Hi,
This may be a silly question but I'm trying to generate two timed interrupt events using only TIMER0 (the MCU is nrf51822). My code is:
#define TIMEOUT1 3000 //3s
#define TIMEOUT1 5000 //5s
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;
/* 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);
The irq handler function then is: {code} void TIMER0_IRQHandler(void) { if( (NRF_TIMER0->EVENTS_COMPARE[0] != 0) && (NRF_TIMER0->INTENSET | (TIMER_INTENSET_COMPARE0_Set << TIMER_INTENSET_COMPARE0_Msk))) { NRF_TIMER0->EVENTS_COMPARE[0] = 0; } if( (NRF_TIMER0->EVENTS_COMPARE[1] != 0) && (NRF_TIMER0->INTENSET | (TIMER_INTENSET_COMPARE0_Set << TIMER_INTENSET_COMPARE0_Msk))) { NRF_TIMER0->EVENTS_COMPARE[1] = 0; } } {/code}
When I run the code, I only see an interrupt when TIMEOUT1 is met. I've probably misunderstood how the timer mechanism works. One theory I have is because I use the SHORTS, the counter is reset to 0 so only the first timeout is triggered followed by a counter reset repeatedly. I tried to disable SHORTS but then I noticed that an interrupt is triggered quite unpredictably and with long pauses. So the question is: is it possible to have TIMER0 triggering two interrupts at different intervals? If so then what am I doing wrong?
To solve my problem I use now TIMER0 and TIMER1 which works fine.
