lpc1768_RTC_Example1.c

#include <lpc17xx.h>    //Device specific header file 
#include "lcd.h"        // Explore Embedded LCD library

/* bit position of CCR register */
#define SBIT_CLKEN     0    /* RTC Clock Enable*/
#define SBIT_CTCRST    1    /* RTC Clock Reset */
#define SBIT_CCALEN    4    /* RTC Calibration counter enable */


int main()
{
    uint16_t year;
    uint8_t hour, min, sec, date, month;

    SystemInit();           //Clock and PLL configuration

    /* Setup/Map the controller pins for LCD operation 
               RS   RW   EN   D0   D1   D2   D3   D4    D5    D6    D7  (P_NC: Not Connected)*/
    LCD_SetUp(P2_0,P2_1,P2_2,P_NC,P_NC,P_NC,P_NC,P1_24,P1_25,P1_26,P1_27);

    /* Specify the LCD type(2x16) for initialization*/
    LCD_Init(2,16);    

    /* Disable RTC clock, reset clock, Enable RTC calibration */
    LPC_RTC->CCR = ((1 << SBIT_CTCRST ) | (1 << SBIT_CCALEN));
    LPC_RTC->CALIBRATION = 0x00;
    LPC_RTC->CCR = (1 << SBIT_CLKEN);    /* Enable the clock for RTC */

    /* Set Date and Time only once, comment these lines after setting the time and date */                                           
    // Set Date 14th Nov 2015 
    LPC_RTC->DOM    = 14;   // Update date value 
    LPC_RTC->MONTH  = 11;   // Update month value
    LPC_RTC->YEAR   = 2015; // Update year value

    // Set Time 10:40:25 AM 
    LPC_RTC->HOUR   = 10;   // Update hour value 
    LPC_RTC->MIN    = 40;   // Update min value
    LPC_RTC->SEC    = 25;   // Update sec value 


    while (1)
    {
        /* Read Time */
        hour = LPC_RTC->HOUR;
        min  = LPC_RTC->MIN; 
        sec  = LPC_RTC->SEC; 

        /* Read Date */
        date  = LPC_RTC->DOM;   
        month = LPC_RTC->MONTH;  
        year  = LPC_RTC->YEAR;   

        /* Display date and time on LCD */
        LCD_GoToLine(0);            /* Go to First line of 2x16 LCD */
        LCD_Printf("Time: %2d:%2d:%2d",hour,min,sec);
        LCD_GoToLine(1);            /* Go to Second line of 2x16 LCD */
        LCD_Printf("Date: %2d/%2d/%4u",date,month,year);   
    }   
}