LPC1768 RTC interrupt per minutes issues

[krishna1]

Hi team,

i tried to generate an interrupt in LPC1768 RTC interrupt per minutes, but it is not generate the interrupt per minutes, it generates the per second. 

so please check the below code.

int rtc_initialize()

{

__set_PCONP(PCRTC, 1);     

RTC_CCR = ((1 << SBIT_CTRST) | (1 << SBIT_CCALEN));

RTC_CALIBRATION = 0x00;

RTC_CIIR = 0x0002;    // minutes interrupt

RTC_CCR = (1<<SBOIT_CLKEN);   // Enable clock

RTC_ILR |= (1<<RTCALF);     // enable counter interrupt

__set_irqn_priority(RTC_TRQn,22);

}

let me know for any clarification

Thanks

Krishna

[victorjimenez]

Hello Krishna,

I modified the example of the RTC provided in the LPCOpen 2_10 for the LPC1769 to toggle a led each minute with the RTC minutes interrupt and everything worked fine. Here is the main of my project.

/**
 * @brief     RTC interrupt handler
 * @return     Nothing
 */
void RTC_IRQHandler(void)
{
     /* Toggle heart beat LED for each second field change interrupt */
     if (Chip_RTC_GetIntPending(LPC_RTC, RTC_INT_COUNTER_INCREASE)) {
          /* Clear pending interrupt */
          Chip_RTC_ClearIntPending(LPC_RTC, RTC_INT_COUNTER_INCREASE);
          Board_LED_Toggle(0);
     }
}

/**
 * @brief     Main entry point
 * @return     Nothing
 */
int main(void)
{
     SystemCoreClockUpdate();
     Board_Init();
     Board_LED_Set(2, false);
     Chip_RTC_Init(LPC_RTC);

     /* Set the RTC to generate an interrupt on each minute */
     Chip_RTC_CntIncrIntConfig(LPC_RTC, RTC_AMR_CIIR_IMMIN, ENABLE);

     /* Clear interrupt pending */
     Chip_RTC_ClearIntPending(LPC_RTC, RTC_INT_COUNTER_INCREASE);

     /* Enable RTC interrupt in NVIC */
     NVIC_EnableIRQ((IRQn_Type) RTC_IRQn);

     /* Enable RTC (starts increase the tick counter and second counter register) */
     Chip_RTC_Enable(LPC_RTC, ENABLE);

     /* Loop forever */
     while (1)
     {
          __WFI();
     }
}
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Hope it helps!

Victor.

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