LPC1768 -- How to use RTC

The LPC internal RTC configuration is relatively simple, and its initialization method is as follows:

void RTC_Init( void )

{

   PCONP_bit.PCRTC = 1;        // Enable the peripheral clock for RTC

   if( RTCCCR_bit.CLKEN == 0 ) {

          RTCILR = 0;

          RTCAMR = 0xFF;         

          RTCCIIR = 0;

          RTCCCR = 0;

          RTC_Set_DefTime();

          RTC_Start();

    }

}

Get the time function, where you need to create an RTC structure to store time data.

typedef{

    INT8U u8_Second;

    INT8U u8_Minute;

    INT8U u8_Hour;

    INT8U u8_DayMonth;

    INT8U u8_DayWeek;

    INT16U u16_DayYear;

    INT8U u8_Month;

    INT16U u8_Year;

}

void RTC_Get_Time( RTC* pst_time )

{

    pst_time->u8_Year = RTCCTIME1_bit.YEAR - 2000;

    pst_time->u8_Month = RTCCTIME1_bit.MON;

    pst_time->u16_DayYear = RTCCTIME2_bit.DOY;

    pst_time->u8_DayWeek = RTCCTIME0_bit.DOW;

    pst_time->u8_DayMonth = RTCCTIME1_bit.DOM;

    pst_time->u8_Hour = RTCCTIME0_bit.HOUR;

    pst_time->u8_Minute = RTCCTIME0_bit.MIN;

    pst_time->u8_Second = RTCCTIME0_bit.SEC;

}

Also use this structure to initialize the time parameters

void RTC_Set_Time( RTC* pst_time )

{

    RTCSEC_bit.SEC = pst_time->u8_Second;

    RTCMIN_bit.MIN = pst_time->u8_Minute;

    RTCHOUR_bit.HOUR = pst_time->u8_Hour;

    RTCDOM_bit.DOM = pst_time->u8_DayMonth;

    RTCDOW_bit.DOW = pst_time->u8_DayWeek;

    RTCDOY_bit.DOY = pst_time->u16_DayYear;

    RTCMONTH_bit.MON = pst_time->u8_Month;

    RTCYEAR_bit.YEAR = pst_time->u8_Year + 2000;

}

The above three functions complete the RTC configuration.

void TestRTC(void)

{

   RTC_Get_Time( &GetRtc );

   static INT8U Second = 0;

   if( Second != GetRtc.u8_Second){

      Second = GetRtc.u8_Second;

   printf("Current data : %d-%d-%d\r\n",GetRtc.u8_Year+2000,GetRtc.u8_Month,GetRtc.u8_DayMonth);

      printf("Current Time : %d:%d:%d\r\n",GetRtc.u8_Hour,GetRtc.u8_Minute,GetRtc.u8_Second);

   }

}

Test results: Printed on the PC serial port monitoring software through the UART interface.

Current data : 2011-10-13

Current Time : 0:58:39

Current data : 2011-10-13

Current Time : 0:58:40

Current data : 2011-10-13

Current Time : 0:58:41

Current data : 2011-10-13

Current Time : 0:58:42

Current data : 2011-10-13

Current Time : 0:58:43

Current data : 2011-10-13

Current Time : 0:58:44

Current data : 2011-10-13

Current Time : 0:58:45

Current data : 2011-10-13

Current Time : 0:58:56