Bluetooth Alarm Clock

[soumil]

Hi,

I want to use nrf51 development board as a bluetooth alarm clock using internal RTC . How can I generate timestamps to determine current date and time. Can the timer library be used for this purpose?

[BHAGYESH]

Digital clock and calendar along with nrf51422 and nrf51822 RTC's setting. BHAGYESH D BHAVASAR

// Internal 32kHz RC
NRF_CLOCK->LFCLKSRC = CLOCK_LFCLKSRC_SRC_Xtal << CLOCK_LFCLKSRC_SRC_Pos;
// Start the 32 kHz clock, and wait for the start up to complete
NRF_CLOCK->EVENTS_LFCLKSTARTED = 0;
NRF_CLOCK->TASKS_LFCLKSTART = 1;
while(NRF_CLOCK->EVENTS_LFCLKSTARTED == 0);

// Configure the RTC to run at 1 second intervals, and make sure COMPARE0 generates an interrupt (this will be the wakeup source)
NRF_RTC0->PRESCALER = 0;
NRF_RTC0->EVTENSET = RTC_EVTEN_COMPARE0_Msk; 
NRF_RTC0->INTENSET = RTC_INTENSET_COMPARE0_Msk; 
// NORDIC: Count to 32767, and not 32768
NRF_RTC0->CC[0] = 1*32767;

NVIC_EnableIRQ(RTC0_IRQn);
// NORDIC: SET IRQ PRIORITY
NVIC_SetPriority(RTC0_IRQn, 0);

NRF_RTC0->TASKS_START = 1;

//--------------------------------------------------------------------------------------------------

void RTC0_IRQHandler(void)
{

	  // NORDIC: CLEAR TASK AS QUICKLY AS POSSIBLE
    NRF_RTC0->TASKS_CLEAR = 1;
    // This handler will be run after wakeup from system ON (RTC wakeup)
    if(NRF_RTC0->EVENTS_COMPARE[0])
    {
			  NRF_RTC0->EVENTS_COMPARE[0] = 0;
		info.tm_sec++;
   
		}
}
//--------------------------------------------------------------------------------------------------