t cc_0 = TIMEOUT1 * 1000; cc_0 += TIMEOUT1 * 1000; NRF_TIMER0->CC[0] = cc_0; }

And the same for CC[1].

BR Håkon

RE: Two interrupt events on TIMER0

Florin — Tue, 03 Sep 2013 06:35:34 GMT

Hmm, I'm afraid it still doesn't work... On the code above, try to change the timeouts to: #define TIMEOUT1 2000 //2s #define TIMEOUT2 10000 //10s

Timeout1 should fire every 2s and TIMEOUT2 every 10s. What I observed is that Timeout2 fires first followed by Timeout1 after 2s, followed by 8s of pause. The cycle then repeats. Is this expected?

Best, florin

RE: Two interrupt events on TIMER0

Florin — Mon, 02 Sep 2013 15:46:03 GMT

It works now, good catch.

Thanks! florin

RE: Two interrupt events on TIMER0

Håkon Alseth — Mon, 02 Sep 2013 12:45:13 GMT

Hi,

Tested your code, and it seems that you forgot to enable interrupt on COMPARE1. Here's my test code:


void init_timer(void)
{
    NRF_TIMER0->TASKS_STOP = 1;
    // Create an Event-Task shortcut to clear TIMER0 on COMPARE[0] event
    NRF_TIMER0->MODE        = TIMER_MODE_MODE_Timer;
    NRF_TIMER0->BITMODE     = (TIMER_BITMODE_BITMODE_24Bit << TIMER_BITMODE_BITMODE_Pos);
    NRF_TIMER0->PRESCALER   = 4;  // 1us resolution

    NRF_TIMER0->TASKS_CLEAR = 1;               // clear the task first to be usable for later
    NRF_TIMER0->CC[0] = TIMEOUT1 * 1000; //first timeout
    NRF_TIMER0->CC[1] = TIMEOUT2 * 1000;   //second timeout

    NRF_TIMER0->INTENSET    = TIMER_INTENSET_COMPARE0_Enabled << TIMER_INTENSET_COMPARE0_Pos;
    NRF_TIMER0->INTENSET    = TIMER_INTENSET_COMPARE1_Enabled << TIMER_INTENSET_COMPARE1_Pos;
    /* Create an Event-Task shortcut to clear TIMER0 on COMPARE[0] event. */
    NRF_TIMER0->SHORTS      = (TIMER_SHORTS_COMPARE1_CLEAR_Enabled << TIMER_SHORTS_COMPARE1_CLEAR_Pos);
    NRF_TIMER0->TASKS_START = 1;
}

int main(void)
{
    NVIC_EnableIRQ(TIMER0_IRQn);
    init_timer();
    while(1);
}

void TIMER0_IRQHandler(void) 
{
    if (NRF_TIMER0->EVENTS_COMPARE[0] != 0)
    {
        NRF_TIMER0->EVENTS_COMPARE[0] = 0;
    }
    if (NRF_TIMER0->EVENTS_COMPARE[1] != 0)
    {
        NRF_TIMER0->EVENTS_COMPARE[1] = 0;
    }
}

BR Håkon